Ametek XG 6-220, XG 12.5-120, XG 8-187.5, XG 8-100, XG 12-140 Operating Manual

Half Rack

Full Rack

6 V to 600 V Models:

6-110

6-220

6-220

8-100

8-187.5

8-200

12-70

12.5-120

12-140

20-42

20-76

20-84

33-25

30-50

33-50

40-21

40-38

40-42

60-14

60-25

60-28

80-10.5

80-19

80-21

100-8.5

100-15

100-17

150-5.6

150-10

150-11.2

300-2.8

300-5

300-5.6

600-1.4

600-2.6

600-2.8

PROGRAMMABLE POWER

XG Family Programmable DC

Power Supply

Operating Manual

(firmware v 2.0 and higher)

670 Watts – 1700 Watts

M370430-01 Rev F www.programmablepower.com

About AMETEK

AMETEK Programmable Power, Inc., a Division of AMETEK, Inc., is a global leader in the
design and manufacture of precision, programmable power supplies for R&D, test and
measurement, process control, power bus simulation and power conditioning applications
across diverse industrial segments. From bench top supplies to rack-mounted industrial power
subsystems, AMETEK Programmable Power is the proud manufacturer of Elgar, Sorensen,
California Instruments and Power Ten brand power supplies.

AMETEK, Inc. is a leading global manufacturer of electronic instruments and
electromechanical devices with annualized sales of $2.5 billion. The Company has over 11,000
colleagues working at more than 80 manufacturing facilities and more than 80 sales and
service centers in the United States and around the world.

Trademarks

AMETEK is a registered trademark of AMETEK, Inc. Sorensen is a trademark owned by
AMETEK, Inc. Other trademarks, registered trademarks, and product names are the property
of their respective owners and are used herein for identification purposes only.

Notice of Copyright

XG Family Programmable DC Power Supply Operating Manual (firmware v 2.0 and higher) ©
2008-2014 AMETEK Programmable Power, Inc. All rights reserved.

Exclusion for Documentation

UNLESS SPECIFICALLY AGREED TO IN WRITING, AMETEK PROGRAMMABLE POWER,

INC. (“AMETEK”):

(a) MAKES NO WARRANTY AS TO THE ACCURACY, SUFFICIENCY OR SUITABILITY OF

ANY TECHNICAL OR OTHER INFORMATION PROVIDED IN ITS MANUALS OR
OTHER DOCUMENTATION.

(b) ASSUMES NO RESPONSIBILITY OR LIABILITY FOR LOSSES, DAMAGES, COSTS

OR EXPENSES, WHETHER SPECIAL, DIRECT, INDIRECT, CONSEQUENTIAL OR
INCIDENTAL, WHICH MIGHT ARISE OUT OF THE USE OF SUCH INFORMATION.
THE USE OF ANY SUCH INFORMATION WILL BE ENTIRELY AT THE USER'S RISK,
AND

(c) REMINDS YOU THAT IF THIS MANUAL IS IN ANY LANGUAGE OTHER THAN

ENGLISH, ALTHOUGH STEPS HAVE BEEN TAKEN TO MAINTAIN THE ACCURACY
OF THE TRANSLATION, THE ACCURACY CANNOT BE GUARANTEED. APPROVED
AMETEK CONTENT IS CONTAINED WITH THE ENGLISH LANGUAGE VERSION,
WHICH IS POSTED AT WWW.PROGRAMMABLEPOWER.COM.

Date and Revision

July 2015 Revision F

Part Number

M370430-01

Contact Information

Telephone: [phone] (toll free in North America)
858 450 0085 (direct)
Fax: [phone]
Email: [e-mail]
[e-mail]
Web: www.programmablepower.com

M370430-01 Rev F i

Product Family: XG Family Programmable DC Power Supply

Warranty Period: Five Years

WARRANTY TERMS

AMETEK Programmable Power, Inc. (“AMETEK”), provides this written warranty covering the

Product stated above, and if the Buyer discovers and notifies AMETEK in writing of any defect
in material or workmanship within the applicable warranty period stated above, then AMETEK
may, at its option: repair or replace the Product; or issue a credit note for the defective Product;
or provide the Buyer with replacement parts for the Product.

The Buyer will, at its expense, return the defective Product or parts thereof to AMETEK in
accordance with the return procedure specified below. AMETEK will, at its expense, deliver the
repaired or replaced Product or parts to the Buyer. Any warranty of AMETEK will not apply if
the Buyer is in default under the Purchase Order Agreement or where the Product or any part
thereof:

 is damaged by misuse, accident, negligence or failure to maintain the same as

specified or required by AMETEK;

 is damaged by modifications, alterations or attachments thereto which are not

authorized by AMETEK;

 is installed or operated contrary to the instructions of AMETEK;
 is opened, modified or disassembled in any way without AMETEK's consent; or

 is used in combination with items, articles or materials not authorized by AMETEK.

The Buyer may not assert any claim that the Products are not in conformity with any warranty
until the Buyer has made all payments to AMETEK provided for in the Purchase Order
Agreement.

PRODUCT RETURN PROCEDURE

1. Request a Return Material Authorization (RMA) number from the repair facility (must be
done in the country in which it was purchased):

 In the USA, contact the AMETEK Repair Department prior to the return of the

product to AMETEK for repair:
Telephone: [phone], ext. 2295 or ext. 2463 (toll free North America)

858-450-0085, ext. 2295 or ext. 2463 (direct)

 Outside the United States, contact the nearest Authorized Service Center (ASC). A

full listing can be found either through your local distributor or our website,
www.programmablepower.com, by clicking Support and going to the Service Centers
tab.

2. When requesting an RMA, have the following information ready:

 Model number.
 Serial number
 Description of the problem

NOTE: Unauthorized returns will not be accepted and will be returned at the shipper's
expense.

NOTE: A returned product found upon inspection by AMETEK, to be in specification is subject
to an evaluation fee and applicable freight charges.

ii M370430-01 Rev F

Purpose

The Operating Manual provides installation and operating information
for the XG Family Programmable DC Power Supply.

Scope

The Manual provides safety information, features and specifications,
installation procedures, functional test procedures, and operating
procedures for both local (front panel) operation and remote operation.

The Manual also provides information on the GPIB interface option and
LXI compliant Ethernet (ENET) interface for models with the MEB
options.

Audience

The Manual is intended for the user who is familiar with electronic
power supplies, Constant Voltage, Constant Current, and/or Constant
Power operating modes, and the control of output power. The user
should be familiar with practicing safe techniques while making
supply or pin connections.

Conventions Used

The following conventions are used in this guide.

WARNING

Warnings identify conditions or practices that could result in personal
injury or loss of life.

CAUTION

Cautions identify conditions or practices that could result in damage to the
unit or other equipment.

Important: Important notes provide information that is important for you
to know. They are not as serious as Warnings or Cautions.

About This Manual (firmware v2.0 and higher)

M370430-01 Rev F iii

More information about AMETEK Programmable as well as its products and
services, is available at www.programmablepower.com.

Acronym

Definition

APG

Analog Programming

AUX

Auxiliary

ENET

Ethernet

FGA

Finished Goods Assembly

ISOL

Isolated Analog Programming

OCP

Over Current Protection

OTP

Over Temperature Protection

OVP

Over Voltage Protection

PSU

Power Supply Unit

TVS

Transient Voltage Suppressor

UVP

Under Voltage Protection

Segment

For display and readback information on the
output voltage and current displays.

Command body text

Represents SCPI commands.

About This Manual

Related Information

Acronyms

Font Conventions

This Manual uses the following typographical conventions:

iv M370430-01 Rev F

WARNING: High energy and high voltage

Exercise caution when using a power supply. High energy levels can be stored
at the output voltage terminals on a power supply in normal operation. In
addition, potentially lethal voltages exist in the power circuit and on the output
and sense connectors of a power supply with a rated output greater than 40 V.
Filter capacitors store potentially dangerous energy for some time after power is
removed.

WARNING: Fire hazard

Operate the power supply in an environment free of flammable gases or fumes.
To ensure that the power supply's safety features are not compromised, use the
power supply as specified in this Manual and do not substitute parts or make any
unauthorized modifications. If service is necessary, please return the power
supply to the Authorized Service Center. See the Warranty on page ii.

WARNING: Limitations on use

The XG Family Programmable DC Power Supply is not intended for use in
connection with life support systems or other medical equipment or devices.

CAUTION: For use as a battery charger

When you are using a power supply for battery charging applications, it is
essential to provide an appropriately sized fuse or circuit breaker in series
between the power supply output and the battery.
Installation of a protector (fuse or DC circuit breaker), rated for about 115% of
the maximum current rating of the power supply and designed specifically to
interrupt the DC voltage of the battery, will provide adequate current protection.
Where several power supplies are in parallel, it is best to fuse each power supply
rather than use one fuse at the battery.

Alternating Current

On (Supply)

Earth (Ground) Terminal

Off (Supply)

Protective Conductor Terminal

Caution (Check the Manualfor
additional information.)

Important Safety Instructions

Power Supply Safety Markings

M370430-01 Rev F v

WARNING: Keep these instructions

This chapter contains important safety and operating instructions. Read and
keep this Operating Manual for future reference.

1. Before installing and using the XG Family Programmable DC

Power Supply, read all instructions and cautionary markings on the
instrument and all appropriate sections of this Manual.

2. This instrument is for indoor use only. Do not expose the instrument

to moisture. To reduce risk of fire hazard, do not cover or obstruct
the ventilation openings. Be sure to install the instrument in a
compartment which allows air to reach the ventilation inlets on the
front and rear of the unit to prevent overheating. For more
information, see “Ventilation” on page 2-4.

3. To avoid a risk of fire and electric shock, make sure that the existing

wiring is in good condition and the wire is not undersized. Do not
operate the instrument with damaged or substandard wiring.

4. Do not operate the instrument if it has received a sharp blow, been

dropped, or otherwise damaged in any way. If the instrument is
damaged, see the Warranty on page ii.

5. Do not disassemble the instrument. It contains no user-serviceable

parts. See the Warranty on page ii for instructions on obtaining
service. Attempting to service the instrument yourself may result in
a risk of electrical shock or fire. Internal capacitors remain charged
after all power is disconnected.

6. To reduce the risk of electrical shock, disconnect AC power from

the instrument before attempting any maintenance or cleaning or
working on any circuits connected to the instrument. Turning off
controls will not reduce this risk.

Safety

Standard Warnings

vi M370430-01 Rev F

Contents

1 INTRODUCTION ............................................................................................. 1-1

FEATURES AND OPTIONS ................................................................................... 1-2

XG MODELS (FIRMWARE VERSION 2.0 AND HIGHER) ............................................ 1-3

FRONT PANEL ................................................................................................... 1-5

Front Panel Display and Controls ........................................................................... 1-6

REAR PANEL CONNECTORS ON 850 WATT MODELS ............................................ 1-7

REAR PANEL CONNECTORS ON 1500 AND 1700 WATT MODELS ............................ 1-9

2 INSTALLATION .............................................................................................. 2-1

BASIC SETUP PROCEDURE ................................................................................ 2-2

STEP 1: INSPECTING AND CLEANING ................................................................... 2-3

Initial Inspection ...................................................................................................... 2-3

Periodic Cleaning .................................................................................................... 2-3

STEP 2: LOCATION AND MOUNTING .................................................................... 2-4

Rack Mounting ........................................................................................................ 2-4

Purchasing Rack Mount Kits ................................................................................... 2-4

Ventilation ............................................................................................................... 2-4

STEP 3: CONNECTING AC INPUT POWER ............................................................ 2-5

XG 850 Watt AC Input Connector........................................................................... 2-5

XG 1500 and 1700 Watt AC Input Connector ........................................................ 2-6

XG 1500 and 1700 Watt AC Input Wire .................................................................. 2-6

XG 1500 and 1700 Watt AC Input Wire Connection .............................................. 2-7

STEP 4: SELECTING LOAD WIRES ....................................................................... 2-8

Load Wiring ............................................................................................................. 2-8

Insulation Rating ..................................................................................................... 2-8

Current Carrying Capacity ...................................................................................... 2-8

Maximum Load Wiring Length For Operation With Sense Lines ........................... 2-9

Noise and Impedance Effects ................................................................................. 2-9

STEP 5: PERFORMING FUNCTIONAL TESTS ....................................................... 2-10

Powering the Power Supply On/Off ...................................................................... 2-10

Voltage and Current Mode Operation Checks ...................................................... 2-11

STEP 6: CONNECTING LOADS .......................................................................... 2-12

DC Output Connectors ......................................................................................... 2-12

Inductive Loads and Batteries .............................................................................. 2-13

Connecting Single Loads ...................................................................................... 2-14

Connecting Multiple Loads ................................................................................... 2-14

STEP 7: CONNECTING REMOTE SENSING .......................................................... 2-15

M370430-01 Rev F vii

Contents

3 LOCAL OPERATION ...................................................................................... 3-1

INTRODUCTION ................................................................................................. 3-2

CONFIGURING SETTINGS FROM THE FRONT PANEL ............................................. 3-2

Using the 9-Position Mode Control ......................................................................... 3-2

Using the Rotary Adjust/Enter Control .................................................................... 3-2

Coarse and Fine Adjustment Modes ...................................................................... 3-3

NAVIGATING THE MENU SYSTEM ........................................................................ 3-4

Setting VOLTS and AMPS Modes .......................................................................... 3-4

Normal Display Mode and Inactivity Timeout ......................................................... 3-6

DISPLAY MESSAGES ON THE FRONT PANEL ........................................................ 3-8

STANDARD (LOCAL) OPERATION ...................................................................... 3-10

Operating Modes .................................................................................................. 3-10

Shipped Configuration (Local Operation) ............................................................. 3-16

ENABLING THE OUTPUT ................................................................................... 3-16

ENABLING THE AUXILIARY OUTPUT ................................................................... 3-17

OUTPUT AUTO START MODE (AUTO RESTART) ................................................. 3-17

AUXILIARY AUTO START MODE ........................................................................ 3-18

CONSTANT POWER MODE (VERSION 2.21 AND HIGHER) ..................................... 3-18

ALARMS AND ERRORS ..................................................................................... 3-20

Clearing Alarms .................................................................................................... 3-21

Front Panel ALARM LED ...................................................................................... 3-22

Alarm Masking ...................................................................................................... 3-23

Alarm Output Latching .......................................................................................... 3-24

SETTING FOLDBACK MODE .............................................................................. 3-25

Resetting Activated Foldback Protection .............................................................. 3-26

USING OVER VOLTAGE PROTECTION (OVP) ..................................................... 3-27

Defining the OVP Set Point .................................................................................. 3-28

USING UNDER VOLTAGE PROTECTION (UVP) ................................................... 3-29

Defining the UVP Set Point ................................................................................... 3-29

OVER CURRENT PROTECTION (OCP) ............................................................... 3-30

USING OVER TEMPERATURE PROTECTION LOCK (OTP) .................................... 3-31

Defining the OTP Mode ........................................................................................ 3-31

Resetting in Latch Mode ....................................................................................... 3-31

USING THE EXTERNAL SHUTDOWN FUNCTION ................................................... 3-32

Activating the External Shutdown Function .......................................................... 3-32

Controlling the External Shutdown Function ........................................................ 3-32

Defining the Polarity of the External Shutdown Signal ......................................... 3-33

LOOP PROTECTION (VERSION 2.21 AND HIGHER) ............................................... 3-33

Setting up Loop Protection ................................................................................... 3-34

INTERLOCK FUNCTION ..................................................................................... 3-35

viii M370430-01 Rev F

Defining the Interlock Mode .................................................................................. 3-35

OUTPUT PROTECTION ..................................................................................... 3-35

Programming Voltage Output Preset .................................................................... 3-35

Programming Current Output Preset .................................................................... 3-36

Power On Status Signal ........................................................................................ 3-37

HARDWARE MALFUNCTION ALARMS ................................................................. 3-37

CURRENT CONFIGURATION MEMORY SETTINGS ................................................ 3-38

USER SETTING MEMORY LOCATIONS ............................................................... 3-39

Saving User Setting Memory Locations ............................................................... 3-40

Recalling User Setting Memory Locations ............................................................ 3-40

LOCAL LOCKOUT ............................................................................................. 3-41

Enabling Local Lockout ......................................................................................... 3-41

Disabling Local Lockout ........................................................................................ 3-41

RESETTING THE POWER SUPPLY...................................................................... 3-42

USING MULTIPLE POWER SUPPLIES ................................................................. 3-44

Configuring Multiple Supplies for Series Operation .............................................. 3-46

Configuring Multiple Supplies for Current Sharing Operation (APG Method) ...... 3-49

Connecting to the Load in Local Sensing Mode (Parallel Control Method) .......... 3-51

Connecting to the Load in Remote Sensing Mode (Parallel Control Method) ...... 3-52

Contents

4 ANALOG PROGRAMMING (APG) AND ISOLATED ANALOG

PROGRAMMING (ISOL) ................................................................................. 4-1

INTRODUCTION ................................................................................................. 4-2

Analog Programming (APG) of Output Voltage and Output Current ...................... 4-2

Remote Programming Options ............................................................................... 4-3

Analog Programming (APG) Connector J1 ............................................................ 4-5

ANALOG PROGRAMMING MODE .......................................................................... 4-9

Analog Programming With External Voltage Source .............................................. 4-9

Voltage-Controlled Voltage APG Setup ................................................................ 4-10

Voltage-Controlled Current APG Setup ................................................................ 4-12

Resistive-Controlled Voltage APG Setup ............................................................. 4-15

Resistive-Controlled Current APG Setup ............................................................. 4-17

Voltage and Current Readback ............................................................................ 4-19

ISOLATED ANALOG PROGRAMMING MODE (ISOL) ............................................. 4-20

AUX Output and Isolated Analog Programming (ISOL) Connector ...................... 4-20

Voltage-Controlled Voltage ISOL Setup ............................................................... 4-23

Voltage-Controlled Current ISOL Setup ............................................................... 4-25

Resistive-Controlled Voltage ISOL Setup ............................................................. 4-28

Resistive-Controlled Current ISOL Setup ............................................................. 4-30

VOLTAGE AND CURRENT READBACK (ISOLATED) ............................................... 4-32

M370430-01 Rev F ix

Contents

5 REMOTE OPERATION ................................................................................... 5-1

INTRODUCTION ................................................................................................. 5-2

HARDWARE AND CONNECTION SETUP ................................................................ 5-2

Configuring Remote Control Using RS-232 ............................................................ 5-2

Configuring Remote Control Using RS-485 ............................................................ 5-7

Configuring Remote Control using the USB Connector ......................................... 5-9

Setting Up the PC to Use the USB Connection ...................................................... 5-9

GPIB Connector (Optional) ................................................................................... 5-15

Ethernet/LAN (ENET) Connector (Optional) ......................................................... 5-19

Multiple Power Supply Connections to RS-485 Bus............................................. 5-19

TERMINAL CONFIGURATION ............................................................................. 5-21

Data Format .......................................................................................................... 5-21

End of Message .................................................................................................... 5-21

HyperTerminal ...................................................................................................... 5-21

Selecting the Appropriate Communication Port .................................................... 5-24

Multichannel Address Setting ............................................................................... 5-25

Remote Interface Addressing ............................................................................... 5-26

Multichannel Commands Explained ..................................................................... 5-27

Status Reporting in SCPI ...................................................................................... 5-29

STATUS REGISTERS MODEL FROM IEEE 488.2 ................................................. 5-31

STATUS BYTE ................................................................................................. 5-32

Error/Event Queue (ERR) ..................................................................................... 5-32

Questionable Status Register Summary (QSR) ................................................... 5-32

Message Available (MAV) .................................................................................... 5-33

Standard Event Status Summary (ESB) ............................................................... 5-33

Master Summary Status (MSS) ............................................................................ 5-33

Request Service (RQS) ........................................................................................ 5-33

Operation Status Register Summary (OSR) ......................................................... 5-34

Standard Event Status Register (SESR) .............................................................. 5-35

STANDARD SCPI REGISTER STRUCTURE ......................................................... 5-38

OPERATION STATUS REGISTER ...................................................................... 5-39

CURRENT SHARE SUB-REGISTER .................................................................... 5-42

Operation Status Register Commands ................................................................. 5-43

Current Sharing Sub-Register Commands ........................................................... 5-44

Shutdown Sub-Register Commands .................................................................... 5-45

Protection Sub-Register Commands .................................................................... 5-46

QUESTIONABLE STATUS REGISTER ................................................................. 5-47

VOLTage Sub-Register ........................................................................................ 5-50

TEMPerature Sub-Register .................................................................................. 5-50

Questionable Status Register Commands ........................................................... 5-51

x M370430-01 Rev F

Voltage Status Register Commands..................................................................... 5-52

Temperature Status Register Commands ............................................................ 5-53

SCPI ERROR/EVENT QUEUE ........................................................................... 5-54

Reset Command ................................................................................................... 5-56

Clear All Status Registers ..................................................................................... 5-57

SCPI Preset Status ............................................................................................... 5-58

Command Line Help System ................................................................................ 5-59

LOCKING AND UNLOCKING THE FRONT PANEL ................................................... 5-62

Auto Sequence Programming ............................................................................... 5-62

CONFIGURE OTHER PROTECTION MECHANISMS ................................................ 5-68

Foldback Protection .............................................................................................. 5-68

Over Temperature Protection ............................................................................... 5-69

Loop Protection Enable/Disable ........................................................................... 5-69

Interlock Enable/Disable ....................................................................................... 5-70

Save and Recall .................................................................................................... 5-71

Set Analog Programming Level ............................................................................ 5-71

Set Remote Programming Interface ..................................................................... 5-72

Protection Mask (Enable Alarms) ......................................................................... 5-73

Power Saving Control (Sleep Mode, XG 1700 W Only) ....................................... 5-74

Contents

6 COMMUNICATIONS OPTIONS ...................................................................... 6-1

INTRODUCTION ............................................................................................. 6-2

SETTING UP LAN/ETHERNET ....................................................................... 6-3

Basics ..................................................................................................................... 6-3

LOCAL AREA NETWORK (LAN) OPTION ....................................................... 6-5

Media Access Control (MAC) Address ................................................................... 6-5

Communication Configuration ................................................................................ 6-6

LAN Connection ...................................................................................................... 6-6

Direct-to-PC Connection ......................................................................................... 6-6

Private Network Connection ................................................................................... 6-7

CONNECTING TO A NETWORK .................................................................... 6-8

Connecting with PC on Same Side of Router as Power Supply ............................ 6-8

Connecting with Power Supply Hidden Behind a Router ..................................... 6-10

Socket Port Number.............................................................................................. 6-12

Instrument Drivers and Application Software ....................................................... 6-13

AMETEK LXI DISCOVERY BROWSER ......................................................... 6-13

Installing the AMETEK LXI Discovery Browser .................................................... 6-13

Using the AMETEK LXI Discovery Browser ......................................................... 6-21

AMETEK ENETTEST UTILITY ......................................................................... 6-22

Installing the AMETEK EnetTest Utility................................................................. 6-22

Using the AMETEK Ethernet Test Utility .............................................................. 6-28

M370430-01 Rev F xi

Contents

SETTING LAN PARAMETERS ...................................................................... 6-29

Setting LAN Parameters via Ethernet ................................................................... 6-29

Setting LAN Parameters via Serial or USB Port ................................................... 6-29

Setting LAN Parameters via Web Interface .......................................................... 6-30

SETTING A STATIC IP ADDRESS THROUGH ETHERNET, USB, SERIAL INTERFACES

...................................................................................................................... 6-35

Ethernet ................................................................................................................ 6-35

USB ....................................................................................................................... 6-36

RS232 (SERIAL) ................................................................................................... 6-44

SYSTEM COMMANDS.................................................................................. 6-53

Subsystem Syntax ................................................................................................ 6-53

LXI COMPLIANCE ........................................................................................ 6-56

Introduction to the LXI Standard ........................................................................... 6-57

VXI Discovery ....................................................................................................... 6-57

LAN Requirements................................................................................................ 6-57

Web Page ............................................................................................................. 6-57

Remote Procedure Calls (RPC) ............................................................................ 6-58

Drivers ................................................................................................................... 6-58

7 CALIBRATION AND TROUBLESHOOTING .................................................. 7-1

INTRODUCTION ................................................................................................. 7-2

MAIN VOLTAGE AND CURRENT CALIBRATION PRINCIPLE ...................................... 7-3

Understanding the Problem .................................................................................... 7-3

Step 1: Gain Calibration .......................................................................................... 7-4

Step 2: Offset Calibration ........................................................................................ 7-4

Step 3: Recalibrate Gain ......................................................................................... 7-5

STORING CALIBRATION DATA ............................................................................. 7-5

CALIBRATING THE OUTPUT VOLTAGE.................................................................. 7-6

Gain Calibration ...................................................................................................... 7-6

Offset Calibration .................................................................................................... 7-6

CALIBRATING THE OUTPUT CURRENT ................................................................. 7-7

Gain Calibration ...................................................................................................... 7-7

Offset Calibration .................................................................................................... 7-8

OVER VOLTAGE PROTECTION CALIBRATION ........................................................ 7-9

NON-ISOLATED ANALOG PROGRAMMING CALIBRATION ...................................... 7-10

Non-isolated Voltage Monitoring Calibration ........................................................ 7-10

Non-isolated Current Monitoring Calibration ........................................................ 7-11

Non-isolated Voltage Programming of Voltage Calibration .................................. 7-12

Non-isolated Resistive Programming of Voltage Calibration ................................ 7-13

Non-isolated Voltage Programming of Current Calibration .................................. 7-14

Non-isolated Resistive Programming of Current Calibration ................................ 7-15

xii M370430-01 Rev F

CALIBRATION PROCEDURE FOR ISOLATED MODES ............................................ 7-16

Isolated Voltage Monitoring Calibration ................................................................ 7-16

Isolated Current Monitoring Calibration ................................................................ 7-17

Isolated Voltage Programming of Voltage Calibration .......................................... 7-18

Isolated Resistive Programming of Voltage Calibration ....................................... 7-19

Isolated Voltage Programming of Current Calibration .......................................... 7-20

Isolated Resistive Programming of Current Calibration........................................ 7-21

Calibrating the Input Voltage APG Signal ............................................................. 7-22

Calibrating the Input Current APG Signal ............................................................. 7-23

RESTORE FACTORY CALIBRATION .................................................................... 7-25

RESTORE DEFAULT CALIBRATION .................................................................... 7-25

USER DIAGNOSTICS ........................................................................................ 7-25

Emergency Shutdown ........................................................................................... 7-26

Unusual or Erratic Operation ................................................................................ 7-26

Troubleshooting for Operators .............................................................................. 7-27

APPENDIX A SCPI COMMAND REFERENCE .................................................... A-1

SCPI CONFORMANCE INFORMATION ................................................................. A-2

Codes and Standards ............................................................................................ A-2

IEEE 488.2/SCPI Syntax and Style ....................................................................... A-2

SCPI Command Hierarchy .................................................................................... A-3

Using SCPI Commands ......................................................................................... A-4

Parameter Types ................................................................................................... A-7

SCPI COMMAND TREE ..................................................................................... A-8

SCPI Command Summary .................................................................................. A-14

APPENDIX B ERROR MESSAGES ................................................................... B-1

ERROR MESSAGES .......................................................................................... B-2

Command Error List ............................................................................................... B-3

Execution Error List................................................................................................ B-4

Device-Specific Error List ...................................................................................... B-5

Query Error List ...................................................................................................... B-6

APPENDIX C SPECIFICATIONS ....................................................................... C-1

ELECTRICAL SPECIFICATIONS FOR XG FAMILY, 850 W ....................................... C-2

AC Line Input Specifications for XG 850 Watt ....................................................... C-3

ELECTRICAL SPECIFICATIONS FOR XG FAMILY, 1500 W ..................................... C-4

AC Line Input Specifications for XG 1500 Watt ..................................................... C-5

ELECTRICAL SPECIFICATIONS FOR XG FAMILY, 1700 W ..................................... C-6

AC Line Input Specifications for XG 1700 Watt ..................................................... C-7

REMOTE OPERATION PROGRAMMING ................................................................ C-8

COMMON SPECIFICATIONS FOR ALL MODELS ................................ ..................... C-9

APPENDIX D RACK MOUNT OPTIONS AND INSTALLATION INSTRUCTIONS.......... D-1

Contents

M370430-01 Rev F xiii

Contents

RACK MOUNT KIT OPTIONS .............................................................................. D-2

XG Single (Half Rack) and Dual (Full Rack) .......................................................... D-2

Location Requirements .......................................................................................... D-3

MOUNTING OPTION A: 1U RAILS ....................................................................... D-4

Tools and Materials Required ................................................................................ D-4

Installation Procedures .......................................................................................... D-4

MOUNTING OPTION B: MANUFACTURED SLIDES FROM JONATHAN® ENGINEERED

SOLUTIONS ...................................................................................................... D-6

APPENDIX E LANTRONIX PROCEDURES FOR MEA OPTION ............................. E-1

INTRODUCTION ................................................................................................ E-2

Setting Up the Computer ....................................................................................... E-2

Software Installations ............................................................................................. E-4

Configuring the Device Using DeviceInstaller ....................................................... E-6

Terminal Configuration ........................................................................................ E-12

Advanced Section ................................................................................................ E-17

Network Topology 1: Simple LAN ........................................................................ E-17

Network Topology 2: ENET and RS-485 Bus ...................................................... E-20

Troubleshooting for XG 850W Model with ENET and/or RS-485 Communication

............................................................................................................................. E-23

INDEX .................................................................................................................. 1

Figures

Figure 1-1 XG Front Panels (Half Rack, above; Full Rack, below; not to-scale) ............. 1-5

Figure 1-2 Front Panel Display and Controls ................................................................... 1-6

Figure 1-3 XG 850 Watt Units: 6 V to 40 V Models .......................................................... 1-7

Figure 1-4 XG 850 Watt Units: 60 V to 150 V Models ..................................................... 1-7

Figure 1-5 XG 850 Watt Units: 300 V to 600 V Models .................................................... 1-7

Figure 1-6 XG 1500 and 1700 Watt Units: 6 V to 40 V Models ........................................ 1-9

Figure 1-7 XG 1500 and 1700 Watt Units: 60 V to 600 V Models .................................. 1-10

Figure 2-1 1500 and 1700 Watt AC Input Cover and Strain Relief .................................. 2-6

Figure 2-2 Maximum Load Wire Length for 1 V Line Drop ............................................... 2-9

Figure 2-3 Diode Placement ........................................................................................... 2-13

Figure 2-4 Connecting Single Loads .............................................................................. 2-14

Figure 2-5 Remote Sense Connection ........................................................................... 2-15

Figure 3-1 9-Position Mode Control .................................................................................. 3-2

Figure 3-2 Front Panel Menu System ............................................................................... 3-7

Figure 3-3 Operating Modes ........................................................................................... 3-13

Figure 3-4 Split Supply Operation .................................................................................. 3-45

Figure 3-5 Series Operation ........................................................................................... 3-47

Figure 3-6 Load Connections in Remote Sensing Mode ................................................ 3-48

Figure 3-7 Load Connections in Local Sensing Mode .................................................... 3-51

Figure 3-8 Load Connections in Remote Sensing Mode (Parallel Control Method) ...... 3-52

Figure 4-1 APG Connector Terminals .............................................................................. 4-5

Figure 4-2 Inserting Screwdriver into Spring Terminal Block ........................................... 4-7

Figure 4-3 APG and DC Output Connector ...................................................................... 4-7

xiv M370430-01 Rev F

Contents

Figure 4-4 Programming Output Voltage using an External Voltage Source ................... 4-9

Figure 4-5 Programming Output Current using an External Voltage Source ................... 4-9

Figure 4-6 Programming Output Voltage using an External Resistor ............................ 4-14

Figure 4-7 Programming Output Current using an External Resistor ............................ 4-14

Figure 4-8 Voltage Readback Using APG Connector J1 ............................................... 4-19

Figure 4-9 Current Readback Using APG Connector J1 ................................................ 4-19

Figure 4-10 AUX Output and ISOL Connector Pinout ...................................................... 4-20

Figure 4-11 Programming Output Voltage using an Isolated External Voltage Source ... 4-22
Figure 4-12 Programming Output Current using an Isolated External Voltage Source ... 4-22

Figure 4-13 Programming Output Voltage using an Isolated External Resistor .............. 4-27

Figure 4-14 Programming Output Current using an Isolated External Resistor ............... 4-27

Figure 4-15 Isolated Voltage Monitoring........................................................................... 4-32

Figure 4-16 Isolated Current Monitoring ........................................................................... 4-32

Figure 5-1 Remote Control Connectors............................................................................ 5-3

Figure 5-2 RS-232 Communication Cable with DB-9 Pinout............................................ 5-5

Figure 5-3 DB-25 Pinout ................................................................................................... 5-5

Figure 5-4 RS-232 Communication Cable with DB-25 Pinout.......................................... 5-6

Figure 5-5 RS-485 Communication Cable with DB-9 ....................................................... 5-7

Figure 5-6 RS-485 Communication Cable from Master to Slave Unit .............................. 5-8

Figure 5-7 Found New Hardware Wizard ....................................................................... 5-10

Figure 5-8 Install Hardware Device Drivers .................................................................... 5-10

Figure 5-9 Completing the New Hardware Wizard ......................................................... 5-11

Figure 5-10 Device Manager ............................................................................................ 5-12

Figure 5-11 Communications Port (COM1) Properties .................................................... 5-13

Figure 5-12 Completing the new hardware wizard ........................................................... 5-13

Figure 5-13 Scanning for Instruments .............................................................................. 5-17

Figure 5-14 Instrument Properties ................................................................................... 5-18

Figure 5-15 Multi Power Supply Connection to RS-485 Bus............................................ 5-19

Figure 5-16 USB Settings ................................................................................................. 5-22

Figure 5-17 ASCII Setup .................................................................................................. 5-23

Figure 5-18 SCPI Status Reporting Model ....................................................................... 5-30

Figure 5-19 IEEE 488.2 Register Model ........................................................................... 5-31

Figure 5-20 Summary of Standard Event Status Register ............................................... 5-36

Figure 5-21 SCPI Register Model ..................................................................................... 5-38

Figure 5-22 Operation Status Register Fanout ................................................................ 5-39

Figure 5-23 SCPI QUEStionable Registers Fanout ......................................................... 5-48

Figure 6-1 Computer or HUB Plug ................................................................................... 6-3

Figure 6-2 Power Supply Plug .......................................................................................... 6-3

Figure 6-3 RJ-45 Plug....................................................................................................... 6-3

Figure 6-4 Scheme of ENET Cross-Cable ....................................................................... 6-4

Figure 6-5 XPort® ENET Connector and LEDs ............................................................... 6-4

Figure 6-6 Single Computer, Single Power Supply .......................................................... 6-6

Figure 6-7 PC on Same Side of Router as Power Supply................................................ 6-8

Figure 6-8 Home Page ..................................................................................................... 6-9

Figure 6-9 AMETEK LXI Discovery Browser .................................................................... 6-9

Figure 6-10 Power Supply Hidden Behind a Router ........................................................ 6-10

Figure 6-11 Router Home Page ....................................................................................... 6-11

Figure 6-12 Port Forwarding ............................................................................................. 6-12

Figure 7-1 Offset (Intercept) Error and Gain (Slope) Error ............................................... 7-3

Figure 7-2 Calibration: Step 1 Gain Calibration ................................................................ 7-4

Figure 7-3 Calibration: Step 2 Offset Calibration .............................................................. 7-4

Figure 7-4 Calibration: Step 3 Recalibrate Gain ............................................................... 7-5

M370430-01 Rev F xv

Contents

Figure C-1 XG 850 Watt Mechanical Dimensions: 6 to 40 V Models ............................ C-11

Figure C-2 XG 850 Watt Mechanical Dimensions: 60 V to 600 V Models ..................... C-12

Figure C-3 XG in Full Rack Mechanical Dimensions: 6 V to 40 V Models .................... C-13

Figure C-4 XG in Full Rack Mechanical Dimensions: 6 V to 40 V Models DC Output Cover

C-14

Figure C-5 XG in Full Rack Mechanical Dimensions: 60 V to 600 V Models ................ C-15

Figure C-6 XG in Full Rack Mechanical Dimensions: 60 V to 600 V Models w/DC Output

Cover ............................................................................................................ C-16

Figure C-7 XG850 with Full Rack and Foot Options, Front, Side, and Rear Views ...... C-17

Figure C-8 XG850 Standard in Full Rack Option ........................................................... C-17

Figure C-9 XG850 Low Voltage Model Dimensions, Top, Side, and Rear .................... C-18

Figure C-10 XG850 Medium and High Voltage Models Dimensions, Top and Rear ....... C-19

Figure C-11 XG850 with Front Panel Output Voltage Option*, Top, Side, and Rear ....... C-20

Figure D-1 Single (left,) and Dual (right) Half Rack Mount Kit Options ............................ D-2

Figure D-2 Full Rack Mount Kit Option ............................................................................. D-3

Figure D-3 RM-XG1 Rack Rails ....................................................................................... D-5

Figure D-4 Finding Rack Depth ........................................................................................ D-6

Figure D-5 Selecting a Rail Type...................................................................................... D-7

Figure D-6 Modifying Rear Bracket .................................................................................. D-8

Figure D-7 Removing Chassis Member From Slides ....................................................... D-8

Figure D-8 Attaching Front and Rear Bracket To Cabinet Section .................................. D-9

Figure D-9 Mounting Cabinet Section Into Rack ............................................................ D-10

Figure D-10 Installing Chassis .......................................................................................... D-11

Figure E-1 Configuring the Network Connection of the Computer ................................... E-2

Figure E-2 LAN Properties Dialog Box ............................................................................. E-3

Figure E-3 Internet Protocol (TCP/IP) Properties Dialog Box .......................................... E-4

Figure E-4 DeviceInstaller Setup Wizard ......................................................................... E-5

Figure E-5 Select Installation Folder Window .................................................................. E-6

Figure E-6 Multiple Network Adapters ............................................................................. E-7

Figure E-7 Selecting Network Adapter ............................................................................. E-7

Figure E-8 Auto-IP Address Message .............................................................................. E-8

Figure E-9 Searching for Power Supply IP Address ........................................................ E-8

Figure E-10 IP Address Details Window ............................................................................ E-9

Figure E-11 Entering the Lantronix Interface ................................................................... E-10

Figure E-12 Lantronix XPort® Interface ........................................................................... E-10

Figure E-13 Assigning IP Settings ................................................................................... E-11

Figure E-14 HyperTerminal Connection ........................................................................... E-13

Figure E-15 Connection Description Window .................................................................. E-13

Figure E-16 New Connection Dialog Box ......................................................................... E-14

Figure E-17 Main Terminal Window ................................................................................. E-15

Figure E-18 ENET Properties Window ............................................................................. E-15

Figure E-19 ENET Properties Dialog Box ........................................................................ E-16

Figure E-20 ASCII Setup Dialog Box ............................................................................... E-17

Figure E-21 Multiple Power Supplies and Two Computers ............................................. E-18

Figure E-22 HyperTerminal Session ................................................................................ E-19

Figure E-23 System with Two Connected Devices .......................................................... E-20

Figure E-24 ENET and RS-485 Bus ................................................................................ E-21

Figure E-25 HyperTerminal Window ................................................................................ E-21

xvi M370430-01 Rev F

Contents

Tables

Table 1-1 XG 850 Watt Series Voltage and Current Ranges ......................................... 1-3

Table 1-2 XG 1500 Watt Series Voltage and Current Ranges ....................................... 1-4

Table 1-3 XG 1700 Watt Series Voltage and Current Ranges ....................................... 1-4

Table 2-1 Basic Setup Procedure ................................................................................... 2-2

Table 2-2 XG 1500 and 1700 Watt: Recommended AC Input Wire (higher power) ....... 2-6

Table 2-3 Current Carrying Capacity for Load Wiring ..................................................... 2-8

Table 3-1 Select and Set from the Front Panel ............................................................... 3-3

Table 3-2 Front Panel Display Text ................................................................................. 3-8

Table 3-3 Shipped Configuration ................................................................................... 3-16

Table 3-4 Alarm Order of Precedence .......................................................................... 3-20

Table 3-5 Alarm Mask Bit Positions .............................................................................. 3-23

Table 3-6 Alarm Latch Bit Positions .............................................................................. 3-24

Table 3-7 Power Cycle Saved/Recalled Settings .......................................................... 3-38

Table 3-8 User Accessible Saved/Recalled Settings Voltage Setpoint ........................ 3-39

Table 3-9 Power Supply Default Settings...................................................................... 3-42

Table 4-1 Monitor Lines ................................................................................................... 4-3

Table 4-2 Remote Programming Options........................................................................ 4-4

Table 4-3 APG Pins and Functions J1 ............................................................................ 4-5

Table 4-4 AUX Output and ISOL Connector Pins and Functions J3 ............................ 4-21

Table 5-1 Remote Control Connector Pins and Functions J4 and J61............................ 5-3

Table 5-2 DB-9 Pinouts ................................................................................................... 5-4

Table 5-3 RJ-45 Pinouts .................................................................................................. 5-4

Table 5-4 DB-25 Pinouts ................................................................................................. 5-5

Table 5-5 DB-9 Pinouts ................................................................................................... 5-7

Table 5-6 RJ-45 Plug Pinouts ......................................................................................... 5-7

Table 5-7 RJ-45 Plug on Slave Unit ................................................................................ 5-8

Table 5-8 GPIB Pin Description (J2) ............................................................................. 5-15

Table 5-9 Rules for Multichannel Responses ............................................................... 5-27

Table 5-10 Status Byte Summary Register ..................................................................... 5-32

Table 5-11 Standard Event Status Register .................................................................... 5-36

Table 5-12 OPERation Status Register........................................................................... 5-40

Table 5-13 OPERation SHUTdown Status Register ....................................................... 5-41

Table 5-14 OPERation SHUTdown PROTection Status Register .................................. 5-41

Table 5-15 OPERation CSHare Status Register ............................................................. 5-42

Table 5-16 QUEStionable Status Register ...................................................................... 5-49

Table 5-17 QUEStionable VOLTage Status Register ..................................................... 5-50

Table 5-18 QUEStionable TEMPerature Status Register ............................................... 5-50

Table 5-19 Preset Values of User Configurable Registers ............................................. 5-58

Table 5-20 Alarms Bit Mask ............................................................................................ 5-73

Table 6-1 Description of Pins on RJ-45 Plug .................................................................. 6-4

Table 6-2 Description of LEDs ........................................................................................ 6-5

Table 6-3 LAN Setting Screens ..................................................................................... 6-32

Table 6-4 Factory Default LAN Settings ........................................................................ 6-57

Table 7-1 Troubleshooting ............................................................................................ 7-27

Table A-1 IEEE 488.2 Commands ................................................................................ A-14

Table A-2 Readback Commands .................................................................................. A-16

Table A-3 SCPI Commands for Output Control ............................................................ A-17

Table A-4 SCPI Commands for Calibration .................................................................. A-18

Table A-5 SCPI Commands to Clear All Protection Mechanisms ................................ A-21

M370430-01 Rev F xvii

Contents

Table A-6 SCPI Commands for Foldback Protection ................................................... A-22

Table A-7 SCPI Commands for Power ......................................................................... A-23

Table A-8 SCPI Commands for Triggering ................................................................... A-23

Table A-9 System Commands ...................................................................................... A-24

Table A-10 Status Commands ........................................................................................ A-27

Table A-11 Protection Commands .................................................................................. A-35

Table A-12 Auto Sequence Commands ......................................................................... A-35

Table B-1 Command Error List ....................................................................................... B-3

Table B-2 Execution Error List ........................................................................................ B-4

Table B-3 Device-Specific Error List ............................................................................... B-5

Table B-4 Query Error List .............................................................................................. B-6

Table C-1 XG 850 Watt Electrical Specifications for 6 V to 600 V Models ..................... C-2

Table C-2 XG 1500 Watt Electrical Specifications for 6 V to 600 V Models ................... C-4

Table C-3 XG 1700 Watt Electrical Specifications for 6 V to 600 V Models ................... C-6

Table C-4 Remote Operation Programming ................................................................... C-8

Table C-5 Output Performance Specifications ............................................................... C-9

Table D-1 Table Rack Mount Options............................................................................. D-2

Table D-2 Part Numbers for Jonathan Manufactured Slides .......................................... D-7

Table E-1 Troubleshooting for the Combined ENET – RS-485 Communication ......... E-23

Table E-2 Troubleshooting for ENET Communication ................................................. E-24

xviii M370430-01 Rev F

1

Introduction

Chapter 1, Introduction, describes the features of the XG Family
Programmable DC Power Supply.

The XG Family Programmable DC Power Supply provides stable,
variable output voltage and current for a broad range of development and
system requirements. The power supplies have a high power density and
numerous industry standard interfaces:

 RS-232, RS-485, analog programming (APG), and USB built-in

ports.

 Optional GPIB or Ethernet (ENET), isolated analog programming

(ISOL), control for remote operation and readback.

 Seamless switching between front panel and any digital interface

(RS-232, RS-485, USB, GPIB or ENET).

 Simultaneous digital displays for both voltage and current.
 Front panel control by rotary Adjust/Enter knob, permitting high

resolution output setting.

 Active Power Factor Correction (PFC) reduces input current and

input current harmonics.

 Automatic crossover system allowing the power supply to switch

between Constant Current, Constant Voltage and Constant Power
(available in version 2.21 and higher) operating modes.

 Parallel or series connection among multiple units to produce

greater diversity or to use in higher power applications.

 Short-circuit protection of DC outputs provideing greater operating

safety.

 Built-in APG and ISOL (optional) interface to provide a

galvanically isolated analog voltage control of the output,
master/slave output tracking, and remote Enable/disable for safety
and precision.

 Remote output voltage sensing to automatically compensate for

cable losses.

 Software calibrated.
 Three user setting memory locations.
 M10 Option preprograms the voltage to reset to zero upon power on

and upon output enable.

Introduction

Features and Options

1-2 M370430-01 Rev F

1

Model

Output Voltage

Output Current

6-110

0-6 V

0-110 A

8-100

0-8 V

0-100 A

12-70

0-12 V

0-70 A

20-42

0-20 V

0-2 A

33-25

0-33 V

0-25 A

40-21

0-40 V

0-21 A

60-14

0-60 V

0-14 A

80-10.5

0-80 V

0-10.5 A

100-8.5

0-100 V

0-8.5 A

150-5.6

0-150 V

0-5.6 A

300-2.8

0-300 V

0-2.8 A

600-1.4

0-600 V

0-1.4 A

XG Models (firmware version 2.0 and higher)

Table 1-1 lists the models in the XG 850 Watt series covered by this
Manual.

Table 1-1 XG 850 Watt Series Voltage and Current Ranges

Introduction

M370430-01 Rev F 1-3

Model

Output Voltage

Output Current

6-220

0-6 V

0-220 A

8-187.5

0-8 V

0-187.5 A

12.5-120

0-12.5 V

0-120 A

20-76

0-20 V

0-76 A

30-50

0-30 V

0-50 A

40-38

0-40 V

0-38 A

60-25

0-60 V

0-25 A

80-19

0-80 V

0-19A

100-15

0-100 V

0-15 A

150-10

0-150 V

0-10 A

300-5

0-300 V

0-5 A

600-2.6

0-600 V

0-2.6 A

Model

Output Voltage

Output Current

6-220

0-6 V

0-220 A

8-200

0-8 V

0-200 A

12-140

0-12 V

0-140 A

20-84

0-20 V

0-84 A

33-50

0-33 V

0-50 A

40-42

0-40 V

0-42 A

60-28

0-60 V

0-28 A

80-21

0-80 V

0-21 A

100-17

0-100 V

0-17 A

150-11.2

0-150 V

0-11.2 A

300-5.6

0-300 V

0-5.6 A

600-2.8

0-600 V

0-2.8 A

Introduction

Table 1-2 lists the models in the XG 1500 Watt series covered by this
Manual.

Table 1-2 XG 1500 Watt Series Voltage and Current Ranges

Table 1-3 lists the models in the XG 1700 Watt series covered by this
Manual.

Table 1-3 XG 1700 Watt Series Voltage and Current Ranges

1-4 M370430-01 Rev F

1

Item

Description

1

Front panel power switch

2

Front panel display see Figure 1-2

3

Air Intake Vents

Front Panel

Introduction

Figure 1-1 XG Front Panels (Half Rack, above; Full Rack, below; not to-scale)

M370430-01 Rev F 1-5

Item

Description

1

Rotary Adjust/Enter control

2

Constant Voltage (CV) Mode LED (green)

3

Model Identification Label

4

Output Voltage Display

5

Constant Current (CC) Mode LED (green)

6

Output Current Display

7

Alarm Indicator LED (red)

8

OUTPUT ENABLE Main button

9

OUTPUT ENABLE Aux button

10

9-Position Mode Control (For detailed information, see “Configuring Settings from the Front
Panel” on page 3-2).

Introduction

Front Panel Display and Controls

Figure 1-2 Front Panel Display and Controls

1-6 M370430-01 Rev F

1

Rear Panel Connectors on 850 Watt Models

Figure 1-3 XG 850 Watt Units: 6 V to 40 V Models

Introduction

Figure 1-4 XG 850 Watt Units: 60 V to 150 V Models

Figure 1-5 XG 850 Watt Units: 300 V to 600 V Models

M370430-01 Rev F 1-7

Item

Description

1

6 V– 40 V Models: DC Output Terminal Positive
60 V–150 V Models: DC Output Connectors Positive (6.5 mm hole diameter)
300 V–600 V Models: DC Output Connectors Positive (6.5 mm hole diameter)

2

6 V– 40 V Models: DC Output Terminal Negative
60 V–150 V Models: DC Output Connectors Negative (6.5 mm hole diameter)
300 V–600 V Models: DC Output Connectors Negative (6.5 mm hole diameter)

3 (J2)

Ethernet (ENET) or GPIB Connector (optional)

4 (J4)

RS-232/RS-485 Connector In Port

5

AC Input Connector (IEC Type)

6

Chassis Ground Stud

7 (J1)

Analog Programming (APG) Connector. For pin information, see page 4-5.

8 (J3)

AUX Output and Isolated Analog Programming (ISOL) Connector. For pin information, see
page 4-20.

9 (J5)

USB Connector

10 (J6)

RS-485 Connector Multichannel Port

11

Ethernet/LAN (option) Connector

12

Fan Exhaust Vents

Introduction

1-8 M370430-01 Rev F

1

Introduction

Rear Panel Connectors on 1500 and 1700 Watt
Models

Figure 1-6 XG 1500 and 1700 Watt Units: 6 V to 40 V Models

M370430-01 Rev F 1-9

Item

Description

1

6 V– 40 V Models: DC Output Terminal Positive (8.5 mm hole diameter)
60 V–600 V Models: DC Output Connectors Positive

2

6 V– 40 V Models: DC Output Terminal Negative (8.5 mm hole diameter)
60 V–600 V Models: DC Output Connectors Negative

3 (J2)

Ethernet (ENET) or GPIB Connector (optional)

4 (J4)

RS-232/RS-485 Connector In Port

5

AC Input Terminal

6

Chassis Ground Stud

7 (J1)

Analog Programming (APG) Connector. For pin information, see page 4–5.

8 (J3)

AUX Output and Isolated Analog Programming (ISOL) Connector. For pin information, see
page 4–20.

9 (J5)

USB Connector

10 (J6)

RS-485 Connector Multichannel Port

11

Ethernet Connector

12

Fan Exhaust Vents

Introduction

Figure 1-7 XG 1500 and 1700 Watt Units: 60 V to 600 V Models

1-10 M370430-01 Rev F

2

Installation

Chapter 2, Installation, provides information and
procedures for inspecting, installing, and testing the power
supply.

Step

Description

Action

Reference

1

Inspect

Inspect the power supply.

“Step 1: Inspecting and Cleaning”
on page 2-3.

2

Install

Install the power supply
(benchtop or rack mount).
Ensure adequate ventilation.

“Step 2: Location and Mounting” on

page 2-4.

3

Connect Input
Power

Connect AC input power.

“Step 3: Connecting AC Input

Power” on page 2-5.

4

Select Wires

Select wires that are correctly
rated for the maximum DC
output current.

“Step 4: Selecting Load Wires” on

page 2-8.

5

Te s t

Perform functional tests for
voltage mode operation, current
mode operation, and front panel
controls.

“Step 5: Performing Functional

Tests” on page 2-10.

6

Connect Loads

Connect the load wires to the
DC output.

“Step 6: Connecting Loads” on

page 2-12.

7

Connect Remote
Sensing (if
required)

Connect remote sensing
connectors on power supply to
load.

“Step 7: Connecting Remote

Sensing” on page 2-15.

Installation

Basic Setup Procedure

Table 2-1 provides a summary of the basic setup procedure with references to the relevant
sections in this chapter. Refer to this table if you are unfamiliar with the installation
requirements for the power supply. Complete each step in the sequence given.

Table 2-1 Basic Setup Procedure

2-2 M370430-01 Rev F

2

Step 1: Inspecting and Cleaning

Initial Inspection

When you first receive your unit, perform a physical check:

1. Inspect the unit for any scratches and cracks, broken switches,

connectors or displays.

2. Ensure that the packing box contains the 7.5 foot (2.5 m)

power cord (supplied with the XG 850 W model only).

3. If you see external damage or suspect internal damage,

contact the carrier immediately.

Periodic Cleaning

The power supply only requires periodic cleaning, not routine servicing.
Whenever a unit is removed from operation, clean the metal surfaces
with naptha or an equivalent solvent, and clean the front panel with a
weak solution of soap and water. Use low-pressure compressed air to
blow dust from components on the printed circuit boards.

Installation

M370430-01 Rev F 2-3

Installation

Step 2: Location and Mounting

The power supply may be rack-mounted or used in benchtop applications.

Rack Mounting

The XG 850 Watt power supply is designed to fill half of a standard 19
inch (483 mm) equipment rack. The XG 1500 and 1700 Watt power
supplies are designed to fill a standard 19 inch (483 mm) equipment rack.

Units can be combined with the same models in the 850 W or 1500 and
1700 W series for customer applications.

Purchasing Rack Mount Kits

Contact Customer Service (see “Contact Information” on page i) about
purchasing the Rack Mount Kit options. For a list of the part numbers, see
Appendix D Rack Mount Kit Options. Installation information for the
different rack mount options are provided with the rack mount kits.

For product support, visit www.programmablepower.com and
navigate to the DC Power Supplies page.

Ventilation

Whether operating the power supply in a rack or on a bench, allow air to
reach the ventilation inlets on the front and rear of the unit for cooling. The
direction of airflow is from the front of the unit to the back of the unit.
Ventilation space is not required at the top, bottom or sides of the power
supply.

2-4 M370430-01 Rev F

2

WARNING: Shock hazard

Disconnect AC power from the unit before removing the cover. Even with the
front panel power switch in the Off position, live line voltages are exposed when
the cover is removed. Repairs must be made by an Authorized Service Center.

WARNING: Shock hazard

There is a potential shock hazard if the power supply chassis and cover are not
connected to an electrical ground via the safety ground in the AC input
connector. Ensure that the power supply is connected to a grounded AC outlet
with the recommended AC input cord configured for the available line voltage
as described in this section.

WARNING: Shock hazard

The AC input cord is the disconnect device for the power supply. The plug must
be a non-locking plug which is readily identifiable by and accessible to the
operator. The input cord must be no longer than 9.84 feet (3 m).

Step 3: Connecting AC Input Power

Installation

XG 850 Watt AC Input Connector

On the 850 Watt models, the AC input connector is a standard IEC 16 A
250 V male connector located on the rear panel of the power supply.
The AC input cord provided is rated for 13A, 125V. For a different AC
input cord, contact the factory for availability.

M370430-01 Rev F 2-5

AC Input Voltage Range and

Frequency

Wire Specifications

85-265 Vac, 47-63 Hz, single
phase 3 wire

3 x 10 AWG (2 wire plus safety
ground, stranded copper, 60 ºC
minimum, 300 V. The input
cord must be no longer than

9.84 feet (3 m).

Installation

XG 1500 and 1700 Watt AC Input Connector

On the XG family 1U, full 19-inch rack models, the AC input connector
is a 3-terminal wire clamp located on the rear panel of the power supply.

Figure 2-1 1500 and 1700 Watt AC Input Cover and Strain Relief

XG 1500 and 1700 Watt AC Input Wire

The full 19-inch rack models are not supplied with a power cord or a
non-locking AC plug. Table 2-2 specifies the recommended AC input
wire size. You must also purchase and install the correctly rated
non-locking plug for your installation.

Make sure that the wiring of the product and the AC plug comply with
the applicable local code for your installation. If you require a special
cord, contact Customer Service (see “Contact Information” on page i).

Table 2-2 XG 1500 and 1700 Watt: Recommended AC Input Wire (higher power)

2-6 M370430-01 Rev F

2

XG 1500 and 1700 Watt AC Input Wire Connection

To make the AC input wire connections:

1. Strip the outside insulation on the AC cable approximately 4 in. (100

mm). Trim the wires so that the ground wire is 0.5 in. (12 mm) longer
than the other wires. Strip 0.55 in. (14 mm) at the end of each of the
wires.

2. Unscrew the base of the strain relief from the helix-shaped body.

Insert the base through the outside opening in the AC input cover and,
from the inside, screw the locknut securely onto the base.

3. Slide the helix-shaped body onto the AC cable. Insert the stripped

wires through the strain relief base until the outer cable jacket is flush
with the edge of the base. Tighten the body to the base while holding
the cable in place. The cable is now securely fastened inside the strain
relief.

4. Route the AC wires to the input connector terminals as required. For

AC input terminal locations, see lower inset in Figure 2-1. To connect
the wiring, loosen the terminal screw, insert the stripped wire into the
terminal, and tighten the screw securely.

Installation

5. Route the wires inside the cover to prevent pinching. Fasten the AC

cover (shown below) in kit provided, to the unit using the screw
provided. See Figure 2-1.

M370430-01 Rev F 2-7

Wire Size
(AWG)

Maximum Current
(Amps)

Wire Size
(AWG)

Maximum Current
(Amps)

20

2.5 6 61

18 4 4

97

16 6 2

155

14

10 1 192

12

16

1/0

247

10

21

2/0

303 8 36

Installation

Step 4: Selecting Load Wires

This section provides recommendations for selecting minimum load
wire sizes.

Load Wiring

To select the wiring for connecting the load to the power supply,
consider the following factors:

 Insulation rating of the wire. Current carrying capacity of the wire.
 Maximum load wiring length for operation with remote sense lines.

 Electrical noise and impedance effects of the load lines.

Insulation Rating

Use load wiring with a minimum insulation rating equivalent to the
maximum output voltage of the power supply.

Current Carrying Capacity

The load wiring must have a current carrying capacity greater than the
output rating of the power supply to ensure that the load wiring will not
be damaged if the load is shorted. Table 2-3 shows the maximum
current rating for various gauges of wire rated for 105 °C operation,
based on a maximum current density of 450 A/cm2.

Operating at the maximum current rating shown in Table 2-3 results in
an approximately 30 °C temperature rise for an appropriately-sized load
wire operating in free air. Where load wiring must operate in areas with
elevated ambient temperatures or bundles with other wiring, use larger
gauges or wiring rated for higher temperatures.

Table 2-3 Current Carrying Capacity for Load Wiring

2-8 M370430-01 Rev F

2

WIRE LENGTH (FEET)

WIRE GAUGE (AWG)

LOAD CURRENT (AMPS)

Installation

Maximum Load Wiring Length For Operation With Sense Lines

Figure 2-2 Maximum Load Wire Length for 1 V Line Drop

Noise and Impedance Effects

To minimize noise pickup or radiation, use shielded twisted pair wiring
of the shortest possible length for load sense wires. Connect the shield to
the power supply chassis. Where shielding is impossible or impractical,
simply twisting the wires together will offer some noise immunity.

M370430-01 Rev F 2-9

Installation

Step 5: Performing Functional Tests

The functional test procedures include:

 Power-on and front panel functional checks
 Voltage mode operation and current mode operation checks.

For information on local operation, see “Local Operation” on page 3-1
for adjusting front panel controls and settings.

Powering the Power Supply On/Off

To power on the power supply:

1. Ensure that the front panel power switch is in the Off position.

2. Ensure that the AC line voltage is within operating range.

3. Connect the line cord to a grounded AC outlet.

4. Turn the front panel power switch to the On position.

After a short power-on delay, illuminates on the
output voltage and current displays, followed by .

After approximately 1 second, the display returns to normal status.

To power off the power supply:

 Turn the front panel power switch to the Off position.

will blink on the display. The ALARM LED illuminates.

After a short delay, all lights on the display will not be illuminated.

2-10 M370430-01 Rev F

2

Voltage and Current Mode Operation Checks

To perform the voltage and current mode operation checks:

1. Ensure that the front panel power switch is in the On position

and the output is disconnected.

2. If the OUTPUT ENABLE Main button is illuminated, press

the button to turn off the output.

3. To check voltage mode operation, turn the 9-position mode

control to the VOLTS position.
The voltage set point will blink dimming and then return to full

brightness. For more information, see “Local Operation” on page
3-1.

4. Adjust the voltage to 5 V.

5. To check current mode operation, turn the 9-position mode

control to AMPS position.

Installation

Verify that the current set point is blinking in the output current
display.

6. Adjust the current to 1 A.

7. Press the OUTPUT ENABLE Main button to turn On.

8. Turn the front panel power switch to the Off position.

9. Turn the front panel power switch to the On position.

10. Connect a short circuit across the output terminals. Use leads

of sufficient current carrying capacity. (See “Step 4: Selecting
Load Wires”.)

11. Press the OUTPUT ENABLE Main button to enable the

output. The button will be illuminated when the output is
enabled.

CC Mode LED illuminates and the voltage and current are
displayed. CC Mode LED illuminates and the preset load current is
displayed.

12. Turn the front panel power switch to the Off position.

M370430-01 Rev F 2-11

WARNING: Shock hazard

There is a shock hazard at the power supply output when operating at an output
greater than 40 V. To protect personnel against accidental contact with
hazardous voltages, ensure that the load and its connections have no accessible
live parts.

CAUTION: Cable damage

When making connections to the output terminals, ensure terminals of opposite
polarity do not touch. Load cables and sense wires should be provided with
strain relief.

WARNING: Shock hazard

Disconnect the AC input before making any connections. A shock hazard may
be present at the output terminals. Allow 15 seconds after the AC power has
been removed before making any connections.

Installation

Step 6: Connecting Loads

This section describes how to connect loads to the power supply for
both single and multiple loads.

DC Output Connectors

6 V-40 V Models

The 6 V-40 V models are equipped with output terminals, as shown in
Figure 1-3 and Figure 1-6.

60 V-150 V Models

The 60 V-150 V models are equipped with output connectors, as shown
in Figure 1-4. These models have output currents that may require users
to use wire diameters that would not fit into a single output connector,
so there are two output connectors in parallel to increase the potential
current carrying capacity of load wiring.

300 V-600 V Models

The 300 V-600 V models are equipped with output connectors, as
shown in Figure 1-5.

2-12 M370430-01 Rev F

2

CAUTION

The XG power supply requires freewheeling and blocking diodes across
the output while driving inductive loads or batteries to protect the power
supply from damage caused by power being fed back into the supply and
from high voltage transients.

Selecting
Diodes

The diode must have a voltage rating at least 20% greater than the power
supply's output voltage and have a current rating greater than or equal to the
power supply's output rating. Connect the cathode to the positive output and the
anode to the return.

Where positive load transients such as back EMF from a motor may occur,
connect a Transient Voltage Suppressor (TVS) or a varistor across the output to
protect the power supply. The breakdown voltage rating for the TVS or varistor
must be approximately 10% higher than the rated supply output.

Inductive Loads and Batteries

Installation

M370430-01 Rev F 2-13

Figure 2-3 Diode Placement

For a detailed Application Note, please go to:

www.programmablepower.com and click SUPPORT.

Terminal

Power Supply

Terminal

Load

– Local Sense

+ Output

+ Local Sense

– Output

Installation

Connecting Single Loads

Figure 2-3 shows the recommended load connections for a single
load which is sensing its voltage locally. Local sense lines shown
are the default connections at the rear panel APG J1 connector (see
Figure 4-1 on page 4-5). The load lines should use the largest
gauge and shortest length of wire possible to ensure optimal
performance.

You do not need remote sensing for basic operation of your power
supply. However, if you wish to correct any small drops in your
load lines, then use the remote sensing feature. See “Step 7:
Connecting Remote Sensing” on page 2-15 for more information.

Figure 2-4 Connecting Single Loads

Connecting Multiple Loads

The proper connection of distributed loads is an important aspect of
power supply use. The common method of connection is a radial load
connection. Power is connected to each load individually from a single
pair of terminals designated as the positive and negative distribution
terminals. This pair of terminals may be the power supply output
terminals, the load terminals, or a distinct set of terminals especially
established for distribution use. In this scheme, there are no ground
loops and the effect of one load upon another is minimized.

2-14 M370430-01 Rev F

2

WARNING: Shock hazard

There is a potential shock hazard at the sense connectors when using a power
supply at an output greater than 40 V. Select wiring with a minimum insulation
rating equivalent to the maximum output voltage of the power supply for use as
local sense jumpers or for remote sense wires. Ensure that connections at the
load end are shielded to prevent contact with hazardous voltages.

Output +

Load

Pin J1.1 on APG
connector

Output terminals on
power supply

Output –

Chassis ground stud
+SNS

-SNS

Pin J1.6 on APG
connector

Step 7: Connecting Remote Sensing

Remote sensing permits you to shift the regulation point of the
power supply from the output terminals to the load or other
distribution terminals.

Use shielded twisted pair wiring of 20 to 26 AWG for best noise
performance. Make sure that the shielded twisted pair wiring insulation
is rated higher than the maximum output voltage of the power supply. If
possible, one end of the shield of the sense lines should be attached to
the chassis ground of the power supply.

Installation

Figure 2-5 Remote Sense Connection

To connect the remote sense wires:

1. Ensure that the front panel power switch is in the Off position.

2. Using a small flat blade screwdriver, remove the two sense

jumpers from pins J1.1 and J1.2, and from pins J1.5 and J1.6
on the APG Connector. See Figure 4-1 “APG Connector
Terminals” on page 4-5.

M370430-01 Rev F 2-15

CAUTION: Equipment damage

Do not operate the power supply with sense lines connected to the load without
also connecting the load power leads to the output terminals.

CAUTION: Reverse polarity

Avoid reversing positive (+) and negative (-) sense connections. When using
remote sense to compensate for load line losses, ensure that the positive sense
line is connected to the positive load terminal and the negative sense line is
connected to the negative load terminal. Do not reverse these connections or the
power supply may be damaged.

Important: Long load leads with large capacitance at the load and remote
sensing can cause voltage instability due to inductance of the load leads.
Measures to reduce inductance and/or capacitance (raising resonant frequency)
or using local sense can be beneficial in stabilizing the system.

Installation

3. Connect one end of the shield of the twisted pair wire to the

chassis ground point on the power supply.

4. Connect the positive sense line (+SNS) from the positive

regulation point as close as possible to the load terminals to
pin J1. 1.

5. Connect the negative sense line (-SNS) from the return of the

load to pin J1-6.
To compensate for losses in power leads connected to the output,

the power supply provides sense connections beside the output
terminals. With remote sense leads in place, the power supply
regulates to the displayed voltage at the point where the sense lines
are connected to the output leads. With the sense lines disconnected,
the power supply regulates the voltage at the output terminals.

2-16 M370430-01 Rev F

3

Local Operation

Chapter 3, Local Operation, provides the procedures for
local (front panel) operation such as:

 Configuring settings.
 Operating in constant voltage mode, constant current

mode, and constant power mode (available in version

2.21 and higher).

 Using the protection features.
 Using multiple power supplies.

Local Operation

Introduction

Once you have installed the power supply and connected both the AC
input power and the load (covered in “Installation” on page 2-1), the
power supply is ready for local operation. To turn the power supply on,
see “Powering the Power Supply On/Off” on page 2-10.

Configuring Settings from the Front Panel

Using the 9-Position Mode Control

The 9-position mode control is used with the rotary Adjust/Enter control
to configure settings in local operation. See Figure 1-2, “Front Panel
Display and Controls” on page 1-6 for location of the front panel
features.

Using the 9-position mode control, select one of nine modes: VOLTS,
AMPS, FLD, PRT, SAV, RCL, CAP, and VAP. See Figure 3-1 and
Table 3-1 for detailed information on the nine modes.

Figure 3-1 9-Position Mode Control

Using the Rotary Adjust/Enter Control

The rotary Adjust/Enter control is used to change settings and set the
value selected. The front panel displays information on the output
voltage and output current displays. Each display has a maximum of
four characters that are made up of 7 segments.

3-2 M370430-01 Rev F

3

The coarse and fine adjustment modes are used for setting the voltage
and current set points, OVP and UVP settings.

Coarse adjustment
mode

When using local operation to set the current and voltage set points, use
the coarse adjustment mode (default) followed by the fine adjustment
mode (see next). The coarse adjustment mode quickly adjusts the
settings in large increments to reach the desired value.

Fine adjustment
mode

Pressing the rotary Adjust/Enter control to change the mode to fine
adjustment mode, provides the ability to manipulate the last significant
digit. Once the exact desired value for the setting has been selected, press
the rotary Adjust/Enter control to commit the value to the unit.

9 Positions on the Mode
Control Knob

Turning the rotary Adjust/Enter
control lets you...

Pressing the rotary Adjust/
Enter control lets you...

VOLTS (Voltage
Programming)

Select the voltage set point in coarse
or fine adjustment modes. See
“Automatic Mode Crossover” on
page 3-12.

Set the value selected and cycle
to the next setting.

AMPS (Current Programming)

Select the current set point in coarse
or fine adjustment modes. See
“Constant Current (CC) Mode
Operation” on page 3-12.

Set the value selected and cycle
to the next setting.

FLD (Foldback)

Select Foldback option: CC, CV or
none. See “Setting Foldback Mode”
on page 3-25.

Set the value selected and cycle
to the next setting.

PRT (Protection)

Select the OVP set point (see page
3-28). Select the UVP set point (see
page 3-29.) Select OTP temperature
and Shutdown (see page 3-31.)

Set the value selected and cycle
to the next setting.

SAV (Save User Preset)

Select the user setting memory
location. See “Saving User Setting
Memory Locations” on page 3-40.

Save user setting memory
values.

RCL (Recall User Preset)

Select the user setting memory
location. See “Recalling User Setting
Memory Locations” on page 3-40.

Load user setting memory
values into the power supply.

CAP (Current Analog
Programming)

Select the programming source and
select the range.

Set the value selected and cycle
to the next setting.

VAP (Voltage Analog
Programming)

Select the programming source and
select the range.

Set the value selected and cycle
to the next setting.

PGM (Programming Options)

Select the remote interface to be used
for control, local lockout or current
sharing.

Select interface/Option and
cycle to the next setting.

Coarse and Fine Adjustment Modes

Table 3-1 Select and Set from the Front Panel

Local Operation

M370430-01 Rev F 3-3

Local Operation

Navigating the Menu System

The menu system of the XG follows a select and set model with the
exception of the VOLTS and AMPS modes. See “Setting VOLTS and
AMPS Modes next.

The general procedure for setting up the features in the select and
set model is:

1. To select a mode, rotate the 9-position Mode control to the

desired mode or press the rotary Adjust/Enter control once to
activate the current selection on the mode control knob. See
Figure 3-3.

2. To select the feature or setting, rotate the rotary Adjust/Enter

control to scroll through the different available settings of that
mode.

The settings appear on the output current display.

3. Press the rotary Adjust/Enter control to select the feature or

setting.

4. Set each value using the rotary Adjust/Enter control. When

the value has been selected, press the rotary Adjust/Enter
control to commit the updated value. Additional values may
become available, depending on the setting that is being
configured.

Setting VOLTS and AMPS Modes

The only exceptions to the select and set model are the VOLTS and
AMPS modes which do not allow the selection of tracking and select
and set mode by turning the rotary Adjust/Enter control. In VOLTS and
AMPS modes, the default entry mode setting is automatically selected
as either voltage or current tracking, respectively.

Voltage and current values can be set in tracking mode or select and set
mode using the rotary Adjust/Enter control:

 Tracking mode—the new values take effect as the rotary

Adjust/Enter control is rotated.

 Select and set mode—the new values do not take effect until the

rotary Adjust/Enter control is pressed. See “Normal Display Mode
and Inactivity Timeout” on page 3-6.

3-4 M370430-01 Rev F

3

Local Operation

To access the tracking mode for entering voltage and current:

1. Select the VOLTS or AMPS position on the 9-position mode

control. If the set point is blinking, the unit is in coarse
tracking mode.

 When the VOLTS mode is selected, the voltage set point will

blink in the output voltage display.

 When the AMPS mode is selected, the current set point will

blink in the output current display.

2. Use the rotary Adjust/Enter control to adjust the set point.

Note that there is an activity time out (see Normal Display
Mode and Inactivity Timeout on page 3-6).

The adjustments you make to the set point affect the opposing
output value (voltage when in AMPS mode or current when in
VOLTS mode), which will update in the non-blinking display.

3. Press the rotary Adjust/Enter control to enter fine adjust

tracking mode.
The set point blinks faster when the unit is in fine adjust tracking

mode.

4. Use the rotary Adjust/Enter control to fine tune the set point.

5. Once the set point has been selected, press the rotary

Adjust/Enter control to exit tracking mode and return to
normal display mode.

To access the select and set entry mode for the voltage and current
set points:

1. Select VOLTS or AMPS position on the 9-position mode

control.

2. Press the rotary Adjust/Enter control three times in

succession to enter coarse Pre-Set Adjustment.

3. Press the rotary Adjust/Enter control one more time to enter

fine Pre-Set Adjustment.

4. Press the rotary Adjust/Enter control once again to set the

value.
The units can also timeout (adjustable) to exit the menu. Once

Pre-Set Mode is entered, CrPU or FnPU will appear in the voltage
display.

M370430-01 Rev F 3-5

Important: Each user memory setting location stores the timeout so that
beginning users and expert users are not required to use the same timeout

Local Operation

Normal Display Mode and Inactivity Timeout

Normal display mode appears on the output voltage and current displays
when the configuration changes from the front panel have been
completed or when the inactivity timeout occurs (default is 3 seconds).
Normal display mode shows the output voltage and current values.

If a timeout occurs before the changes made to the value have been set,
the changes will not be saved and you will have to re-enter the changes.
The inactivity timeout is variable from 1 to 20 seconds and can only be
changed using the SCPI command.

The SCPI command (s) for these instructions are:

[:]SYSTem[<channel>]:FPANel[:TIMeout]

3-6 M370430-01 Rev F

3

RE 485

RE CHAN

LOCL LOC

CURR SHAR

RE 485L

CSAR CONT/SLA

LOCON/OFF

ADDR (1-31)

RE 485

None

CP CP(W)

SLP

LOOP

ON/OFF
ON/OFF

LEGEND:

Local Operation

Figure 3-2 Front Panel Menu System

M370430-01 Rev F 3-7

Display Text

Text Description

Negative Polarity

RS 232

RS 485

485L

RS 485L

All segments On, Power Up

Positive Polarity

Alternating Current

RS 485 Address

Analog Programming

Power On Autostart

Auxiliary Autostart

Current Analog Programming

Clear

Constant Current

Controller

1

Constant Power

Constant Voltage

Coarse Current Pre-set Mode

Coarse Voltage Pre-set Mode

Current Share (same as CUrrShAr)

Current

Current Share (same as CShr)

Fold Delay

Done

Error (debug)

Foldback

Fail

Fan

Flash

Fine Current Preset Mode

Fine Voltage Preset Mode

Foldback

Data rate (kbps)

GPIB Interface

1

version 2.21 and higher

Local Operation

Display Messages on the Front Panel

The front panel displays on the power supply will use text as shown in
Table 3-2 to indicate the status or mode.

Table 3-2 Front Panel Display Text

3-8 M370430-01 Rev F

3

Display Text

Text Description

Interlock

ENET Interface

Current APG Level

Voltage APG Level

Lock

Local



Loop Protection

Off

On Output Protection

Over Current Protection

Over Temperature Protection

Over Voltage Protection

Over Voltage Protection fine adjustment

OVP Calibration

Polarity

Protection mode

Power Supply Unit

Isolated Resistive Analog Programming

Recall Preset

Remote Programming/Interface

Non-Isolated Resistive Analog Programming

Controller (current share controller)

Share (current share)

Multichannel Remote Interface

Soft reset

Save Preset

Shutdown

Slave (current share slave)



Sleep Mode

Isolated Analog Voltage Programming

Non-Isolated Analog Voltage Programming

USB Interface

Under Voltage protection coarse adjustment

Under Voltage protection fine adjustment

Voltage Analog Programming

Voltage

Local Operation



M370430-01 Rev F 3-9

A blinking numeric value is either a voltage or current set point in
tracking mode. The display in which the set point appears, either

Local Operation

output voltage or output current displays, indicating the type of set
point: voltage or current.

Standard (Local) Operation

The power supply can be controlled by two methods, either from the
front panel or from any of the remote interfaces. Front panel control is
referred to as local operation (default setting) while control via any of
the remote interfaces is called remote operation. To set up the power
supply for remote operation, see Chapter 5, “Remote Operation”. Once
the remote connection has been established, the power supply can
switch seamlessly between local operation and any digital interface
(RS-232, RS-485, GPIB, USB and Ethernet).

Local lockout (page 3-41) is a feature that allows the front panel to be
locked so that accidental button presses are ignored. This feature is often
used to lock out the front panel while a user is controlling the power
supply from a remote location.

The output of the power supply has three modes of operation: Constant
Voltage, Constant Current, and Constant Power (available in version

2.21 and higher). All three of the operating modes are available
regardless of which control method (local or remote) is used.

Operating Modes

The output mode in which the power supply operates at any given time
depends on the following factors:

 Output voltage set point V

Note: the M10 Option includes a preset function to automatically
reset the output voltage to zero Volts at both power on and output
enabled, unless deliberately programmed otherwise (see Output
Protection, 3-35).

 Output current set point I
 Impedance of the attached load R

The three output modes of operation are Constant Voltage (CV) mode
(see page 3-12), Constant Current (CC) mode (see page 3-12), and
Constant Power (CP) mode (version 2.21 and higher; see page 3-12).

S

SET

ET

L

3-10 M370430-01 Rev F

3

Output enabled

When the output is turned on, both the voltage and current rise as quickly
as possible to try and reach the set points (V

SET

and I

SET

) that were

configured prior to enabling the output. Initially the unit will operate in
CV mode, which is the default mode. As the voltage and current rise to
meet the requirements of the load, the set point that is reached first
(based on the RI, either V

SET

or I

SET

) will determine which mode the

power supply will remain in. The operating mode is indicated by either
the CC mode LED or the CV mode LED, one of which will illuminate on
the front panel.

Local Operation

M370430-01 Rev F 3-11

Output disabled

The mode of operation is not determined until the output is enabled. The
CV and CC mode LEDs will not indicate the mode while the output is
disabled.

Local Operation

Constant Voltage (CV) Mode Operation

If the output is enabled and the configured current set point is much
higher than the requirements for the attached load, then the voltage will
rise until it reaches the voltage set point. When the output voltage
reaches the voltage set point, it stops rising. The unit will continue to
operate in CV mode. The load current will still vary to meet any changes
in required load current draw resulting from a change in the attached
load.

Constant Current (CC) Mode Operation

If the output is enabled, the voltage and current start to rise. At this time
the unit is operating in CV mode (default operational mode). As the load
current drawn reaches the value of the output current setting, the unit
will switch to CC mode and not allow any additional current to be drawn
above the value of I

voltage will still vary to meet any changes in required output voltage
resulting from a change in the attached load.

SET

. The unit is now operating in CC mode. The

Constant Power (CP) Mode Operation (version 2.21 and higher)

If the output is enabled, the voltage and current start to rise. The unit
will continue to increase the current until one of thefollowing occurs:

 The programmable power set point has been reached.
 The voltage set point has been reached, in which case the unit will

regulate the voltage in order to maintain the voltage set point.

 The current set point has been reached, in which case the unit will

regulate the current in order to maintain the current set point.

3-12 M370430-01 Rev F

3

Load current (V)

Load current (A)

Iset

CV mode

Crossover point

CV mode

Vset

Load current
Load voltage

Load resistance (Ω

Automatic Mode Crossover

Mode crossover occurs when the unit makes the switch between
operating modes. Crossover can occur from CV to CC or vice versa,
depending on how the attached load resistance changes. Figure 3-3
shows the relationships between the variables.

For example, if the unit was initially operating in CV mode with the
output voltage at the voltage set point and the load current below the
I

and the attached load resistance began to decrease, the current

SET

would rise to meet this change in the load. The load current will increase
in proportion to the decrease in the load resistance until the load current
drawn reaches the current set point. At this point further decreases in
load resistance (increased load current requirements) will cause the unit
to cross over into CC mode where the output voltage will vary with
changing load resistance and the load current will remain at the I

value.
The reverse operating mode change can also occur if the load resistance

is increased to the point that the required load current drops below the
I

value. At that point the power supply would crossover to CV mode

SET

and the load current would be free to vary as the load resistance
changed.

Local Operation

SET

Figure 3-3 Operating Modes

M370430-01 Rev F 3-13

Important: If you can't get the set point to the desired level, you may need to
change the set points for OVP.

Important: The control circuits have been designed to allow you to set the
output voltage up to 105% over the model-rated maximum value. The power
supply will operate within these extended ranges, but full performance to
specification is not guaranteed.

Quick Tip Remote
operation uses these
SCPI commands. See
page 5-1.

The SCPI command (s) for these instructions are:

[[:]SOURce[<channel>]]:VOLTage[:LEVEl][:IMMediate]
[:AMPLitude]

Important: The maximum and minimum setting values of the output voltage
are limited by the Over Voltage Protection and Under Voltage Protection
settings.

Local Operation

To set the voltage set point (V

SET

):

1. Turn the 9-position mode control to the VOLTS position or

press the rotary Adjust/Enter control if the 9-position mode
control is already at the VOLTS position.

The voltage set point is blinking in the output voltage display. The
output current will be displayed in the output current display.

2. Set the desired voltage value using the rotary Adjust/Enter

control.

3. Press the rotary Adjust/Enter control to transition to Fine

Adjust mode.
The set point will blink faster to indicate fine adjust tracking mode.

4. Set the desired voltage value using the rotary Adjust/Enter

control.

5. Once the desired value has been set, press the rotary

Adjust/Enter control to commit the setting.

To set the current set point (I

SET

:

)

1. Turn the 9-position mode control to the AMPS position or

press the rotary Adjust/Enter control if the 9-position mode
control is already at the AMPS position.

The voltage set point is blinking in the output voltage display. The
output current will be displayed in the output current display.

2. Set the desired current value using the rotary Adjust/Enter

control.

3. Press the rotary Adjust/Enter control to transition to Fine

Adjust mode.
The set point blinks faster to indicate fine adjust tracking mode.

3-14 M370430-01 Rev F

3

Important: The control circuits have been designed so that output current can

be set up to 105% over the model-rated maximum values. The power supply
will operate within these extended ranges, but full performance to specification
is not guaranteed.

Local Operation

4. Set the desired current value using the rotary Adjust/Enter

control.

5. Once the desired value has been set, press the rotary

Adjust/Enter control to commit the setting.

The SCPI command (s) for these instructions are:

[[:]SOURce[<channel>]]:CURRent[:LEVEl][:IMMediate]

[:AMPLitude]

M370430-01 Rev F 3-15

Local Control Configuration

Additional References

Use the front panel controls to
adjust the output voltage and
current set point settings.

See Chapter 3, “Local Operation” for front

panel operation. See Chapter 4, “Analog

Programming (APG) and Isolated Analog

Programming (ISOL)” for analog

programming procedures.

The OVP set point is adjusted at
the front panel to 105% above
the maximum rated output
voltage.

See “Using Over Voltage Protection (OVP)”
on page 3-27 for the adjustment procedure.
Important: The main output will not turn on if the shutdown function is
activated. See “Using the External Shutdown Function” on page 3-32.

Quick Tip Remote
Operation uses these
commands. See page
5-1.

The SCPI command (s) for these instructions are:

[:]OUTPut[<channel>][:POWer][:STATe]

Local Operation

Shipped Configuration (Local Operation)

The power supply is configured for local operation at the factory. See
Table 3-3 for a summary of this configuration. For more information on
default settings, see Table 3-9 on page 3-42.

Table 3-3 Shipped Configuration

Enabling the Output

Enabling the output on will also turn off the ALARM LED if the
ALARM LED has been latched on due to an alarm triggering and
automatically clearing. See “Alarms and Errors” on page 3-20.

To enable the output power:

 Press the OUTPUT ENABLE Main button on the front panel or

enter the SCPI command.
The OUTPUT ENABLE Main button will illuminate.

To disable the output power:

 Press the OUTPUT ENABLE Main button when the OUTPUT

ENABLE Main button is illuminated.
The output will be disabled and the LEDs will not be illuminated.

3-16 M370430-01 Rev F

3

Important: The auxiliary output will not be enabled if the external

AUX_ON_OFF signal line is being used to disable the auxiliary outputs. See
“AUX Output and Isolated Analog Programming (ISOL) Connector” on page
4-20.

Enabling the Auxiliary Output

To enable on the auxiliary output:

 Press the OUTPUT ENABLE Aux button on the front panel.

The OUTPUT ENABLE Aux button will illuminate.

To disable the auxiliary output:

 Press the OUTPUT ENABLE Aux button on the front panel again.

The OUTPUT ENABLE Aux button will not be illuminated.

If the auxiliary output is activated, +5 V on J3.9 (+AUX1) and +15
V on J3.11 (AUX2) will be present with respect to Pin J3.2 or Pin

J3.6 (COM ISOLATED). (See also “AUX Output and Isolated

Analog Programming (ISOL) Connector” on page 4-20 for more

details.)

Local Operation

The SCPI command (s) for these instructions are:

[:]OUTPut[<channel>]:AUXiliary[:STATe]

Output Auto Start Mode (Auto Restart)

The Auto Start mode establishes the state of the output of the power
supply after recovery from a complete power cycle (all front panel
LEDs are not illuminated).

If Auto Start mode is set to On, the power supply output will return to its
previous value when the power supply is powered up again.

If Auto Start mode is set to Off, the power supply output will remain off
after the power supply is powered up again.

To change the Auto Start mode:

1. Press and hold the OUTPUT ENABLE Main button for 1

second. or is displayed.

2. Switch the Auto Start mode.

The SCPI command (s) for these instructions are:

[:]OUTPut[<channel>][:POWer][:STATe]:PowerON[:STATe]

M370430-01 Rev F 3-17

Local Operation

Auxiliary Auto Start Mode

The Auxiliary Auto Start mode determines the state of the auxiliary
output after a complete power cycle (all front panel LEDS are not
illuminated). With Auxiliary Auto Start mode turned to On, the
auxiliary output will be activated after the power supply is powered up
again.

To define the Auxiliary Auto Start mode:

1. Press and hold the OUTPUT ENABLE Aux button for 1

second. or is displayed.

2. To change to status to On or Off, press the OUTPUT

ENABLE Aux button.

The SCPI command (s) for these instructions are:

[:]OUTPut[<channel>]:AUXiliary:PowerON[:STATe]

Constant Power Mode (version 2.21 and higher)

In Constant Power Mode the power supply will continually adjust the
current levels to maintain a constant power set point. This mode is
intended primarily for loads with response time greater than
approximately 100ms. In order to provide additional protection for the
load, voltage and current limits may be set while in the constant power
mode. If the unit cannot regulate to the Constant Power setting due to
load conditions, it will regulate at either the voltage or the current limit
depending on the load demand.

Example, CP Mode:

Constant Power set 500W
Voltage limit 61V
Current limit 20A

To activate Constant Power mode and set the value:

3. Turn the 9-position mode control to the FLD position or press

the rotary Adjust/Enter control if the 9-position mode control
is already at the FLD position.

4. Turn the rotary Adjust/Enter control until “CP” is displayed.

5. Press the rotary Adjust/Enter control.

6. Turn the Adjust/Enter control to the desired set point.

7. Press the rotary Adjust/Enter control

8. Turn the Adjust/Enter control control for fine adjustment.

3-18 M370430-01 Rev F

3

Local Operation

9. Press the rotary Adjust/Enter control to commit the Constant

Power operation.

To disable Constant Power operation:

1. Turn the 9-position mode control to the FLD position or press

the rotary Adjust/Enter control if the 9-position mode control
is already at the FLD position.

2. “FLD” is displayed on the output voltage display and the

output current display shows the Constant Power mode “CP”.

3. Turn the rotary Adjust/Enter control until “NONE” is

displayed in the output current display.

4. Press the rotary Adjust/Enter control to commit the setting

once the desiredvalue has been set.

The SCPI command (s) for these instructions are:

[:]SOURce[<channel>]:POWer:MODe[:STATe]

[:]SOURce[<channel>]:POWer:LEVel

M370430-01 Rev F 3-19

Alarm

Precedence

Output
Latch

Maskable

Display

AC Fail

1 (Highest)

Yes

No

Over Temperature Protection (OTP)

2

Yes

No

OtP

Over Temperature Protection (OTP) Slave
(1700 Watt only

3

Yes

Yes

OtP

Fan 4 No

Yes

Fan Slave (1700 Watt only)

5

No

Yes



Interlock

6

No

No

In Loc

Over Voltage Protection (OVP)

7

Always

No Over Current Protection (OCP)

8

Always

No Foldback

9

Yes

Yes External Shutdown

10

No

Yes Under Voltage Protection (UVP)

11 (Lowest)

No

Yes

Current Loop Protection

12 (Lowest)

Loop Pro

Flash Checksum Failure1

N/A

N/A

N/A

Local Operation

Alarms and Errors

Several conditions can cause alarms in the XG. Some conditions are:

 From user configurable features.
 Controlled in hardware and will trigger regardless of

configuration.

All alarms, with the exception of the Fan alarm, will result in the output
of the power supply being disabled. The Fan alarm does not affect the
output.

When an alarm is triggered, the appropriate alarm message will begin
blinking on the display and the Alarm LED will be illuminated.It is
possible that more than one alarm will trigger at the same time. When
this occurs, the alarm with the highest precedence will blink on the
display. Table 3-4 lists the precedence of alarms. If the alarm is cleared
and the event which caused the alarm has not been corrected, then the
alarm may trigger again immediately. Fix the reason for the alarm
before you clear it.

Table 3-4 Alarm Order of Precedence

1. The Flash Checksum Failure alarms are an exception as they can only occur during boot up or
recalling a user setting slot. If a checksum error is detected when recalling a user slot, no mod­ification of settings will occur, and an error will be pushed to the SCPI error queue. If a checksum
occurs at boot-up, then this checksum error can be cleared by doing a soft reset or by power cycling
the unit.

3-20 M370430-01 Rev F

3

Important: When an alarm is cleared by using this method, only the current

highest precedence alarm is cleared. If another alarm has occurred, then this
alarm will now become the highest precedence alarm and will begin blinking on
the display.

Clearing Alarms

Clearing Triggered and Manual Alarms

To clear a triggered alarm, use one of the following methods:

 Turn the power supply Off and then On.
 Press and hold the rotary Adjust/Enter control for 3 seconds.

To clear a manual alarm:

1. Press and hold the rotary Adjust/Enter control for 3 seconds.

The message will be displayed on the front panel for a
few seconds.

2. Repeat the alarm clearing until you have cleared all alarms.

Local Operation

Clearing a Flash Failure Alarm

The Flash Failure alarm is the only exception for clearing alarms. If a
flash failure occurs at boot time, it can only be cleared by a soft reset key
combination press (see “Resetting the Power Supply” on page 3-42) or
by power cycling the unit. If a checksum error is detected when recalling
a user slot, no modification of settings will occur, and an error will be
pushed to the SCPI error queue. The alarm will clear after a duration per
the currently configured front panel timeout setting.

To clear a triggered alarm, use one of the following methods:

 Turn the power supply Off and then On.
 For failures that occur during a recall of user memory settings, wait

the duration of the currently configured front panel timeout.

 Press and hold the reset key combination (Flash Fail ONLY). See

“Resetting the Power Supply” on page 3-42.

The SCPI command (s) for these instructions are:

[:]OUTPut[<channel>]:PROTection:CLEar

M370430-01 Rev F 3-21

Local Operation

Clearing Automatic Alarms

Some alarms will clear automatically when the condition that caused the
alarm is no longer present. When an alarm automatically clears, the
output voltage and current displays will return to normal, but the
ALARM LED will remain illuminated to indicate that an alarm has
occurred. If an automatic alarm is triggered, the normal alarm clearing
procedure still applies.

To clear the ALARM LED after an automatic alarm has cleared,
use one of the following methods:

 Send the SCPI Clear Alarm command.
 Press the OUTPUT ENABLE Main button to reenable the output.

The ALARM LED will no longer be illuminated.

For example, if one of the fans in the XG was temporarily blocked,
causing a Fan alarm, then the blockage was cleared and the fans
restarted, the alarm would clear. The output voltage and current displays
would be in normal mode, but the ALARM LED would be illuminated.
See “Front Panel ALARM LED” on page 3-22 for information on other
events that affect the ALARM LED.

Alarms status is tracked in the SCPI status registers. For more details on
how and where the alarms are tracked, see “Standard SCPI Register
Structure” on page 5-38.

Front Panel ALARM LED

The Alarm LED will illuminate due to one or more of the following
events occurring:

 OTP has been tripped.
 A fan has stopped.
 OVP has tripped.
 OCP has tripped.
 UVP has tripped
 Interlock is open circuit.
 AC power falls out of range.
 Foldback has tripped.
 Persistent storage checksum is wrong (Flash Fail alarm).
 Internal malfunction of power supply.
 Any alarm has tripped and been cleared automatically.

3-22 M370430-01 Rev F

3

Alarm

Bit Position

Value

Over Temperature Protection (OTP)

2

2

Over Temperature Protection (OTP) Slave
(1700W only)

3

4
Fan 3 8

Foldback

8

256

External Shutdown

9

512

Under Voltage Protection (UVP)

10

1024

Alarm Masking

Local Operation

The alarm LED will remain illuminated until the alarm is manually
cleared (see “Clearing Triggered and Manual Alarms” on page 3-21) or
by turning the main output on if the alarm has automatically been
cleared.

It is possible to completely disable some alarms through the use of the
alarm mask. If an alarm is masked then this masking will prevent it from
registering in the SCPI conditions registers as well as not triggering the
alarm. The alarms that can be masked are identified in Table 3-4 on page
3-20. Setting the bit position (1) of an alarm will result in the alarm
being enabled. Clearing the bit position (0) of an alarm will result in the
alarm being masked/disabled.

For Example:
If you wanted to enable the OTP, Foldback and UVP alarms, you would
take the foldback value of 256 and the UVP value of 1024 to get a mask
of 1280. This is the value you would send with the SCPI command.

Control of the alarm mask is only available using the SCPI command.

The SCPI command (s) for these instructions are:

[:]SYSTem[<channel>]:PROTection:MASK

The mask command takes a single parameter made up of the sum of the
values for the alarms that are to be masked. See Table 3-5 for the alarm
values associated with each maskable alarm.

Table 3-5 Alarm Mask Bit Positions

The SCPI command (s) for these instructions are:

[:]SYSTem[<channel>]:PROTection:MASK

M370430-01 Rev F 3-23

Alarm

Bit
Position

Value

AC Fail

0

1

Over Temperature Protection (OTP)

1

2

Over Temperature Protection (OTP) Slave
(1700 Watt only)

3

4
Foldback

8

256

Local Operation

Alarm Output Latching

When an alarm is triggered, the output will be disabled with the
exception of the Fan alarm. When an alarm is cleared, the alarm output
latch determines if the output should be re-enabled to the state before the
alarm occurred or if the output should remain in the off state.

Where setting the bit position (1) of an alarm latch will result in output
latching to the off state when the alarm is cleared and if cleared (0)
output will be re-enabled to the state before the alarm triggered.

To define the values for the bit position you determine which alarms you
want to latch. Read the value for this bit position from Table 3-6 and
sum them together. The result is the alarm last mask, which you should
send with the SCPI command.

For Example:
If you wanted to enable latching for OTP and Foldback you would take
the OTP value of 2 and add it to the foldback value of 256 to get a mask
of 258. This is the value you would send with the SCPI command.

The output latches are accessible through the SCPI command.

The SCPI command (s) for these instructions are:

[:]SYSTem[<channel>]:PROTection:LATCh

The latch command take a single decimal parameter made up of the sum
of the values for the alarms to determine if they are to be latched in the
off state on clearing. See Table 3-6 for the values associated with each
latchable alarm.

Table 3-6 Alarm Latch Bit Positions

3-24 M370430-01 Rev F

3

Setting Foldback Mode

Foldback mode is used to disable the output when a transition is made
between the operating modes. The power supply will turn off/disable the
output and lock in foldback mode after a specified delay if the power
supply transitions into CV mode or into CC mode, depending on the
foldback mode settings. This feature is particularly useful for protecting
current or voltage sensitive loads. Foldback can be set to trigger a switch
when transitioning from CV to CC mode or from CC to CV mode.

To set the foldback protection and foldback delay time:

1. Turn the 9-position mode control to the FLD position or press

the rotary Adjust/Enter control if the 9-position mode control
is already at the FLD position.

2. Select the type of crossover that will cause foldback to trigger

by using the rotary Adjust/Enter control.
If the mode selected is CC or CV mode, the foldback delay timer

will start on a transition into the selected mode. If the mode
selected is none, foldback is not enabled.

Local Operation

3. Press the rotary Adjust/Enter control when the desired mode

has been selected.
The FLD LED will illuminate and will be displayed in the

output voltage display.

4. Adjust the desired delay time using the rotary Adjust/Enter

control.
The range can be set from 0.50 seconds to a maximum of 50

seconds. The step size is in increments of 0.05 seconds when
setting from 0.50 to 5 seconds and then in 1 second increments
from 5 seconds to 50 seconds.

5. Once the desired foldback delay time has been selected, press

the rotary Adjust/Enter control to commit the foldback delay
setting.

To disable foldback protection:

1. Turn the 9-position mode control to the FLD position or press

the rotary Adjust/Enter control if the control knob is already
at the FLD position.

2. is displayed on the output voltage display and the output

current display shows the current foldback trigger mode.

3. Turn the rotary Adjust/Enter control until is displayed

in the output current display.

M370430-01 Rev F 3-25

Important: If you set foldback while the output is enabled and the trigger you
select is the same as the current operating mode, the foldback timer will begin
counting immediately after the delay time has been set.

Local Operation

4. Press the rotary Adjust/Enter control to commit the setting

once the desired value has been set.

5. The green FLD LED will turn off and the display will return

to the normal display mode.

The SCPI command (s) for these instructions are:

[:]OUTPut[<channel>]:PROTection:FOLDback[:MODE]

[:]OUTPut[<channel>]:PROTection:FOLDback:LATCh

Resetting Activated Foldback Protection

To reset activated and latched foldback protection, press and hold the
rotary Adjust/Enter control for approximately 3 seconds.

The SCPI command (s) for these instructions are:

[:]OUTPut[<channel>]:PROTection:CLEar

3-26 M370430-01 Rev F

3

Using Over Voltage Protection (OVP)

The OVP circuit protects the load in the event of an analog
programming error, an incorrect voltage control adjustment, or a
power supply failure. The OVP circuit monitors the output voltage
at the output of the power supply and will disable the output
whenever a preset voltage set point is exceeded. You can set the
preset voltage trip point by using the 9-position mode control on
the front panel or via one of the remote programming interfaces.

To prevent accidental tripping of the OVP while setting up, the
firmware will prevent the OVP set point from being less than
105% of the voltage set point when in local set point control mode.
When the XG is in VAP mode for defining voltage set point the set
point limitation will be based on the VAP input signal level. The
user should note it is possible to trip OVP in this mode if the OVP
is configured when the analog programming source is off.

When the user attempts to configure an OVP setpoint that is less
than 105% of the voltage set point via the front panel the set point
will stop allowing the value to decrement. If the user attempts to
configure an OVP set point that is less than 105% of the voltage set
point via SCPI a -221, “settings conflict error” will be pushed onto
the error queue.

Local Operation

M370430-01 Rev F 3-27

Important: The OVP range is variable from V

SET

+5% to V

MAX

+25%.

Local Operation

Defining the OVP Set Point

To define the OVP set point:

1. Turn the power supply On.
Ensure the voltage is lower than the desired set point.

2. Set the output to the desired voltage.
OVP can be set without setting desired output voltage first.

3. Turn the 9-position mode control to the PRT position. PrO
OVP is displayed.

4. Press the rotary Adjust/Enter control.

5. Turn the rotary Adjust/Enter control to set the upper limit
protection. See “Coarse and Fine Adjustment Modes” on
page 3-3.

6. Once the desired value has been set, press the rotary

Adjust/Enter control to commit the setting.

The SCPI command (s) for these instructions are:

[[:]SOURce[<channel>]]:VOLTage:PROTection[:OVERvoltage]

[:LEVel]

If the output is between OVP

and -5%, an OVP warning message

set

is possible when in APG mode.

3-28 M370430-01 Rev F

3

Important: UVP will not be active for voltage set points that are less than 1%

of model voltage.

Important: The UVP range is variable from 0 volts to OVP

SET

-10%.

Using Under Voltage Protection (UVP)

The UVP prevents voltage settings below a set value. The UVP lets you
create a voltage window of operation when used in conjunction with the
OVP setting. The UVP range is variable from 0 V to OVP

The UVP is a protection that becomes active after the output is enabled
and a period of time has passed to allow the output to reach its set point
value before the UVP protection begins monitoring. As with OVP if the
voltage set point is determined by analog control (VAP) and the voltage
strays to within 5% of the UVP set point then UVP Safe will trigger to
warn the user that they are about to trigger the UVP alarm.

The period of time before the UVP monitoring is active after the output
is enabled is determined by the rise-time delay for the model as listed in
Table C-2, “Remote Operation Programming” on page C-8 on the row
called Up-prog Response Time, 0 - Vmax. Since the rise time is based
on a purely resistive load the user should be aware that UVP triggering
might be possible in capacitive or rectifier loads due to the rise time
being longer. In these cases it is recommended that the user mask the
UVP alarm until the rise time has elapsed and then unmask the alarm to
allow UVP protection to be enabled during operation.

Local Operation

-10%.

SET

Defining the UVP Set Point

To define the UVP set point:

1. Turn the power supply On.

2. Set the output to the desired voltage.

3. Turn the 9-position mode control to the PRT position.

is displayed.

4. Turn the rotary Adjust/Enter control until is

displayed.

5. Press the rotary Adjust/Enter control to select the UVP for

setting up.

6. Set up the lower limit protection using the rotary Adjust/Enter

control.

7. Once the desired value has been set, press the rotary

Adjust/Enter control to commit the setting.
See “Coarse and Fine Adjustment Modes” on page 3-3.

The SCPI command (s) for these instructions are:

[[:]SOURce[<channel>]]:VOLTage:PROTection:UNDer[:LEVel]

M370430-01 Rev F 3-29

Local Operation

Over Current Protection (OCP)

The OCP alarm is a firmware alarm that is only configurable using the
SCPI interface. The OCP triggers if the output current exceeds the OCP
set point. Because the OCP alarm is a firmware based alarm it has a
latency before detection of the condition can occur. The user should be
aware of this latency and take this into consideration when relying on
OCP to protect a sensitive load. The maximum period for detecting an
OCP condition is 300 ms.

OCP is fixed at 110% of rated current.

3-30 M370430-01 Rev F

3

Local Operation

Using Over Temperature Protection Lock (OTP)

The OTP lock protects the power supply in the event of an over
temperature alarm. This alarm could be caused by ventilation restriction
or overheating due to fan failure.

Two modes are available:

 Auto recovery (OTP OFF) where the power supply turns on again

after cooling down.

 Latch mode (OTP ON) where you will need to reset the unit by

turning the front panel power switch to Off and then On again.

If the OTP is activated, the main output will turn off and (over
temperature protection) will blink on the display. The OTP alarm is an
alarm that will auto recover when the temperature falls back into normal
bounds.

Defining the OTP Mode

To define the OTP lock:

1. Turn the 9-position mode control to the PRT position. PrO
OUP is displayed.

2. Turn the rotary Adjust/Enter control until is

displayed.

3. Press the rotary Adjust/Enter control to display

4. Turn the rotary Adjust/Enter control to change to On or Off.

5. Press the rotary Adjust/Enter control.

The SCPI command (s) for these instructions are:

[:]SYSTem[<channel(s)>]:PROTection:LATCh

Resetting in Latch Mode

To reset the power supply if the OTP alarm is tripped and the OTP mode
is set to On (latching enabled), press and hold the rotary Adjust/Enter
control for approximately 3 seconds.

The SCPI command (s) for these instructions are:

[:]OUTPut[<channel(s)>]:PROTection:CLEar

[:]SYSTem[<channel(s)>]:PROTection:LATCh

.

M370430-01 Rev F 3-31

Local Operation

Using the External Shutdown Function

Use the external shutdown function to enable or disable the output of the
power supply via a logic level signal. When the external shutdown is
triggered, the power supply will display SD POL on the output voltage
and current displays. The external shutdown is useful for making
adjustments to either the load or the power supply without shutting off
the power supply or for using the power supply as part of a larger test
system in which digital or analog control is required.

Activating the External Shutdown Function

To activate the external shutdown function, use the AUX output supply
provided on the Analog Programming Connector J3. This input has a
user selectable polarity with logic low input from 0.0V to 1.2V and
logic high from 4.0V to 15V. The control signal for this input must be
capable of sinking 10mA minimum. This input is also compatible with
the use of dry contacts, where a short is logic low and an open is logic
high. The input lines of the shutdown circuit are fully optically isolated.
See page C-8 for specifications.

Once the External Shutdown has been triggered, the display will blink
the .

Controlling the External Shutdown Function

The external shutdown circuit accepts a voltage or dry contact control
(high or low logic level) to enable or disable the power supply output.
Make connections for the signals at the AUX Output and Isolated
Analog Programming Connector on the rear panel. (See “AUX Output
and Isolated Analog Programming (ISOL) Connector” on page 4-20 for
more information.)

To activate the shutdown function:

Connect the control signal source to the Shutdown pin (J3.12) on the
Aux Output and Isolated Analog Programming Connector with the
control circuit ground connected to Isolated Ground pin (J3.6).

The External Shutdown pin is pulled high internally (normally high).
Therefore, if this feature is not used, the polarity should be set to 1 to
avoid false triggering. (See “Defining the Polarity of the External
Shutdown Signal” on page 3-33 for instructions.)

3-32 M370430-01 Rev F

3

Important: There is an internal pullup resistor inside the shutdown circuit so

the shutdown polarity should be set to 0 if it is not being used.

Important: While Loop Protection is enabled (ON), the external shutdown
function will be automatically set to low active. When Loop Protection is

disabled (OFF), the external shutdown function will be set to the user’s last

setting.

Local Operation

Defining the Polarity of the External Shutdown Signal

1. Turn the 9-position mode control to the PRT position or press
the rotary Adjust/Enter control if the control knob is already
at the PRT position.

is displayed on the output voltage display.

2. Turn the rotary Adjust/Enter control until is

displayed.

3. Press the rotary Adjust/Enter control to display

(shutdown on logic 0) or (shutdown on logic 1).

4. Press the rotary Adjust/Enter control to commit the desired

polarity setting.
For example: If you set the shutdown logic to 1 ( ) and apply a

logic high (greater than 4 Vdc) to pin J3.12 relative to pin J3.6 on
the ISOL connector, the power supply will shut down. Conversely,
if you set the shutdown logic to 0 ( ), the power supply will
only operate when you have a logic high (greater than 4 Vdc) to pin
J3.2 relative to pin J3.6.

The SCPI command (s) for these instructions are:

[:]OUTPut[<channel>]:POLarity

Loop Protection (version 2.21 and higher)

The Loop Protection feature can be used to enable or disable multiple
units in daisy chain configuration through the AUX Output and Isolated
Analog Programming Connector, J3. Up to four units (example, Units
#1 through #4) can be configured in Loop Protection; if one of the units
is experiencing a fault condition, other units in the same loop will
disable their output simultaneously. This is achieved by connecting Unit

#1’s MAIN_PS_GOOD to Unit #2’s SD (Shutdown Main O/P) and

continues until Unit #4’s MAIN_PS_GOOD is fed to Unit #1’s SD

(Shutdown Main O/P). Common applications include single master
controlling multiple slave units as a system On/Off. In addition, any
fault from either operating unit will cause the system to disable.

The Loop Protection can be enabled or disabled locally using the front
panel 9-position mode control, or remotely using a SCPI command.

M370430-01 Rev F 3-33

Local Operation

Setting up Loop Protection

To set up Loop Protection:

With the AC powered OFF, connect the first unit’s pin J13.13 to the

next unit’s J 13.12 on the AUX Output and Isolated Analog

Programming Connector. Do this for up to four units. An example of a
3-unit loop protection is illustrated as follows:

To enable or disable Loop Protection:

1. Turn the 9-position mode control to the PRT position. PRO
OVP is displayed.

2. Turn the rotary Adjust/Enter control until LOOP PRO is
displayed.

3. Press the rotary Adjust control to display LOOP ON or OFF.

4. Press the rotary Adjust control to change the setting to ON or
OFF.

5. Press the rotary Adjust control to accept the change.

The SCPI command (s) for these instructions are:

[:]OUTPut [<channel>]:PROTection:Loop[:STATe]

3-34 M370430-01 Rev F

3

Interlock Function

The Interlock function can be used to wire an external shutoff switch
that can be used to enable or disable the power supply output. When the
switch is closed, the power supply will operate normally. If the switch is
opened, the power supply will trigger the interlock alarm. The output
will be disabled, the display will blink , and the ALARM LED
will illuminate. This alarm will automatically clear when the switch
closes again, and the output will automatically be restored to its
pre-alarm state (either enabled or disabled). The interlock function can
only be enabled or disabled (defined) using a SCPI command (cannot be
masked or latched through the alarm protection mechanisms.). Common
applications include an emergency shutoff switch or a door switch.

Connect the switch between pins J3.14 and J3.15 on the AUX Output
and Isolated Analog Programming Connector.

Defining the Interlock Mode

Local Operation

The Interlock mode is controlled via SCPI commands. There is no front
panel access for enabling or disabling the Interlock functionality. See
“Interlock Enable/Disable” on page 5-69.

The SCPI command for setting the Interlock mode to On or Off is:

[:]SENSe[<channel>]:PROTection:INTerlock[:STATe]

Output Protection

The output voltage and the output current can be programmed (preset) to
automatically start at zero Volts and zero Amps upon power-up and
upon output enable. Also, each can be reprogrammed to disable the
autotmatic reset to zero.

Note: With the M10 Option, the power supply voltage output is
preset to 0 Volts.

Programming Voltage Output Preset

To Enable/Disable automatic reset to 0 Volts:

1. Turn the rotary Adjust/Enter control to PRT and press.

2. Turn again until is displayed.

3. Press to display .

M370430-01 Rev F 3-35

Local Operation

4. Turn to display or .

5. Press to commit the selected setting.

Important: This single front panel operation affects both power on and
output enable. However, when using SCPI, there is a separate command
for each.

The SCPI command to query or enable/disable the 0 Voltage
Output Preset at power-on is:

[:]SYSTem[<channel>]:PON:VOLTage {?|ON|OFF}

The SCPI command to query or enable/disable the 0 Voltage
Output Preset upon output enable is:

[:]SYSTem[<channel>] :PON:ENAble:VOLTage {? |ON|OFF}

Programming Current Output Preset

To Enable/Disable automatic reset to 0 Amps:

1. Turn the rotary Adjust/Enter control to PRT and press.

2. Turn again until is displayed.

3. Press to display .

4. Turn to display or .

5. Press to commit the selected setting.

Important: This single front panel operation affects both power on and
output enable. However, when using SCPI, there is a separate command
for each.

The SCPI command to query or enable/disable the 0 Current
Output Preset at power-on is:

[:]SYSTem[<channel>]:PON:CURRent {?|ON|OFF}

The SCPI command to query or enable/disable the 0 Current
Output Preset upon output enable is:

[:]SYSTem[<channel>] :PON:ENAble:CURRent {? |ON|OFF}

3-36 M370430-01 Rev F

3

Power On Status Signal

Power On Status signal indicates a fault condition in the power supply.
Power On Status signal is a TTL output signal at Pin J2.13 with
reference to COM ISOLATED (Pin J2.2 or Pin J2.6).

During normal operation, the Power On Status signal will be high. If the
output is disabled for any reason, the Power On Status signal will go
low.

The following conditions will set the Power On Status to a low level:

 AC fail
 Current Loop Protection
 Over Voltage Protection (OVP)
 Under Voltage Protection (UVP)
 Over Current Protection (OCP)
 Over Temperature Protection (OTP)

Local Operation

 Foldback Protection
 Interlock
 Output Off
 Shutdown activated (rear panel shutdown).
 Internal hardware malfunction Fan failure

Hardware Malfunction Alarms

The power supply will turn off the output. An error message will be
displayed in the event that:

 OVP trips
 Voltage deviation in CV mode reaches more than ±5% from the set

 Current deviation in CC mode reaches more than ±5% from the set

__________________________

1. These two forms of hardware malfunction are only monitored in the

corresponding APG mode.

level.

level.1

1

M370430-01 Rev F 3-37

Voltage Setpoint

Current Setpoint

Voltage Output Protection

Current Output Protection

Over Voltage Protection (OVP)

Under Voltage Protection (UVP)

Over Temperature Protection (OTP)

Autostart OUTPUT ENABLE Main

Autostart OUTPUT ENABLE Aux

Foldback Mode

Foldback Delay

Shutdown Logic

Voltage Analog Programming (VAP) Mode

Voltage Analog Programming (VAP) Level

Current Analog Programming (CAP) Mode

Current Analog Programming (CAP) Level

Remote Programming Interface

Local Lock

PSU (Power Supply) Address

Data Rate (BPS)

Alarm Latches

Front Panel Timeout

Constant Power Mode*

Constant Power Level*

Loop Protection Enable

Line Drop Mode Settings

* version 2.21 and higher

Local Operation

Current Configuration Memory Settings

The power supply will save the unit settings at the time of power down.
These settings will be loaded when the power is restored to the unit or
the power supply is powered up again. Table 3-7 lists the settings that
are saved and recalled on a power cycle event.

Table 3-7 Power Cycle Saved/Recalled Settings

3-38 M370430-01 Rev F

3

Voltage Setpoint

Current Setpoint

Voltage Output Protection

Current Output Protection

Over Voltage Protection (OVP)

Over Temperature Protection (OTP)

Autostart OUTPUT ENABLE Main

Autostart OUTPUT ENABLE Aux

Foldback Mode

Foldback Delay

Shutdown Logic

Voltage Analog Programming (VAP) Mode

Voltage Analog Programming (VAP) Level

Current Analog Programming (CAP) Mode

Current Analog Programming (CAP) Level

Current Sharing Mode

Alarm Latches

Front Panel Timeout

User Setting Memory Locations

There are three user setting memory locations available for storing
frequently used configurations. These user setting memory locations
help to facilitate multiple users of an XG power supply who have
different setups or when multiple loads are used that have different
requirements. Table 3-8 lists the values that are stored in each user
setting memory location.

Table 3-8 User Accessible Saved/Recalled Settings Voltage Setpoint

Local Operation

M370430-01 Rev F 3-39

Local Operation

Saving User Setting Memory Locations

To save user setting memory locations:

1. Turn the 9-position mode control to the SAV position.

is displayed on the output voltage display with a number

indicating a preset position which is displayed on the output current
display.

2. Turn the rotary Adjust/Enter control to select a preset position

from 1 to 3.

3. Press the rotary Adjust/Enter control.
done is displayed on the output voltage display.

4. The setting has now been saved to the selected user setting

memory location.

The SCPI command (s) for these instructions are:

*SAV <setting_location>

or

[:]SYSTem[<channel>]:SAVE <setting_location>

Recalling User Setting Memory Locations

This feature recalls settings that were previously saved.

To load user setting memory locations:

1. Turn the 9-position mode control to the RCL position.

is displayed on the output voltage display with a number

indicating a preset position on the output current display.

2. Turn the rotary Adjust/Enter control to select a preset position

from 1 to 3.

3. Press the rotary Adjust/Enter control.

is displayed on the output voltage display.

The settings in the selected user setting memory locations have
now been applied to the power supply.

The SCPI command (s) for these instructions are:

*RCL <setting_location>

or

[:]SYSTem[<channel>]:RECall <setting_location>

Three user setting memory locations are available and one user
setting memory location is saved automatically before AC power
shutdown. This user setting memory location will be loaded after
AC power is restored.

3-40 M370430-01 Rev F

3

Local Lockout

Local lockout is a feature that allows the front panel to be locked so that
accidental button presses are ignored. This feature is often used to
lockout the front panel when you are controlling the power supply from
a remote location. When in local lockout mode, the front panel will
display Loc whenever a button is pressed or a knob is turned.

Enabling Local Lockout

To enable local lockout:

1. Turn the 9-position mode control to the PGM position or

press the rotary Adjust/Enter control if the control knob is
already at the PGM position.

The display will show in the output voltage display and the
selected remote interface in the output current display.

2. Turn the rotary Adjust/Enter control until the display shows

3. Press the rotary Adjust/Enter control.

4. Turn the rotary Adjust/Enter control until the display shows

5. Press the rotary Adjust/Enter control. Local lockout has been

enabled.

Local Operation

.

.

The SCPI command (s) for these instructions are:

[:]SYSTem:REMote:STATe

Disabling Local Lockout

To disable local lockout:

1. Turn the 9-position mode control to the PGM position or

press the rotary Adjust/Enter control if the control knob is
already at the PGM position.

The display will show in the output voltage display and the
selected remote interface in the output current display.

2. Turn the rotary Adjust/Enter control until the display shows

.

3. Press the rotary Adjust/Enter control.

Local lockout will be disabled after power-cycling the power
supply.

The SCPI command (s) for these instructions are:

[:]SYSTem[<channel(s)>]:REMote:STATe

M370430-01 Rev F 3-41

The reset is used to clear the parameters to the factory default values.

Soft Reset

The soft reset is used to set the parameters (see Table 3-9) to the default
values, but it does not reset the calibration constants

Parameter

Setting

Address

1

Data rate (Kbps)

9.6

Communication mode

RS-232

Vout setting

0 V

Iout setting

0 A

Output

Off

AUX Out

Off

Trigger

Off

Ext. On/Off Polarity

Negative

Auto start mode

Off

AUX Auto start mode

Off

OVP

Maximum

UVP

0 V

Foldback trigger

None

Foldback delay

0.5 s

Current Share Mode

Controller

Local Operation

Resetting the Power Supply

To perform a soft reset:

1. Turn the power supply to Off then On.

When the unit is powering on, is displayed on the
output voltage and current displays.

2. Press the key combination of both OUTPUT ENABLE Main

button and OUTPUT ENABLE Aux button and hold
continuously for 3 seconds in order to execute.

If the flash fail alarm triggers, it is also possible to reset the power
supply. The front panel should display .

3. Once a reset has been triggered, the output voltage display

shows for 1 second.

The model number will be displayed for 1 second and then return
to normal mode.

After executing a reset, the power supply's settings are restored to the
default settings but retain the calibration data. Table 3-9 lists the default
settings.

Table 3-9 Power Supply Default Settings

3-42 M370430-01 Rev F

3

Parameter

Setting

Alarm Output Latches

263 (0 x 107, all latches enabled)

Alarms Mask

2047 (0 x 7FF, all enabled)

Interlock

Disabled

Voltage Analog Programming

Off

Voltage APG Scale

10 V

Current Analog Programming

Off

Current APG Scale

10 V

Voltage Output Protection

Off

(except M10 Option: always On)

Current Output Protection

Off

(except M10 Option: always On)

Local Operation

M370430-01 Rev F 3-43

WARNING: Shock hazard

There is a shock hazard at the load when using a power supply at an output of
greater than 40V or a combined output of greater than 40V. To protect personnel
against accidental contact with hazardous voltages created by a series
connection, ensure that the load, including connections, has no live parts which
are accessible. Also ensure that the insulation rating of the load wiring and
circuitry is greater than or equal to the maximum or combined output voltage of
the power supply.

CAUTION: Equipment damage

Do not connect power supplies from different manufacturers in parallel or in
series.

CAUTION: Equipment damage

The remote programming inputs are internally referenced to the power supply's
negative output. Do not connect remote programming ground lines to the power
supply's positive output.

Local Operation

Using Multiple Power Supplies

You can operate power supplies of the same model with the
outputs in series to obtain increased load voltage or with the
outputs in parallel to obtain increased current, also called current
sharing. Split supply operation gives you two positive outputs, or a
positive and a negative output. See Figure 3-5 on page 3-45. When
using multiple supplies in series or parallel, they will not meet the
single unit specifications in this Manual.

3-44 M370430-01 Rev F

3

Power Supply

Power Supply

Common

Load

Local Operation

Figure 3-4 Split Supply Operation

M370430-01 Rev F 3-45

CAUTION: Equipment damage

When two power supplies are connected in series, they should be programmed
to the same output voltage to prevent damage to the lower voltage supply at
short circuit condition.

CAUTION: Equipment damage

Use properly rated diodes to protect the power supply from damage while
driving inductive loads..

Local Operation

Configuring Multiple Supplies for Series Operation

A maximum of two power supplies of the same rating can be connected
in series to increase the output voltage.

Load Considerations

INDUCTIVE LOADS:
To prevent damage to the power supply from inductive kickback,

connect a diode (rated at greater than the supply’s output voltage and

current) across the output. Connect the cathode to the positive output
and the anode to return. Where positive load transients, such as back
EMF from a motor may occur, a second diode in series with the output is
recommended to protect the power supply.

BLOCKING and FREE WHEELING DIODES:
The Peak Reverse Voltage ratings should be a minimum of 2-3 times the

power supply maximum output voltage. The Continuous Forward
Current rating should be a minimum of 1.5 times the power supply
maximum output current. Heatsink may be required. There also may be
a need for higher voltage rated parts, dependent on load circuit design
and inductor values.

Connecting to the Load in Local Sensing Mode

Connect the negative (-) output terminal of one power supply to the
positive (+) output terminal of the next power supply. See Figure 3-5 for
a representation of series operation.

3-46 M370430-01 Rev F

3

Local Operation

Figure 3-5 Series Operation

M370430-01 Rev F 3-47

CAUTION: Equipment damage

Do not connect sense lines through relays.

Local Operation

Connecting to the Load in Remote Sensing Mode

Connect the negative (-) output terminal of one power supply to the
positive (+) output terminal of the next power supply. The more
positive supply's positive sense line should connect to the positive
terminal of the load (or distribution point). Its return sense line
should connect to the connection between the two units at the same
spot as the negative supply's positive sense line. The return sense
line of the negative supply should be connected to the return of the
load. See Figure 3-6.

Figure 3-6 Load Connections in Remote Sensing Mode

3-48 M370430-01 Rev F

3

Important: If current sharing is not being used, the unit must be configured as

a controller. Failure to do so will result in unpredictable operation.

Local Operation

Configuring Multiple Supplies for Current Sharing Operation
(APG Method)

Up to four power supplies can be connected in parallel to increase the
output current. One of the units will operate as the master unit and the
remaining units will operate as slave units controlled by the master unit.
The master unit uses the analog programming lines to set the output
voltages and currents of the slave units to match its output.

In remote digital operation, only the master unit can be programmed
remotely while the slave units that are connected remotely will only
provide voltage, current and status readback information.

In APG current sharing topologies, only the master unit can be
programmed using any of the input methods (front panel, remote digital,
or analog programming control). The slave unit(s) voltage and current
output(s) are determined by the master unit through the REF_I input to
each slave unit. The readback using any of the monitoring methods
(front panel display, user monitor lines or SCPI measure commands) of
each unit (master or slave) will provide individual unit status, not
system status.

Setting up the Controller Unit

Set the output voltage of the master unit to the desired voltage. Program
the current set point of the master unit to the desired load current set
point divided by the number of parallel units. During operation, the
master unit operates in Constant Voltage mode, regulating the load
voltage at the programmed output voltage. Send the Current share SCPI
command or use the following instructions to program front panel
current share setup:

1. With the 9-position mode control at the PGM position, press

the rotary Adjust/Enter control.

is displayed on the output voltage display.

2. Turn the rotary Adjust/Enter control to select and

press the Adjust/Enter control.

is displayed on the output voltage display.

3. Turn the rotary Adjust/Enter control to select in the

output current display.

M370430-01 Rev F 3-49

Important: The slave unit discussed here is not the same as the remote
interface slave described in chapter 5.

Local Operation

4. Press the rotary Adjust/Enter control to commit the setting.

The SCPI command (s) for these instructions are:

[[:]SOURce[<channel>]]:COMBine:CSHare[:MODE]

Setting up the Slave Units

The output voltage and current of the slave units should be programmed
to maximum value. During parallel operation, the slave units operate as
a controlled current source following the controller unit's output current.

All slave units must be configured with the SCPI command to enable
current sharing, or use the following instructions to program front panel
current share setup:

1. With the 9-position mode control at the PGM position, press

the rotary Adjust/Enter control.

2. Turn the Adjust/Enter conrol to select “ ” and press

the Adjust/Enter control.

is displayed on the output voltage display.

is displayed on the output voltage display.

3. Turn the rotary Adjust/Enter control to select in the

output current display.

4. Press the rotary Adjust/Enter control to commit the setting.

The SCPI command (s) for these instructions are:

[[:]SOURce[<channel>]]:COMBine:CSHare[:MODE]

Setting Over Voltage Protection (OVP)

The master unit's OVP should be programmed to the desired OVP level.
The OVP of the slave units should be programmed to a higher value
than the master OVP. When the controller unit shuts down, it will
program the outputs of the slave units to zero volts. If a slave unit shuts
down, only that unit would shut down and the remaining slave units
would supply all the load current if possible.

3-50 M370430-01 Rev F

3

MASTER PSU

To other slaves

SLAVE PSU

Shielded Twisted Pair

Out

Out

LOAD

Local Operation

Setting Foldback Protection

Foldback protection is only available on the master units as the
slaves operate in constant current mode. They should never
crossover into constant voltage mode. If foldback is triggered on
the master unit, when its output shuts down, it will program the
slave unit's output to zero volts.

Connecting to the Load in Local Sensing Mode (Parallel
Control Method)

Connect the power supplies in parallel to obtain a single output
supply with a higher output current set point. Set all of the outputs
to the same voltage before connecting the positive (+) and negative
(-) terminals in parallel. The total current available is the sum of
the maximum currents of each power supply.

Figure 3-7 Load Connections in Local Sensing Mode

M370430-01 Rev F 3-51

MASTER PSU

To other slaves

SLAVE PSU

Shielded Twisted Pair

Out

Out

LOAD

Local Operation

Connecting to the Load in Remote Sensing Mode (Parallel
Control Method)

Figure 3-8 Load Connections in Remote Sensing Mode (Parallel

Control Method)

3-52 M370430-01 Rev F

3

Local Operation

M370430-01 Rev F 3-53

Local Operation

3-54 M370430-01 Rev F