KEPCO KLP 300-8-1200, KLP 75-33-1200, KLP 600-4-1200, KLP 10-150-1.2K, KLP 20-120-1.2K User Manual

KEPCO®

THE POWER SUPPLIER™

MODEL

USER MANUAL

ORDER NO. REV. NO.

KEPCO, INC. ! 131-38 SANFORD AVENUE ! FLUSHING, NY. 11355 U.S.A. ! TEL [phone] ! FAX [phone]

email: [e-mail] ! World Wide Web: http://www.kepcopower.com

KEPCO INC.

An ISO 9001 Company.

KLP SERIES

POWER SUPPLY

1200 WATT PROGRAMMABLE POWER SUPPLY

KLP SERIES

POWER SUPPLY

©2010, KEPCO, INC
P/N 243-1248-d1

IMPORTANT NOTES:

1) This manual is valid for the following Model and associated serial numbers:

MODEL SERIAL NO. REV. NO. MODEL SERIAL NO. REV. NO.
KLP 10-150-1200 REV.1 KLP 10-150-1.2K REV.1
KLP 20-120-1200 REV.12 KLP 20-120-1.2K REV.1
KLP 36-60-1200 REV.12 KLP 36-60-1.2K REV.1
KLP 75-33-1200 REV.25 KLP 75-33-1.2K REV.1
KLP 150-16-1200 REV.22 KLP 150-16-1.2K REV.1
KLP 300-8-1200 REV.14 KLP 300-8-1.2K REV.1
KLP 600-4-1200 REV.3 KLP 600-4-1.2K REV.1

2) A Change Page may be included at the end of the manual. All applicable changes and
revision number changes are documented with reference to the equipment serial num­bers. Before using this Instruction Manual, check your equipment serial number to identify
your model. If in doubt, contact your nearest Kepco Representative, or the Kepco Docu­mentation Office in New York, [phone], requesting the correct revision for your
particular model and serial number.

3) The contents of this manual are protected by copyright. Reproduction of any part can be
made only with the specific written permission of Kepco, Inc.

Data subject to change without notice.

228-1348 DC-COMP/INST 031308 A

Declaration of Conformity

Application of Council directives:

73/23/EEC (LVD)
93/68/EEC (CE mark)

Standard to which Conformity is declared:

EN61010-1:2001 (Safety requirements for electrical equipment for measurement,

control and laboratory use - Part 1)

Manufacturer's Name and Address:

KEPCO INC.
131-38 SANFORD AVENUE
FLUSHING, N.Y. 11352 USA

Importer's Name and Address:

Type of Equipment:

Component Power Supply

Model No.:

[PRODUCT MODEL NUMBER]

Year of Manufacture:

I, the undersigned, declare that the product specified above, when used in conjunction with the condi­tions of conformance set forth in the product instruction manual, complies with the requirements of the
Low Voltage Directive 73/23/EEC, which forms the basis for application of the CE Mark to this product.

Place: KEPCO Inc.

131-38 Sanford Ave.
Flushing, N.Y.11352 USA

Date:

Saul Kupferberg

(Full Name)

VP OF SALES

(position)

R

E

P

R

E

S

E

N

T

A

T

I

V

E

C

O

P

Y

B 228-1351 COND/CONFORM 031308

Conditions of Conformance

When this product is used in applications governed by the requirements of the EEC, the following restric­tions and conditions apply:

1. For European applications, requiring compliance to the Low Voltage Directive, 73/23/EEC, this power
supply is considered a component product, designed for "built in“ applications. Because it is incom­plete in construction, the end product enclosure must provide for compliance to any remaining electri­cal safety requirements and act as a fire enclosure. (EN61010-1:2001, Cl. 6, Cl. 7, Cl.8, and Cl. 9)

2. This power supply is designed for stationary installation, with mains power applied via a detachable
power supply cord or via direct wiring to the source power terminal block.

3. This power supply is considered a Class 1 (earthed) product. It is intended for use as part of equip­ment meant for test, measurement and laboratory use, and is designed to operate from single phase,
three wire power systems. This equipment must be installed within a suitably wired equipment rack,
utilizing a three wire (grounded) mains connection. See wiring section of this manual for complete
electrical wiring instructions. (EN61010-1:2001, Cl.6.10.1)

4. This power supply has secondary output circuits that are considered hazardous, and which exceed
240 VA at a potential of 2V or more.

5. The output wiring terminals of this power supply has not been evaluated for field wiring and, therefore,
must be properly configured by the end product manufacturer prior to use.

6. This power supply employs a supplementary circuit protector in the form of a circuit breaker mounted
on the front panel. This circuit breaker protects the power supply itself from damage in the event of a
fault condition. For complete circuit protection of the end product, as well as the building wiring, it is
required that a primary circuit protection device be fitted to the branch circuit wiring. (EN61010-1:2001,
Cl. 9.5)

7. Hazardous voltages are present within this power supply during normal operation. All operator adjust­ments to the product are made via externally accessible switches, controls and signal lines as speci­fied within the product operating instructions. There are no user or operator serviceable parts within
the product enclosure. Refer all servicing to qualified and trained Kepco service technicians.

228-1353 SAFETY - (SWITCH) 031308 C/(D BLANK)

SAFETY INSTRUCTIONS

1. Installation, Operation and Service Precautions

This product is designed for use in accordance with EN 61010-1 and UL 3101 for Installation Category 2,
Pollution Degree 2. Hazardous voltages are present within this product during normal operation. The prod­uct should never be operated with the cover removed unless equivalent protection of the operator from
accidental contact with hazardous internal voltages is provided:

2. Grounding

This product is a Class 1 device which utilizes protective earthing to ensure operator safety.

3. Electric Shock Hazards

This product outputs hazardous voltage and energy levels as a function of normal operation. Operators
must be trained in its use and exercise caution as well as common sense during use to prevent accidental
shock.

There are no operator serviceable parts or adjustments within the product enclosure.
Refer all servicing to trained service technician.

Source power must be removed from the product prior to performing any servicing.

The PROTECTIVE EARTHING CONDUCTOR TERMINAL must be properly con­nected prior to application of source power to the product (see instructions on instal­lation herein) in order to ensure safety from electric shock.

PROTECTIVE EARTHING CONDUCTOR TERMINAL - This symbol indicates the
point on the product to which the protective earthing conductor must be attached.

EARTH (GROUND) TERMINAL - This symbol is used to indicate a point which is
connected to the PROTECTIVE EARTHING TERMINAL. The component installer/
assembler must ensure that this point is connected to the PROTECTIVE EARTH­ING TERMINAL.

CHASSIS TERMINAL -This symbol indicates frame (chassis) connection, which is
supplied as a point of convenience for performance purposes (see instructions on
grounding herein). This is not to be confused with the protective earthing point, and
may not be used in place of it.

This symbol appears adjacent to any external terminals at which hazardous voltage
levels as high as 600V d-c may exist in the course of normal or single fault condi­tions.

This symbol appears adjacent to any external terminals at which hazardous voltage
levels in excess of 600V d-c may exist in the course of normal or single fault condi­tions

!

!

!

!

KLP SVC 020498 i

TABLE OF CONTENTS

SECTION PAGE

SECTION 1 - INTRODUCTION

1.1 Scope of Manual......................................................................................................................................... 1-1

1.2 General Description .................................................................................................................................... 1-1

1.3 Specifications.............................................................................................................................................. 1-1

1.4 Features...................................................................................................................................................... 1-8

1.4.1 Local Control ........................................................................................................................................... 1-8

1.4.2 Remote Control ....................................................................................................................................... 1-8

1.4.2.1 Digital Programming ........................................................................................................................... 1-8

1.4.2.2 Analog Programming ......................................................................................................................... 1-8

1.4.3 Digital Calibration .................................................................................................................................... 1-8

1.4.4 Overvoltage/Overcurrent Protection........................................................................................................ 1-9

1.4.5 User-defined Voltage/Current Limits (Virtual Models) ............................................................................. 1-9

1.4.6 Storage of User-Programmed Active Settings ........................................................................................ 1-9

1.4.7 User-Programmed Sequences................................................................................................................ 1-9

1.4.8 Last Setting Recall .................................................................................................................................. 1-9

1.4.9 Built-in Protection .................................................................................................................................... 1-9

1.4.10 Internal Relay .......................................................................................................................................... 1-10

1.4.11 Master/Slave Control [-1200 Models Only].............................................................................................. 1-10

1.5 Equipment Supplied.................................................................................................................................... 1-10

1.6 Accessories ................................................................................................................................................ 1-10

1.7 Safety.......................................................................................................................................................... 1-10

SECTION 2 - INSTALLATION

2.1 Unpacking and Inspection .......................................................................................................................... 2-1

2.2 Terminations and Controls.......................................................................................................................... 2-1

2.2.1 Front Panel Controls and Indicators. ....................................................................................................... 2-1

2.2.2 Rear Panel Connectors and Switches..................................................................................................... 2-1

2.3 Source Power Requirements...................................................................................................................... 2-6

2.4 Cooling........................................................................................................................................................ 2-6

2.5 Preliminary Operational Check ................................................................................................................... 2-6

2.6 Installation................................................................................................................................................... 2-7

2.6.1 Rack Mounting ........................................................................................................................................ 2-7

2.7 Wiring Instructions ...................................................................................................................................... 2-7

2.7.1 Safety Grounding .................................................................................................................................... 2-8

2.7.2 Source Power.......................................................................................................................................... 2-8

2.7.2.1 Current Rating .................................................................................................................................... 2-8

2.7.2.2 Connections ....................................................................................................................................... 2-8

2.7.3 D-C Output Grounding ............................................................................................................................ 2-9

2.7.4 Power Supply/Load Interface .................................................................................................................. 2-10

2.7.5 Load Connection - General ..................................................................................................................... 2-10

2.7.5.1 Local Sensing/Remote Sensing Select .............................................................................................. 2-10

2.7.6 Series Operation ..................................................................................................................................... 2-11

2.7.7 Parallel/redundant Operation .................................................................................................................. 2-11

2.7.7.1 Load Sharing ...................................................................................................................................... 2-13

2.7.8 Master/Slave Configurations [-1200 Models Only] .................................................................................. 2-13

2.7.9 Analog I/O Connections .......................................................................................................................... 2-14

2.8 Digital Connections..................................................................................................................................... 2-14

2.8.1 GPIB Connections................................................................................................................................... 2-14

2.8.2 RS 232 Connections [-1200 Models Only] .............................................................................................. 2-15

2.8.3 LAN Connections [-1.2K Models Only].................................................................................................... 2-15

SECTION 3 - OPERATION

3.1 General ....................................................................................................................................................... 3-1

3.2 Local Mode Operation ................................................................................................................................ 3-1

3.2.1 Turning the Power Supply On ................................................................................................................. 3-1

3.2.2 Setting Local/Remote Mode .................................................................................................................... 3-3

3.2.2.1 Remote with Local (Front Panel) Lockout .......................................................................................... 3-3

ii KLP SVC 031308

TABLE OF CONTENTS

SECTION PAGE

3.2.3 Enabling/Disabling Output Power........................................................................................................... 3-4

3.2.4 Checking Voltage/Current Setpoints....................................................................................................... 3-4

3.2.5 Password Protected Functions............................................................................................................... 3-4

3.2.6 Defining a Virtual Model.......................................................................................................................... 3-5

3.2.7 Setting voltage or current........................................................................................................................ 3-6

3.2.7.1 Real-time Voltage/Current Adjustment .............................................................................................. 3-6

3.2.7.2 Setpoint Adjustment .......................................................................................................................... 3-6

3.2.7.3 Last Setting Recall............................................................................................................................. 3-7

3.2.8 Viewing/Changing Overvoltage or Overcurrent Protection Values ......................................................... 3-7

3.2.9 Changing GPIB Address......................................................................................................................... 3-8

3.2.10 Changing RS232 Baud Rate [-1200 Models Only] ................................................................................. 3-8

3.2.11 Setting up Master/Slave Configurations [-1200 Models Only] ................................................................ 3-8

3.2.11.1 Configure power supply as Master [-1200 Models Only]................................................................... 3-9

3.2.11.2 Configure power supply as Slave [-1200 Models Only]..................................................................... 3-9

3.2.11.3 Operating the Master/Slave Configuration [-1200 Models Only] ....................................................... 3-10

3.2.12 LAN Interface Configuration [-1.2K Models Only]................................................................................... 3-11

3.2.13 Utility Function ........................................................................................................................................ 3-12

3.2.13.1 Display System Firmware Version..................................................................................................... 3-13

3.2.13.2 Display Model .................................................................................................................................... 3-13

3.2.13.3 Internal Relay Control........................................................................................................................ 3-13

3.2.13.4 Quick Boot ......................................................................................................................................... 3-15

3.2.13.5 System Configuration Functions........................................................................................................ 3-15

3.2.13.5.1 Remote Inhibit Configuration ....................................................................................................... 3-15

3.2.13.5.2 Fault Recovery Configuration ...................................................................................................... 3-16

3.2.13.6 Analog Input Full Scale Calibration ................................................................................................... 3-17

3.2.13.7 Calibration ......................................................................................................................................... 3-18

3.3 Remote Mode Programming Using Digital Interfaces ................................................................................ 3-18

3.3.1 Factory Default Settings ......................................................................................................................... 3-18

3.3.1.1 GPIB Factory Defaults ....................................................................................................................... 3-18

3.3.1.2 RS 232 Factory Defaults [-1200 Models Only] .................................................................................. 3-18

3.3.1.3 LAN Factory Defaults [-1.2K Models Only]........................................................................................ 3-18

3.3.2 Additional Functions Not Available from the Front Panel ....................................................................... 3-19

3.3.3 Remote Programming Using the IVI-COM Instrument Driver................................................................. 3-19

3.3.4 Remote Programming Using the LabView G Instrument Driver ............................................................. 3-19

3.3.5 Remote Programming Using the VXI plug&play Instrument Driver ........................................................ 3-19

3.3.6 Remote Programming Using the Web Interface [-1.2K Models Only] .................................................... 3-19

3.3.6.1 Finding Kepco Power Supplies on the LAN [-1.2K Models Only] ...................................................... 3-20

3.3.6.2 Launch Web Interface [-1.2K Models Only]....................................................................................... 3-21

3.3.6.3 Instrument Configuration Using Web Interface [-1.2K Models Only] ................................................. 3-22

3.3.6.4 LAN Configuration Using Web Interface [-1.2K Models Only]........................................................... 3-23

3.3.6.5 Operating The Unit Using Web Interface [-1.2K Models Only].......................................................... 3-24

3.3.6.5.1 Changing the Output [-1.2K Models Only]................................................................................... 3-25

3.3.6.5.2 Changing Protection [-1.2K Models Only] ................................................................................... 3-25

3.3.6.5.3 Using Save and Recall [-1.2K Models Only] ............................................................................... 3-25

3.3.6.5.4 Resetting the Unit (*RST) [-1.2K Models Only] ........................................................................... 3-27

3.3.6.5.5 Using a List (User-Programmed Sequences) [-1.2K Models Only] ............................................. 3-27

3.3.6.5.6 Setting Virtual Model [-1.2K Models Only]................................................................................... 3-28

3.4 Remote Programming Using Analog Signals............................................................................................. 3-29

3.4.1 Enabling/Disabling the Output using Analog Control.............................................................................. 3-29

3.4.2 Programming with external resistance.................................................................................................... 3-30

3.4.3 Programming with external Voltage........................................................................................................ 3-31

3.4.4 Changing Overvoltage or Overcurrent Protection Values in Analog Programming Mode ...................... 3-32

KLP SVC 020498 iii

TABLE OF CONTENTS

SECTION PAGE

SECTION 4 - CALIBRATION

4.1 General ....................................................................................................................................................... 4-1

4.2 Equipment Required ................................................................................................................................... 4-1

4.3 Calibration Using Front Panel Controls in Local Mode ............................................................................... 4-2

4.3.1 Voltage Calibration (Local) ...................................................................................................................... 4-2

4.3.2 Current Calibration (Local) ...................................................................................................................... 4-3

4.3.3 External Calibration (Local) ..................................................................................................................... 4-3

4.3.4 Calibration Exit (Local) ............................................................................................................................ 4-4

4.4 Calibration using VXI plug&play Driver....................................................................................................... 4-4

4.4.1 Voltage Calibration (VXI plug&play Driver Demo)................................................................................... 4-6

4.4.2 Current Calibration (VXI plug&play Demo).............................................................................................. 4-7

4.4.3 Analog Reference Calibration (VXI plug&play Demo) ............................................................................. 4-8

4.4.4 Calibration Exit (VXI plug&play Demo).................................................................................................... 4-9

4.5 Changing the Calibration Password ........................................................................................................... 4-9

4.6 Restoring Prior Calibration Values.............................................................................................................. 4-10

KLP INSTALLATION/OPERATION SUMMARY

LIST OF FIGURES

FIGURE TITLE PAGE

iv KLPSVC 031308

1-1 KLP Series Power Supply ............................................................................................................................. vi

1-2 KLP Operating Regions.............................................................................................................................. 1-2

1-3 KLP Series Power Supply, Mechanical Outline Drawing ........................................................................... 1-6

2-1 KLP Series, Front Panel Controls and Indicators ....................................................................................... 2-1

2-2 KLP Series, Rear Panel Switch and Connectors ....................................................................................... 2-3

2-3 Remote Sensing......................................................................................................................................... 2-11

2-4 Series Connection using Remote Sensing................................................................................................. 2-12

2-5 Parallel Connections Using Remote Sensing............................................................................................. 2-12

3-1 Fault Recovery Configuration Display ........................................................................................................ 3-17

3-2 PS FIND Screen......................................................................................................................................... 3-20

3-3 Setting a Static IP Address......................................................................................................................... 3-21

3-4 Web Interface Home Page (Unit Description) ............................................................................................ 3-21

3-5 Web Interface Configure Instrument Page ................................................................................................. 3-22

3-6 Web Interface Configure LAN Page ........................................................................................................... 3-24

3-7 Web Interface Operate Instrument Page.................................................................................................... 3-25

3-8 Protection Dialog Box................................................................................................................................. 3-25

3-9 Save/Recall Dialog Box.............................................................................................................................. 3-26

3-10 Reset Dialog Box........................................................................................................................................ 3-27

3-11 List Dialog Box ........................................................................................................................................... 3-27

3-12 Adding Multiple Steps (Ramps) to List ....................................................................................................... 3-28

3-13 Virtual Model Dialog Box ............................................................................................................................ 3-29

3-14 Analog Programming of Output Voltage or

Current using Resistance ....................................................................................................................... 3-30

3-15 Analog Programming of Output Voltage or Current using Voltage............................................................. 3-31

4-1 Calibration Window .................................................................................................................................... 4-5

4-2 Voltage Calibration Window ....................................................................................................................... 4-6

4-3 Current Calibration Window ....................................................................................................................... 4-7

4-4 Analog Reference Calibration Window....................................................................................................... 4-8

KLP SVC 020498 v

LIST OF TABLES

TABLE TITLE PAGE

1-1 Model Parameters .......................................................................................................................................1-2

1-2 KLP Specifications ......................................................................................................................................1-3

1-3 Equipment Supplied ....................................................................................................................................1-10

1-4 Accessories .................................................................................................................................................1-11

1-5 Safety Symbols ...........................................................................................................................................1-11

2-1 Controls, and Indicators ..............................................................................................................................2-1

2-2 Analog I/O Switch Functions .......................................................................................................................2-2

2-3 IEEE 488 Port Connector (J4) Pin Assignments .........................................................................................2-4

2-4 RS232 Port Connector (J3) Pin Assignments [-1200 Models Only] ............................................................2-4

2-5 LAN Port Connector (J7) Pin Assignments [-1.2K Models Only] ................................................................2-5

2-6 Control Input Terminal block Assignments ..................................................................................................2-5

2-7 Analog I/O Connector (J2) Pin Assignments ..............................................................................................2-5

2-8 Input Current Service Rating and Conductor Sizes ....................................................................................2-8

3-1 Power-up Built-in Test Error Codes ............................................................................................................3-2

4-1 Factory Default Unit Passwords ..................................................................................................................4-10

vi KLP031308

FIGURE 1-1. KLP SERIES POWER SUPPLY

KLP 031308 1-1

SECTION 1 - INTRODUCTION

1.1 SCOPE OF MANUAL

This manual contains instructions for the installation, operation and service of the KLP series of
1200W output power, stabilized voltage or current, d-c power supplies manufactured by
KEPCO, Inc., Flushing, New York, U.S.A.

WARNING

DANGEROUS AND LETHAL POTENTIALS ARE PRESENT,
BOTH WITHIN THIS POWER SUPPLY, AND AT THE OUTPUT!

Before proceeding to use the power supply, read this manual very care­fully. Caution must be used when working with, and making connections
to, this power supply. Use only wires with the proper voltage rating for
high voltage connections.

1.2 GENERAL DESCRIPTION

The KLP Power Supply Series (Figure 1-1) are universal input, automatic crossover, 1200-watt
constant power, voltage/current stabilizers with a full rectangular output characteristic within the
voltage and current ranges listed in Table 1-1.

Six KLP -1200 Models and six KLP -1.2K Models are available, as listed in Table 1-1. The -1200
Models are GPIB and RS 232 compatible; the KLP -1.2K Models are GPIB and LAN compatible.
All models allow remote analog programming.

For each model a multitude of virtual models can be configured. The “rated voltage, maximum
current at rated voltage” and “rated current and maximum voltage at rated current” parameters
define the virtual models available within the limit of 1200 Watts of output power (see Figure 1-

2).

KLP power supplies operate from wide range 100-255V a-c, 45-66 Hz or 125-420V d-c input
source power. Since there are no internal adjustments, KLP Power Supplies offer excellent out­put voltage/current stability and easy calibration.

Output voltage and current are displayed on independent LED displays. Control of the KLP can
be either local, via the front panel controls and displays, or remote, using 1) either analog sig­nals (applied to the Analog I/O Port), or 2) digital programming via either a) IEEE 488.2 (GPIB)
bus, b) RS 232 communication bus [-1200 Models only]. The -1.2K Models also offer direct or
web page control via the LAN port. Digital control is done with 12 bits of resolution over the
entire voltage/current range.

The full-rack cross section permits mounting in a standard 19-inch wide rack (for optional chas­sis slides); see Table 1-4. Load connections are made at the rear panel. Sensing, monitor, and
current share terminals are also available at the rear panel. Outline dimensions are provided in
Figure 1-3.

1.3 SPECIFICATIONS

Table 1-1 lists the parameters applicable to individual models. Table 1-2 lists general specifica­tions applicable to all models except where otherwise noted.

1-2 KLP 031308

FIGURE 1-2. KLP OPERATING REGIONS

TABLE 1-1. MODEL PARAMETERS

Model number

Rated

Vol tag e

Range

(1)

Maximum

current for

rated voltage

Minimum

programmable

current

Rated

Current

Range

(1)

Maximum

voltage for

rated current

Ripple and

noise
p-p

(2)

Efficiency

@115 Va-c

KLP 10-150-

(3)

0-10V 120A@10V 3.2A 0-150A 8V@150A 75 mV 80%

KLP 20-120-

(3)

0-20V 60A@20V 1.6A 0-120A 10V@120A 75 mV 82%

KLP 36-60-

(3)

0-36V 33.3A@36V 0.8A 0-60A 20V@60A 125 mV 83%

KLP 75-33-

(3)

0-75V 16A@75V 0.4A 0-33.3A 36V@33.3A 125 mV 84%

KLP 150-16-

(3)

0-150V 8A@150V 0.2A 0-16A 75V@16A 125 mV 86%

KLP 300-8-

(3)

0-300V 4A@300V 0.1A 0-8A 150V@8A 300 mV 87%

KLP 600-4-

(3)

0-600V 2A@600V 0.05A 0-4A 300V@4A 400 mV 88%

(1) The maximum current and voltage are constrained by the 1200 watt power limitation, see Figure 1-2.
(2) Bandwidth: 20MHz; low frequency ripple may be higher at loads less than 30 Watts.
(3) Specifications listed apply to both -1200 and -1.2K Models.

KLP 031308 1-3

TABLE 1-2. KLP SPECIFICATIONS

SPECIFICATION RATING/DESCRIPTION CONDITION/COMMENT

INPUT CHARACTERISTICS

a-c voltage

nominal 110-240 Va-c Single Phase.

range 100-255 Va-c Wide Range; contact factory for opera-

tion to 265V a-c.

d-c voltage range 125-420 Vd-c No regulatory agency approval.

Frequency

nominal range 50-60 Hz

maximum 45-440 Hz Increased Leakage above 66 Hz.

Power Factor typical 0.99 Meets EN 61000-3-2.

Maximum Input Current 120 Va-c 13A rms Rated load (1200W).

240 Va-c 6.5A rms Rated load (1200W).

Inrush Current

265 Va-c 40A Peak

132 Va-c 20A Peak

Input Fusing Circuit Breaker 2-line

Low a-c Protection Self protected No fixed limits.

Output hold up typical 10 milliseconds Ride through.

Leakage Current 115 Va-c, 60Hz 5mA max

230 Va-c 50Hz 10mA max

OUTPUT CHARACTERISTICS

Type of stabilizer CV/CC Voltage/Current

Adjustment range voltage 0-100% of rated voltage No minimum load required.

current mininimum to 100% of rated current No minimum load required. See Table

1-1 for minimum programmable current.

Source effect voltage 0.01% E

max

Over full source range.

current 0.01% I

max

Load effect voltage 0.01% E

max

Over full load current range.

current 0.02% Imax

Temperature effect voltage 0.02%/deg C 0-50 deg C

current 0.05%/deg C

Time effect (drift) voltage 0.05%/24hr After 30 min warmup.

current 0.05%/24hr

Error sensing 0.25 volts per wire Above rated output. Contact factory for

larger margins.

Isolation voltage 600 Vd-c or peak Either output terminal to ground.

Transient recovery
for load change

excursion 1% of E

max

50% load step 2A/microsecond max.

recovery 2 msec Return to 0.1% of setting.

Turnon/turnoff overshoot same as load transient response limits

Overvoltage protection voltage 20-120% of E

max

Programmable; see PAR. 3.2.13.5.2.

Overcurrent protection current 72-120% of I

max

Programmable; see PAR. 3.2.13.5.2.

Overtemperature protection Shutdown See PAR. 3.2.13.5.2.

Open Load wire protection Shutdown See PAR. 3.2.13.5.2.

Parallel operation Active load sharing within 5% of Io rated Up to 5 units, maximum.

1-4 KLP 031308

GENERAL (ENVIRONMENTAL) SPECIFICATIONS

Temperature operating -20 to +50 deg C Rated load. Derate at 25W per °C

between 50 and 70°C.

storage -40 to +85 deg C

Cooling 3 internal d-c fans exhaust to the rear

Humidity 0 to 95% RH non-condensing

Shock 20g, 11msec +/- 50% half sine non-operating

Vibration 5 -10 Hz 10mm double amplitude 3-axes, non-operating

10-55 Hz 2g 3-axes, non-operating

Altitude sea level to 10000 ft. 0-3,000 ft: 100%, linear derating to 70%

of power at 10,000ft.

PHYSICAL CHARACTERISTICS

Dimensions English 1.735”H x 19"W x 17.5"D Depth excluding connectors and termi-

nal blocks (see Figure 1-3).

metric 44.45 x 482.6 x 443.7 mm

Weight English 15 lbs

metric 6.82kg

Source power connector IEC 320-C19 appliance inlet 250 Va-c, 16A (VDE);

125V a-c, 20A (UL)

Load connections 8-36V models Nickel plated copper busbars Provision for safety covers.

75-600V models Shocksafe Euroblock

Analog programming port. 15 pin D-sub

Digital programming ports primary Standard GPIB connector IEEE 488.2 (GPIB)

secondary 9 pin D-sub RS 232 (-1200 Models only)

secondary RJ 45 LAN (-1.2K Models Only)

Feedback/Control Input 5 position low profile Euroblocks

PROGRAMMING CHARACTERISTICS - LOCAL

Local control rotary encoders Panel mounted.

Local control resolution Coarse ~100 LSB/step Depress control for Fine resolution

Fine 1 LSB/step

Setting range 0-100% of rating KLP will automatically adjust limit to

maintain 1200 W maximum,

Power up settings voltage defaults to zero See PAR. 3.2.7.3.

current defaults to min. value (See Table 1-1)

Protection Limits Overvoltage 20-120% of Emax Programmable; accessed via front

panel protect switch or SCPI command
over digital bus.

Overcurrent 72-120% of Imax

TABLE 1-2. KLP SPECIFICATIONS (Continued)

SPECIFICATION RATING/DESCRIPTION CONDITION/COMMENT

KLP 031308 1-5

PROGRAMMING CHARACTERISTICS - ANALOG

Analog remote control selection Activate with jumper at analog program-

ming connector

Recognized during power up.

isolation Safety Extra Low Voltage (SELV)

Analog Input Update Rate 2Hz (0.5 Second) Applies to program-

ming by voltage/ resistance and read­back specifications.

Analog input voltage digitized (12-bit
resolution), optically isolated, then pro­cessed by digital section.

Programming by voltage voltage 0-10V See PAR. 4.3.3 to reduce Full Scale

voltage.

current 0-10V Min. programming limit; see Table 1-1.

See PAR. 4.3.3 to reduce Full Scale
voltage.

Programming by resistance voltage 0-10K ohms See PAR. 4.3.3 to reduce Full Scale

resistance.

current 0-10K ohms Min. programming limit; see Table 1-1.

See PAR. 4.3.3 to reduce Full Scale
resistance.

Readback 0-10V proportional signal Proportional to analog control volt-

age/resistance.

Remote inhibit TTL compatible Dual polarity; see PAR. 3.2.13.5.1.

Composite status flag Isolated form C contacts Programmable functions (PAR.

3.2.13.3).

PROGRAMMING CHARACTERISTICS - DIGITAL

Supported Interfaces -1200 Models GPIB and RS 232 SCPI command set for GPIB and RS

232 (see KLP Developer’s Guide).

-1.2K Models GPIB and LAN Support SCPI command set (see KLP
Developer’s Guide) for GPIB and LAN;
Support four interfaces for LAN:

1. Web interface, port 80 (LXI Class C,
Version 1.2

2. SCPI Telnet, port 5024

3. SCPI Sockets, port 5025

4. VXI 11, port 1024

GPIB GPIB address range: 1 to 31 Factory default is 6.

RS 232 -1200 Models Baud Rate range: 2400, 4800, 9600,

19,200 or 38,400

Factory default is 38,400.

Digital remote control isolation Safety Extra Low Voltage (SELV)

format compatible with SCPI protocols W98 SE and later operating systems.

Programming resolution 0.024% of Emax and Imax

Programming accuracy 0.05% of Emax and Imax

Readback resolution 0.024% of Emax and Imax

Readback accuracy 0.1% of Emax and Imax

Status reporting OVP, OCP, OTP, output lead fault

(OLF), fan failure, power loss

See PAR. 1.4.4 and 1.4.9.

TABLE 1-2. KLP SPECIFICATIONS (Continued)

SPECIFICATION RATING/DESCRIPTION CONDITION/COMMENT

1-6 KLP 031308

FIGURE 1-3. KLP SERIES POWER SUPPLY, MECHANICAL OUTLINE DRAWING (SHEET 1 OF 2)

R\DWG\MECH\3010266

KLP 031308 1-7

FIGURE 1-3. KLP SERIES POWER SUPPLY, MECHANICAL OUTLINE DRAWING (SHEET 2 OF 2)

1-8 KLP 031308

1.4 FEATURES

1.4.1 LOCAL CONTROL

Two front panel rotary encoders allow adjustment of voltage and current setpoints and limits.
Operating mode of the power supply is indicated by lighting either a green (Constant Voltage) or
amber (Constant Current) LED. The output can be enabled or disabled by the front panel DC
OUTPUT switch; an associated indicator lights when the output is enabled (applied to the load).
Two 4-character LEDs normally display actual output voltage and current, or programmed volt­age and current limits in setpoint mode.

The voltage and current controls and their associated LED displays are also used with the
FUNCTION and PROTECT switches and the 4-character status display for various other func­tions described in PAR. 3.2. A local lockout feature (see PAR. 3.2.2.1) prevents alteration of the
power supply settings from the front panel when the power supply is operating in remote mode.

1.4.2 REMOTE CONTROL

Remote control of the KLP Power Supply can be accomplished either through digital or analog
programming.

1.4.2.1 DIGITAL PROGRAMMING

Digital control for -1200 Models is available directly via either the IEEE 488.2 (GPIB) or RS232
ports using SCPI commands. Digital control for -1.2K Models is available directly via either the
IEEE 488.2 (GPIB) port using SCPI commands or via the LAN port using SCPI commands or
web pages. Most features available in local mode can be accessed in remote mode through dig­ital programming, as well as some that are only available via digital remote programming (PAR.

3.3.2). Front panel indicators showing operating mode and output voltage and current are active
when digital programming is used. Refer to the KLP Developer’s Guide for more information
about digital programming.

1.4.2.2 ANALOG PROGRAMMING

KLP Power Supplies can also be controlled remotely using switch selectable voltage or resis­tance. Analog programming functions include voltage and current programming, enabling/dis­abling the output, and voltage and current readback (see PAR. 3.4).

Full scale programming/readback can be programmed using either an input analog voltage or
by an input analog resistance. See PAR. 3.4 for more information.

1.4.3 DIGITAL CALIBRATION

Internal adjustments of the KLP Power Supply are automatic. Calibration can be performed in
either local or remote (using the VXI plug&play demo program) digital mode, using a calibrated
DVM and a corresponding precision shunt resistor.

Calibration constants for programming and read-back activities are calculated by the microcon­troller and stored in the non-volatile memory. No internal adjustments are necessary. The previ­ous calibration is saved and can be restored if desired. The original factory calibration can also
be restored. Calibration is password-protected. Refer to Section 4 for more information.

KLP 031308 1-9

1.4.4 OVERVOLTAGE/OVERCURRENT PROTECTION

Overvoltage and Overcurrent protection values can be individually programmed. If the output
voltage/current exceeds the overvoltage/overcurrent protection value, the protection circuit
latches the output off, flashes an overvoltage (OVP) or overcurrent (OCP) error message on the
status display and sets a status bit that can be retrieved through the RS 232 [-1200 Models
only], LAN [-1.2K Models only], or GPIB port. The N.O. and N.C. contacts of the relay provide
status flags via the Analog I/O port connector. Refer to PAR. 3.2.13.3 for more information.

1.4.5 USER-DEFINED VOLTAGE/CURRENT LIMITS (VIRTUAL MODELS)

The KLP Power Supply can be programmed to user-defined values that can be lower than the
maximum values. For example, the KLP 36-60-1200, will automatically be limited to 1200 Watts
as illustrated in Figure 1-2, however arbitrary limits, e.g., 40A@30V or 30A@35V can be estab­lished. Once the limits are set, setting values exceeding the limit values will not be accepted.
Refer to PAR. 3.2.6 for more information.

1.4.6 STORAGE OF USER-PROGRAMMED ACTIVE SETTINGS

The KLP Power Supply contains 40 memory locations that can be used to store active settings.
This feature is only available via digital remote programming. Values are stored in the nonvola­tile memory, and are retained when the unit is turned off (refer to PAR 3.3.2 for more informa­tion).

1.4.7 USER-PROGRAMMED SEQUENCES

The KLP Power Supply contains 100 memory locations for programming sequences that can
program the KLP to produce a variety of sequential output operations. Each memory location
accommodates a value for voltage and current and a dwell time (how long the parameter is to
be in effect). Values are stored in the volatile memory, and are lost when the unit is turned off
(refer to PAR 3.3.2 for more information).

1.4.8 LAST SETTING RECALL

The KLP Power supply has the ability to retain the last voltage and current setpoints pro­grammed before the unit is shut off. A DIP switch selection (position 3) allows the user to deter­mine whether the power supply is set to 0V, minimum current or the retained voltage and
current setpoints upon the next power-up sequence. Refer to Table 2-2 and PAR. 3.2.7.3 for
more information.

1.4.9 BUILT-IN PROTECTION

KLP Series Power Supplies provide built-in protection against the system faults listed below. In
each case, a detected fault results in immediate latched shutdown of the power supply output.
In addition, the status display flashes the appropriate indication and the status bit is set for
retrieval through either of the digital programming ports. If the internal relay is configured for
FAULT mode (factory default setting, see PAR. 3.2.13.3) the relay will toggle to provide a com­posite fault indication at the analog programming port. The indication time is limited by internal
hold-up capacity for PWR faults (as the unit shuts down, when power is no longer sufficient to
power the relay it de-energizes.

a. Overtemperature (OTP). Monitors heatsink temperature; trips if it exceeds factory set limit.

b. Overvoltage (OVP) or overcurrent (OCP) at the output. (See PAR. 3.2.8)

1-10 KLP 031308

c. Fan failure (FAN). Monitors all three internal cooling fans; trips if failure of any fan.

d. Output Lead Fault (OLF). Monitors output power and sense leads; trips if any discontinuity

(open circuit) is detected in load connections.

e. Source Power Loss (PWR). Monitors internal d-c bus voltage at output of PFC; trips if low

a-c input or PFC failure occurs.

1.4.10 INTERNAL RELAY

An internal relay provides common, normally open and normally closed contacts available to the
user via the analog I/O connector. This relay is normally programmed (factory default) to ener­gize upon detection of a system fault (FLT mode); see PAR. 1.4.9 for a list of faults. The relay
may also be programmed to be energized at the user’s discretion from the front panel (MAN
mode), or as part of a user-specified program using LIST commands (LIST mode). Refer to
PAR. 3.2.13.3 for details.)

1.4.11 MASTER/SLAVE CONTROL [-1200 MODELS ONLY]

For applications that require the use of multiple KLP -1200 Model power supplies in either series
(for higher voltage) or parallel (for redundancy or higher current) the master/slave feature allows
a single power supply (the master) to automatically control both outputs to achieve the desired
output. Refer to PAR. 2.7.8 and 3.2.11 for details.

1.5 EQUIPMENT SUPPLIED

Equipment supplied with the unit is listed in Table 1-3.

1.6 ACCESSORIES

Accessories for the KLP Power Supply are listed in Table 1-4.

1.7 SAFETY

There are no operator serviceable parts inside the case. Service must be referred to authorized
personnel. Using the power supply in a manner not specified by Kepco. Inc. may impair the pro­tection provided by the power supply. Observe all safety precautions noted throughout this man­ual. Table 1-5 lists symbols used on the power supply or in this manual where applicable.

TABLE 1-3. EQUIPMENT SUPPLIED

ITEM

PART NUMBER QUANTITY

Source power connector 142-0381 1

Jumper (24 AWG or larger bus wire) for local sensing connections 172-0585 2

Analog I/O port mating connector 142-0528 1

Documentation CD (includes Documentation and Drivers) 254-0033 1

KLP 031308 1-11/1-12 Blank)

TABLE 1-4. ACCESSORIES

ITEM FUNCTION

KEPCO

PART NUMBER

Line Cord Set (125V/20A) 2.5m long cord set, provides for source power

connection. Mates with NEMA 5-20R receptacle
(see adjacent figure). Supports rated load power
over mains voltage range of 100-136V a-c.

NEMA 5-20R 118-0776

Line Cord Set (125V/15A) 2.5m long cord set, provides for source power

connection. Mates with NEMA 5-15R receptacle
(see adjacent figure). Supports restricted load
power over mains voltage range of 100-136V a-c
(contact Kepco Sales Engineering for details).

NEMA 5-15R 118-1136

Line Cord Set (250V/15A) 2.5m long cord set, provides for source power

connection. Mates with NEMA 6-15R receptacle
(see adjacent figure). Supports rated load power
over mains voltage range of 180-265V a-c.

NEMA 6-15R 118-1137

IEEE 488 (GPIB) Cable, 1m long Connect KLP Power Supply to GPIB bus. SNC 488-1

IEEE 488 (GPIB) Cable, 2m long Connect KLP Power Supply to GPIB bus. SNC 488-2

IEEE 488 (GPIB) Cable, 4m long Connect KLP Power Supply to GPIB bus. SNC 488-4

Chassis Slide (2 required per
power supply)

Allows rack-mounted units to slide in and out. 108-0239

(Jonathan

375-QD Series)

Analog Connector Backshell Locks analog port mating connector to KLP via jackscrews. 108-0204

Loop Back Test Connector Used for verification of RS 232 operation. 195-0112

Null Modem Cable Connect RS 232 port with controlling computer, DB9F to DB9F, 10 ft

long.

118-1176

LAN Patch cable Connects KLP LAN port to LAN, 10 ft long. 118-1115

Support bracket, rear Provides extra support to rear of rack-mounted unit if needed. Two

brackets required per unit. Each bracket requires 2 screws and 2
washers. See Figure 1-3, sheet 1, Detail “A” for requirements.

128-2306

TABLE 1-5. SAFETY SYMBOLS

SYMBOL MEANING

CAUTION: RISK OF ELECTRIC SHOCK.

CAUTION: REFER TO REFERENCED PROCEDURE.

WARNING INDICATES THE POSSIBILITY OF BODILY INJURY OR DEATH.

CAUTION INDICATES THE POSSIBILITY OF EQUIPMENT DAMAGE.

!

KLP-HV 031308 2-1

SECTION 2 - INSTALLATION

2.1 UNPACKING AND INSPECTION

This instrument has been thoroughly inspected and tested prior to packing and is ready for
operation. After careful unpacking, inspect for shipping damage before attempting to operate.
Perform the preliminary operational check as outlined in PAR 2.5. If any indication of damage is
found, file an immediate claim with the responsible transport service.

2.2 TERMINATIONS AND CONTROLS

2.2.1 FRONT PANEL CONTROLS AND INDICATORS. Refer to Figure 2-1 and Table 2-1.

FIGURE 2-1. KLP SERIES, FRONT PANEL CONTROLS AND INDICATORS

2.2.2 REAR PANEL CONNECTORS AND SWITCHES. Refer to Figure 2-2 and Tables 2-2 through

2-7.

TABLE 2-1. CONTROLS, AND INDICATORS

CONTROL OR

INDICATOR

FUNCTION

POWER ON/OFF

Circuit Breaker

Turns the power supply on or off. Applies input power to power supply internal circuits. Circuit breaker
provides input overload protection.

VOLTAGE

control/switch

Multifunction rotary encoder with momentary-contact pushbutton switch. Rotate to set output voltage
(PAR. 3.2.7) and overvoltage limit (PAR. 3.2.8). Also used to enter SET mode of voltage programming
(PAR. 3.2.7.2), change GPIB address (PAR. 3.2.9), change RS232 baud rate (PAR. 3.2.10), enter Vir­tual Model password (PAR. 3.2.6), and enter calibration password and perform calibration (PAR. 4.3).

DC VOLTS

display

Four-digit LED display that shows voltage settings:
a. Shows actual output voltage (default).
b. Shows voltage set point (PAR. 3.2.7.2) or overvoltage limit when function selected (PAR. 3.2.8).

CV

indicator

Green LED lights to indicate power supply is operating in constant voltage mode (see PAR. 3.2.7).

Status

4 character display

Displays active function or blinks for error messages. Normally blank (VOLTAGE and CURRENT
LEDs display actual voltage and current).

CC

indicator

Amber LED lights to indicate power supply is operating in constant current mode (see PAR. 3.2.7).

POWER ON/OFF

Circuit Breaker

VOLTAGE

control/momentary switch

DC VOLTS

display

CV

indicator

Status

display

CC

indicator

DC AMPERES

display

CURRENT

control/momentary switch

DC OUTPUT

indicator

DC OUTPUT

on/off switch

PROTECT

momentary switch

LAN

indicator

[-1.2K Models only]

FUNCTION

momentary switch

2-2 KLP-HV 031308

DC AMPERES

display

Four-digit LED display that shows current settings:
a. Shows actual output current (PAR.3.2.7).
b. Shows current set point or overcurrent limit when function selected (PAR. 3.2.7.2).
c. Shows GPIB address (PAR. 3.2.9), baud rate (PAR. 3.2.10).
d. Shows unit password (PAR. 3.2.6 and PAR. 4.3).

CURRENT

control/

momentary switch

Multifunction rotary encoder with momentary-contact pushbutton switch. Rotate to set output current
(PAR. 3.2.7) and overcurrent limit (PAR. 3.2.8). Also used to enter SET mode of current programming
(PAR. 3.2.7.2), change GPIB address (PAR. 3.2.9), change RS232 baud rate (PAR. 3.2.10), enter Vir­tual Model password (PAR. 3.2.6), and enter calibration password and perform calibration (PAR. 4.3).

DC OUTPUT

indicator

Green LED lights when DC output is enabled. LED is off when output is disabled.

DC OUTPUT

on/off switch

Enables or disables the DC Output. When output is disabled, current and voltage are programmed to
minimal value and zero, respectively (PAR. 3.2.3). Also used to accept front panel inputs.

PROTECT

momentary switch

Used to set overvoltage and overcurrent (PAR. 3.2.8) protection limits.
NOTE: Requires a thin tool (e.g., end of paper clip) to press switch.

LAN Indicator

[-1.2K Models only]

Green LED indicates when LAN interface is installed and valid IP address found. Can be intentionally
blinked using the web-based interface to identify which unit is being accessed in a multi-unit environ­ment. During initialization the LED blinks rapidly while attempting to locate a valid IP address. If suc­cessful, LED stays on without blinking; LED not lit indicates failure.

FUNCTION

momentary switch

Used to set user-determined limits on voltage and current (virtual model) (PAR. 3.2.6) , change GPIB
address (PAR. 3.2.9), change RS232 baud rate (-1200 Models only, PAR. 3.2.10), set up master/slave
operation (-1200 Models only, PAR. 3.2.11), set up LAN interface (-1.2K Models only, PAR. 3.2.12),
and enter the Utility menu (PAR. 3.2.13). The utility menu is used display Firmware Version (PAR.

3.2.13.1), display Model (PAR. 3.2.13.2), configure the internal relay (PAR. 3.2.13.3), configure quick­boot (PAR. 3.2.13.4), configure Remote Inhibit (high or low) and determine how the unit responds to
faults (PAR. 3.2.13.5), calibrate analog inputs (PAR. 3.2.13.6), and enter calibration (PAR. 4.3). NOTE:
Requires a thin tool (e.g., end of paper clip) to press switch.

TABLE 2-2. ANALOG I/O SWITCH FUNCTIONS

DIP SWITCH

POSITION

FUNCTION SETTINGS

1

Allows analog programming commands for

voltage to be provided

by either variable voltage (PAR. 3.4.3) or resistance (PAR. 3.4.2).

ON: Selects Resistance
OFF: Selects Voltage (factory

default)

2

Allows analog programming commands for

current to be provided

by either variable voltage (PAR. 3.4.3) or resistance (PAR. 3.4.2).

ON: Selects Resistance
OFF: Selects Voltage (factory

default)

3

Allows retention of the last entered setpoint values for voltage and
current in non-volatile memory for recall at the next power-up
sequence. (see PAR. 3.2.7.3).

ON: Save and recall previous set-

point values upon power-up.

OFF: Power-up set to 0 Volts and

minimum current (factory
default).

4 Reserved - Do not use.

5

Allows locking of the front panel controls. (see PAR. 3.2.2.1) ON: Local controls locked.

OFF: Local controls enabled (fac-

tory default).

TABLE 2-1. CONTROLS, AND INDICATORS (CONTINUED)

CONTROL OR

INDICATOR

FUNCTION

KLP-HV 031308 2-3

FIGURE 2-2. KLP SERIES, REAR PANEL SWITCH AND CONNECTORS

2-4 KLP-HV 031308

TABLE 2-3. IEEE 488 PORT CONNECTOR (J4) PIN ASSIGNMENTS

PIN SIGNAL NAME FUNCTION

1

D

I01

I/O Line

2

D

I02

I/O Line

3

D

I03

I/O Line

4

D

I04

I/O Line

5 EOI End or Identify

6 D AV D ata Va l id

7 NRFD Not Ready for Data

8 NDAC Not Data Accepted

9 IFC Interface Clear

10 SRQ Service Request

11 ATN Attention

12 SHIELD Shield

13

D

I05

I/O Line

14

D

I06

I/O Line

15

D

I07

I/O Line

16

D

I08

I/O Line

17 REN Remote Enable

18 GND Ground (signal common)

19 GND Ground (signal common)

20 GND Ground (signal common)

21 GND Ground (signal common)

22 GND Ground (signal common)

23 GND Ground (signal common)

24 LOGIC GND Logic Ground

TABLE 2-4. RS232 PORT CONNECTOR (J3) PIN ASSIGNMENTS [-1200 MODELS ONLY]

PIN SIGNAL NAME FUNCTION

NOTE: A null modem cable (see Table 1-4) is required for nearly all applications, with the exception of

those in which RXD and TXD line transposition is accomplished via external hardware (e.g.
older Apple MAC computers with D-sub serial port).

1 DCD Data Carrier Detect (protocol not used)

2RXD Receive Data

3 TXD Transmit Data

4 DTR Data Terminal Ready (protocol not used)

5 SGND Signal Ground

6 DSR Data Set Ready (protocol not used)

7 RTS Request To Send (protocol not used)

8 CTS Clear To Send (protocol not used)

9 RI Ringer Indicator (protocol not used)

KLP-HV 031308 2-5

TABLE 2-5. LAN PORT CONNECTOR (J7) PIN ASSIGNMENTS [-1.2K MODELS ONLY]

PIN SIGNAL NAME FUNCTION

1 TX+ Transmit +

2 TX– Transmit –

3 NOT USED

4 NOT USED

5 NOT USED

6 NOT USED

7RX+ Receive +

8RX– Receive –

TABLE 2-6. CONTROL INPUT TERMINAL BLOCK ASSIGNMENTS

TERMINAL FUNCTION

M+ Positive output monitor connection (TB5) (see PAR. 2.7.5.1)

S+ Positive sense connection (TB4) (see PAR. 2.7.5.1)

CS Current Share bus (TB3) (see PAR. 2.7.7.1)

S- Negative sense connection (TB2) (see PAR. 2.7.5.1)

M- Negative output monitor connection (TB1) (see PAR. 2.7.5.1)

TABLE 2-7. ANALOG I/O CONNECTOR (J2) PIN ASSIGNMENTS

PIN SIGNAL NAME FUNCTION

1 Cref Analog signal which programs output current from zero to full scale. Voltage or resistance programming

is selected via DIP switch position 2 (See Table 2-2). Refer to PAR. 3.4.3 for voltage programming and

3.4.2 for resistance programming.

2 RELAY_NO Connected to RELAY_COM (pin 4) for relay energized condition.

(1)

3 Vref Analog signal which programs output voltage from zero to full scale. Voltage or resistance program-

ming is selected via DIP switch position 1 (See Table 2-2). Refer to PAR. 3.4.3 for voltage programming
and 3.4.2 for resistance programming.

4 RELAY_COM Relay common.

(1)

5 Reserved.

6 VOLT_RBACK Analog signal which represents output voltage from zero to full scale. The full scale programming level

sets the full scale readback level (see PAR. 4.3.3).

7 CURR_RBACK Analog signal which represents output current from zero to full scale. The full scale programming level

sets the full scale readback level (see PAR. 4.3.3).

8 REM_INH Allows single signal to control output on/off. See PAR. 3.4.1.

9 GND Ground

(2)

10 RELAY_NC Connected to RELAY_COM (pin 4) for relay not energized condition

(1)

11 GND Ground

12 ANALOG_CTRL Enables or disables analog programming (see PAR. 3.4).

1 = Analog programming disabled (default, no connection)
0 = Analog programming accepted (use jumper on mating connector to connect to pin 9, 11, 13 or 15
(ground).

13 GND Ground

14 EXT_TRG Performs same function as SCPI *TRG command if unit is programmed for external triggering via digital

remote mode. Transition from 1 (+5V) to 0 (ground) causes values established by VTRIG and CTRIG
commands to become VSET and CSET (see PAR 3.3.2, External Triggering).

15 GND Ground

(1)

Refer to PAR. 3.2.13.3 to configure internal relay.

(2)

All GND connections are common.

2-6 KLP-HV 031308

2.3 SOURCE POWER REQUIREMENTS

This power supply operates with the installed circuit breaker from either d-c or single phase a-c
mains power over the voltage and frequency ranges specified in Table 1-2 without adjustment or
modification.

2.4 COOLING

The power devices used within the power supply are maintained within their operating tempera­ture range by means of internal heat sink assemblies cooled by three internal (d-c type) cooling
fans.

ALL INLET AND EXHAUST OPENINGS AT THE FRONT AND REAR OF THE POWER SUP­PLY CASE MUST BE KEPT CLEAR OF OBSTRUCTION TO ENSURE PROPER AIR ENTRY
AND EXHAUST. Although not a requirement, it is recommended that side and top vent open­ings be clear of obstruction for more efficient cooling. Periodic cleaning of the power supply inte­rior is recommended by authorized service personnel only (see KLP Service Manual for
instructions).

If the power supply is rack mounted, or installed within a confined space, care must be taken
that the ambient temperature, which is the temperature of the air immediately surrounding the
power supply, does not rise above the specified limits (see Table 1-2).

2.5 PRELIMINARY OPERATIONAL CHECK

A simple operational check after unpacking and before equipment installation is advisable to
ascertain whether the power supply has suffered damage resulting from shipping.

Refer to Figures 2-1 and 2-2 for location of operating controls and electrical connections. Table
2-1 explains the functions of operating controls and indicators.

NOTE: This test must be performed with IEEE 488, RS232 [-1200 Models], LAN [-1.2K Mod-

els] and ANALOG I/O ports disconnected, and ANALOG I/O SETTINGS switch posi­tions 3 and 5 set to OFF.

1. With POWER circuit breaker set to OFF position, connect the power supply to source
power (see PAR. 2.7.2).

2. With no load connected, set POWER circuit breaker to the ON position. Each time the unit
is turned on an internal self-test is performed. After the test has been successfully com­pleted, the unit displays the following:

• The status display flashes MODL (model) for two seconds while the DC VOLTS display
shows Eo

MAX

and the DC AMPERES display shows Io

MAX

. (E.g. for model 75-33-1200,

DC VOLTS reads 75 and DC AMPERES reads 33.)

• Then the status display flashes VIRT (Virtual model) for two seconds while the DC
VOLTS display shows Eo

MAX

and the DC AMPERES display shows the current corre­sponding to 1200W. (E.g. for model 75-33-1200, DC VOLTS reads 75 and DC
AMPERES reads 16.)

• Then the status display flashes PROT (protection limits) for two seconds while the DC
VOLTS display shows 120% of Eo

MAX

and the DC AMPERES display shows 120% of

current corresponding to 1200W. (E.g. for model 75-33-1200, DC VOLTS reads 90.0

KLP-HV 031308 2-7

and DC AMPERES reads 19.2.)

• Then the status display reads SET (setpoint mode), the DC VOLTS display reads 0
Volts, the DC AMPERES display reads minimum Amperes (see Note 1, below).

NOTES: 1. A minimum programmed current (actual value depends on model) is required to

ensure proper operation of the power supply under all load conditions. Pro­grammed current is automatically set to be at least the minimum current.

2. If an error indication is blinking in the Status display, refer to Table 3-1 for an expla­nation of error codes.

3. Rotate VOLTAGE adjust knob clockwise. Verify that DC VOLTS display increases in large
(X 100) increments.

4. Press and rotate VOLTA G E adjust knob clockwise. Verify the DC VOLTS display increases
in finer increments than step 3, then release knob.

5. Adjust VOLTAGE adjust knob clockwise until Status display reads >MAX. Tap either VOLT-
AGE or CURRENT adjust knob once to enter values. Verify Status display is blank

6. Connect a digital voltmeter (DVM) to the (M+) and (M–) terminals on the rear panel.

7. Press and release DC OUTPUT switch to enable the output. Verify DC OUTPUT indicator
lights.

8. Compare the programmed output voltage value (step 5) with the voltage reading of the
DVM; the difference between the two should not exceed 0.05% of the maximum voltage of
the unit.

9. Compare the voltage reading of the DC VOLTS display with that of the DVM; the difference
between the two should not exceed 0.1% of the maximum voltage of the unit.

10. Enter different value for output voltage, then repeat steps 8 and 9 using different values for
programmed voltage.

11. Disable the output by pressing and releasing DC OUTPUT switch; verify front panel DC
VOLTS and DC AMPERES displays read 0.0V and minimal current and the DC OUTPUT
indicator is off.

2.6 INSTALLATION

2.6.1 RACK MOUNTING

The unit is intended to be mounted directly in a 19-inch wide rack. Optional slides (see Table 1-

4) can be used.

2.7 WIRING INSTRUCTIONS

Interconnections between an a-c power source and the power supply, and between the power
supply and its load are as critical as the interface between other types of electronic equipment.
If optimum performance is expected, certain rules for the interconnection of source, power sup­ply and load must be observed by the user. These rules are described in detail in the following
paragraphs.

2-8 KLP-HV 031308

2.7.1 SAFETY GROUNDING

Local, national and international safety rules dictate the earth grounding of the metal cover and
case of any instrument connected to the a-c power source, when such grounding is an intrinsic
part of the safety aspect of the instrument.

KLP is provided with a three-terminal IEC appliance coupler for connection of the mains supply
source, one terminal of which is dedicated for the protective earthing conductor; no other ground
or earth connection is required, although the chassis may be separately connected to earth
ground for noise or other performance considerations (frame grounding).

The instructions below suggest wiring methods which comply with these safety requirements;
however, in the event that the specific installation for the power system is different from the rec­ommended wiring, it is the customer's responsibility to ensure that all applicable electric codes
for safety grounding requirements are met.

2.7.2 SOURCE POWER

2.7.2.1 CURRENT RATING

All switchmode power supplies, including the KLP series, present a constant power characteris­tic to the input power source. Consequently, the power supply draws maximum input current for
a given load power at low input voltage, and proportionately less as source voltage is raised
according to the formula

Input Current = Output Power / (Efficiency x Input Voltage)

The input power circuit breaker of the power supply is rated to support rated load power under
worst-case efficiency conditions at the lowest rated source voltage (100V a-c), and provides the
necessary overload protection to the power supply's internal circuitry. The user must provide a
properly sized and rated mains lead (line cord) and service with a current rating compatible with
the anticipated input current. The Table 2-8 provides recommendations for service current rating
and mains lead wire size for common a-c mains voltages. Table 1-4 lists line cords currently
available as accessories.

For continuous operation at output power levels lower than 1000 watts, or for other line cord
styles, contact Kepco Applications Engineering for additional options.

2.7.2.2 CONNECTIONS

Source power is connected at the rear panel of the KLP power supply (see Figure 2-2) via the
IEC 320-style recessed power inlet connector, which provides interface to a three-wire safety
line cord via a polarized mating plug. A user-wirable mating connector is provided. Terminal
assignment follows internationally accepted conventions. It is the user's responsibility to ensure
that all applicable local codes for source power wiring are met. Kepco also makes a variety of
prefabricated safety line cord sets available for connecting KLP to source power via conven­tional box-mounted receptacles. Table 1-4 lists three popular cord set variants for North Ameri­can applications. For other options please contact Kepco Sales Engineering with specific
requirements.

TABLE 2-8. INPUT CURRENT SERVICE RATING AND CONDUCTOR SIZES

MAINS VOLTAGE RANGE CURRENT SERVICE RATING CONDUCTOR SIZE

100 - 132V a-c, 50/60Hz 20 Amp #12AWG [2,0 mm²]

180 - 265V a-c, 50/60Hz 15 Amp #14AWG [3,0 mm²]

KLP-HV 031308 2-9

WARNING

IT IS IMPERATIVE THAT THE USER PROVIDE ALL THREE SOURCE
WIRE CONNECTIONS, AS THIS CONNECTION IS THE SAFETY
GROUND PROVISION!

2.7.3 D-C OUTPUT GROUNDING

Connections between the power supply and the load and sensing connections may, despite pre­cautions such as shielding, twisting of wire pairs, etc., be influenced by radiated noise, or “pick­up”. To minimize the effects of this radiated noise the user should consider grounding one side
of the power supply/load circuit. The success of d-c grounding requires careful analysis of each
specific application, however, and this recommendation can only serve as a general guideline.

One of the most important considerations in establishing a successful grounding scheme is to
avoid GROUND LOOPS. Ground loops are created when two or more points are grounded at
different physical locations along the output circuit. Due to the interconnection impedance
between the separated grounding points, a difference voltage and resultant current flow is
superimposed on the load. The effect of this ground loop can be anything from an undesirable
increase in output noise to disruption of power supply and/or load operation. The only way to
avoid ground loops is to ensure that the entire output/load circuit is fully isolated from ground,
and only then establish a single point along the output/load circuit as the single-wire ground
point.

The exact location of the “best” d-c ground point is entirely dependent upon the specific applica­tion, and its selection requires a combination of analysis, good judgement and some amount of
empirical testing. If there is a choice in selecting either the positive or negative output of the
power supply for the d-c ground point, both sides should be tried, and preference given to the
ground point producing the least noise. For single, isolated loads the d-c ground point is often
best located directly at one of the output terminals of the power supply; when remote error sens­ing is employed, d-c ground may be established at the point of sense lead attachment. In the
specific case of an internally-grounded load, the d-c ground point is automatically established at
the load.

The power supply output terminals (located on the rear panel) for KLP Power Supplies are d-c
isolated (“floating”) from the chassis in order to permit the user maximum flexibility in selecting
the best single point ground location. Output ripple specifications as measured at the output are
equally valid for either side grounded. Care must be taken in measuring the ripple and noise at
the power supply: measuring devices which are a-c line operated can often introduce additional
ripple and noise into the circuit.

There is, unfortunately, no “best” method for interconnecting the load and power supply. Individ­ual applications, location and nature of the load require careful analysis in each case. It is hoped
that the preceding paragraphs will be of some assistance in most cases. For help in special
applications or difficult problems, consult directly with Kepco's Application Engineering Depart­ment.

2-10 KLP-HV 031308

2.7.4 POWER SUPPLY/LOAD INTERFACE

The general function of a voltage or current stabilized power supply is to deliver the rated output
quantities to the connected load. The load may have any conceivable characteristic: it may be
fixed or variable, it may have predominantly resistive, capacitive or inductive parameters; it may
be located very close to the power supply output terminals or it may be a considerable distance
away. The perfect interface between a power supply and its load would mean that the specified
performance at the output terminals would be transferred without impairment to any load,
regardless of electrical characteristics or proximity to each other.

The stabilized d-c power supply is definitely not an ideal voltage or current source, and practical
interfaces definitely fall short of the ideal. All voltage-stabilized power supplies have a finite
source impedance which increases with frequency, and all current-stabilized power supplies
have a finite shunt impedance which decreases with frequency. The method of interface
between the power supply output and the load must, therefore, take into account not only the
size with regard to minimum voltage drop, but the configuration with regard to minimizing the
impedance introduced by practical interconnection techniques (wire, bus bars, etc.). The series
inductance of the load wire must be as small as possible as compared to the source inductance
of the power supply: although the error sensing connection to the load compensates for the d-c
voltage drop in the power leads, it cannot completely compensate for the undesirable output
effects of the power lead inductance. These lead impedances (both power and sensing leads)
are especially important if the load is a) constantly modulated or step-programmed, b) has pri­marily reactive characteristics, or c) where the dynamic output response of the power supply is
critical to load performance.

2.7.5 LOAD CONNECTION - GENERAL

Load connections to the KLP power supply are achieved via the (+) and (–) DC OUTPUT termi­nals located on the rear panel; (+M) and (–M) outputs are also available at terminal blocks (TB5
and TB1, respectively) located on the panel for connection of external monitoring equipment
such as a DVM, oscilloscope, etc.

Configuration of local or remote sensing is facilitated by pre-installed jumpers which configure
the unit for local sensing.as shown in Figure 2-2.

NOTE: REGARDLESS OF OUTPUT CONFIGURATION, OUTPUT SENSE LINES MUST BE

CONNECTED FOR PROPER OPERATION, EITHER LOCALLY, OR AT THE LOAD
(REMOTE). OBSERVE POLARITIES: THE +S TERMINAL MUST BE CONNECTED
TO EITHER +M (LOCAL) OR +LOAD (REMOTE), AND THE –S TERMINAL MUST BE
CONNECTED TO EITHER –M (LOCAL) OR –LOAD (REMOTE).

2.7.5.1 LOCAL SENSING/REMOTE SENSING SELECT

Local sensing (factory default configuration) is established by connecting terminal TB4 (+S) to
TB5 (+M) and TB1 (–M) to TB2 (–S) (see Figure 2-2). The power supply is shipped with two
jumpers installed to obtain local sensing.

Remote sensing is established by first removing the factory-installed local sensing jumpers
between +S and +M and between –M and –S. The +S and –S lines must be connected at the
load (see Figure 2-3). A high frequency bypass network consisting of two capacitors connected
across the load as shown in Figure 2-3 is recommended to reduce noise in the sense loop.

KLP-HV 031308 2-11

FIGURE 2-3. REMOTE SENSING

2.7.6 SERIES OPERATION

Units may be connected in series to obtain higher output voltages. Each power supply in the
series may be protected by a clamping diode connected in its non-conducting direction in paral­lel with the output. This diode protects the power supply outputs against secondary effects in the
event of a load short. (Note that this is NOT the same as the blocking diode used for parallel/
redundant operation.) Selection of the clamping diode is entirely dependent upon output volt­age/current parameters. The clamping diode must be rated for the maximum voltage and cur­rent of the series connection. Several clamping diodes in parallel may be required to meet the
total current rating. The user must also respect the ±600V d-c maximum isolation from output to
chassis when determining the maximum series voltage. Figure 2-4 shows a series connection of
two KLP power supplies using remote sensing. Kepco strongly recommends that series applica­tions employ master/slave control (available on -1200 Models only) as described in PAR’s. 2.7.8
and 3.2.11.

2.7.7 PARALLEL/REDUNDANT OPERATION

Identical KLP power supply models may be connected in parallel in order to provide increased
output current to a common load (see Figure 2-5). This permits the user to obtain significantly
higher load ratings than for a single KLP power supply. The number of power supplies required
is determined by dividing the required load current by the current rating of the applicable KLP
model, and rounding up to the next whole number when necessary. KLP power supplies utilize
active current sharing circuitry to distribute the load current equally among the paralleled units.
Redundant operation is achieved by paralleling one or more power supplies than the minimum
number required to support the load; in this way, system operation is not compromised by the
failure of a single power supply. Any number of KLP power supplies (N+M) can be wired for
redundant operation as long as (N) power supplies can support the load, M representing the
total number of failed power supplies. When operating KLP power supplies in any parallel con­figuration, load sharing must be implemented among the paralleled modules. Kepco strongly
recommends that parallel/redundant applications employ master/slave control (available on

-1200 Models only) as described in PAR’s. 2.7.8 and 3.2.11.

2-12 KLP-HV 031308

FIGURE 2-4. SERIES CONNECTION USING REMOTE SENSING

FIGURE 2-5. PARALLEL CONNECTIONS USING REMOTE SENSING

2.7.6

KLP-HV 031308 2-13

2.7.7.1 LOAD SHARING

When operating two or more power supplies in parallel, either for capacity or redundancy, it is
desirable to distribute the load equally among all of the power supplies in order to improve per­formance, reduce stress and increase reliability. KLP power supplies incorporate active circuitry
which forces multiple power supplies wired in parallel to share load current, both in voltage- and
current-mode regulation. The KLP employs a single wire connection between paralleled power
supplies, forming a master-slave relationship as follows: the highest voltage unit becomes the
master, and all of the remaining units are slaved to it via the current share signal (CS, available
at the rear panel terminal A3TB3, Figure 2-2), which boosts the slave outputs in order to
increase load share. A maximum boost limit prevents the slave units from following a defective
master into an overvoltage condition, or from creating a load hazard if either the slave itself or
the load sharing system is defective.

When implementing load sharing, the user must ensure that all power supplies are attempting to
regulate to the same voltage at the same location, and must minimize the possibility of load
share signal corruption; the power supplies should, as nearly as possible, emulate a single large
power supply. To this end, the following rules apply:

a. If possible, remote error sensing should be employed, with all error sensing connections ter-

minated at the same physical point, and as close to the power supplies as possible; if local
error sensing is required, power lead voltage drops must be minimized. Provide local noise
decoupling capacitors across all sense wire termination points.

b. The power supplies should be located as near to each other as possible, with power termina-

tions bussed together using adequately sized interconnections; the power supply/load inter­connections should be distributed evenly along the power supply output interconnection bus­ses. This is especially important in high-current systems employing several power supply
modules in parallel, where voltage drops in the interface connections can be significant in
comparison to the load share signal voltage and introduce both d-c and a-c errors.

c. All power supply output voltages should be adjusted as closely as possible, and in any case

within a 1% error band. Additionally, the current limit setpoints should be identical and high
enough to support the load requirements; for (N+M) systems, this means setting the current
limits high enough to tolerate loss of M power supplies and still support the load.

d. Minimize the current share signal wire interconnection lengths to reduce risk of noise influ-

ence.

2.7.8 MASTER/SLAVE CONFIGURATIONS [-1200 MODELS ONLY]

Master/slave configurations of power supply pairs can be used to allow changes to output volt­age/current of one supply (master) to affect the output of the other (slave). Both units of a mas­ter/slave configuration must be identical models. Master/slave control is implemented using the
RS 232 ports. After connecting the series or parallel pair (see PAR. 2.7.6 or 2.7.7, respectively),
use a null modem cable, minimum length 0.5 foot, DB9F-DB9F, to connect the RS 232 ports of
both power supplies. Then refer to PAR. 3.2.11 to complete the setup of each power supply in
the master/slave configuration.

2-14 KLP-HV 031308

2.7.9 ANALOG I/O CONNECTIONS

The Analog I/O Port connector, located on the rear panel of the KLP power supply (see Figure
2-2), provides access for all analog programming inputs and status signal outputs. In addition,
an external trigger input is available for use with SCPI *TRG and TRIG commands. Refer to
Table 2-7 for analog I/O programming signal pin assignments and descriptions.

These signals must be protected from radiated and conducted noise as well as from physical
contact with non-valid driving sources. The following subsections address specific programming
signal applications; in general, however, when accessing this connector from distant locations
or high-noise environments, it is recommended that a shielded cable be used, with the shield
terminated to the system's single point ground.

a. Analog Programming Enable (ANALOG_CTRL)

Connect pin 12 (Analog Control) to pin 9, 11, 13, or 15 (ground) to enable analog I/O pro­gramming.

b. External Voltage and Current Programming (V_Ref and C_Ref)

Twist the voltage programming signal V_Ref (pin 3), Current Programming signal C_Ref (pin

1) and ground (pin 9, 11, 13, or 15). Configure Analog I/O switch positions 1 and 2 to use
either voltage or resistance as the programming source. Factory default for full scale output
is 10V or 10 Kohms (see par. 4.3.3 to set lower values for full scale output).

c. Voltage and Current Readback (VOLT_RBACK and CURR_RBACK)

Twist the voltage readback signal VOLT_RBACK (pin 6), Current readback signal
CURR_RBACK (pin 7) together with ground (pin 9, 11, 13, or 15). Full scale readback volt­ages are identical to selected full scale programming voltages (see PAR. 4.3.3).

d. Remote Inhibit (REM_INH)

Twist remote inhibit (pin 8) together with ground (pin 9, 11, 13, or 15). See PAR. 3.2.13.5.1 to
configure active high or low and PAR. 3.4.1 to enable/disable the output using remote inhibit.

e. Fault Connections (RELAY_NC, RELAY_COM, RELAY_NO

It is recommended that normally open and normally closed relay signals RELAY_NC (pin 10)
and/or RELAY_NO (pin 2), respectively, be twisted together with RELAY_COM (pin 4) as
needed to eliminate noise pickup. See PAR. 3.2.13.3 to configure internal relay.

f. External Trigger (EXT_TRIG)

External Trigger may be used with the SCPI TRIG commands (see KLP Developer’s Guide)
during digital remote operation. For noise suppression it is recommended that wires from
EXT_TRIG, pin 14 and ground (pin 9, 11, 13, or 15) be twisted together.

2.8 DIGITAL CONNECTIONS

The following paragraphs describe the connections required to use the GPIB, RS 232 [-1200
Models only] or LAN [-1.2K models only] ports for remote control of the unit.

2.8.1 GPIB CONNECTIONS

Your computer must have a GPIB interface card installed. Connect the power supply to the
computer’s GPIB interface card. Use a standard GPIB interface cable at the GPIB port on the
rear panel (See Figure 2-2). Refer to Table 2-3 for GPIB port pin assignments. Refer to PAR.

3.2.9 to change the default GPIB address (6) from the front panel.

KLP-HV 031308 2-15/(2-16 Blank)

2.8.2 RS 232 CONNECTIONS [-1200 MODELS ONLY]

Communications between KLP, considered data terminal equipment (DTE), and data communi­cations equipment (DCE), e.g. a modem, requires a patch cable, or one with a pin-for-pin rela­tionship between terminating connectors. A null modem cable is necessary for nearly all
applications, with the exception of those in which the RXD and TXD line transposition is accom­plished via external hardware (e.g. older Apple MAC computers with D-sub serial port). See
Table 2-4 for RS 232 port pin assignments. Connect the cable to the KLP at the RS 232 port
located on the rear panel (See Figure 2-2). Refer to PAR. 3.2.10 to change the default baud rate
(38400) from the front panel.

2.8.3 LAN CONNECTIONS [-1.2K MODELS ONLY]

Connect the KLP to the LAN via the RJ 45 LAN port located at the rear panel (See Figure 2-2).
Refer to Table 2-5 for LAN port pin assignments. Refer to PAR 3.2.12 to configure the LAN inter­face from the front panel. Some configuration can also be done through the web interface (see
PAR. 3.3.6.3). Refer to the KLP Developer’s Guide for the associated SCPI commands

KLP031308 3-1

SECTION 3 - OPERATION

3.1 GENERAL

This section explains how to operate the KLP Power Supply. Series KLP feature three modes of
operation:

• Local Mode: This is the default operating mode, providing full access to all programming
and readback functions via front panel displays, controls, and indicators (see PAR. 3.2).

• Digital Remote Mode (see PAR. 3.3): This mode is selected via commands transmitted
through one of the two digital ports. One port is configured for IEEE-488 (GPIB), The
second port is either an RS 232 port [-1200 Models] or a LAN port [-1.2K models]. The
digital ports are described in the KLP Developer’s Guide. The power supply automati­cally goes into digital remote mode when commands are accepted via one of the digital
ports.

• Analog Remote Mode: This mode is selected via a jumper wire at the analog program­ming port prior to initial turn-on, and provides limited access to programming and read­back functions (see PAR. 3.4).

3.2 LOCAL MODE OPERATION

Local operation of the KLP Power Supply is accomplished via the front panel switches and con­trols illustrated in Figure 2-1 and described in detail in Table 2-1. Separate 4-digit LEDs display
actual output voltage and current; these same displays show set points and limits as well. Sta­tus and fault indications are provided by a 4-character alpha-numeric display.

3.2.1 TURNING THE POWER SUPPLY ON

1. To turn the power supply on, set POWER ON/OFF circuit breaker (1, Figure 2-1) to ON.
Apply firm, continuous pressure to rocker actuator until fully engaged (right side of rocker
actuator locked parallel to front panel). If actuator does not lock when released, allow actua­tor to return to starting position, then wait a few seconds before repeating turn-on sequence.
DO NOT attempt to "tease" the switch contacts closed by repetitive press-and-release
action. The circuit breaker is "trip-free" design; if overload exists, contacts cannot be held
closed by actuator.

2. When the power supply is turned on, it performs a self-test and displays the following infor­mation:

• status display flashes MODL for 2 seconds while DC VOLTS and DC AMPERES dis-
plays show the maximum voltage and current capability of the unit.

• status display flashes VIRT for 2 seconds while DC VOLTS and DC AMPERES dis-
plays show the maximum voltage and current allowed for a previously programmed vir­tual model. To reprogram the maximum allowable voltage and/or current, refer to PAR.

3.2.6 to define a virtual model.

• Status display flashes PROT for 2 seconds while DC VOLTS and DC AMPERES dis-
plays show previously stored OVP and OCP trigger levels. NOTE: to reprogram OVP
or OVC, refer to PAR. 3.2.8.

NOTE: To eliminate the display of model, virtual model, and protection levels on power-up,

refer to PAR. 3.2.13.4 for quick boot.

3-2 KLP031308

• For -1.2K Models, the LAN indicator blinks rapidly during initialization. If an IP address
is found, it stays on without blinking. If an IP address is not found, the LAN indicator
stays off.

• If any fault is configured for AUTO recovery (see PAR. 3.2.13.5.2), the status display
flashes AUTO for one second.

• If remote inhibit is active (see PAR. 3.4.1) upon power-up, the status display flashes
rINH for one second.

• If an error occurs, an error code is displayed in the status display (see Table 3-1).

3. After a successful self test, the default conditions upon power up are as follows:

• Status display shows SET,

• output is disabled (green DC OUTPUT indicator is off). If remote analog mode is
selected (PAR. 3.4), output is enabled unless Remote Inhibit, pin 8 of the Analog I/O
Connector (see Figure 2-2 and Table 2-7) is grounded.

• DC VOLTS and DC AMPERES displays show programmed output conditions: either 0
Volts, minimum Amperes (see NOTE, PAR. 3.2.1) or, if DIP switch position 3 enabled
(see Table 2-2), previously saved setpoint values in effect upon power off.

NOTE: A minimum programmed current is required to ensure proper operation of the power

supply under all load conditions. Programmed current is automatically set to be at least
the minimum current (actual value depends on model, see Table 1-1).

• Since the output is off, Constant Voltage (CV) mode indicator (green LED) and Con­stant Current (CC) indicator (amber LED) are off.

TABLE 3-1. POWER-UP BUILT-IN TEST ERROR CODES

ERROR CODE MEANING

E310

System Error

E313

Calibration Memory Error

E315

Configuration Memory Error

E341

Memory Error (CRC)

E330

Self Test Error

Ecal

Calibration Error - The unit will try to restore the previous calibration.

Eclp

Previous Calibration Error - After detecting a Calibration Error (Ecal) and trying to use
the previous calibration, an error was detected, and the unit will attempt to restore the
factory calibration.

Eclf

Factory Calibration Error - The unit has failed to restore the factory calibration after
failing to restore the previous calibration. The unit will not operate after this error has
been displayed and must be referred for service.

NOTE: During power-up the power supply performs detailed software check sequences. If a failure is detected dur­ing power-up, the DC VOLTS and DC AMPERES displays are blanked and the Status display shows an error code.
For errors that occur after power-up, refer to the Developer’s Guide for typical error codes and possible causes. For
these and all other error codes, refer to authorized service personnel if corrective action is required.

KLP031308 3-3

3.2.2 SETTING LOCAL/REMOTE MODE

LOCAL MODE. When the power supply is turned on, it is automatically set to Local mode as
long as Analog I/O port pin 12 is not grounded. In local mode the Status display is normally
blank.

DIGITAL REMOTE MODE. The power supply will automatically go into digital remote mode
when digital remote commands are accepted via the GPIB, RS232, or LAN ports. In digital
remote mode the power supply normally shows dRem in the status display. The LAN indicator
[-1.2K models only] is on when a valid IP address has been found. When in digital remote mode,
all front panel controls are disabled. If desired, local mode can be restored by pressing both
VOLTAGE and CURRENT controls simultaneously; the power supply will then remain in local
mode until another digital command is received, causing the unit to return to remote digital
mode. The OPERATE INSTRUMENT web page [-1.2K Models only] must not be active when
restoring local mode. To disable local mode entirely, see PAR. 3.2.2.1 for front panel lockout.

NOTE: During both LOCAL and DIGITAL REMOTE operation, the analog readback signals

(voltage and current) remain available, as does the remote inhibit signal; only program­ming signals are disregarded.

ANALOG REMOTE: With power supply turned off, ground Analog I/O port pin 12. Refer to PAR.

2.7.9 to configure the Analog I/O Port; refer to Table 2-2 to configure the Analog I/O switch.
When the power supply is turned on, the status display shows aRem (Analog Remote program­ming selected). The unit will accept Analog Remote commands (see PAR. 3.4) and front panel
controls are disabled, except that the DC OUTPUT ON/OFF switch is operational. Local mode
can be restored by pressing the VOLTAGE and CURRENT controls at the same time. Once
local mode has been restored, analog remote programming is disabled until the unit is powered
off, then on again.

NOTE While Analog Remote programming is active, the unit will respond to digital queries,

but will not respond to most digital commands, except for the front panel unlock com­mand (see PAR. 3.2.2.1). Note that digital commands that conflict with the analog pro­gramming settings must not be issued, as these can cause momentary unpredictability
at the output until analog control is reasserted.

3.2.2.1 REMOTE WITH LOCAL (FRONT PANEL) LOCKOUT

To prevent unauthorized setting of the power supply to Local mode, a local lockout mode can be
enabled which prevents the power supply from being restored to local mode via the front panel.

With the power supply turned off, set the ANALOG I/O DIP switch, position 5 (see Table 2-2) to
ON. Now when the power supply is turned on the status display will read one of the following:

LOCK - front panel controls locked, analog mode not enabled and no digital commands received.

aRwl (analog Remote with local lockout) - front panel controls locked, analog mode enabled

dRwl (digital Remote with local lockout) - front panel controls locked, analog mode disabled and

a digital command received.

Once the front panel is locked, it can only be unlocked by either of the following:

• turn the power supply off, set ANALOG I/O DIP switch position 5 to OFF, and then
power up again.

• send the following SCPI command via GPIB, RS232 or LAN port:

SYST:KLOC OFF

3-4 KLP031308

NOTE: If the front panel is unlocked by SCPI command, the unit will be set to Remote

with Local Lockout when it is turned on again. Set ANALOG I/O DIP switch posi­tion 5 to OFF to disable Remote with Local Lockout.

3.2.3 ENABLING/DISABLING OUTPUT POWER

When the power supply is turned on, the output is automatically disabled (DC OUTPUT LED is
off) and the DC VOLTS and DC AMPERES displays show the programmed output voltage and
current set points and the status display reads SET.

To disable the output, press and release the DC OUTPUT switch again. The DC OUTPUT indi­cator goes off.

While in the setpoint mode (Status display reads SET) the output cannot be turned on (pressing

DC OUTPUT has no effect). If output was on while setpoint mode was entered, pressing DC
OUTPUT will disable the output.

For setpoint adjustment refer to PAR. 3.2.7.2. To enable/disable the output using analog con­trol, refer to PAR. 3.4.1.

3.2.4 CHECKING VOLTAGE/CURRENT SETPOINTS

CAUTION: WHEN THE OUTPUT IS DISABLED, THE DC VOLTS AND DC AMPERES DIS-

PLAYS SHOW THE ACTUAL OUTPUT VOLTAGE AND CURRENT. BEFORE
ENABLING THE OUTPUT ALWAYS CHECK THE SETPOINTS TO AVOID POS­SIBLE DAMAGE TO THE LOAD.

Check the voltage and current set points by tapping either the VOLTAGE or CURRENT control.
The status display reads SET, and the DC VOLTS and DC AMPERES displays show the stored
setpoints.

To accept the displayed value, tap the associated adjustment control again. To change the
value, rotate the control (press the control in while rotating for fine adjustment), then tap the
adjustment control again to accept the new setting. If you decide not to change the value after
rotating the control, the previous setpoint value will be restored after about 20 seconds of inac­tivity, then tap either adjustment control to accept. If a fault has been configured for AUTO
recovery, the status display flashes >AUTO for one second upon leaving Setpoint mode (see
PAR 3.2.13.5.2).

3.2.5 PASSWORD PROTECTED FUNCTIONS

Certain functions, such as defining virtual model, system configuration, and calibration can only
be changed from the front panel after entering the unit password. Refer to PAR. 4 to change the
password. Table 4-1 shows the factory default password for each model.

1. The status display shows PASS (password) and the display shows 0000 with the left-most
character blinking. Rotate CURRENT control to select a number from 0-9. Tap CURRENT
control to advance to next digit.

2. Repeat this process until all four digits have been selected. Tap DC OUTPUT switch to
accept the number. If password is incorrect, the status display reads "ERR". Repeat this step
to enter the correct password, or press the FUNCTION switch to exit.

KLP031308 3-5

3.2.6 DEFINING A VIRTUAL MODEL

The virtual model is defined by establishing a maximum programmable voltage and current for
the unit within the 1200W power limitation and the maximum voltage and current ratings listed in
Table 1-1. Once established, the unit will not accept programmed values beyond these values
whether from the front panel in local mode, or from the digital (GPIB, RS232, or LAN) or analog
input ports in remote mode. The virtual model settings are password-protected (see PAR.

3.2.5).

A multitude of possible 1200W power supplies may be emulated by defining the maximum volt­age and current. For example, some of the possible power supplies that a KLP 36-60-1200 can
emulate are: 36V, 33A (1200W), 20V, 60A (1200W), 30V, 40A (1200W) and 35V, 30A (1050W).
Refer to Table 1-1 and Figure 1-2 for the acceptable operating regions for each model.

NOTE: Decreasing full scale voltage and/or current does not improve programming resolution.

Whenever a virtual model is set, overvoltage and overcurrent protect limits (see PAR. 3.2.8) are
reset to 120% of the new maximum value (except where necessary to maintain minimum values
as noted in PAR. 3.2.8). Also, if position 3 of the Analog I/O DIP switch is set to recall previous
setpoint values upon power-up (see Table 2-2 and PAR. 3.2.7.3), the previous setpoint value is
cleared so that after changing the virtual model the initial powerup will be at 0 Volts, minimum
current. In addition, the following parameters which are not accessible from the front panel (see
PAR. 3.3.2) should be checked to ensure that there are no settings outside the range permitted
by the new maximum programmable voltage and current.

• Storage of User-programmed Active Settings (Save/Recall).

• User-determined output Sequences.

• External Triggers: VOLT:TRIG and CURR:TRIG values

• Sequences programmed using LIST commands.

To define a virtual model, proceed as follows.

1. If the status display shows SET, tap either the CURRENT or VOLTAGE controls to take the
unit out of setpoint mode (status display goes from SET to blank)

2. Using a thin tool (e.g., a paper clip), press the FUNCTION switch once so that the status dis-
play reads VIRT. The DC VOLTS and DC AMPERES displays show the programmed maxi-
mum voltage and current of the virtual model. To exit without changing the virtual model,
rotate either VOLTAGE or CURRENT control until Status display reads EXIT, then tap DC
OUTPUT switch. To change the virtual model limits proceed to step 3.

3. Press the DC OUTPUT switch once. The status display shows PASS. Enter the unit pass­word (see PAR. 3.2.5) and tap DC OUTPUT switch to accept the number. When the pass­word is accepted, the virtual model settings in the DC VOLTS and DC AMPERES displays
begin blinking.

4. Rotate VOLTAGE and CURRENT controls until desired values appear in DC VOLTS and
DC AMPERES displays. Pressing and holding the control in while turning provides a finer
adjustment resolution. Under no conditions will the power supply accept limits beyond its
maximum ratings of voltage and current. As the primary parameter is increased, the power
supply will automatically decrement the secondary parameter as necessary to maintain max-

3-6 KLP031308

imum output power at 1200 Watts. Maximum current shown on DC AMPERES display is
automatically limited to 1200W maximum.

5. Press DC OUTPUT switch to accept virtual model settings. The unit displays done, then
resets and repeats the power on sequence (see PAR. 3.2.1).

NOTE: Accepting a new virtual model resets the setpoints to zero Volts and minimum

Amperes, resets the OVP and OCP values and, if DIP switch position 3 is enabled,
clears stored setpoints of voltage and current as described above.

3.2.7 SETTING VOLTAGE OR CURRENT

The VOLTAGE and CURRENT controls adjust output voltage and current limit, respectively,
when the unit is in constant voltage (CV) mode and adjust voltage limit and output current,
respectively, when the unit is in constant current (CC) mode. The mode (CV or CC) is deter­mined by the load together with the programmed settings. As long as the voltage across the
load produces a current that is less than the programmed Current setpoint, the unit operates in
CV mode (voltage programmed to voltage setpoint, current limited by current setpoint). If the
load changes to the point that current through the load reaches the current setpoint, the unit
automatically enters CC mode (current programmed to current setpoint, voltage limited by volt­age setpoint).

Output voltage or current can be set at the front panel in two ways: Real-time adjustment (PAR

3.2.7.1) or Setpoint adjustment (PAR. 3.2.7.2).

3.2.7.1 REAL-TIME VOLTAGE/CURRENT ADJUSTMENT

Rotating the associated control will change the output voltage or current in real-time only if the
output is enabled. If the unit is in constant voltage mode (CV indicator lit) the DC VOLTS display
shows the actual output voltage as the VOLTA G E control is rotated. Similarly, if the unit is in
constant current mode (CC indicator lit) the DC AMPERES display shows the actual output cur­rent as the CURRENT control is rotated.

NOTE: If the unit is in CV mode, rotating the CURRENT control will affect the current limit even

though the DC AMPERES display does not change since it is showing actual output
current. Similarly, rotating the VOLTAGE control while in CC mode affects the voltage
limit. To change the limits to a precise value, refer to PAR. 3.2.7.2, Setpoint Adjust­ment.

Voltage and current settings are not allowed to exceed either a) the virtual model setting or b)
80% of the protection value. Attempts to set voltage or current beyond these limits will not be
accepted. The status display shows either >MAX for virtual model limits, >OVP for voltage pro­tection, or >OCP for current protection to indicate which limit is being exceeded.

3.2.7.2 SETPOINT ADJUSTMENT

Tap either the VOLTAGE or CURRENT control to initiate setpoint adjustment (status display
reads SET). The previous setpoint is visible on the corresponding DC VOLTS or DC AMPERES
display.

1. Rotate the corresponding control to change the setpoint as viewed on the corresponding
LED display. If you decide not to change the setting after rotating the control, the previous
setpoint value is restored after approximately 20 seconds. Tap either adjustment control
again to accept the displayed setting.

KLP031308 3-7

2. In the setpoint mode, both coarse (rotate the control) and fine (rotate while pressing control
in) adjustment is available. The coarse adjustment is approximately 100X the fine adjust­ment resolution.

Setpoint adjust can be done with output either on or off, however the output can not be enabled
while setpoint is active (See PAR. 3.2.3).

Voltage and current settings are not allowed to exceed either a) the virtual model setting or b)
80% of the protection value. Attempts to set voltage or current beyond these limits will not be
accepted. The status display shows either >MAX for virtual model, >OVP for voltage protection,
or >OCP for current protection to indicate which limit is being exceeded. If a fault has been con­figured for AUTO recovery, the status display flashes >AUTO for one second upon leaving Set­point mode (see PAR 3.2.13.5.2).

3.2.7.3 LAST SETTING RECALL

KLP is capable of saving the last setpoint values for voltage and current prior to unit shutdown,
and recalling them when the unit is next turned on. Enable this function prior to power-up by set­ting Analog I/O Switch 3 to the ON (down) position (see Table 2-2 and Figure 2-2). Upon next
power-up, each setpoint entry for voltage and current is stored in non-volatile memory, with lat­est settings displacing prior ones. When the power supply is turned off, the last settings are
saved and automatically retrieved at next power-up as the starting setpoints. Note that this func­tion applies to setpoint entries only (PAR 3.2.7.2); output changes entered in real-time mode
(PAR 3.2.7.1) are not saved. To disable this function, turn the unit off and set Analog I/O Switch
3 to the OFF (up) position; at next power-up, the stored value buffer is cleared and setpoints will
default to zero volts and minimum current.

NOTE: If the virtual model for the power supply is altered, the last settings are reset to zero

volts and minimum current.

3.2.8 VIEWING/CHANGING OVERVOLTAGE OR OVERCURRENT PROTECTION VALUES

Overvoltage and Overcurrent protection values can be individually programmed. The range for
overvoltage and overcurrent values are 0.2 to 1.2 x E

O

max and 0.72 to 1.2 x IOmax. If the out­put voltage/current exceeds the overvoltage/overcurrent protection value, the protection circuit
latches the output off, flashes an overvoltage (OVP) or overcurrent (OCP) protection error mes­sage on the status display and sets a status bit that can be retrieved through the RS 232, GPIB
or LAN port. The unit must be cycled on and off to restore the output. If the internal relay is pro­grammed to FAULT mode (see PAR. 3.2.13.3), the N.O. and N.C. contacts of the relay provide
status flags via the Analog I/O port connector. The maximum values are 1.2 x E

O

max for over-

voltage protection, and 1.2 x I

O

max for overcurrent protection.

A built-in feature prevents the unit from being programmed within 20% of OVP or 20% of OVC.
For example, if OVP and OVC are set to 12V and 72A, respectively, programming of the output
is automatically limited to 10V and 60A.

NOTE: When a virtual model is defined (PAR. 3.2.6), OVP and OVC are automatically set 20%

and 20%, respectively, above the maximum programmable values established by the
virtual model. If OVP or OVC are lowered by the user, valid settings will actually be
lower than the virtual model limits because values within 20% of OVP or 20% of OVC
are prohibited.

The OVP and/or OVC limits can be changed as follows:

1. Using a thin tool (e.g., end of paper clip), press and hold the PROTECT switch. The output is

switched off, setting voltage to zero Volts, and current to a minimal value, and the status dis-

3-8 KLP031308

play shows PROT. The DC VOLTS and DC AMPERES displays show the corresponding
overvoltage and overcurrent protection setpoints while the PROTECT switch is held in.

2. To change the values, operate the corresponding adjustment control while holding the PRO-
TECT switch in. When the PROTECT switch is released, the protection values showing in
the DC VOLTS and DC AMPERES displays are entered as the new protection values.

3.2.9 CHANGING GPIB ADDRESS

The factory default GPIB address is 6. To change the address from the front panel proceed as
follows:

1. If the status display shows SET, tap either the CURRENT or VOLTAGE controls to take the
unit out of setpoint mode (status display goes from SET to blank)

2. Using a thin tool (e.g., a paper clip), press the FUNCTION switch once until the status dis­play reads VIRT. Rotate either the CURRENT or VOLTAGE control until the display reads
ADDR; the active GPIB address is visible in the DC AMPERES display. To change the
address, proceed to step 3.

3. Tap the DC OUTPUT switch once. The GPIB address visible in the DC AMPERES display
begins blinking.

4. Rotate the CURRENT control to change the GPIB address, then tap the DC OUTPUT switch
to accept the displayed GPIB address. The display briefly reads DONE, then returns to ADDR.

5. Rotate the VOLTAGE control until display reads EXIT, then tap the DC OUTPUT switch to
exit

3.2.10 CHANGING RS232 BAUD RATE [-1200 MODELS ONLY]

The factory default RS232 baud rate is 38400. To change the baud rate from the front panel
proceed as follows:

1. If the status display shows SET, tap either the CURRENT or VOLTAGE controls to take the
unit out of setpoint mode (status display goes from SET to blank)

2. Using a thin tool (e.g., a paper clip), press the FUNCTION switch once until the status dis­play reads VIRT. Rotate either the CURRENT or VOLTAGE control until the display reads
BAUD; the active baud rate x 1000 is visible in the DC AMPERES display (e.g., 38400 is dis-
played as 38.4). To change the baud rate, proceed to step 3.

3. Tap the DC OUTPUT switch once. The baud rate visible in the DC AMPERES display
begins blinking.

4. Rotate the CURRENT control to change the baud rate, then tap the DC OUTPUT switch to
accept the displayed baud rate. The display briefly reads DONE, then returns to BAUD.

5. Rotate the VOLTAGE control until display reads EXIT, then tap the DC OUTPUT switch to
exit

3.2.11 SETTING UP MASTER/SLAVE CONFIGURATIONS [-1200 MODELS ONLY]

Both units of a master/slave pair must be identical models. After connecting the RS 232 ports
(see PAR. 2.7.8), proceed as follows to configure the individual units to be master or slave.

KLP031308 3-9

3.2.11.1 CONFIGURE POWER SUPPLY AS MASTER [-1200 MODELS ONLY]

1. Turn power on. If the unit comes up in setpoint mode (see PAR. 3.2.4), tap either the CUR­RENT or VOLTAGE controls to take the unit out of setpoint mode (status display goes from

SET to blank).

2. Using a thin tool (e.g., a paper clip), press the FUNCTION switch once until the status dis­play reads VIRT. Rotate either the CURRENT or VOLTAGE control until the display reads
M/S.

3. Tap the DC OUTPUT switch once.

• The status display reads either SERI (series) or PARA (parallel).

•The DC VOLTS display shows the number assigned to the unit (1 = master, 2 or above
= slave).

•The DC AMPERES display shows the maximum number of units in the configuration.

• The factory default is standalone operation (DC VOLTS and DC AMPERES show 1).

4. To change the configuration tap the DC OUTPUT switch once. The DC VOLTS and DC
AMPERES start blinking.

• Specify either SERI (series configuration for higher voltage) or PARA (parallel configura­tion for higher current) using either the VOLTAGE or CURRENT control by holding in
and rotating the control. Both connected units must be set the same, either SERI or
PARA.

• Specify the total number of units in the configuration to 2 by rotating the CURRENT con­trol.

• Specify the unit number to be assigned (1 = master) by rotating the VOLTAGE control.

5. Press DC OUTPUT to accept the displayed settings. The unit briefly flashes WAIT, then
restarts with the new settings; press FUNCTION to abort without changing the settings.

NOTE: Until both units are configured properly, the displays will cycle as follows: status display

will flash E241 (hardware error), then DC VOLTS, status display and DC AMPERES
flash x OF y where x = unit number and y = total number of units, the status display
flashes the type of connection SERI (series) or PARA (parallel).

3.2.11.2 CONFIGURE POWER SUPPLY AS SLAVE [-1200 MODELS ONLY]

1. Turn power on. If the unit comes up in setpoint mode (see PAR. 3.2.4), tap either the CUR­RENT or VOLTAGE control to take the unit out of setpoint mode (status display goes from

SET to blank).

2. Using a thin tool (e.g., a paper clip), press the FUNCTION switch once until the status dis­play reads VIRT. Rotate either the CURRENT or VOLTAGE control until the display reads
M/S.

3. Tap the DC OUTPUT switch once.

• The status display reads either SERI (series) or PARA (parallel).

3-10 KLP031308

•The DC VOLTS display shows the number assigned to the unit (1 = master, 2 or above
= slave).

•The DC AMPERES display shows the maximum number of units in the configuration.

• The factory default is standalone operation (DC VOLTS and DC AMPERES show 1).

4. To change the configuration tap the DC OUTPUT switch once. The DC VOLTS and DC
AMPERES start blinking.

• Specify either SERI (series configuration for higher voltage) or PARA (parallel configura­tion for higher current) using either the VOLTAGE or CURRENT control by holding in
and rotating the control. Both connected units must be set the same, either SERI or
PARA.

• Specify the total number of units in the configuration to 2 by rotating the CURRENT con­trol.

• Specify the unit number to be assigned (2 = slave) by rotating the VOLTAGE control.

5. Press DC OUTPUT to accept the displayed settings. The unit briefly flashes wait, then
restarts with the new settings; press FUNCTION to abort without changing the settings.

NOTE: Until both units are configured properly, the displays will cycle as follows: status display

will flash E241 (hardware error), then DC VOLTS, status display and DC AMPERES
flash x OF y where x = unit number and y = total number of units, the status display
flashes the type of connection SERI (series) or PARA (parallel).

3.2.11.3 OPERATING THE MASTER/SLAVE CONFIGURATION [-1200 MODELS ONLY]

Once the master is configured, it searches for the slave specified. Until the slave is set up prop­erly, the master status display will cycle as follows: status display will flash E241 (hardware
error), then DC VOLTS, status display and DC AMPERES flash x OF y where x = unit number
and y = total number of units, the status display flashes the type of connection SERI (series) or

PARA (parallel). When the slave is found, the status display of the slave reads SLVE and the DC
VOLTS and DC AMPERES displays on the slave go blank. For the master/slave combination to

work properly the number of slave units specified in the master (PAR. 3.2.11.1, step 4) must be
found.

When the slave has been found, the master proceeds with the normal turn-on sequence and the
unit proceeds to SET mode. The master front panel readouts show the total values for set point,
voltage and current readback, virtual model (the virtual model and protection settings of the
slave are automatically programmed to be the same as the master) and protection settings for
the master/slave configuration. All controls on the slave are disabled. The parallel or series
combination is controlled from the master using either the front panel, SCPI commands, or ana­log control.

• If analog control is used, only the master is configured for analog control (the slave is
controlled digitally by the master).

• If Remote Inhibit is used, it should only be connected to the master.

KLP031308 3-11

• If E241 (hardware error) is showing in the status display, check the master and/or slave
setup. If necessary, use FUNCTION switch to enter the M/S menu to change the config­uration as described above.

• If there is no communication between units for approximately 10 seconds, all units will
turn off their output and the status display will flash E241 (hardware error), then xOFy
where x = unit number and y = total number of units, and finally the serial/parallel config­uration setting SERI or PARA.

3.2.12 LAN INTERFACE CONFIGURATION [-1.2K MODELS ONLY]

Using a thin tool (e.g. end of paper clip), press FUNCTION switch once until status display
reads VIRT, then rotate either VOLTAGE or CURRENT control until status display reads LAN.
Press DC OUTPUT switch to enter the LAN Interface configuration menu. Rotate either VOLT-
AGE or CURRENT control to see the available functions.

• LRST - LAN Reset. To restore the LAN interface configuration to the factory default,
rotate either VOLTAGE or CURRENT control to show YES in the DC VOLTS display,
then press DC OUTPUT switch. The factory default settings are listed in PAR. 3.3.1.3.

• DHCP - DHCP status is displayed in the DC VOLTS display. To change the setting press
DC OUTPUT switch, then rotate either VOLTAGE or CURRENT control to see desired
setting and press DC OUTPUT switch to save.

• ON - The KLP requests an IP address from the DHCP server. (AUTOIP set to
OFF.)

• OFF - The KLP uses the IP, MASK, GATE and DNS addresses established by
the user using either the UTIL - LAN menus at the front panel, the web interface
(see PAR. 3.3.6) or via SCPI commands over one of the digital interfaces.
(AUTO IP also set to OFF.)

• AUTO - AUTO IP status is displayed in the DC VOLTS display.

• ON - The KLP obtains an IP address automatically. (Both DHCP and AUTO IP
set to ON.)

• OFF - The KLP uses the IP, MASK, GATE and DNS addresses established by
the user using either the UTIL - LAN menus at the front panel or via SCPI com­mands. (AUTOIP set to OFF.)

• MAC1 - Shows first pair of hex digits of the MAC address (e.g., for MAC address 01-23­45-67-89-AB the DC VOLTS display shows 01- and the DC AMPERES display shows

23-). Cannot be changed by the user.

• MAC2 - Shows second of two hex digits of the MAC address (e.g., for MAC address 01-

23-45-67-89-AB the DC VOLTS display shows 45- and the DC AMPERES display
shows 67-). Cannot be changed by the user.

• MAC3 - Shows third pair of hex digits of the MAC address (e.g., for MAC address 01-23­45-67-89-AB the DC VOLTS display shows 89- and the DC AMPERES display shows
AB). Cannot be changed by the user.

• IP1 - Shows first half of IP address (e.g., for IP address 192.168.000.200 the DC
VOLTS display shows 192._ and the DC AMPERES display shows 168._). To change

3-12 KLP031308

the address, press DC OUTPUT switch, then rotate VOLTAGE control to change 192._
or CURRENT control to change 168._, then press DC OUTPUT switch to save.

• IP2 - Shows second half of IP address (e.g., for IP address 192.168.000.200 the DC
VOLTS display shows _000. and the DC AMPERES display shows _200). To change
the address, press DC OUTPUT switch, then rotate VOLTAGE control to change _000.
or CURRENT control to change _200., then press DC OUTPUT switch to save.

• MSK1 - Shows first half of SUBNET MASK address (see IP1 described above). Default is

255.255.

• MSK2 - Shows second half of SUBNET MASK address (see IP2 described above).
Default is 0.0

• GTE1 - Shows first half of GATE address (see IP1 described above).

• GTE2 - Shows second half of GATE address (see IP2 described above).

• DNS1 - Shows first half of DNS address (see IP2 described above).

• DNS2 - Shows second half of DNS address (see IP2 described above).

• RTN - Return to LAN menu.

3.2.13 UTILITY FUNCTION

The Utility Function provides additional system information or access to special functions.
These are described below.

1. If the status display shows SET, tap either the CURRENT or VOLTAGE controls to take the
unit out of setpoint mode (status display goes from SET to blank)

2. Using a thin tool (e.g., a paper clip), press the FUNCTION switch once until the status dis­play reads VIRT, then rotate either the VOLTAGE or CURRENT control in either direction
until status display reads UTIL.

3. Tap the DC OUTPUT switch once, then rotate either the VOLTAGE or CURRENT control in
either direction to select the function identified in the status display (see below).

• VERS - Display System Firmware Version (see PAR. 3.2.13.1)

• MODL - Display Model (see PAR. 3.2.13.2)

• RELY - Relay Control (see PAR. 3.2.13.3)

• QkBT - Quick Boot (see PAR. 3.2.13.4)

• SYST - System Configuration (see PAR. 3.2.13.5)

• INVC - Analog Input Voltage and Current A to D calibration voltages (see PAR. 3.2.13.6)

• LBT - [-1200 Models only] Loop Back Test used to isolate RS 232 communication prob-

KLP031308 3-13

lems (see KLP Developer’s Guide).

• CAL - Display last calibration date and/or begin Calibration (see PAR. 3.2.13.7)

• RTN - Exit any submenu and return to previous menu

3.2.13.1 DISPLAY SYSTEM FIRMWARE VERSION

Enter UTIL menu (see PAR. 3.2.13, steps 1 through 3) and rotate either VOLTAGE or CUR-
RENT control until status display reads VERS.

•The DC VOLTS display identifies whether the firmware is the factory shipped firmware
(Pri displayed) or field updated firmware (SEC displayed).

•The DC AMPS display shows the firmware version. This information can not be changed
directly by the user.

3.2.13.2 DISPLAY MODEL

Enter UTIL menu (see PAR. 3.2.13, steps 1 through 3) and rotate either VOLTAGE or CUR-
RENT control until status display reads MODL.

•The DC VOLTS display shows the model voltage rating (e.g, 75.00 for KLP 75-33-1200).

•The DC AMPS display shows the model current rating (e.g, 33.34 for KLP 75-33-1200).
This information can not be changed by the user.

3.2.13.3 INTERNAL RELAY CONTROL

The internal relay contacts available at pins 6, 7 and 8 of the Analog I/O connector can be con­figured from the front panel to operate in either Fault, Manual or List mode. If FAULT mode (the
factory default) is selected, the relay energizes automatically upon detection of a user-selected
condition. The selections are a) NORM (normal), a system fault (see PAR. 1.4.9), b) V->C, when
the unit transitions from Constant Voltage (CV) to Constant Current (CC) mode, or c) C->V,
when the unit transitions from CC to CV mode. If V->C (or C->V) is selected, the amount of
time the unit must be in CC (or CV) mode before the relay energizes may be programmed from
the front panel (see step 2a) or using the SCPI command OUTP:PROT:DEL (see KLP Devel­oper’s Guide).

1. Enter UTIL menu (see PAR. 3.2.13, steps 1 through 3) and rotate either VOLTAGE or CUR-
RENT control until status display reads RELY. The DC VOLTS display indicates whether the
relay is currently ON (energized) or OFF (deenergized). Tap DC OUTPUT switch to enter
Relay Control menu.

• Rotate either VOLTAGE or CURRENT control to see the available relay control modes
in the status display. The modes are:
FLT (factory default) - Relay is set to energize automatically upon detection of one of
three preselected conditions:

NORM: (factory default) relay energizes immediately upon detection of a system

(fatal) error:

V->C: relay energizes immediately upon detection of a system (fatal) error and,

3-14 KLP031308

after a user-programmable delay, the relay energizes upon a transition
from constant voltage (CV) to constant current (CC) mode.

C->V: relay energizes immediately upon detection of a system (fatal) error and,

after a user-programmable delay, the relay energizes upon a transition
from constant current (CC) to constant voltage (CV) mode.

RTN: Return to FLT menu.

MAN - Relay on/off is controlled manually, directly from the front panel (see below).

Relay state is not retained; relay will be off when unit is turned on

LIST - Relay on/off is controlled remotely using LIST commands via GPIB or RS 232
interface (see KLP Developer’s Guide).

RTN - Return to RELY menu.

2. To select mode rotate either VOLTAGE or CURRENT control until status display reads FLT
(factory), MAN (manual), or LIST. Then press DC OUTPUT switch to save selection.

a. If FLT is selected, rotate VOLTAGE or CURRENT control to select NORM, V->C, or

C->V. in the status display.

(1) To select NORM, tap the DC OUTPUT switch to save selection; unit returns to RELY

menu.

(2) To select V->C or C->V, first set the delay. While V->C or C->V is in the status dis-

play, the DC AMPERES display shows the delay in seconds, from 000.5 to 128.0:
NNND, where NNN is an integer from 0 to 128 and D will be either .0 or .5 (000.0 is
not permitted). The delay determines the length of time that the unit must be operat­ing in the new mode before energizing the relay.

The factory default delay time is set to 1.0 seconds to prevent false tripping of the
relay during application of output power to low impedance or highly reactive loads. If
false tripping occurs, this delay may be increased as needed.

To change the delay, press in and rotate either the VOLTAGE or CURRENT con-
trol; release the control when the DC AMPERES display shows the desired delay.
Tap the DC OUTPUT switch to save selection; unit returns to RELY menu.

NOTE: Once the relay turns on in V->C or C->V mode, the relay will go off again when the

unit transitions back to the original mode, or when the output is turned off.

b. To select MAN, tap the DC OUTPUT switch to save selection. If MAN is selected, the DC

VOLTS display shows whether the relay is ON or OFF. To change the state of the relay
press in and rotate either VOLTAGE or CURRENT control until the desired relay state
is displayed, then release the control. Tap the DC OUTPUT switch to immediately set
the relay to the selected state and return to the RELY menu.

c. To select LIST, tap the DC OUTPUT switch to save selection; unit returns to the RELY

menu

3. Rotate either VOLTAGE or CURRENT control until status display shows RTN and press DC
OUTPUT switch to exit UTIL menu, then rotate either VOLTAG E or CURRENT control until
status display shows EXIT and press DC OUTPUT switch to exit FUNCTION control.

KLP031308 3-15

NOTE: If a SYSTem:SECurity:IMMediate command is issued, the above relay control settings

are reset to the factory default: FLT - NORM.

3.2.13.4 QUICK BOOT

Enter UTIL menu (see PAR. 3.2.13, steps 1 through 3) and rotate either VOLTAGE or CUR-
RENT control until status display reads QkBT - Quick Boot. If Quick boot is ON, then the next

time the unit is powered up it will go directly to setpoint mode (status display reads SET, see
PAR. 3.2.7) without displaying MODL, VIRT, and PROT settings.

•The DC VOLTS display indicates whether quick boot is ON or OFF.

1. Tap the DC OUTPUT switch to change the setting. The DC VOLTS display begins to blink.

2. Rotate either VOLTAGE or CURRENT control until the desired quick boot state is displayed,
then tap the DC OUTPUT switch to save the setting; the blinking stops.

3. To exit, rotate either VOLTAGE or CURRENT control until the status display reads RTN,
then tap the DC OUTPUT switch. To exit the UTIL menu rotate either VOLTAGE or CUR-

RENT control until the status display reads EXIT, then tap the DC OUTPUT switch.

3.2.13.5 SYSTEM CONFIGURATION FUNCTIONS

The system configuration functions allow the user to determine 1) whether the Remote Inhibit
signal is an active TTL high or low and 2) how the unit recovers from a fault. The unit password
is required to change these functions.

1. Enter UTIL menu (see PAR. 3.2.13, steps 1 through 3) and rotate either VOLTAGE or CUR-
RENT control until status display reads SYST.

2. Tap the DC OUTPUT switch to enter the System Configuration Functions menu.

3.2.13.5.1 REMOTE INHIBIT CONFIGURATION

The Remote Inhibit signal REM_INH is applied to analog I/O port, pin 8 (see PAR’s. 2.7.9 and

3.4.1). This signal can be configured to be active (inhibit the output) for either a TTL high or low.

1. Enter UTIL menu (see PAR. 3.2.13, steps 1 through 3) and rotate either VOLTAGE or CUR-

RENT control until status display reads SYST, then tap DC OUTPUT switch. Rotate either
VOLTAGE or CURRENT control until the status display reads rINH and the DC VOLTS dis-

play reads either Hi or Lo.

2. To change the remote inhibit setting, tap the DC OUTPUT switch. The status display shows
PASS. Enter the unit password (see PAR. 3.2.5) and tap DC OUTPUT switch to accept the
number. When the password is accepted, the status display reads rINH and DC VOLTS dis­play is blinking.

3. Rotate either VOLTAGE or CURRENT control until DC VOLTS display reads desired set-
ting, then tap DC OUTPUT switch to accept.

4. Tap FUNCTION switch to exit or rotate VOLTAGE or CURRENT control until status display
reads RTN, then tap DC OUTPUT switch to return to next highest menu.

3-16 KLP031308

3.2.13.5.2 FAULT RECOVERY CONFIGURATION

The KLP allows the user to control how the unit recovers from faults, and allows different
responses for different faults. This function is password-protected. The three recovery options
are PROT, SAFE and AUTO.

• PROTected - When a fault configured as PROT is detected, the output is disabled.
Recovery requires that the user turn the unit off and wait five seconds before turning the
unit on. After initializing, the output is disabled and the unit is in Setpoint mode, pro­grammed to 0 Volts, minimum current, except that if last setting recall (PAR. 3.2.7.3) is
enabled, the Setpoint values are from the last setting. This is the safest recovery option,
forcing the operator to reboot the power supply before programming and re-enabling the
output, hopefully after eliminating the cause of the fault. PROT is the factory default set­ting for all fault recoveries.

• SAFE - When a fault configured as SAFE is detected, the output is disabled and the unit
is returned to Setpoint mode (programmed to zero volts, minimum current); if last setting
recall (PAR. 3.2.7.3) is enabled, the Setpoint values are from the last setting. Recovery
requires that the user exit Setpoint mode and re-enable the output, either from the front
panel or via one of the digital programming ports. Recovery cannot be initiated by tog­gling the remote inhibit line at the analog programming port. This option provides greater
operator convenience by eliminating the need to reboot the power supply while preserv­ing a safe response (output off), but it is the user’s responsibility to NOT attempt multiple
consecutive restarts without eliminating the fault condition.

• AUTOmatic - When a fault configured as AUTO is detected, the output is disabled as
long as the fault condition exists. When the fault condition is no longer present (e.g., the
unit has cooled after an OTP overtemperature fault) the output returns to its last state
(OFF or ON) and the unit is programmed to zero volts, minimum current, except if last
setting recall (PAR. 3.2.7.3) is enabled, the unit is programmed to match the last setting.
While offering the greatest convenience to the user, this option represents the highest
risk because the output can reappear without warning when the fault condition clears. To
alert the user to this risk, if any fault is set to AUTO recovery, the status display briefly
shows AUTO after a) any fault recovery, b) any output enable action or c) upon leaving
Setpoint mode. In addition, if AUTO recovery is selected for source power failure (PWR)
faults, the status display flashes AUTO for one second as part of the power-up sequence.

If more than one fault occurs, the fault with the lowest risk level determines the unit’s response,
however multiple faults will cause the output to be off upon recovery, even if set to AUTO.

The factory default configuration is PROTECT for all faults. Note that some faults have limited
options. The recovery options for each fault are:

• OVP (Overvoltage Protection fault) PROTECT or SAFE

• OCP (Overcurrent Protection fault) PROTECT or SAFE

• OLF (Output Lead Fault) PROTECT or SAFE

• TEMP (Temperature fault) PROTECT, SAFE or AUTO

• PWR (Loss of source power fault) PROTECT, SAFE or AUTO

• FAN (Fan failure fault) PROTECT (not configurable)

KLP031308 3-17

1. Enter UTIL menu (see PAR. 3.2.13, steps 1 through 3) and rotate either VOLTAGE or CUR-

RENT control until status display reads SYST, then tap DC OUTPUT switch. Rotate either
VOLTAGE or CURRENT control to until the status display reads RCOV.

The DC VOLTS and DC AMPERES displays show a series of bars that give a snapshot pic-
ture of the recovery configuration as defined in Figure 3-1. The location of the bar (top, mid­dle, or bottom) corresponds to the risk level (high for AUTO, middle for SAFE, and low for
PROTECT). The character positions are assigned to the configurable faults as shown.

FIGURE 3-1. FAULT RECOVERY CONFIGURATION DISPLAY

2. To change a fault recovery setting, tap the DC OUTPUT switch to enter the Recovery menu.

3. The status display shows PASS. Enter the unit password (see PAR. 3.2.5) and tap DC OUT-
PUT switch to accept the number. When the password is accepted, status display reads OVP
and the DC VOLTS display shows the present fault recovery status (PROT or SAFE) for OVP.
Rotate either VOLTAGE or CURRENT control to cycle through OVP, OCP, OLF, TEMP, and
PWR settings. To exit tap the DC OUTPUT switch while the status display shows RTN.

4. To change a setting, tap the DC OUTPUT switch while the status display shows the fault.
The setting in the DC VOLTS display begins to blink. Rotate either VOLTAGE or CURRENT
control to cycle through the allowable settings. Tap the DC OUTPUT switch to accept the
setting shown in the DC VOLTS display.

5. To continue, rotate either VOLTAGE or CURRENT control to select another fault. To exit,
either select RTN and tap the DC OUTPUT switch to go to the next highest menu, or tap the

FUNCTION switch to exit function mode.

3.2.13.6 ANALOG INPUT FULL SCALE CALIBRATION

Enter UTIL menu (see PAR. 3.2.13, steps 1 through 3) and rotate either VOLTAGE or CUR-
RENT control until status display reads INVC.

•The DC VOLTS display shows the analog input voltage value that produces the full
scale output voltage established by the virtual model.

•The DC AMPS display shows the analog input voltage value that produces the full scale
output current established by the virtual model.

1. To change the settings tap the DC OUTPUT switch.

2. Rotate VOLTAGE control to set the analog voltage value required to produce the full scale
output voltage (for fine adjustment press in VOLTAGE control and hold while rotating).

3. Rotate the CURRENT control to set the analog voltage value required to produce the full
scale output current (for fine adjustment press in CURRENT control and hold while rotating).

NOTE:
THE FOLLOWING SETTINGS ARE SHOWN:

PWR SET TO AUTO
TEMP SET TO AUTO
OLF SET TO PROTECT
OCP SET TO PROTECT
OVP SET TO SAFE

3-18 KLP031308

4. Tap the DC OUTPUT switch to accept the new settings (blinking stops) or use a thin tool
(e.g., a paper clip) to press the FUNCTION switch to cancel the operation.

5. To exit, rotate either VOLTAGE or CURRENT control until the status display reads RTN,
then tap the DC OUTPUT switch. To exit the UTIL menu rotate either VOLTAGE or CUR-

RENT control until the status display reads EXIT, then tap the DC OUTPUT switch.

3.2.13.7 CALIBRATION

Refer to PAR 4.3.

3.3 REMOTE MODE PROGRAMMING USING DIGITAL INTERFACES

For digital remote programming refer to the KLP Developer’s Guide.

3.3.1 FACTORY DEFAULT SETTINGS

3.3.1.1 GPIB FACTORY DEFAULTS

The factory default GPIB address is 6; refer to PAR. 3.2.9 to change the GPIB address.

3.3.1.2 RS 232 FACTORY DEFAULTS [-1200 MODELS ONLY]

The factory default RS 232 settings are as follows; refer to PAR. 3.2.10 to change the RS 232
baud rate (-1200 Models only):

• Baud rate: 38400

• Parity: None

•Data Bits8

• Stop Bits 1

•Echo OFF

• XON ON (enabled) NOTE: Kepco strongly recommends the XON XOFF method
for data transfer via RS 232 protocol for all Kepco products. If this method is
not selected, it is the user's responsibility to ensure completion of any
response by the power supply prior to issuance of subsequent commands.

3.3.1.3 LAN FACTORY DEFAULTS [-1.2K MODELS ONLY]

The factory default LAN interface settings are listed below. Factory default setting can be
restored using the LAN Reset function (front panel only) or configured as desired from either the
front panel (see PAR. 3.2.12) or the web interface (see PAR. 3.3.6.3 )

• DHCP: ON

• AUTOIP: ON

• PING: ON (can only be changed through web interface)

• IP Address: Undefined

• MASK Address: 255.255.0.0

• GATE Address: 0.0.0.0

• DNS Address: 0.0.0.0

KLP031308 3-19

3.3.2 ADDITIONAL FUNCTIONS NOT AVAILABLE FROM THE FRONT PANEL

Some additional functions are described in the KLP Developer’s Guide that are not available
from the front panel:

• Storage of User-programmed Active Settings - 40 memory locations are available to
store and recall active settings of the power supply. The active setting include voltage,
current, protection limits, and output state (ON or OFF) This feature may be also
accessed using the web interface (-1.2K models only, see PAR. 3.3.6.5.3).

• User-determined output Sequences - Up to 100 memory locations are available for pro­gramming the KLP output using multiple command sequences that can be initiated by a
single LIST command (see KLP Developer’s Guide). This feature may be also accessed
using the web interface (-1.2K models only, see PAR. 3.3.6.5.5).

• External Triggering - If external trigger mode is selected, grounding the EXT_TRG line
(J2 pin 14 to pin 9, 11, 13 or 15) allows SCPI commands to change the output of the
power supply. Refer to the KLP Developer’s Guide for details on the use of triggering.

Kepco provides three instrument drivers, IVI-COM, LabView G and VXI plug&play which sim­plify programming of the KLP power supply via the digital interfaces. These drivers are
described in the KLP Developer’s Guide and can be downloaded from the Kepco web site at:
http://www.kepcopower.com/drivers/

3.3.3 REMOTE PROGRAMMING USING THE IVI-COM INSTRUMENT DRIVER

The IVI-COM driver for KLP is available for download at the Kepco web site www.kepco­power.com/drivers. Examples are provided in the KLP Developer’s Guide.

3.3.4 REMOTE PROGRAMMING USING THE LABVIEW G INSTRUMENT DRIVER

The LabView G driver for KLP, available for download at the Kepco web site www.kepco­power.com/drivers, includes a LabView G demonstration program that greatly simplifies pro­gramming the unit with a Windows™ compatible computer. After running a setup, a “soft” front
panel is visible on the computer monitor that allows all the functionality of the local front panel.
The LabView G soft front panel controls are explained in the KLP Developer’s Guide.

3.3.5 REMOTE PROGRAMMING USING THE VXI plug&play INSTRUMENT DRIVER

The VXI plug&play driver for KLP, available for download at the Kepco web site www.kepco­power.com, includes a demonstration program that greatly simplifies programming the unit via
the GPIB or RS 232 ports with a Windows™ compatible computer. After running a setup, a
“soft” front panel is visible on the computer monitor that allows all the functionality of the local
front panel. The VXI plug&play soft front panel controls are explained in the KLP Developer’s
Guide.

3.3.6 REMOTE PROGRAMMING USING THE WEB INTERFACE [-1.2K MODELS ONLY]

Remote programming of the KLP via the LAN port can be accomplished using a standard web
browser connected to the internet.

The factory default LAN settings of the KLP are DCHP on, AUTOIP on. When the power supply
is turned on, it tries to find a DCHP server and get an IP address while the LAN indicator blinks
rapidly. If the server is not found after 10 seconds, the unit will use AUTOIP to get an address. If
an IP address is found, the LAN indicator stays on without blinking. If an IP address is not found,

3-20 KLP031308

the LAN indicator stays off. The FUNCTION/LAN menu (see PAR. 3.2.12) can be used to view
the IP address that was found, or change it if desired.

3.3.6.1 FINDING KEPCO POWER SUPPLIES ON THE LAN [-1.2K MODELS ONLY]

The PSfind utility is supplied on the CD that comes with the unit, or can be downloaded from the
Kepco web site at www.kepcopower.com/drivers. This utility finds all operational Kepco power
supplies connected to the LAN and then shows the pertinent addresses of the models found. To
run the utility from your PC go to \utilities on the CD. This directory only contains one file
psfind.exe. Copy the file to your computer or run it directly from the CD itself. A separate window
opens as shown on Figure 3-2.

FIGURE 3-2. PS FIND SCREEN

Once the search is completed, all found units are displayed in the Select a Unit window (the
MAC address appears in parentheses); highlighting one of the units found will load that unit's IP,
Network Mask, Gateway and DNS addresses in the NDK Settings on the left side of the window.
If you do not see your device in the Select a Unit window, make sure it is turned on and con­nected to the network, then click the Search Again button.

• To set a static IP address, enter the static address in the IP ADDRESS field and the
Mask address in the Network Mask field (Figure 3-3 shows a the IP Address, Network
Mask and Gateway changed from that shown in Figure 3-2), then highlight the desired
unit and click the Set button. There will be a short pause while parameters are updated.
If you do not see your device in the “Select a Unit” window, make sure it is turned on and
connected to the network, then click the Search Again button.

• To set DHCP to ON, enter an IP ADDRESS of 0.0.0.0, then highlight the desired unit
and click the Set button. After a few seconds, click Search Again, highlight the desired
unit and click the Set button.

The Baudrate pull-down menu and Advanced button are provided for debug of the unit, provid­ing access to some internal registers of the interface. Changes in these registers may cause the
unit to become inoperative until power up of the unit occurs. These changes are only temporary,
and are overwritten when the next time the KLP is powered up.

KLP031308 3-21

FIGURE 3-3. SETTING A STATIC IP ADDRESS

3.3.6.2 LAUNCH WEB INTERFACE [-1.2K MODELS ONLY]

Click the Launch Webpage button to open the KLP Instrument HOME PAGE (UNIT DESCRIP­TION) in your default browser (see Figure 3-4). You can also launch the web page in any
browser by entering the IP address as the URL.

NOTE: If source power to the KLP is removed or lost while a browser window is open, commu-

nication with the KLP can not be restored until the present browser window is closed
and a new window is opened.

Although most current browsers will work, Kepco recommends the following as fully supported:
IE 5.5 and higher, Netscape 6 and higher and Firefox 1.0 and higher. Popup blocking must be
disabled and Javascript must be enabled for proper operation. If Popup blocking is enabled, it
may prevent viewing of the help screens.

FIGURE 3-4. WEB INTERFACE HOME PAGE (UNIT DESCRIPTION)

3-22 KLP031308

The KLP Instrument Home page identifies the unit which has been accessed, including Manu­facturer, Instrument, Description, Serial Number, Calibration Date, LXI Software Revision, LXI
Class, LXI Version, Hostname, MAC Address and TCP/IP Address. Click the HELP box at the
left of the screen for detailed explanations of each. These parameters can not be changed by
the user. Fault alerts are not available from this page

Clicking the ID INSTRUMENT box at the left of the screen, causes the physical front panel LAN
indicator on the selected unit to blink, allowing visual confirmation as to which unit is selected.
This is especially important if more than one unit is found on the LAN.

3.3.6.3 INSTRUMENT CONFIGURATION USING WEB INTERFACE [-1.2K MODELS ONLY]

Click on CONFIGURE INSTRUMENT at the left to view the INSTRUMENT Configuration page
(Figure 3-5). The parameters that can be configured from this page are arranged in two groups.

The top group requires the unit password to change the parameter and includes:

• Whether the polarity of the Remote Inhibit signal is active (inhibit) for low or high (see
PAR. 3.2.13.5.1 for details).

• How the unit recovers from faults (see PAR. 3.2.13.5.2 for details).

The second group does not require a password, and includes

• GPIB address.

• Quick boot (see PAR. 3.2.13.4 for details).

• Assignment of the internal relay (see PAR. 3.2.13.3 for details).

FIGURE 3-5. WEB INTERFACE CONFIGURE INSTRUMENT PAGE

KLP031308 3-23

3.3.6.4 LAN CONFIGURATION USING WEB INTERFACE [-1.2K MODELS ONLY]

Click on CONFIGURE LAN at the left to view the LAN Configuration page (Figure 3-6). The
parameters that can be configured from this page are Host Name (DHCP), Description, IP
Address, Subnet Mask address, Default Gateway Address, and DNS Server Address. Separate
checkboxes allow enabling of DHCP, AUTOIP and PING. Descriptions of these terms can be
viewed by clicking the HELP box at the left. If a fault condition exists, an alert window indicates
the type of fault. Click OK to close the window; the SUBMIT button is disabled until the fault is
corrected.

There are three passwords shown on this page which control access to the web pages only (not
to be confused with the unit password (see PAR. 3.2.5) which is needed for calibration, chang­ing virtual model, etc.).

NOTE: In cases where multiple users are expected to have access to the units, it is recom-

mended that password access be used to restrict control of the unit to one user (func-
tioning as a bus controller), while allowing other users viewing access. Allowing
multiple users to issue commands to a single unit can cause unpredictable results and
may cause the unit to lock up.

• The OPERATE INSTRUMENT password restricts the ability to view the OPERATE
INSTRUMENT page.

• The CONFIGURE INSTRUMENT password restricts the ability to change some
INSTRUMENT configuration parameters shown on the CONFIGURE INSTRUMENT
page.

• The CONFIGURE LAN password restricts the ability to change the LAN configuration
parameters shown on the CONFIGURE LAN page (Figure 3-6.)

The factory default is that passwords are not needed to access password-protected areas and
none of the three passwords have been established. To set a password for the first time, leave
the CURRENT field blank, enter the new password in the NEW and REPEAT fields, then click
SUBMIT. Subsequent changes require the current password to be entered in the CURRENT
field. If a password is lost or forgotten, the factory default state (no password required) can be
restored from the front panel using the LAN Reset function (see PAR. 3.2.12).

To change a parameter, enter the correct data and click the appropriate checkboxes, then click
SUBMIT. If the data is not entered within 20 seconds after the last keystroke, the data will revert
to the previous value. If the LAN CONFIGURATION password was set, you will be prompted to
enter the password before the changes are accepted.

When SUBMIT is clicked after new IP address information is entered, the front panel LAN indi­cator blinks rapidly while the unit validates the IP address. If the address is valid, the browser
returns to the INSTRUMENT DESCRIPTION page. If the address entered is already in use, the
following note appears towards the top of the page:

NOTE: IP Address is in use.

Click CONFIGURE LAN and choose another IP to correct.

An IP address that is not already in use must be entered and submitted, otherwise the browser
will lock, requiring the browser to be closed and reopened.

3-24 KLP031308

FIGURE 3-6. WEB INTERFACE CONFIGURE LAN PAGE

3.3.6.5 OPERATING THE UNIT USING WEB INTERFACE [-1.2K MODELS ONLY]

To operate the unit, click the OPERATE INSTRUMENT box at the left. A simulated front panel
at the top of the screen shows 1) output voltage and current, 2) CV or CC if the unit is in con­stant voltage or constant current mode, respectively (** is displayed if the output is off, meaning
the unit is in neither CV nor CC mode), and 3) whether the output is on or off. An ON/OFF button
can be clicked to turn the output on or off. A small white dot below the voltage display flashes to
indicate the web page is communicating with the unit. If a fault condition exists, an alert window
indicates the type of fault, and operation via the web is disabled. When the fault is corrected,
click OK to close the alert window and resume operation via the web.

NOTE: If the OPERATE INSTRUMENT password has been set (see PAR. 3.3.6.3), you will be

prompted to enter the password before the OPERATE INSTRUMENT page can be
viewed.

If the unit has been set to Analog control mode, the OPERATE INSTRUMENT page displays
only voltage, current, CV or CC mode, and output state. The unit can not be controlled via the
LAN interface and the message "Analog Remote Control" is displayed on the open web page.

The functions that the user can modify are listed on the black menu bar below the representa­tion of the front panel: Output, Protection, Save/Recall, Reset, List, and Virtual Model, and are
described in the following paragraphs.

NOTE: Once data in a field has been changed, if the data is not entered within 20 seconds, the

data will revert to the previous value.

KLP031308 3-25

FIGURE 3-7. WEB INTERFACE OPERATE INSTRUMENT PAGE

3.3.6.5.1 CHANGING THE OUTPUT [-1.2K MODELS ONLY]

The Output dialog box opens when the OPERATE INSTRUMENT page is first opened, or when
OUTPUT is clicked (see Figure 3-7). To set output voltage or current, enter the values and click
SET. Voltage and current settings are not allowed to exceed either a) the virtual model setting or
b) 80% of the protection value. Attempts to set voltage or current beyond these limits will not be
accepted. To turn the output on or off, click the ON/OFF button within the simulated front panel.

3.3.6.5.2 CHANGING PROTECTION [-1.2K MODELS ONLY]

Click PROTECTION to open the Protection dialog box (Figure 3-8). To set the overvoltage and
overcurrent protection values, enter the values and click Set. See PAR. 3.2.8 for details about
how overvoltage and overcurrent protection function in the KLP power supply.

FIGURE 3-8. PROTECTION DIALOG BOX

3.3.6.5.3 USING SAVE AND RECALL [-1.2K MODELS ONLY]

The KLP Power Supply contains 40 memory locations that can be used to store either active
settings or a set of user-determined settings. Values are stored in the nonvolatile memory and
are retained when the unit is turned off. The stored settings can then be recalled using this fea-

3-26 KLP031308

ture. These settings are cleared when a calibration is performed. Click SAVE/RECALL to open
the Save/Recall Dialog Box (Figure 3-9).

FIGURE 3-9. SAVE/RECALL DIALOG BOX

NOTE: When the SAVE/RECALL tab is initially selected, parameters for all locations appear

as empty even when there are values stored from previous sessions. Click the Pre-
view button first to avoid overwriting existing data.

• To view currently stored settings: Enter a location (1 to 40) in the box between Save @
and Preview buttons, then click Preview button.

• To change currently stored settings: Enter a location (1 to 40) in the box between Save @
and Preview buttons, then click Preview button. Modify the settings and click Save @ button
to save the modified settings.

• To save the active settings: Enter the desired location (1 to 40) in the LOCATION box and
click Save State button to save the active settings. Only the parameters shown in Figure 3-7
can be saved.

• To save user-determined settings: Enter location (1 to 40) in the box between Save @ and
Preview buttons. Enter desired values for Voltage, Current, Overvoltage Protection and
Overcurrent protection. Select whether the output is to be on or off, then click Save @ button
to save the settings

• To Recall settings: Enter the desired location in the LOCATION field and click Recall State
to set previously stored settings as the active settings.

If a virtual model setting is changed, and a stored setting is outside the range established by the
new virtual model, the data set is not loaded; although there is no indication on the web page,
the Status Display of the power supply will flash E221, "Settings conflict.

KLP031308 3-27

3.3.6.5.4 RESETTING THE UNIT (*RST) [-1.2K MODELS ONLY]

Click *RST button to reset power supply to the power on default state: setpoints to zero Volts
and minimum Amperes (see NOTE, PAR. 3.2.1, step 3, and Table 1-2), and output set to OFF,
except that if last setting recall (PAR. 3.2.7.3) is enabled, the Setpoint values are from the last
setting. *RST also clears all LIST entries.

FIGURE 3-10. RESET DIALOG BOX

3.3.6.5.5 USING A LIST (USER-PROGRAMMED SEQUENCES) [-1.2K MODELS ONLY]

Using the LIST feature, up to 100 locations are available for programming the KLP output.
These locations enable the user to program the output using sequential steps which may be ini­tiated by a single command. The repeatable user-determined sequences are stored in volatile
memory and are retained until reprogrammed, the power supply is turned off, a calibration is
performed, or a LIST:CLEar command is received. If a virtual model setting is changed, and a
programmed value is outside the range established by the new virtual model, that step is exe­cuted as the default minimum (zero V, minimum A) although the location contents are not
changed.

Create the List. Click LIST to open the List dialog box (Figure 3-11). Each location defines the
values for one step: voltage and current, and a dwell time duration (between 0.5 and 655.36
seconds); dwell times down to 0.01 second can be obtained using SCPI commands to generate
the list). (Note the state of the internal relay can be stored using the VXI plug&play driver or
SCPI LIST commands, but can not be controlled from the web interface). Click Add to List but­ton to add a step (the information in the Voltage, Current and Dwell boxes) to the List steps
shown to the right.

FIGURE 3-11. LIST DIALOG BOX

3-28 KLP031308

Clearing the List. Once a step has been added, it can not be changed and can only be deleted
by pressing the Clear List button to start over. In addition, performing any of the following oper­ations will also clear the list: changing overcurrent or overvoltage PROTECTION settings, unit
RESET (clicking *RST), changing VIRTUAL MODEL settings and exiting the OPERATE
INSTRUMENT page.

Create Voltage or Current Ramps. In addition to adding single steps, the user may add multi­ple steps to produce voltage or current ramps. Clicking the Voltage Ramp or Current Ramp
button opens similar dialog boxes (see Figure 3-12). Enter the starting and ending ramp values,
the number of intermediate steps (including start and end), the total time (in seconds) to go from
the start to the end of the ramp, and a constant current (for voltage ramp) or voltage (for current
ramp) for each step of the ramp. Clicking the Create Ramp button adds the steps to the list as
the firmware calculates the intermediate voltage values and dwell times required to produce the
desired ramp (calculated dwell times for each step must be greater than 0.5 second). Ramps
with many total steps may take a few seconds to process; the percentage complete is indicated
below the Create Ramp button.

FIGURE 3-12. ADDING MULTIPLE STEPS (RAMPS) TO LIST

Execute the List. Steps may be added to a list using Add to List, Current Ramp or Voltage

Ramp buttons, however the total number of steps can not exceed 100. To execute the list, enter
the number of times the list is to be executed in the Loops box (0 is continuous), set the output
on (click the On/Off button if necessary) and click the Execute List button. While the list is run-
ning, the title of the Execute List button changes to Stop Execution.

Stop the List. If the Stop Execution button is clicked to stop the list, the output stays on and
the voltage/current are returned to the previously set values for Output. If the list is stopped by
clicking the *RST button, the output turns off and Output setpoints are reset to 0V, minimum
current, except that if last setting recall (PAR. 3.2.7.3) is enabled, the Setpoint values are from
the last setting.

3.3.6.5.6 SETTING VIRTUAL MODEL [-1.2K MODELS ONLY]

Refer to PAR. 3.2.6 for details about what Virtual Model means for KLP and how the virtual
model affects other parameters. Click Virtual Model to open the Virtual Model dialog box (Fig-
ure 3-13). The current virtual model settings (gray) are displayed. To change the settings enter
the Unit Password (see PAR. 4) and press ENTER key on the computer keyboard. After the
password is accepted, the Unit Password field is inaccessible (gray) and the Maximum Voltage
and Maximum Current fields can be changed. Enter either maximum voltage or maximum cur­rent; the other field will be filled in automatically for a maximum of 1200 Watts, then press
ENTER key; all fields are gray for a second or two while the power supply accepts each entry.
The Password field is reset after leaving the Virtual Model dialog box

KLP031308 3-29

Setting a new virtual model resets the setpoints to zero Volts and minimum Amperes and resets
the OVP and OCP values to 120% of virtual model maximum. A minimum programmed current
is required to ensure proper operation of the power supply under all load conditions. Pro­grammed current is automatically set to be at least the minimum current (actual value depends
on model, see Table 1-1). If DIP switch position 3 is enabled (see Table 2-2), stored setpoints
for voltage and current are cleared when the virtual model settings are saved.

FIGURE 3-13. VIRTUAL MODEL DIALOG BOX

3.4 REMOTE PROGRAMMING USING ANALOG SIGNALS

The voltage and current inputs (Vref and Cref, respectively) of the Analog I/O Port (see J2, Fig­ure 2-2 and Table 2-2) are normally inactive. These are activated by connecting pin 12 of J2 to
one of the four GND pins: J2 pin 9, 11, 13 or 15 before turning the power supply on. Once the
power supply is turned on the status display reads aRem. While the power supply is in analog
remote mode, digital queries related to status and readback will be accepted and executed. The
following paragraphs provide detailed information for using analog programming signals.

NOTE: Optimum resolution is achieved with 10V programming input which is equivalent to full

scale. Decreasing the analog voltage equivalent to full scale (see PAR. 4.3.3) will
cause a corresponding decrease in programming resolution.

With the exception of Vref and Cref, all the other Analog I/O Port functions are active regardless
of the status of the analog control signal applied to J2 pin 12. These include internal relay:
RELAY_NO (pin 2), RELAY_COM (pin 4), RELAY_NC (pin 10); voltage and current readbacks:
VOLT_RBACK (pin 6) and CURR_RBACK (pin 7); external trigger: EXT_TRG (pin 14) and
remote inhibit: REM_INH (pin 8).

3.4.1 ENABLING/DISABLING THE OUTPUT USING ANALOG CONTROL

If the output has previously been enabled, the Remote Inhibit (rINH) signal applied to analog
I/O port pin 8 (see PAR. 2.7.9) allows the output to be enabled/disabled remotely. If the output is
already off, this signal has no effect; however if it is active, and an attempt is made to turn the
output on, the output will stay off and rINH will appear in the status display.

This signal is a TTL signal that can be programmed to be active (turn the output off) for either a
TTL high (logic 1) or TTL low (logic 0) (see PAR. 3.2.13.5.1).

If rINH is set to be active for low, an open condition at pin 8 causes the output state to default to
ON and the output will go to the levels programmed on Vref and Cref without warning.

If rINH is set to be active for high, an open condition at pin 8 causes the output to remain off. If
quick-boot (see PAR. 3.2.13.4) is off and rINH is set to high, upon power-up the status display
will flash rINH at the end of the start-up sequence to remind the user of this condition (see PAR.

3.2.1).

3-30 KLP031308

3.4.2 PROGRAMMING WITH EXTERNAL RESISTANCE

Figure 3-14 is a simplified diagrams of the KLP showing the switch configuration and external
connections required for analog programming using an external resistance.

1. Overvoltage and Overcurrent settings must be established via either local programming or
digital remote programming prior to initiating Analog Remote programming. (see PAR.

3.4.4.)

2. Turn off power and configure the Analog I/O DIP switch (Figure 2-2) as follows:

SW1: ON (Program output voltage via resistance)
SW2: ON (Program output current via resistance)
SW3: either OFF or ON (disabled when in remote analog programming mode; see

Table 2-2)
SW4: Reserved - Do not use.
SW5: Either OFF (Local controls enabled) or ON (Local controls locked)

3. Configure Analog I/O Port J2 (Figure 2-2) by referring to Table 2-7 and Figure 3-14 (ground­ing J1 pin 12 enables analog programming).

FIGURE 3-14. ANALOG PROGRAMMING OF OUTPUT VOLTAGE OR

CURRENT USING RESISTANCE

With the power supply configured as shown in Figure 3-14 and assuming the load causes the
power supply to operate in voltage mode, varying external resistor R2 from 0 to 10K causes the
output voltage of the power supply to vary linearly from 0 to full scale, while R1 can be used to
adjust the current limit. When the power supply operates in current mode, R2 will adjust the volt­age limit and R1 will adjust output current.

Factory default full scale (F.S.) resistance programming is 10K ohms based on F.S. program­ming voltage of 10V. To set full scale resistance to a lower value, see PAR. 4.3.3 to change the
F.S. programming voltage to a lower value, then adjust based on 1000 ohms/Volt.

KLP031308 3-31/(3-32 Blank)

3.4.3 PROGRAMMING WITH EXTERNAL VOLTAGE

Figure 3-15 is a simplified diagrams of the KLP showing the switch configuration and external
connections required for analog programming using an external voltage.

1. Virtual Model (PAR. 3.2.6) and Overvoltage and Overcurrent settings (PAR. 3.4.4) must be
established via either local programming or digital remote programming prior to initiating
Analog Remote programming.

2. Turn off power and configure the Analog I/O DIP switch (Figure 2-2) as follows:

SW1: OFF (Program output voltage via voltage)
SW2: OFF (Program output current via voltage)
SW3: either OFF or ON (disabled when in remote analog programming mode; see

Table 2-2)
SW4: Reserved - Do not use
SW5: Either OFF (Local controls enabled) or ON (Local controls locked)

3. Configure Analog I/O Port J2 (Figure 2-2) by referring to Table 2-7 and Figure 3-15 (ground­ing J1 pin 12 enables analog programming).

4. Refer to PAR. 3.4.4 to change overvoltage or overcurrent setting in analog programming
mode.

With the power supply configured as shown in Figure 3-15 and assuming the load causes the
power supply to operate in voltage mode, varying source voltage V2 from 0 to maximum causes
the output voltage of the power supply to vary linearly from 0 to full scale, while V1 can be used
to adjust the current limit. When the power supply operates in current mode, V2 will adjust the
voltage limit and V1 will adjust output current.

Factory default full scale (F.S.) voltage programming is 10V. To set full scale voltage program­ming to a lower value, see PAR. 4.3.3

FIGURE 3-15. ANALOG PROGRAMMING OF OUTPUT VOLTAGE OR CURRENT USING VOLTAGE

3.4.4 CHANGING OVERVOLTAGE OR OVERCURRENT PROTECTION VALUES IN ANALOG
PROGRAMMING MODE

Overvoltage and overcurrent values can not be changed using analog remote programming;
this can only be done by issuing a command via the GPIB or RS232 port, or via local mode from
the front panel (enter local mode by pressing the VOLTAGE and CURRENT adjustment con­trols at the same time, then see PAR. 3.2.8).

If the panel is locked and RS 232 or GPIB access is not possible, turn the power supply off, set
ANALOG I/O DIP switch position 5 to OFF, and then power up again to unlock the panel
(PAR.3.2.2.1). After the settings have been changed, turn the power supply off, set ANALOG
I/O DIP switch position 5 to ON to relock the panel, then turn on the power supply to restore
Analog Remote Programming (status display reads aRem).

KLP 031308 4-1

SECTION 4 - CALIBRATION

4.1 GENERAL

This section contains the calibration instructions for the Power Supply. It is recommended that
the user be familiar with Local Mode operation (PAR.3.2) before calibrating the unit.

A full calibration consist of a voltage calibration and a current calibration. Both voltage and cur­rent calibrations consist of a zero and a full scale calibration.

External calibration calibrates the precise user-defined reference voltages used that will be
equivalent to full scale output when external analog programming is used.

NOTE: Calibrating the unit resets all internal memory locations used for saving active settings

(*SAV, *RCL), programmed sequences using the LIST commands, and trigger levels
established by CURR:TRIG and VOLT:TRIG. These parameters are returned to the
default minimum (0V, minimum A).

In order to enter the calibration mode the correct unit password must be entered. If the pass­word has been forgotten, call the factory and a special password (which has been assigned to
your power supply) will be provided. During the calibration, new calibration data is computed
which is then stored in the nonvolatile memory either when EXIT is executed (local mode, PAR.

4.3.4) or SAVE Calibration is executed (remote mode, PAR 4.4.4).

Calibration of the KLP is performed in one of two ways: locally using the front panel controls
(PAR. 4.3), or remotely using the graphical interface supplied with the VXI plug&play instrument
driver available at www.kepcopower.com/drivers/. The VISA compliant VXI plug&play driver
works with many GPIB cards from suppliers such as National Instruments and Hewlett-Packard.
These two ways cannot be combined.

4.2 EQUIPMENT REQUIRED

The following equipment is required to calibrate the KLP Power Supply.

• Digital Voltmeter (DVM) with 6 digits resolution and at least 0.002% accuracy for d-c
measurements.

NOTE: Because the voltage measured will be used as a reference for calibration, the DVM

used must be accurately calibrated prior to calibrating the power supply.

• Precision Shunt Resistor (with a tolerance of 0.01%, power rating of at least 10 times
larger than the maximum stress, and a temperature coefficient equal to or better than 20
ppm per degree C).

• A stable, clean d-c power source capable of supplying 10.0000V (or other desired full
scale analog voltage) at 10mA minimum (a linear power supply or reference voltage I.C.
is recommended).

NOTE: Proper cooling of the external precision shunt resistor ensures the accuracy of the cal-

ibration.

4-2 KLP 031308

4.3 CALIBRATION USING FRONT PANEL CONTROLS IN LOCAL MODE

For voltage calibration all loads must be disconnected and the sense terminals connected to the
corresponding output terminals. The digital voltmeter will be connected to the output of the
power supply. For current calibration after disconnecting all loads an appropriate shunt resistor
will be connected across the output terminals and the digital voltmeter will be connected across
the sense terminals of the shunt resistor.

1. Turn off power supply and disconnect load from output terminals at the rear of the unit.

2. Verify that power supply is configured for local error sensing (PAR. 2.7.5.1).

3. For voltage calibration connect DVM to (M+, S+) and (M-, S-) of terminal block at the rear of
power supply.

4. For current calibration connect an appropriate shunt resistor (see PAR 4.2) across the output
terminals and connect DVM to shunt resistor terminals.

5. Turn on power supply, exit SET mode by tapping either VOLTAGE or CURRENT control and
using a thin tool (e.g., a paper clip), press the FUNCTION switch once until the status display
reads VIRT, then rotate either the VOLTAGE or CURRENT control in either direction until
status display reads UTIL.

6. Tap the DC OUTPUT switch once, then rotate either the VOLTAGE or CURRENT control in
either direction until status display reads CAL.

7. Tap DC OUTPUT switch to enter calibration mode. The status display shows PASS. Enter the
password (see PAR. 3.2.5) and tap DC OUTPUT switch to accept the number.

8. When the password is accepted, status display reads V ?. Tapping either VOLTAGE or
CURRENT control continuously cycles through all the calibration choices. The status display
reads: V ? for voltage calibration C ? for current calibration, EXT? for remote analog cali­bration, and EXIT to save the calibrated results. Tap the FUNCTION switch to exit calibration
WITHOUT saving any calibration data (see PAR. 4.3.4). Tap the DC OUTPUT switch to
select the displayed choice.

NOTE: Calibrations may be done in any order.

9. Proceed to PAR. 4.3.1 for voltage calibration, PAR 4.3.2 for current calibration, PAR. 4.3.3
for external calibration or PAR. 4.3.4 to exit calibration

4.3.1 VOLTAGE CALIBRATION (LOCAL)

During voltage calibration, the voltage, voltage readback and remote analog voltage readback
are calibrated.

1. Minimum voltage is first; the status display reads V_0. Monitor DVM and rotate the VOLT-
AGE control to increase or decrease the output voltage until the DVM reads as close as pos­sible to minimum rated voltage.

2. Tap the DC OUTPUT switch to accept the value. The status display then reads VMAX. Moni­tor DVM and rotate the VOLTAGE control to increase or decrease the output voltage until the
DVM reads as close as possible to maximum rated voltage.

KLP 031308 4-3

3. Tap the DC OUTPUT switch to accept the value. The status display then reads OUTV. Con-
nect the DVM to ANALOG I/O PORT J2, pin 13 (M–) and pin 6 (M+). Rotate the VOLTAGE
control to increase or decrease the output voltage until the DVM reads as close as possible
to 10V.

4. Tap the DC OUTPUT switch to accept the value. The status display reads C ?. Tap the DC
OUTPUT switch to proceed to Current Calibration (see PAR. 4.3.2), or tap either VOLTAGE
or CURRENT control to advance to next choice

4.3.2 CURRENT CALIBRATION (LOCAL)

During current calibration, the current, current readback and analog current readback are cali­brated.

1. The status display reads LOAD. When the shunt and DVM are connected per PAR. 4.3, step
4, tap the DC OUTPUT switch. The status display reads CMAX.

2. Rotate the CURRENT control to increase or decrease the DVM reading until the DVM read­ing corresponds as close as possible to maximum rated current (Calculate current as fol­lows:
I (Amperes) = DVM reading (Volts) / Shunt Resistance (Ohms).

3. Tap the DC OUTPUT switch to accept the value. The status display reads C_0. Rotate the
CURRENT control to increase or decrease the DVM reading until the DVM reading corre­sponds to minimum positive or zero current (Calculate current as follows:
I (Amperes) = DVM reading (Volts) / Shunt Resistance (Ohms).

4. Tap the DC OUTPUT switch to accept the value. The status display reads CMAX. Rotate the
CURRENT control to increase or decrease the DVM reading until the DVM reading corre­sponds as close as possible to maximum rated current (Calculate current as follows:
I (Amperes) = DVM reading (Volts) / Shunt Resistance (Ohms).

5. Tap the DC OUTPUT switch to accept the value. The status display reads OUTC. Connect
the DVM to ANALOG I/O PORT J2, pin 13 (M–) and pin 7 (M+). Rotate the CURRENT con­trol to increase or decrease the output voltage until the DVM reads as close as possible to
10V.

6. Tap the DC OUTPUT switch to accept the value. The status display reads EXT?. Tap the DC
OUTPUT switch to proceed to External Calibration (see PAR. 4.3.2), or tap either VOLTAGE
or CURRENT control to advance to next choice

4.3.3 EXTERNAL CALIBRATION (LOCAL)

During external calibration the external analog reference voltages used to establish full scale
output current and voltage are calibrated and defined. The factory default calibration is 10V pro­grams full scale output, however the following procedure allows any d-c value up to 10V to pro­gram full scale, while a voltage proportionately less programs a corresponding decrease in the
output.

NOTE: The full scale programming voltage has a 1:1 correspondence with the external read-

back; i.e., 10V full scale programming voltage results in a 10V full scale readback. If
the full scale programming voltage is changed to a value other than 10V, the full scale
readback voltage is changed accordingly.

4-4 KLP 031308

1. The status display reads INPV. Refer to PAR 3.4 to connect the reference voltage used to
define full scale output voltage. as the source as described in PAR 3.4.

2. When the reference voltage is at the desired value, tap the DC OUTPUT switch to accept the
value. When the calibration is saved, this analog voltage will be equivalent to full scale output
voltage. The full scale output voltage is determined by the virtual settings in effect.

3. The status display reads INPC. Connect the reference voltage used to define full scale out­put current as described in PAR 3.4.

4. When the reference voltage is at the desired value, tap the DC OUTPUT switch to accept the
value. When the calibration is saved, this voltage value will be equivalent to full scale output
current. The full scale output current is determined by the virtual settings in effect.

5. The status display reads EXIT. Proceed to PAR. 4.3.4 to exit calibration.

4.3.4 CALIBRATION EXIT (LOCAL)

NOTE: using a thin tool (e.g., a paper clip), tap the FUNCTION switch to exit calibration WITH-

OUT saving any calibration data. If no calibrations were completed, then the unit
advances to the next function as if the FUNCTION switch was pressed.

1. When the status display reads EXIT, tap the DC OUTPUT switch to save the calibration.

2. The status display reads DATE. The DC VOLTS display represents MMDD (month, day) and
the DC AMPS display represents YYYY (year). The factory calibration date is displayed with
the first digit blinking as a starting point to enter the current date. Rotate either the VOLTAGE
or CURRENT controls to change the digit, then tap either control to move to the next digit.

NOTE: For purposes of traceability the user is strongly urged to enter the calibration date upon

completion of calibration. If a date is not entered, no date is saved.

3. Tap DC OUTPUT switch to accept date. If any calibration (voltage, current or external) was
completed, the unit will save the new calibration. The status display reads "DONE" while cal­ibration is being saved.

4. Once saved the unit enters Virtual Model mode. Follow the procedure in PAR 3.2.6 to set the
virtual model.

NOTE: The virtual model is always reset following calibration. If voltage calibration is com-

pleted (regardless of whether or not current calibration is completed), the virtual model
voltage is set for maximum rated voltage, and current is set to the value corresponding
to 1200 Watts. If ONLY current calibration is completed, the virtual model current will
be set for maximum rated current and voltage is set to the value corresponding to 1200
Watts.

4.4 CALIBRATION USING VXI plug&play DRIVER

Calibration of the KLP can be performed using SCPI commands implemented through the VXI
plug&play Instrument driver. The driver provides a graphical interface with informational dis­plays and prompts which lead you through the calibration of the KLP. This VISA compliant driver
works with many GPIB cards from suppliers such as National Instruments and Hewlett-Packard.

The following calibration procedure uses the “soft” front panel which is part of the VXI plug&play
driver for the KLP which can be downloaded from the Kepco website at: www.kepcopower.com/
drivers/ or from the supplied CD.

KLP 031308 4-5

Unzip the files and doubleclick on setup.exe to install the driver. The Kepco\klp folder will be
added to the Start - Programs folder. Doubleclick KLPCTRL.exe to run the program, and refer to
the KLP Developer’s Guide in the Kepco\klp folder for details about using the soft front panel.

For voltage calibration all loads must be disconnected and the sense terminals connected to the
corresponding output terminals. The digital voltmeter will be connected to the output of the
power supply. For current calibration after disconnecting all loads an appropriate shunt resistor
will be connected across the output terminals and the digital voltmeter will be connected across
the sense terminals of the shunt resistor.

1. Turn off power supply and disconnect load from output bus bar at the rear of the unit.

2. Verify that power supply is configured for local error sensing (See PAR. 2.7.5.1).

3. For voltage calibration connect DVM to (M+, S+) and (M–, S–) of terminal block at the rear of
power supply.

4. For current calibration connect an appropriate shunt resistor (see PAR 4.2) across the output
terminals and connect DVM to shunt resistor terminals.

5. Turn on power supply, and after the status display shows SET, start the KLP VXI plug&play
demo program.

6. Click the Calibrate Access button on the VXI plug&play demo main panel: the button label
changes to Calibrate Close and the Calibration Window (Figure 4-1) opens with all buttons
disabled (grayed out) and PASSWORD appears in the text box near the top of the window.

FIGURE 4-1. CALIBRATION WINDOW

4-6 KLP 031308

7. Use the computer keyboard to enter the password in the text box displaying the word PASS­WORD, then press the ENTER key.

8. If password is correct, the status display on the VXI main panel reads CAL and the buttons
on Calibration Screen (Figure 4-1) are enabled (highlighted). If the password is incorrect,
the password text box displays "WRONG #". Repeat step 7 to enter the correct password, or
click the Calibrate Close button on the VXI main panel to exit calibration.

NOTE: Calibrations may be done in any order.

9. Proceed to PAR. 4.4.1 for voltage calibration, PAR 4.4.2 for current calibration., PAR. 4.4.3
for external calibration or PAR. 4.4.4 to exit calibration

4.4.1 VOLTAGE CALIBRATION (VXI plug&play DRIVER DEMO)

During voltage calibration, the voltage, voltage readback and remote analog voltage readback
are calibrated.

1. Click the VOLTAGE button on the Calibration window to start voltage calibration: the Voltage
Calibration Window (Figure 4-2) appears. Minimum voltage is first; the status display (on the
VXI main panel) reads V_0. Monitor DVM and click the “+” button to increase and the “–“ to
decrease the output voltage until the DVM reads as close as possible to minimum rated
POSITIVE voltage.

FIGURE 4-2. VOLTAGE CALIBRATION WINDOW

2. Click the PRESS TO ACCEPT button to accept the value. The status display then reads
VMAX. Monitor DVM and click the “+” button to increase and the “–“ to decrease the output

voltage until the DVM reads as close as possible to maximum rated voltage.

KLP 031308 4-7

3. Click the PRESS TO ACCEPT button to accept the value. The status display then reads
OUTV. Connect to DVM (+) to Analog I/O Port J2, pin 6 and DVM (–) to pin 13. Click the “+”
button to increase and the “–-“ button to decrease the output voltage until the DVM reads as
close as possible to 10V.

4. Click the PRESS TO ACCEPT button to accept the value. The status display will not change.
At the calibration window, click the CURRENT Button to proceed to current calibration (see
PAR. 4.4.2).

4.4.2 CURRENT CALIBRATION (VXI plug&play DEMO)

During current calibration, the current, current readback and analog current readback are cali­brated.

1. Click the CURRENT button on the Calibration Window to start current calibration; the Cur­rent Calibration Window (Figure 4-3) appears and the status display on the VXI main panel
reads CMAX.

FIGURE 4-3. CURRENT CALIBRATION WINDOW

2. Monitor DVM and click the “+” button to increase and the “–“ to decrease the output current
until the DVM reads as close as possible to maximum rated current (Calculate current as fol­lows:

I (Amperes) = DVM reading (Volts) / Shunt Resistance (Ohms).

3. Click the PRESS TO ACCEPT button to accept the value. The status display reads C_0.
Click the “+” button to increase and the “–“ to decrease the output current until the DVM
reads as close as possible to minimum positive or zero current (Calculate current as follows:

(Amperes) = DVM reading (Volts) / Shunt Resistance (Ohms).

4-8 KLP 031308

4. Click the PRESS TO ACCEPT button to accept the value. The status display reads CMAX.
Click the “+” button to increase and the “–“ to decrease the output current until the DVM
reads as close as possible to maximum rated current (Calculate current as follows:

I (Amperes) = DVM reading (Volts) / Shunt Resistance (Ohms).

5. Click the PRESS TO ACCEPT button to accept the value. The status display reads OUTC.
Connect to DVM (+) to Analog I/O Port J2, pin 7 and DVM (–) to pin 13. Click the “+” button
to increase and the “–“ to decrease the output current until the DVM reads as close as pos­sible to 10V.

6. Click the PRESS TO ACCEPT button to accept the value. The status display will not change.
Click the ANALOG REF button on the calibration window to proceed to external calibration
(see PAR. 4.4.3).

4.4.3 ANALOG REFERENCE CALIBRATION (VXI plug&play DEMO)

During analog reference calibration the external analog reference voltages used to establish full
scale output current and voltage are defined. The factory default calibration of 10V programs full
scale output, however the following procedure allows any d-c value up to 10V to program full
scale, while a voltage proportionately less programs a corresponding decrease in the output.

NOTE: The full scale programming voltage has a 1:1 correspondence with the external read-

back; i.e., 10V full scale programming voltage results in a 10V full scale readback. If
the full scale programming voltage is changed to a value other than 10V, the full scale
readback voltage is changed accordingly.

1. Click the ANALOG REF button on the Calibration Window; the Analog Reference Calibration
Window (Figure 4-4) appears and the status display on the VXI main panel reads
INPV.When the reference voltage is at the desired value, click the PRESS TO ACCEPT but-
ton to accept the value. When the calibration is saved, this analog voltage will be equivalent
to full scale output voltage. NOTE: The full scale output voltage is determined by the vir-

tual settings in effect.

FIGURE 4-4. ANALOG REFERENCE CALIBRATION WINDOW

KLP 031308 4-9

2. The status display reads INPC. Connect the reference voltage used to define full scale out­put current as described in PAR 3.4.

3. When the reference voltage is at the desired value, click the PRESS TO ACCEPT button to
accept the value. When the calibration is saved, this voltage value will be equivalent to full
scale output current. NOTE: The full scale output current is determined by the virtual

settings in effect.

4. The status display will not change. Proceed to PAR. 4.4.4 to exit calibration.

4.4.4 CALIBRATION EXIT (VXI plug&play DEMO)

NOTE: Clicking the Calibrate Close button on the VXI main panel will exit calibration WITH-

OUT saving any calibration data.

1. Click the SAVE CALIBRATION button on the calibration window to save this calibration.

2. The Calibration window automatically closes and the Virtual Model window automatically
opens.

3. The virtual model settings can be changed after the password has been properly entered.

4. NOTE: The virtual model is always reset following calibration. If voltage calibration is com­pleted (regardless of whether or not current calibration is completed), the virtual model volt­age is set for maximum rated voltage, and current is set to the value corresponding to 1200
Watts. If a current calibration is completed, but no Voltage calibration, the virtual model cur­rent will be set for maximum rated current and voltage is set to the value corresponding to
1200 Watts.

4.5 CHANGING THE CALIBRATION PASSWORD

The 4-digit Unit password is required for to enter calibration mode. The factory default Unit
password is listed in Table 4-1. To change the password from the front panel proceed as fol­lows:

1. If the status display shows SET, tap either the CURRENT or VOLTAGE controls to take the
unit out of setpoint mode (status display goes from SET to blank)

2. Hold the PROTECT switch in and use a thin tool (e.g., a paper clip), to press the FUNCTION
switch. Status display reads PASS.

NOTE: To exit this procedure without changing the password, rotate the VOLTAGE control.

3. Tap the DC OUTPUT switch. Status display reads OLD?.

4. Rotate the CURRENT control until DC AMPERES display shows old password. Tap the DC
OUTPUT switch to enter. Status display shows NEW?.

5. Rotate the CURRENT control until DC AMPERES display shows new password. Tap the DC
OUTPUT switch to enter. Status display shows RPT?.

6. Rotate the CURRENT control until DC AMPERES display reads new password. Tap the DC
OUTPUT switch to enter. Status display reads DONE and the unit returns to setpoint mode.

4-10 KLP 031308

4.6 RESTORING PRIOR CALIBRATION VALUES

Calibration values for KLP are stored in three separate locations designated: Factory, Previous
and Working. Each time the unit is calibrated, the Working values are moved to Previous, and
the new calibration values are stored in Working. It is possible to replace the Working calibration
values with either the Previous or the Factory calibration values; contact Kepco Sales Engineer­ing for details.

TABLE 4-1.FACTORY DEFAULT UNIT PASSWORDS

MODEL

(-1200 OR -1.2K)

UNIT

PASSWORD

KLP 10-150 1015

KLP 20-120 2012

KLP 36-60 3660

KLP 75-33 7533

KLP 150-16 1516

KLP 300-8 3008

KLP 600-4 6004

©2007, KEPCO, INC 228-1512 3/13/08
Data subject to change without notice

KEPCO, INC.

" 131-38 SANFORD AVENUE " FLUSHING, NY. 11352 U.S.A. " TEL [phone] "

FAX [phone]

http://www.kepcopower.com " email: [e-mail]

KLP INSTALLATION/OPERATION SUMMARY

This summary can be printed as a handy overview to common tasks covered in the KLP User Manual, and includes hyperlinked refer­ences to appropriate paragraphs, Tables and Figures and Kepco website pages for more details.

INITIAL SETUP INSTRUCTIONS

1. Location: Do not obstruct front and rear panel vents; additional clearance at side, top and bottom vents is recommended.

2. Connect power supply output to load:

• Voltage drop must be less than 0.25V per conductor (see Nomograph1 at http://www.kepcopower.com/nomomax.htm)

• Local error sense operation is factory default; for remote error sense operation see PAR. 2.7.5.1.

• For parallel or series operation of two or more power supplies see PAR. 2.7.7 and 2.7.6, respectively.

3. Connect remote programming cables (if applicable): Only one remote programming input may be active at a time.

• Remote analog programming:

Connect programming cable between programming source and J2; see Table 2-7 and PAR.

2.7.9.

• Digital programming using GPIB: Connect programming cable between host computer and J4; see Table 2-3 and PAR. 2.8.1.

• Digital programming using RS 232 [-1200 Models only]: Connect programming cable between host computer and J3; see
PAR. 2.8.2 and Table 2-4.

• Digital programming using LAN [-1.2K Models only]: Connect LAN cable between host computer and J3; see PAR. 2.8.3
and Table 2-5.

4. Connect power supply to power source using one of the following: See PAR. 2.7.2 for additional information.

• Use standard NEMA line cord set from Kepco (see Table 1-4) or customized line cord using user-wireable mating connector
(supplied) in conjunction with user-selected line cord or discrete wiring as applicable.

• See Table 2-8 for source power branch current rating and overload protection recommendations.

5. Apply source power: Set Power ON/OFF circuit breaker/switch on front panel to ON. Apply firm, continuous pressure to rocker
actuator until fully engaged (right side of rocker actuator locked parallel to front panel). If actuator does not lock when released,
allow actuator to return to starting position, then wait a few seconds before repeating turn-on sequence. DO NOT attempt to
"tease" the switch contacts closed by repetitive press-and-release action. The circuit breaker is "trip-free" design; if overload
exists, contacts cannot be held closed by actuator.

LOCAL OPERATING MODE INSTRUCTIONS

How do I enable/disable the output? Press DC OUTPUT to toggle output on and off. The output cannot be enabled while SET

appears in the status display; tap either knob to exit setpoint mode. The output can be disabled at any time. VOLTS and AMPS dis­plays show actual output parameters as determined by the load (see PAR. 3.2.3).

How do I establish the operating mode? Operating mode is determined automatically by the programmed voltage (Vp) and current
(Ip) settings and the load. If the load impedance is greater than Vp/Ip, the unit operates in CV mode (voltage stabilized to voltage set­point). If the load impedance is less than Vp/Ip, the unit operates in CC mode (current stabilized to current setpoint) (see PAR. 3.2.7).
Crossover between operating modes is seamless and automatic. CV and CC indicators show present mode.

How do I adjust output voltage or current (real-time)? Enable the output. If in CV mode (indicator lit), rotate Voltage knob until
VOLTS display shows desired output voltage. If in CC mode (indicator lit), rotate Current knob until AMPS display shows desired out­put current. Pressing and holding control knob in while turning provides fine adjustment. Rotating knob controlling limit parameter
(Voltage in CC mode, Current in CV mode) changes limit setting, however change is invisible since actual outputs are displayed on
VOLTS and AMPS displays (see PAR. 3.2.7.1).

How can I see what the voltage and current setpoints are? Tap (press and release) either Voltage or Current knob once to enter
setpoint mode (status reads SET). VOLTS and AMPS displays show the setpoints. Tap either knob once to exit setpoint mode (SET
disappears) (see PAR. 3.2.7.2).

How do I change voltage and current setpoints (enter and exit setpoint mode)? Setpoint mode can be entered with output
enabled or disabled, but output CAN NOT be enabled while setpoint mode is active. Tap (press and release) either Voltage or Current

knob once to enter setpoint mode (status reads SET). Rotate Voltage and Current knobs until desired values appear in VOLTS and
AMPS displays; pressing and holding control knob in while turning provides fine adjustment. Tap either knob once to exit setpoint
mode (SET disappears) (see PAR. 3.2.7.2).

What happens when setpoint mode is exited? If the output is enabled, exiting setpoint causes output to jump to new setpoints. If
the output was disabled prior to or while in setpoint, exiting setpoint stores the new settings in memory; when output is enabled, output
jumps to programmed setpoints. When setpoint is exited, VOLTS and AMPS revert to actual output values as determined by the load.

How do I enter a Password? Password is required to set Virtual Model or calibrate the unit. Status shows PASS (password) and
Current Display shows 0000. Rotate Current knob to select a number from 0-9. Tap Current knob to advance to next digit. Repeat
until all four digits have been selected. Tap DC OUTPUT to accept the number. See Table 4-1 for default passwords.

How do I enter/exit Function mode? To enter a function, press FUNCTION using a thin tool once so status reads VIRT (virtual
model, see below); rotate Voltage or Current knobs for ADDR (set GPIB address, PAR. 3.2.9), BAUD (1200 models only, set RS 232
baud rate, PAR. 3.2.10), LAN (-1.2K models only, configure LAN parameters. see PAR. 3.2.12), M/S (-1200 models only, Master/
Slave, PAR. 3.2.11), UTIL (utility, PAR. 3.2.13). or EXIT. To select a function, tap DC OUTPUT.

How do I view/change the virtual model settings? See PAR. 3.2.6 for description of virtual model. If status shows SET, exit set-
point mode (tap either knob once). Use thin tool to press FUNCTION once; status reads VIRT. VOLTS and AMPS displays show the

maximum voltage and current of the present virtual model. If no change, exit function mode (see above). To change, press DC OUT­PUT once. Status shows PASS (password). Enter password (see above) and tap DC OUTPUT to accept. When password is
accepted, status reads VIRT, VOLTS and AMPS displays blink. To change setting rotate Voltage and Current knobs until VOLTS and
AMPS displays show desired virtual model settings. (Press and hold knob in while turning for fine adjustment.) Press DC OUTPUT to
accept virtual model settings. Unit displays DONE, then resets and repeats power on sequence.

How do I view/change overvoltage and overcurrent protection limits? See PAR.3.2.6 for description of protection limits. If status
reads SET, tap either knob to exit setpoint mode. To view protection limits, use a thin tool to press and hold PROTECT until status

reads PROT, VOLTS and AMPS displays show the protection limits; to change limits, while continuing to hold PROTECT in, adjust
OVP and OCP limits using the Voltage and Current knobs. When PROTECT released, values showing in VOLTS and AMPS displays
are the new protection limits.

REMOTE ANALOG OPERATING MODE INSTRUCTIONS

How do I enable analog operating mode? Connect ANALOG_CTRL (pin 12) to GROUND (pin 9, 11, 13, or 15) of analog port prior

to power-up to enable remote analog programming for that session. Remote analog control is indicated by "aREM" in status display.
The status of ANALOG_CTRL is sensed at power-up only. Enabling analog operating mode disables the local operating controls on
the front panel. (see PAR. 3.4).

How do I enable or disable the output? Connect REM_INH (pin 8) to GROUND (pin 9, 11, 13, or 15) of analog port to disable
power supply output, open the connection to enable the output (see PAR. 3.4.1). The DC OUTPUT control on the front panel remains
active in remote analog programming mode.

How do I adjust voltage and current setpoints using an external voltage source? Set analog I/O DIP switch positions 1 and 2 up
(factory default position) to use external voltage control of voltage and current, respectively. Full-scale programming voltage is factory
set at 10V; to alter full-scale value see PAR. 3.2.13.6. Apply a 0-10V signal from Vref (pin 1) and Cref (pin 3) to GROUND (pin 9, 11,
13, or 15) of analog port to adjust the setpoint values for output voltage and current proportionally between minimum and maximum
virtual model limits. Programming input pins are only active when analog port is enabled. (See PAR. 3.4.3 for details.)

How do I adjust voltage and current setpoints using an external resistance? Set analog I/O DIP switch positions 1 and 2 down
to use external resistance for remote analog programming of voltage and current, respectively. Full-scale programming resistance is
factory set at 10KOhms; to alter full-scale value see PAR. 3.2.13.6 and use 1000 ohms per volt scale factor. Apply a 0-10KOhm resis­tance from Vref (pin 1) and Cref (pin 3) to GROUND (pin 9, 11, 13, or 15) of analog port to adjust the setpoint values for output volt­age and current proportionally between minimum and maximum virtual model limits. Programming inputs are only active when analog
port is enabled. (See PAR. 3.4.2 for details.)

How do I Read back operating voltage and current? Analog signals proportional to actual output voltage and current levels are
available at VOLT_RBACK (pin 6) and CURR_RBACK (pin 7) of analog I/O port. Full-scale signal level is the same as that for full
scale programming. Readback signals are always available at analog port, even if analog programming is not enabled.

How do I exit remote analog programming mode? Simultaneously depressing and releasing both Voltage and Current knobs
forces the unit to exit remote analog programming mode and return to local operating mode; this can also be done by sending any
command or query via the remote digital inputs. To restore remote analog control cycle source power OFF for five seconds then
restart.

REMOTE DIGITAL OPERATING MODE INSTRUCTIONS

How do I enable digital operating mode? Sending any digital command or query via either the GPIB, LAN or RS 232 port immedi-

ately sets the unit in remote digital operating mode and disables the local operating controls on the front panel. For details on com­mand formatting and communication protocols see PAR. 3.3.

How do I exit remote digital programming mode? Simultaneously depressing and releasing both Voltage and Current knobs will
force the unit to exit remote digital programming mode and return to local operating mode. Remote digital control is reactivated upon
transmission of any digital command or query by the control (host) computer.

How do I view/change the GPIB address? The factory default GPIB address is 6. Using a thin tool, press FUNCTION once; status
reads VIRT. Rotate Voltage or Current knob until status reads ADDR; the active GPIB address shows in AMPS display. To exit,
rotate Voltage or Current knob till status reads EXIT then tap DC OUTPUT. To change, tap DC OUTPUT: AMPS display blinks.
Rotate Current knob to change address and tap DC OUTPUT to accept; display flashes DONE then ADDR. See above to exit.

How do I view/change RS 232 baud rate? [-1200 Models Only] The factory default RS 232 baud rate is 38400. Using a thin tool,
press FUNCTION once; status reads VIRT. Rotate Voltage or Current knob until status reads BAUD; AMPS display shows active
baud rate x 1000 (e.g., 38400 is displayed as 38.4). To exit, rotate Voltage or Current knob till status reads EXIT then tap DC OUT­PUT. To change, tap DC OUTPUT: AMPS display blinks. Rotate Current knob to change baud rate and tap DC OUTPUT to accept;
display flashes DONE then BAUD. See above to exit. See PAR. 3.3.1.2 for additional RS 232 parameters.

How do I set up the LAN interface? [-1.2K Models Only] See PAR. 3.2.12 and refer to KLP Developer’s Guide.

How do I operate the KLP using web pages via the LAN interface? [-1.2K Models Only] See PAR. 3.3.6 and refer to KLP Devel-

oper’s Guide. Use the PSfind program (on CD supplied) to locate KLP(s) functioning on the LAN. Highlight the unit and click Launch
Web Page. Click OPERATE INSTRUMENT. Simulated front panel shows status of voltage, current, output on/off, and operating
mode (CV or CC). Operating functions supported from Operate Instrument page: Set output on/off and output voltage/current (PAR.

3.3.6.5.1), overvoltage/overcurrent protection (PAR. 3.3.6.5.2), save/recall (PAR. 3.3.6.5.3), reset (PAR. 3.3.6.5.4), list (PAR.

3.3.6.5.5) and virtual model (PAR. 3.3.6.5.6). Click CONFIGURE LAN to change LAN addresses or set up LAN passwords (PAR.

3.3.6.3). Click ID INSTRUMENT to flash physical LAN indicator on KLP.