KEPCO JQE 150-1.5MVPY-26956 User Manual

INSTRUCTION MANUAL

JQE 150-1.5MVPY-26956

POWER SUPPLY

MODEL

KEPCO INC.

An ISO 9001 Company.

IMPORTANT NOTES:

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

MODEL SERIAL NO. REV. NO.

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

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

Data subject to change without notice.

JQE 150-1.5MVPY-26956

POWER SUPPLY

INSTRUCTION MANUAL

ORDER NO. REV. NO.

©2011, KEPCO, INC.
P/N 243-1278-e

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

KEPCO®

THE POWER SUPPLIER™

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

Declaration of Conformity

Application of Council directives:

Standard to which Conformity is declared:

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

control and laboratory use - Part 1)

Manufacturer's Name and Address:

Importer's Name and Address:

Type of Equipment:

Model No.:

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

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

P

O

C

E

V

I

T

A

T

N

E

S

E

R

P

E

R

Component Power Supply

[PRODUCT MODEL NUMBER]

Y

Year of Manufacture:

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

Place: KEPCO Inc.

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

Saul Kupferberg

(Full Name)

Date:

228-1348 DC-COMP/INST 081111 A

VP OF SALES

(position)

Conditions of Conformance

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

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

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

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

4. This power supply has secondary output circuits that are considered hazardous, and which exceed
180W output power at a potential of 2V or more.

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

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

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

B 22 8 -13 51 CO N D/C O NFO R M 08 1111

SAFETY INSTRUCTIONS

1. Installation, Operation and Service Precautions

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

!

!

!

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

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

This product is factory-wired for the nominal a-c mains voltage indicated on the rat­ing nameplate located adjacent to the source power connection on the product's rear
panel. To reconfigure the product input for other nominal mains voltages as listed
herein, the product must be modified by a trained service technician.

2. Grounding

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

The PROTECTIVE EARTHING CONDUCTOR TERMINAL must be properly con-

!

nected prior to application of source power to the product (see instructions on instal­lation herein) in order to ensure safety from electric shock.

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

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

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

3. Electric Shock Hazards

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

This symbol appears adjacent to any external terminals at which hazardous voltage

!

22 8 -1 3 52 SA FET Y - (C O V ER R E MO VA L) 0 8 1111 C/(D BLANK)

levels as high as 500V d-c may exist in the course of normal or single fault condi­tions.

This symbol appears adjacent to any external terminals at which hazardous voltage
levels in excess of 500V d-c may exist in the course of normal or single fault condi­tions.

TABLE OF CONTENTS

SECTION PAGE

SECTION 1 - INTRODUCTION

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

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

1.3 Features. ................................................................................................................................................. 1-1

1.4 Accessories ............................................................................................................................................. 1-2

1.5 Specifications, General ........................................................................................................................... 1-2

1.6 Specifications, Electrical.......................................................................................................................... 1-2

1.7 Specifications, Performance.................................................................................................................... 1-3

1.7.1 Voltage Control Channel.................................................................................................................... 1-3

1.7.2 Current Limit Control Channel ........................................................................................................... 1-4

1.7.3 Current Monitor.................................................................................................................................. 1-4

1.7.4 Dynamics ........................................................................................................................................... 1-5

1.7.5 General .............................................................................................................................................. 1-5

1.8 Specifications, Mechanical ...................................................................................................................... 1-5

SECTION 2 - INSTALLATION

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

2.2 Terminations............................................................................................................................................ 2-1

2.3 AC Input Requirements ........................................................................................................................... 2-4

2.4 Cooling .................................................................................................................................................... 2-4

2.5 Preliminary Operational Check................................................................................................................ 2-4

2.6 Installation ............................................................................................................................................... 2-5

2.7 Grounding................................................................................................................................................ 2-5

SECTION 3 - OPERATION

3.1 Standard Power Supply Operation, Local Control................................................................................... 3-1

3.1.1 General .............................................................................................................................................. 3-1

3.2 Load Connection ..................................................................................................................................... 3-1

3.2.1 Local Error Sensing ........................................................................................................................... 3-1

3.2.2 Remote Error Sensing ....................................................................................................................... 3-1

3.2.3 Grounded Load Connection............................................................................................................... 3-2

3.3 Output Adjustment................................................................................................................................... 3-3

3.4 Introduction to Remote Programming ..................................................................................................... 3-3

3.4.1 General .............................................................................................................................................. 3-3

3.4.2 Equations Showing the Operation of the Kepco Bridge..................................................................... 3-5

3.5 General Rules for Remote Programming ................................................................................................ 3-6

3.5.1 Grounding .......................................................................................................................................... 3-6

3.5.2 Connections....................................................................................................................................... 3-6

3.5.3 Programming Resistors ..................................................................................................................... 3-6

3.5.4 External Switching ............................................................................................................................. 3-6

3.6 Output Voltage Programming With External Resistance......................................................................... 3-6

3.7 Constant Current Operation .................................................................................................................... 3-7

3.8 Output Current Programming with External Resistance.......................................................................... 3-8

SECTION 4 - CALIBRATION

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

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

4.3 Lag Network Adjustment ......................................................................................................................... 4-1

4.4 Overvoltage Protection (OVP) Test and Adjustment ............................................................................... 4-1

4.5 Output Voltage Calibration ...................................................................................................................... 4-2

4.5.1 Voltage Pre-calibration Setup ............................................................................................................ 4-2

4.5.2 Zero Output Voltage Calibration ........................................................................................................ 4-2

4.5.2.1 Zero Output Voltage (Local Programming) Calibration................................................................ 4-3

4.5.2.2 Zero Output Voltage (Remote Programming) Calibration............................................................ 4-3

4.5.3 Zero Current Monitor Calibration ....................................................................................................... 4-3

4.5.4 Local Full Scale (FS) Output Voltage Calibration .............................................................................. 4-3

JQ E SPE C IAL S VC 0 8 1111 i

TABLE OF CONTENTS

SECTION PAGE

4.5.5 Remote Full Scale (FS) Output Voltage Calibration ......................................................................... 4-4

4.6 Output Current Limit calibration.............................................................................................................. 4-4

4.6.1 Current Limit Pre-calibration Setup................................................................................................... 4-4

4.6.2 Zero (Minimum) Output Current Limit "B" Calibration ....................................................................... 4-5

4.6.3 Full Scale (maximum) Output Current Limit "B" Calibration.............................................................. 4-5

4.6.4 FS Current Monitor Calibration ......................................................................................................... 4-5

4.6.5 Full Scale Output Current Limit "A" Calibration................................................................................. 4-5

SECTION 5 - THEORY OF OPERATION

5.1 Simplified Diagram Discussion ............................................................................................................... 5-1

5.2 Circuit Description................................................................................................................................... 5-1

5.2.1 A-C Input Circuit................................................................................................................................ 5-1

5.2.2 Main d-c Supply ................................................................................................................................ 5-3

5.2.3 Pass-Element Section....................................................................................................................... 5-3

5.2.4 Voltage Error Amplifier (VEA) ........................................................................................................... 5-3

5.2.5 Current Limit Circuit .......................................................................................................................... 5-3

5.2.6 Overvoltage Protection Circuit and Current Monitor ......................................................................... 5-4

5.2.7 Auxiliary Supplies.............................................................................................................................. 5-4

5.2.8 Metering Circuit................................................................................................................................. 5-5

SECTION 6 - MAINTENANCE

6.1 General ................................................................................................................................................... 6-1

6.2 Disassembly/Reassembly....................................................................................................................... 6-1

6.2.1 Cover Removal ................................................................................................................................. 6-1

6.2.2 A1 Circuit Board Removal................................................................................................................. 6-1

6.2.3 A5 Terminal Block Circuit Board Removal ........................................................................................ 6-2

6.2.4 A3 Heat Sink Removal...................................................................................................................... 6-2

6.2.5 A4 Overvoltage Protection Circuit Board Removal ........................................................................... 6-2

6.2.6 Reassembly. ..................................................................................................................................... 6-2

6.3 Troubleshooting ...................................................................................................................................... 6-2

6.4 Power Supply Measurements................................................................................................................. 6-4

6.4.1 Required Test Equipment. ................................................................................................................ 6-4

6.4.2 Measurement Instructions................................................................................................................. 6-5

SECTION 7 - ELECTRICAL PARTS LIST AND DIAGRAMS

7.1 General ................................................................................................................................................... 7-1

7.2 Ordering Information............................................................................................................................... 7-1

7.3 Abbreviations Used in Kepco Parts Lists................................................................................................ 7-2

7.3.1 Reference Designators ..................................................................................................................... 7-2

7.3.2 Descriptive Abbreviations ................................................................................................................. 7-2

ii JQ E SPE C IAL S VC 0 8 1111

LIST OF FIGURES

FIGURE TITLE PAGE

1-1 Mechanical Outline Drawing ....................................................................................................................... 1-6

2-1 Front Panel Controls and Indicators, JQE Special Models ......................................................................... 2-1

2-2 Rear Panel Terminations, JQE Special Models .......................................................................................... 2-2

2-3 Location of Internal Adjustments ................................................................................................................ 2-3

2-4 Conversion to 230V AC Line Operation ...................................................................................................... 2-4

3-1 Load Connection Showing a Floating Load ................................................................................................ 3-1

3-2 Grounded Load Connections ...................................................................................................................... 3-2

3-3 Comparison Bridge (Simplified) for Voltage Mode ...................................................................................... 3-4

3-4 Comparison Bridge (Simplified) for Current Mode ...................................................................................... 3-4

3-5 Remote Resistance Programming (Voltage Mode)..................................................................................... 3-7

3-6 Remote Resistance Programming (Current Mode)..................................................................................... 3-8

5-1 JQE Special Power Supply, Simplified Schematic Diagram ....................................................................... 5-2

6-1 A1 PC Board, Reassembly ......................................................................................................................... 6-1

7-1 JQE 150-1.5MVPY-26956 Power Supply, Component Locations .............................................................. 7-3

7-2 JQE 150-1.5MVPY-26956 A1 Assembly, Component Locations................................................................ 7-6

7-3 JQE 150-1.5MVPY-26956 A3 Assembly, Component Locations................................................................ 7-11

7-4 JQE 150-1.5MVPY-26956 A3A1 Assembly, Component Locations ........................................................... 7-12

7-5 JQE 150-1.5MVPY-26956 A3A2 Assembly, Component Locations ........................................................... 7-13

7-6 JQE 150-1.5-26956 A4 Assembly, Component Locations ......................................................................... 7-14

7-7 JQE 150-1.5MVPY-26956 A5 Assembly, Component Locations................................................................ 7-18

7-8 JQE 150-1.5MVPY-26956, Overall Schematic Diagram............................................................................. 7-21

7-9 A1, Amplifier and Reference Board A1, Schematic Diagram...................................................................... 7-23

7-10 Overvoltage Protection and Current Monitor Board A4, Schematic Diagram ............................................. 7-25

7-11 Output Terminals Board A5, Schematic Diagram ....................................................................................... 7-27

JQ E SPE C IAL S VC 0 8 1111

iii

LIST OF TABLES

TABLE TITLE PAGE

1-1 JQE Special Models, Electrical Specifications ........................................................................................... 1-2

1-2 JQE Special Models, Common Electrical Specifications ............................................................................ 1-3

1-3 Current Limit Values ................................................................................................................................... 1-4

2-1 Front Panel Controls and Indicator Functions ............................................................................................ 2-1

2-2 Rear Panel Termination Functions ............................................................................................................. 2-2

2-3 Internal Adjustments ................................................................................................................................... 2-3

6-1 Auxiliary Supply Voltages ........................................................................................................................... 6-3

iv JQ E SPE C IAL S VC 0 8 1111

SECTION 1 - INTRODUCTION

1.1 SCOPE OF MANUAL

This manual contains instructions for the installation, operation and maintenance of the specially
modified Kepco JQE 150-1.5MVPY-26956, "HALF-RACK" Power Supplies, manufactured by
Kepco, Inc., Flushing, New York, U.S.A. This model is one of a group of three specially modified
JQE power supplies (see Table 1-1) referred to, hereafter referred to as JQE Special Power Sup­plies or JQE Specials. Additional copies of this manual can be downloaded from the Kepco web
site at
http://www.kepcopower.com/support/opmanls.htm#jqe.

1.2 GENERAL DESCRIPTION

The Kepco JQE Special Power Supplies are general purpose, precision regulated voltage
sources in the “half-rack” configuration. JQE Power Supplies feature full range voltage control
and current limit adjustment by means of multi-turn front panel controls. JQE Special power sup­plies have linear, full-dissipation series-regulators (NPN) driven by an integrated circuit opera­tional amplifier. A sharp current-limit circuit enables current control operation of the power
supply. The output of the JQE power supply is programmable. All necessary connections are
available on terminals at the rear barrier-strips.

The compact design of the JQE Specials was made possible by a unique heatsink design of
exceptional efficiency in combination with highly reliable low-noise fans. All JQE power supplies
feature all-silicon design with conservatively rated components for added reliability.

JQE special power supplies are identical in their mechanical dimensions (Refer to FIG. 1-3) and
in their electrical specifications, except as noted in Table 1-1.

1.3 FEATURES.

The three JQE Specials include the following features:

a) Two panel meters which permit simultaneous monitoring of the output voltage and out-

put current.

b) Overvoltage Protection. This protection acts simlutaneously on the circuit breaker’s volt-

age coil and the electrical "crowbar" that shorts the output through a silicon-controlled
rectifier (SCR) if the output voltage exceeds a preadjustable limit (see paragraph 1.7.5a)
for specifications).

c) Zero and full scale voltage calibration for local front panel voltage control.

d) Zero and full scale current calibration for CURRENT LIMIT “B”

e) Full scale current calibration for CURRENT LIMIT “A”

f) Zero and full scale current calibration for CURRENT MONITOR

g) Full scale calibration for remote resistive voltage control

h) Overvoltage protection adjustment

i) Overvoltage protection delay adjustment

The main chassis frame of the power supply is constructed from cold-rolled steel, as is the per­forated wrap-around cover. Front panel material is aluminum (Refer to FIG. 1-3 for finish).

JQE 26956 081111 1-1

1.4 ACCESSORIES

a) RACK ADAPTOR (for two units); Kepco Model RA 24. Fits standard EIA rack-dimen-

sions.

b) FILLER PANEL, to cover empty slot if RA 24 is used for one unit only: Kepco Model RFP

24-2.

1.5 SPECIFICATIONS, GENERAL

a) AC INPUT: 105 to 125V AC or 210 to 250V AC (selectable, refer to PAR. 2.3 ) , 46 to 65

Hz, single phase (consult factory for operation on power line frequencies above 65 Hz.).
Refer to the table of model specifications (Table 1-1) for the AC input current for each
model.

b) OPERATING TEMPERATURE RANGE: –20°C to +71°C (without derating of the output).

c) STORAGE TEMPERATURE: –40°C to +85°C.

d) COOLING: High efficiency, single bearing fan, (permanently lubricated) with special low

noise non-metal blade.

e) ISOLATION: A maximum of 500 Volts (d-c or p-p) can be connected between chassis

and either output terminal.

1.6 SPECIFICATIONS, ELECTRICAL

Table 1-1 indicates specifications for parameters that vary for different JQE Special models.
Table 1-2 lists electrical specifications that apply to all JQE Special models.

TABLE 1-1. JQE SPECIAL MODELS, ELECTRICAL SPECIFICATIONS

DC OUTPUT

MODEL

NUMBER

JQE 15-12MVPY-26954 0 - 15 0 - 5 5 4.5

JQE 55-5MVPY-26955 0 - 55 0 - 5 5 2.7

JQE 150-1.5MVPY-

26956

RANGE

(VOLTS) (AMPS)

0 - 150 0 - 1.5 1.5 0.4

CURRENT LIMIT OUTPUT IMPEDANCE

“A”

(AMPS)

“B”

(AMPS)

a) VOLTAGE RECOVERY TIME: (for step load current), <50µsec.

b) OVERSHOOT: No output voltage overshoot from turn-on, turn-off, or power failure for

output settings above 25% of maximum rated output voltage. Below 25%, output voltage
overshoot is a function of load current and is negligible for loads in excess of 10% of the
maximum rated load current.

VO LTA GE M O DE

d-c OHMS + SERIES L

63

µΩ + 0.5µH5KΩ + 300µF

550

µΩ + 1µH 18KΩ + 850µF

Ω + 2µH 50KΩ + 440µF

63m

CURRENT MODE

d-c OHMS + SHUNT C

MAXIMUM

INPUT AMPS

@ 125V AC

2.0

5.0

4.6

1-2 JQE 26956 081111

TABLE 1-2. JQE SPECIAL MODELS, COMMON ELECTRICAL SPECIFICATIONS

∆I

<2nA

<5nA

<2nA

<5nA

(3)

O

OUTPUT EFFECTS

INFLUENCE QUANTITY

Source effect: 105-125/210-250V a-c <0.0005% <0.005%

Load effect: no load - full load

for voltage mode: full load
for current limit mode: short-circuit

Time effect: 8 hours (drift) <0.01% or 1mV < 0.1%

Temperature effect: per °C <0.01% <0.1%

Ripple and Noise

(1) Whichever is greater.
(2) Current Mode Output Effects (

quality, wirewound unit, with a wattage at least 10 times the actual power dissipated, have a Temperature Coeffi­cient of 20 parts per million or better, include adequate cooling, and drop a sample voltage of 1.0 Volt at the mea­suring current. A resistor built as a 4-terminal network is recommended. Current feedback is exercised with an
internal 20 PPM feedback resistor.

(3) Offsets and the reference contribute t o output effect

where R
output effects when external input/feedback elements are substituted for the internal reference and voltage con­trol in special applications.

(4) Valid with one output terminal grounded or connected so that the common mode current (see PAR. 1.5e) does not

flow through the load or (in current mode) through a sensing resistor. Evaluated in the 20Hz to 10MHz frequency
range.

(4)

Ripple <0.2mV <0.02% of

Noise <1.0mV <0.1% of

∆

∆

is the feedback resistor and Ri is the input resistor from the signal reference. Use the offsets t o calculate

f

EO = ∆E

VOLTAGE

MODE

∆E

O

<0.005% or

0.2mV

IO) are measured across an external sensing resistor. This resistor must be a high

/ Ri) ±∆Eio (1 + Rf / Ri) (Rf)

ref (Rf

CURRENT MODE

(1)

∆

EO, by the equation

∆I

3mA

I

O

I

O

(2)

O

max

max

AMPLIFIER OFFSETS

VOLTAGE MODE

∆E

O

µV

<10

<200

µV

µV

<20

µV

<20

--

CURRENT MODE

1.7 SPECIFICATIONS, PERFORMANCE

1.7.1 VOLTAGE CONTROL CHANNEL

a) LOCAL OUTPUT VOLTAGE CONTROL: 10-turn precision potentiometer at the front

panel, resolution: 0.1% of the maximum rated output voltage (E
LOC-REM switch (accessible through the top cover) is set to LOC (towards the front
panel), this pot controls output voltage from zero to E
scale) calibrations are provided. Local voltage control from the front panel is enabled by
the link installed on the rear panel terminal block TB501, between terminals 6 (RVC) and
7 (RPV1); the remote voltage control resistor between terminals 7 (RPV1) and 8 (RPV2)
must be removed.

b) REMOTE OUTPUT VOLTAGE CONTROL: When the E

ble through the top cover) is set to REM (towards the rear panel), external control can be
exercised by resistance (1000 ohms per volt of output); refer to Section 3 for details. This
allows the output to be controlled from zero to E
nominal. Both ZERO (same as LOCAL ZERO) and FS (full scale) calibrations are pro­vided. Remote voltage control using resistance is enabled by removing the link installed
on the rear panel terminal block TB501 between terminals 6 (RVC) and 7 (RPV1) and
installing the voltage control resistor between terminals 7 (RPV1) and 8 (RPV2).

max.). When the E

O

max. Both ZERO and FS (full

O

LOC-REM switch (accessi-

OUT

max with an accuracy of 0.1% of E

O

OUT

O

JQE 26956 081111 1-3

NOTE: The default ZERO voltage calibration done at the factory is for local control. Because

the front panel voltage control potentiometer has a value higher that zero (usually

0.05% of the nominal value of the potentiometer) when set to the full counterclockwise
position, the ZERO calibration is inaccurate if the remote control resistor reaches a
perfect zero. Therefore, when operating with a remote control resistor in voltage mode,
it is recommended that the ZERO and FULL SCALE adjustments be recalibrated (see
PAR 4.5.2.2. and 4.5.5).

c) REMOTE ERROR SENSING: Rear terminals provide for connection of error sensing

leads directly at the load. The four-terminal load connection compensates for the voltage
drop along the load wires. Up to 0.5 Volt per load wire can be compensated using
remote sensing.

1.7.2 CURRENT LIMIT CONTROL CHANNEL

a) LOCAL OUTPUT CURRENT LIMIT CONTROL “A”: 10-turn precision potentiometer at

the front panel, controls the current limit from less than 10% to 100% of the rated output
current (I

MODEL

JQE 15-12MVPY-26954 5 4.3

JQE 55-5MVPY-26955 5 2.7

JQE 150-1.5MVPY-26956 1.5 0.4

) (see Table 1-3). Current control “A” accuracy is 0.5% of IO nominal.

O

TABLE 1-3. CURRENT LIMIT VALUES

CURRENT LIMIT “A”

NOMINAL VALUE

(AMPS)

CURRENT LIMIT “B”

NOMINAL VALUE

(AMPS)

a) LOCAL AND REMOTE OUTPUT CURRENT LIMIT CONTROL “B”: A 10-turn precision

potentiometer at the front panel controls the current limit from 1% to 105% of the nominal
“B” value (see Table 1-3). Current control “B” accuracy is 0.5% of the nominal “B” value.
When Current Limit “B” is active, if the unit is operating in current limit mode, the lowest
value of current limit “A” and “B” functions as the current limit for the unit. Current control
“B” is enabled by the link installed on the rear panel terminal block TB502 between pin 1
(REF) and pin 2 (RPC1); if this link is removed, only current control “A” is active.

When Current Limit “B” is active, remote resistive control is possible by connecting an
external variable resistance between terminal 2 (RPC1) and terminal 3 (RPC2) of
TB502. The external resistance will be in parallel with the 500 Ohm front panel LIMIT “B”
potentiometer. A zero ohm external resistance will reduce current limit “B” to approxi­mately 1% of the nominal “B” value. The adjustment curve is non-linear, proportional to:

where
R

is the external resistive control value in Ohms

ext

R

is the front panel Current Limit Control “B” value (500 Ohms nominal value for full

int

clockwise positon.

1.7.3 CURRENT MONITOR

A current monitor voltage output is available to externally monitor output current. This output
signal is available at rear terminal block TB503 across terminals 1 (+C MON) and 2 (–C MON).
The transfer factor of the current monitor signal is 50mV/A. Both ZERO and FS calibrations for
the Current Monitor signal are provided.

5

R

()R

()

int

---------------------------------+
R

+

intRext

ext

1-4 JQE 26956 081111

The Current Monitor signal accuracy is 1% of the nominal Current Limit “A” value. The internal
impedance of the C-MON output signal is less than 50Ohms. The recommended withdraw cur­rent from this output is 2mA. This output is protected against temporary or permanent short-cir­cuit. The short-circuit current is 5mA.

The C. MON signal is referenced to –OUTPUT (INTERNAL), prior to the 0.01Ohm
sensing resistor of the C. MON circuitry. Care must be taken when handling this
signal to avoid short-circuiting the output of the unit

1.7.4 DYNAMICS

a) VOLTAGE RECOVERY FOR STEP-LOAD CURRENT: The time required for the stabi-

lized output voltage to recover within the load effect band (or 2 mV, whichever is greater)
is less than 50 microseconds.

b) CURRENT RECOVERY FOR STEP-LOAD VOLTAGE: The time required for the stabi-

lized output current to recover within the load-effect band is governed by an (exponen­tial) RC time constant, where "R" represents the load resistance and "C" is the tabulated
(Table 1-1) shunt capacitance.

c) PROGRAMMING SPEED: The rate at which the JOE power supply responds to a step-

program is determined by the setting of the current limit control, the value of the load
resistance and the tabulated (Table 1-1) shunt capacity.

WARNING

d) OUTPUT IMPEDANCE (See Table 1-1): The DC and low frequency value is given by the

tabulated (Table 1-2) load effects. With increasing frequency, the output impedance
becomes asymptotic to the tabulated (Table 1-1 series inductance (Voltage Mode) or
shunt capacitance (Current Mode).

1.7.5 GENERAL

a) CROWBAR SPECIFICATIONS: The electronic "crowbar" circuit consists of a silicon con-

trolled rectifier (SCR) and a sensing amplifier. If the output voltage exceeds a pre-viously
set adjustable limit, the power supply output is shorted by the SCR and the input circuit
breaker is tripped off.

1) Adjustable Limit Range: 5% of E

2) Triggering Time: 5 - 10µS, with adjustable delay (25 ±5µS to 180 ± 40µS) to minimize
false triggering.

3) Threshold: Limit point may be set to within 5% of E
greater.

b) METERS: Two 2 inch, recessed panel meters, 3% of full scale accuracy are provided for

output voltage and current monitoring.

1.8 SPECIFICATIONS, MECHANICAL

a) DIMENSIONS AND FINISH: Refer to Mechanical Outline Drawing, Figure 1-1.

. to 1.3 x E

Onom

Onom

.

or 0.25 Volt, whichever is

Onom,

b) BAIL: A retractable bail is provided for convenient bench operation of the power supply.

JQE 26956 081111 1-5

OVP DELAY

C. MON FS

C. MON ZERO

OVP ADJ.

ADJ.

2953-2

"

"

"

B

P

"

O

A

B

M

C

M

C

"

"

M

R

T

O

E

U

L

Z

O

E

T

S

U
O

F

E

1

O

E

-

O

T

T

E

O

S

S

3

U

U

L

R

R

R

C

O

O

5

F

F

E

T

T

9

E

E

U

U

Z

T

T

2

S

O

O

G

U

U

T

F

O

O

E

A

E

U

I

I

O

L

I

FIGURE 1-1. MECHANICAL OUTLINE DRAWING (SHEET 1 OF 2)

1-6 JQE 26956 081111

TB502

1

RPC1REF RPC2

TB501

1

TB503

1

+C. −C.

MONNCMON

Flushing, NY, USA

MODEL NO. JQE XX−2695X
SERIAL NO.

0 TO XXV

DC

0 TO XXA

OUTPUT

R

VOLTAGE: 115 / 230V

AC

FREQUENCY: 50 / 60Hz

INPUT

CURRENT: XXA

JQE XX-MVPY-2695X

FIGURE 1-1. MECHANICAL OUTLINE DRAWING (SHEET 2 OF 2)

JQE 26956 081111 1-7/(1-8 Blank)

SECTION 2 - INSTALLATION

2.1 UNPACKING AND INSPECTION

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

2.2 TERMINATIONS

a) Front Panel: Refer to Figure 2-1 and Table 2-1.

FIGURE 2-1. FRONT PANEL CONTROLS AND INDICATORS, JQE SPECIAL MODELS

TABLE 2-1. FRONT PANEL CONTROLS AND INDICATOR FUNCTIONS

CONTROL OR INDICATOR FUNCTION

AC POWER CIRCUIT BREAKER Turns a-c power to unit ON or OFF and protects power supply input circuitry.

AC PILOT LIGHT Energizes when unit is turned ON and a-c power is applied to the unit.

VOLTMETER Monitors output voltage 0 to EO max.

AMMETER Monitors output current 0 to IO max. "A"

VOLTAGE CONTROL Adjusts output voltage from 0 to EO max.

CURRENT LIMIT CONTROL "A" Adjusts current limit A from 10% to 100% of IO max. "A"

CURRENT LIMIT CONTROL "B" Adjusts current limit B from 1.0% to 105% of IO max. "B"

JQ E SPE C IAL S VC 0 8 1111 2-1

b) Rear Panel: Refer to Figure 2-2 and Table 2-3.

FIGURE 2-2. REAR PANEL TERMINATIONS, JQE SPECIAL MODELS

TABLE 2-2. REAR PANEL TERMINATION FUNCTIONS

TERMINATION FUNCTION

TB501 8-terminal

terminal block

(Output, Sense

and Remote

Voltage Control

connections)

TB 502 3-terminal

terminal block

(Remote Current

Programming

connections)

TB 503 3-terminal

terminal block

(Current Monitor

connections)

Chassis Ground EARTH - GND must be connected to this stud to ensure safe operation of the unit.

AC Line Cord Three-wire, single phase safety line cord.

NOTE: JQE Specials are shipped with links in place connecting the following pairs of terminals:

RPV1 and RVC, +S and +V, –S and –V on TB501 and REF and RPC1 on TB502.

(1) –S Output Sense (–)

(2) –V Power Output (–)

(3) GND Chassis Ground

(4) +V Power Output (+)

(5) +S Output Sense (+)

(6) RVC Resistive Voltage Control: Connected to one end of front panel VOLTAGE control

potentiometer

(7) RPV1 Remote Programming Voltage Control (1) is the null (summing junction) for the voltage loop:

Used for external (remote) resistive control.

(8) RPV2 Remote Programming Voltage Control (2): Used for external (remote) resistive control.

(1) REF Reference: Summing junction for current limit control "B."

(2) RPC1 Remote Programming Current 1: Internal and external (remote) resistive control 1.

(3) RPC2 Remote Programming Current 2: Internal and external (remote) resistive control 2.

(1) +CM Current Monitor (+) Positive terminal for current monitor (voltage) signal.

(2) –CM Current Monitor (–) Negative terminal for current monitor (voltage) signal.

(3) NC Not Connected.

2-2 JQE S PEC I AL S V C 0 8 1111

c) Internal Adjustments and Calibrations: Refer to Figure 2-3 and Table 2-3.

OVP DELAY ADJ. (A4 R(C) 403)

C. MON FS (A4R432)

C. MON ZERO (A4R430)

OVP ADJ. (A4 R415)

E ZERO

OUT

E

FS LOC

OUT

OUT

E LOC

OUT

E REM

E

LAG COMP

OUT

E

OUT

FS REM

FS "A"

OUT

I

ZERO "B"

OUT

I

FS "B"

OUT

I

FIGURE 2-3. LOCATION OF INTERNAL ADJUSTMENTS

TABLE 2-3. INTERNAL ADJUSTMENTS

REFERENCE

DESIGNATION

CONTROL PURPOSE

A4R(C)403 OVP DELAY ADJ Adjusts delay time of Overvoltage Protection. PAR. 4.4

A4R432 C. MON FS Calibrates full scale for the current monitor signal. PAR. 4.6.4

A4R430 C. MON ZERO Calibrates zero for the current monitor signal. PAR. 4.5.3

A4R415 OVP ADJ Adjusts Overvoltage Protection level. PAR.4.4

A1R14 E

A1R4 E

A1S1 E

ZERO Calibrates zero for output voltage. PAR. 4.5.2

OUT

FS LOC Calibrates full scale for output voltage controlled from

OUT

OUT

LOC – E

REM Enables output voltage control from either front panel

OUT

front panel VOLTAGE potentiometer (local).

(local) or remote location using a variable resistance.

A1R16 EO LAG COMP Adjusts for stability (eliminates oscillation) in voltage

mode.

A1R33 EO FS REM Calibrates full scale output voltage using remote resistive

control.

A1R19 I

A1R56 I

A1R54 I

FS "A" Calibrates full scale for output current limit "A." PAR. 4.6.5

OUT

ZERO "B" Calibrates zero for output current limit "B." PAR. 4.6.2

OUT

FS "B" Calibrates full scale for output current limit "B." PAR. 4.6.3

OUT

ADJUSTMENT

PROCEDURE

PAR. 4.5.2.1

PAR . 4.5.5

PAR . 4.3

PAR. 4.5.2.2

JQ E SPE C IAL S VC 0 8 1111 2-3

2.3 AC INPUT REQUIREMENTS

This power supply is normally supplied for operation on a single phase, nominal 115V AC line.
For conversion to 230V AC line operation, refer to FIG. 2-4. Remove the two wire jumpers
between transformer terminals indicated. Re-connect one (1) jumper between terminals indi­cated. Do not change any other wiring on the transformer.

FIGURE 2-4. CONVERSION TO 230V AC LINE OPERATION

2.4 COOLING

The power transistors and rectifiers in this power supply are maintained within their operating
temperature range by means of a high efficiency heat-sink assembly, coded by an internal fan.
SIDE PANEL OPENINGS AND THE TOP OF THE CASE MUST BE KEPT CLEAR FROM
OBSTRUCTIONS TO INSURE PROPER AIR CIRCULATION. Periodic cleaning of the interior
of the power supply is recommended. If the power supply is rack mounted, or installed into con­fined spaces, care must be taken that the ambient temperature does not rise above the limit
specified (Refer to Section 1).

2.5 PRELIMINARY OPERATIONAL CHECK

A simple operational check after unpacking and before equipment installation is advisable to
ascertain whether the power supply has suffered damage resulting from shipping. Refer to Fig­ures 2-1 and 2-2 for location of operating controls and electrical connections.

1. Connect power supply to 115V AC line or refer to paragraph 2.3 for 230V AC operation if
required.

2. Verify that the following links are installed at the rear panel (see Figure 2-2) and that the con­nection is tight:
TB501 between –S and –V terminals
TB501 between +S and +V terminals
TB501 between RVC and RPV1 terminals
TB502 between REF and RPC1 terminals

3. Turn CURRENT LIMIT CONTROL "A" and "B" full clockwise. Turn VOLTAGE CONTROL
fully counterclockwise.

4. Connect a DVM to terminal +S and DVM return to –S of TB501 at the rear panel.

5. Turn AC POWER circuit breaker "on." The AC PILOT LIGHT should be energized. Slowly
turn VOLTAGE CONTROL clockwise and verify the front panel voltmeter shows a gradual

2-4 JQE S PEC I AL S V C 0 8 1111

increase of the output voltage up to E
fully clockwise, the DVM voltage reads E

nominal. Verify that when the VOLTAGE control is

O

nominal (±0.1% EO nominal).

O

6. Check the "crowbar" action of the overvoltage protection by adjusting the output voltage to
E

nominal using the front panel VOLTAGE control. Through the access hole in the top

O

cover, slowly adjust the OVP ADJ pot counterclockwise until the input circuit breaker trips.
Turn the OVP ADJ pot 1/4 turn clockwise. Turn AC POWER circuit breaker "on" and verify
that the unit stays on.

7. Turn AC POWER circuit breaker "off." Place a precison 4-terminal shunt across the output.
Connect the DVM to the shunt’s sensing terminals (DVM return to the sensing terminal of the
shunt that is connected to –V power terminal at TB501). Turn CURRENT LIMIT CONTROL
"A" fully clockwise and CURRENT LIMIT CONTROL "B" fully counterclockwise.

8. Turn AC POWER circuit breaker "on." Slowly turn front panel CURRENT LIMIT CONTROL
"B" clockwise and observe the gradual increase in output current at the front pannel amme­ter. Check that at the full clockwise position of the CURRENT LIMIT CONTROL "B" the DVM
reads 1.05 x I

nominal "B" value (± 0.5% IO nominal "B" value).

O

NOTE: Use the following formula to obtain output current I

IO(Amperes)

V

---------------------------------------------=
R

SHUNT

DVM

(Volts)

(Ohms)

from the DVM voltage readings:

O

2.6 INSTALLATION (REFER TO FIGURE 1-1, OUTLINE DRAWING)

The JQE specials may be used as a bench-operated instrument. A retractable "bail" is provided
to lift the power supply front to a convenient viewing and operating angle. If the supply is to be
rack-mounted, the bail, the two rear feet and the side handles must be removed.

For all installations into confined spaces, care must be taken that the temperature immediately
surrounding the unit does not exceed the maximum specified ambient temperature (71°C).

2.7 GROUNDING

AC GROUND. The power supply is equipped with a 3-wire safety line cord and polarized plug.
The third (green) wire in the line cord is connected to the chassis and the case of the unit.

WARNING

For safe operation It is recommended that the rear panel stud marked be
connected to the appropriate earth ground.

DC GROUND. The DC output is isolated from the AC power line and from any direct connection
to chassis or ground. The maximum voltage that can be supported between either output termi­nal and ground or chassis is 500V DC plus the maximum output voltage of the power supply.
Either side of the output may be grounded. A convenient grounding terminal is provided at the
rear terminal block TB501 GND terminal.

JQ E SPE C IAL S VC 0 8 1111 2-5/(2-6 Blank)

SECTION 3 - OPERATION

3.1 STANDARD POWER SUPPLY OPERATION, LOCAL CONTROL

3.1.1 GENERAL

The Power Supply is shipped from the factory with three (3) removable jumper links in place at
the rear barrier strip TB501 as shown in FIG. 3-1, as well as a link between REF and RPC1 ter­minals of rear barrier strip TB502 that enables the front panel CURRENT LIMIT “B” control.
THESE LINKS MUST BE IN PLACE AND SECURED TIGHTLY for standard local operation.
Loose terminal links or wires at the barrier strip will cause malfunction of the power supply.

3.2 LOAD CONNECTION

The load may be connected in either of the two ways illustrated (Figure 3-1).

3.2.1 LOCAL ERROR SENSING (SEE FIGURE 3-1A.)

This type of load connection is recommended for constant load applications. Install the links
between +S and +V terminals and between –S and –V terminals of TB501 at the rear panel.
Load connecting wires should be as heavy as practicable, since load wire voltage drops will
degrade regulation performance. Twisting of load wires will help to preserve the low output
impedance as well as reduce the coupled and radiated noise of the power supply.

LOAD CONNECTION,

DEFAULT JUMPER LINKS INSTALLED,

WITHOUT REMOTE ERROR SENSING

FIGURE 3-1. LOAD CONNECTION SHOWING A FLOATING LOAD

3.2.2 REMOTE ERROR SENSING (SEE FIGURE 3-1B.)

Remove the links between +S and +V terminals and between –S and –V terminals of TB501 at
the rear panel. Specified regulation performance DIRECTLY AT THE LOAD requires the use of

LOAD CONNECTION

WITH REMOTE ERROR SENSING

(KELVIN CONNECTION)

JQ E SPE C IAL S VC 0 8 1111 3-1

remote error sensing. A twisted, shielded pair of wires from the sensing terminals directly to the
load will compensate for load wire voltage drops up to 0.5 volt per wire (Refer to Figure 3-1B).
Observe polarities: for example, the positive sensing wire (from TB 501 +S) goes to the positive
load terminal (connected to terminal +V).

To keep the DC voltage drop in the load connecting wires to a minimum, and to preserve the
dynamic characteristics of the power supply (AC stability, output impedance and recovery time),
load wires should be as short as possible and as large in diameter as practicable. Error sensing
leads should be #22 AWG and as short as possible. Both lead pairs should preferably be tightly
twisted. For minimum ripple and noise pick-up, the error sensing leads must be shielded. The
shield should be returned to the ground point of TB501.

3.2.3 GROUNDED LOAD CONNECTION

If the load has one end connected to EARTH-GND, then connect the load termination con­nected to EARTH-GND to +V of TB501 at the rear panel for better output noise performance
(see Figure 3-2A). For this configuration the voltage across the load will be negative with
respect to chassis GND,

If the load is floating, but it is desired to have the JQE having the output with a certain polarity
with respect to chassis GND, connect locally at TB501, either + V terminal to GND for a nega­tive output voltage referenced to chassis GND (see Figure 3-2B), or connect -V terminal to GND
for a positive output voltage referenced to chassis GND (see Figure 3-2C).

GROUNDED LOAD CONNECTION,

FOR A NEGATIVE OUTPUT

WITHOUT REMOTE ERROR SENSING

FIGURE 3-2. GROUNDED LOAD CONNECTIONS

NEGATIVE OUTPUT

REFERENCED TO CHASSIS

WITHOUT REMOTE ERROR SENSING

POSITIVE OUTPUT

REFERENCED TO CHASSIS

WITHOUT REMOTE ERROR SENSING

3-2 JQE S PE C IAL S VC 0 8 1111

3.3 OUTPUT ADJUSTMENT

Once the load is connected to the output terminals of the power supply as described in the pre­vious paragraphs, the operating voltage may be adjusted to the desired value by turning the
VOLTAGE CONTROL and observing the front panel VOLTMETER.

If the link is present between terminals REF and RPC1 of barrier strip TB502 at the rear panel,
CURRENT LIMIT CONTROL “A” is recommended to be set fully clockwise, then use either
CURRENT LIMIT CONTROL “B” or the remote resistance connected between terminals RPC1
and RPC2 of barrier strip TB502 to control the current limit.

If the link is removed between terminals REF and RPC1 of barrier strip TB502 at the rear panel,
both CURRENT LIMIT CONTROL “B” and the remote control of current limit via terminals RPC1
and RPC2 are disabled; use CURRENT LIMIT CONTROL “A” to establish the current limit.

CURRENT LIMIT CONTROL “A” or “B” may also be set to intermediate values, as desired, by
first turning the AC POWER circuit breaker to the "off" position and then placing a short circuit
across the output. Turn AC POWER circuit breaker "on." Now the required operating current is
adjusted by turning CURRENT LIMIT CONTROL “A” or “B” to the value needed. For a more pre­cise current limit adjustment use a 4-terminal shunt connected at the output as specified in PAR.

2.5 step 7. The range for current limit “A” is 10% to 100% of I

rent limit “B” is 1% to 105% of I
shunt. After the short is removed from the output, the voltage protection can be set.

With the OVP ADJ potentiometer set fully clockwise, set the output voltage as described above.
Turn the OVP ADJ potentiometer slowly counterclockwise, until the power supply output "crow­bars," indicated by the output voltage going to zero and the circuit breaker tripping. Turn the
OVP ADJ potentiometer 1/4 turn clockwise. A too close adjustment towards the operating volt­age may lead to spurious triggering, especially if the "delay" adjustment is set for maximum sen­sitivity. The minimum "threshold" voltage protection adjustable is 5% of E
OVP DELAY ADJ potentiometer if required. This control is factory adjusted for maximum sensi­tivity, consistent with reliable operation without spurious triggering. It needs re-adjustment only if
extremely sensitive loads must be triggered in the shortest time possible and if some spurious
triggering can be tolerated. Now the load can be connected to the power supply and operation
can commence.

nominal “A.” The range for cur-

nominal “B.” Turn off the unit and remove the short-circuit or

O

O

nominal. Adjust the

O

3.4 INTRODUCTION TO REMOTE PROGRAMMING

3.4.1 GENERAL

A few general remarks may be in order to familiarize the user of this equipment with the termi­nology and basic equations pertaining to remote programming of Kepco Power Supplies. Elec­trically, the power supply, consists of the unregulated DC source (E
the DC error amplifier (A

) and a comparison circuit which resembles a four-arm electrical

V

), the pass element (EP),

U

bridge. (Refer to Figure 3-3). The elements of the bridge are arranged to produce a virtual zero
at the amplifier input when the bridge circuit is at balance (VAA' = 0). Any tendency for the out­put voltage to change in relation to the reference voltage (E

) creates an error signal (E) which,

r

by means of negative feedback and the amplifier, tends to correct the output voltage towards
restoration of bridge balance.

JQ E SPE C IA L S VC 0 8 1111 3-3

= BRIDGE CURRENT

NULL JUNCTION

REFERENCE

RESISTOR

REFERENCE

VOLTAGE

VOLTAGE

ERROR

AMPLIFIER

VOLTAGE

CONTROL

RESISTOR

UNREGULATED

PASS - ELEMENT

COMMON POINT

SOURCE

OUTPUT

VOLTAGE

FIGURE 3-3. COMPARISON BRIDGE (SIMPLIFIED) FOR VOLTAGE MODE

A similar bridge representing power supply operation in CURRENT LIMIT mode is shown in Fig­ure 3-4

= BRIDGE CURRENT

NULL JUNCTION

REFERENCE

RESISTOR

CURRENT FEEDBACK

RESISTOR

CURRENT

ERROR

AMPLIFIER

UNREGULATED

CURRENT CONTROL

VOLTAGE REFERENCE

SOURCE

PASS - ELEMENT

INTERNAL CURRENT

SENSING RESISTOR

COMMON POINT

OUTPUT

CURRENT

LIMIT

LOAD

FIGURE 3-4. COMPARISON BRIDGE (SIMPLIFIED) FOR CURRENT MODE

3-4 JQE S PE C IAL S VC 0 8 1111

3.4.2 EQUATIONS SHOWING THE OPERATION OF THE KEPCO BRIDGE

The following relationships govern the operation of the Kepco Bridge at balance in voltage
mode, i.e., with VAA’ = 0.

E

R

O

VC

------------=
R

r

=

b

(1)

(2)

Where: EO = Output Voltage

E

= Reference Voltage

r

= Reference Resistance

R

r

R

= Voltage Control Resistance

VC

= Bridge Control Current

I

b

-------­E

r

E

r

------I
R

r

E

=

OIbRVC

(3)

The ratio of Ohms control - resistance needed per volt output is termed the “CONTROL RATIO.“
It is 1000 Ohms/Volt for remote resistive control only. For local control the ratio is determined by
the front panel VOLTAGE control potentiometer value and tolerance.

As can be seen from equation (1), the output voltage E

can be controlled by varying any one of

O

the three quantities. Rewriting equation (1) we have

E

r

The ration constitutes the bridge control current I

Therefore we can write E

Making I
E

O

a precision quantity establishes a precise programming ratio, so that the accuracy of

b

is solely dependent upon R

------

E

O

E

r

-----­R

r

RVC×=

R

r

(Eq. (2).

b

= IbR

O

(Eq. (3).

VC

This mode of operation is referred to as Resistance Program-

VC.

ming and is covered in detail in PAR. 3.6.

NOTE: For all programming and adjustment components, use high quality, wire-wound resis-

tors with a T.C. of 20 p.p.m or better.

Similar relationships can be described for operation in Current Limit mode. The following rela­tionships govern the operation of the Kepco Bridge at balance in current mode, i.e., with VAA’ =

0.

IORSK

----------------------

I

=

O

I

=

O

E

---------------------­KSRSR

--------------­KSR

R

S

CF

(4)

-----------=

R

CF

CF

R

r

(5)

E

r

r

E

r

-----­R

S

(6)

r

r

R

Where: EO = Output Voltage

= Reference Voltage

E

r

R

= Reference Resistance

r

= Bridge or Control Current

I

b

K

= Current Sensing Amplification Factor

S

= Current Sensing Resistor

R

S

R

= Current Feedback Resistor

CF

R

CF

---------------

I

=

O

JQ E SPE C IA L S VC 0 8 1111 3-5

KSR

I

b

S

(7)

R

CF

The ratio of termed the “CONTROL RATIO,“ gives the current (in mA) needed to obtain

one Ampere of output current where R

--------------­KSR

S

is in Ohms and RCF is in KOhms.

S

3.5 GENERAL RULES FOR REMOTE PROGRAMMING

All remote programming applications require the observance of a few basic rules to insure
proper functioning of the power supply in the particular mode of operation selected. These rules
should be remembered before each application, and especially if malfunctioning of the program­ming set-up is experienced.

3.5.1 GROUNDING

Ground loops due to multiple and indiscriminate grounding of various equipment are the cause
of the majority of complaints about "high ripple or noise." They can be easily avoided by ground­ing the power supply at one point only to which all shielded cables and equipment cases are
connected. If possible, one side (preferable the positive one) of the power supply output should
also be grounded.

3.5.2 CONNECTIONS

All external connections, especially the rear barrier strip terminal screws, must be tight. Series
malfunctions may be caused by open feedback loops, error sensing lines or programming con­nections.

3.5.3 PROGRAMMING RESISTORS

Programming resistors should be high quality wirewound units with temperature coefficients of
20 parts per million or better. Their wattage rating must be at least 10 times the actual power
dissipated. Although the control current through these resistors is only 1 mA, an error current
spike exists when programming large voltage excursions. The peak of the current is limited by
the internal 500 Ohm resistor and depends upon the magnitude of output voltage swing. The
time constant is determined by the internal 500-Ohm resistor and the unit’s output capacitance
given in Table 1-1 for current mode.

3.5.4 EXTERNAL SWITCHING

If step-switch devices are used in resistance programming, they must be of the "make before
break" variety to avoid programming infinity. Programming resistors must have a voltage rating
at least equal to the maximum output voltage of the power supply.

3.6 OUTPUT VOLTAGE PROGRAMMING WITH EXTERNAL RESISTANCE

The output voltage of the Power Supply may be controlled remotely by an external resistance,
replacing the built-in voltage control resistance which is disconnected at the rear barrier strip;
this is accomplished by removing the link between terminals RVC and RPV1 at terminal block
TB501 at the rear panel. Refer to Figure 3-5 and install a variable resistance across terminals
RPV1 and RPV2 of TB501. To maintain a calibrated “programming ratio” of 1000 Ohms/V, the
switch labelled E
E

REMOTE. The value of the programming resistance may be calculated by referring to the

OUT

LOCAL - E

OUT

REMOTE (accessible through the top cover) must be set to

OUT

transfer function derived earlier (Eq. 1)

E

r

------

=

E

R

O

VC

×

R

(1)

r

3-6 JQE S PEC I AL S VC 0 8 1111

Since E

=Ib (2), it follows that EO = IbRVC (3).

r/Rr

Referring to Equation (3), since I

is 1mA (precisely adjusted as shown in PAR. 4.5.5), for every

b

Volt of output, 1000 Ohms control resistance must be provided.

1. Determine value of programming resistor(s) for output voltage desired.

2. Using two-wire, shielded cable, connect the chosen resistors to terminals RPV1 and
RPV2 at terminal block TB501 on the rear panel. Connect the shield to the GND termi­nal of TB501.

3. The output voltage (Volts) will be 1mA x R

, (where RVC is in KOhms).

VC

FIGURE 3-5. REMOTE RESISTANCE PROGRAMMING (VOLTAGE MODE)

3.7 CONSTANT CURRENT OPERATION

JQE special power supplies will deliver constant current depending on the output voltage and
output current limit settings as well as the load value. In constant current operating mode, the
voltage comparison bridge is interconnected with the internal current sensing resistor, R
current control, R

(as shown in Figure 3-6) to maintain a constant voltage drop across RS. In

CC

, and a

S

this way, an adjustable constant load current is obtained. Characteristic of the constant current
supply is ability to change its output voltage automatically in order to maintain a constant current
through a range of possible load resistances. The range of output voltage that the supply can

JQ E SPE C IA L S VC 0 8 1111 3-7

deliver and simultaneously maintain constant current, is referred to as the "COMPLIANCE
VOLTAGE.”

FIGURE 3-6. REMOTE RESISTANCE PROGRAMMING (CURRENT MODE)

3.8 OUTPUT CURRENT PROGRAMMING WITH EXTERNAL RESISTANCE

If Current limit “B” is enabled, the Current Limit “B” value, controlled by the I

front panel

LIM B

control, can be modified by a remote resistance. This is accomplished by first Installing a link
between terminals REF and RPC1 of TB502 at the rear panel and set front panel control I

LIM A

fully clockwise. Then refer to Figure 3-6 and connect a remote resistance between terminals
RPC1 and RPC2 of TB502 at the rear panel.

The remote current control limit value will be determined by the following equation:

R

×

cciRcce

-------------------------------+

R

I

()eI

lim B

=

cco

()

lim B

---------------------------------------------------

⋅

i

R

+

R

cciRcce

+

ccoRcci

3-8 JQE S PEC I AL S VC 0 8 1111

where

(I

lim B)e

= Current limit “B” determined by the external resistance connected to terminals

RPC1 and RPC2 of TB502.

(I

lim B)i

= Current limit “B” determined by the internal resistance only (with external resistance

disconnected).

R

cco

= 5 Ohms (tolerance ±1%) = the initial value of internal current control “B” for full

counterclockwise position.

R

cci

= the value of internal current control “B.” The current value of R

with the unit turned off, using a digital ohmmeter connected between terminals
RPC1 and RPC2 of rear barier strip TB502. The nominal value of R
wise position is 500 Ohms (tolerance ±5%).

R

cce

= the value of external resistance connected in parallel with internal current control

“B.”

NOTE: If R

cci

and R

I

()eI

lim B

are much higher than R

cce

=

()

lim B

-------------------------------

⋅

R

i

cciRcce

can be measured

cci

for fully clock-

cci

, the above equation can be simplified as:

cco

R

cce

+

JQ E SPE C IA L S VC 0 8 1111 3-9/(3-10 Blank)

SECTION 4 - CALIBRATION

4.1 GENERAL

It is recommended that both output voltage and output current limit calibrations be performed in
sequence, however it is permissible to do only one if the other is known to be calibrated.
Required test equipment is listed in PAR. 4.2.
are listed in Table 1-1 for each model.

4.2 TEST EQUIPMENT REQUIRED

The following test equipment is required to perform the calibration procedures in this section.

a). Resistive load, variable, with ON/OFF and SHORTING SWITCH and capable of dissi-

pating the full output power of the unit under test.

b). Digital DC voltage monitor (DVM), digital voltmeter, or power supply analyzer.

E

Onom

, I

Onom

, I

Limit “A”

and I

Limit “B”

c). External programming Resistor: value in KOhms: E

d). Precision Current Sensing Resistor (Shunt): 0.1 Ohm, ±0.1%, 50W, 20ppm/°C.

e). AC ripple monitor, sensitivity better than 1 mV. Ballantine Model 302C. or Hewlett Pack-

ard Model 400H or Oscilloscope, vertical sensitivity better than 0.1 mV/cm.

4.3 LAG NETWORK ADJUSTMENT

An a-c stability control in the form of a lag network has been provided in this power supply. This
network has been factory adjusted for maximum amplifier stability when operating into a resis­tive load. Re-adjustment is indicated if components affecting the a-c characteristics of the ampli­fier must be replaced, or if the load connected to the power supply contains excessive
capacitance or inductance, causing a-c instability (usually indicated by high-frequency oscilla­tion as observed with an oscilloscope across the power supply load). In such cases, the lag net­work should be adjusted so that stable operation is resumed. In extreme cases if adjustment of
the lag network should not prove sufficient, twisted load and error sensing wires or decoupling
capacitance directly across the load may provide a solution to the problem.

1. Connect the power supply to the particular operating load using +V and –V terminals of
TB501 at the rear panel.

2. Use an oscilloscope connected across the load to monitor oscillation.

3. Turn on the JQE special power supply and adjust E
(accessible through top cover) so that the output is free of oscillation while the unit is oper­ating in Voltage Mode with the designated load.

/1mA, tolerance: 0.01%.

Onom

LAG COMP potentiometer

Onom

4. Turn the JQE special power supply off and disconnect load from +V and –V terminals of
TB501 at the rear panel.

4.4 OVERVOLTAGE PROTECTION (OVP) TEST AND ADJUSTMENT

1. Use the VOLTAGE control at the front panel to set the output voltage to a typical opera­tional voltage as measured by either the front panel voltmeter or by an external DVM.

JQE SPECIAL OPR 081111 4-1

2. Turn OVP DELAY ADJ potentiometer (accessible through top cover) to approximately the
middle position (five turns from one end).

3. Slowly, turn the OVP ADJ potentiometer counterclockwise until the power supply circuit
breaker trips OFF. Then turn OVP ADJ potentiometer clockwise 1/4 turn.

4. Turn on the JQE special power supply. The circuit breaker should not trip and the output
voltage, measured by either the front panel voltmeter or by the external DVM, should the
same as step 1 above.

NOTE: The OVP circuit causes the circuit breaker to trip and initiates the Output Crowbar, a

solid state switch (thyristor) across the output. Adjust OVP DELAY ADJ potentiometer
so that the circuit breaker does not trip while the unit is operating with your particular
load and application. To avoid tripping the circuit breaker unnecessarily, for example
upon encountering load transients, a compromise must be made between the follow­ing:

• Rapid OVP action (minimum tolerance for output overvoltage):
OVP DELAY ADJ set to full counterclockwise position and

• Maximum delay of OVP action (where some overvoltage is acceptable):
OVP DELAY ADJ set to full clockwise position.

5. Repeat steps 1 through 4 above for any desired operational output voltage above 5%
E

.

Onom

4.5 OUTPUT VOLTAGE CALIBRATION

The output voltage calibration consists of the following calibration procedures which must all be
performed in sequence: Pre-calibration Setup (PAR 4.5.1), Zero Output Voltage (PAR 4.5.2),
Zero Current Monitor (PAR 4.5.3), Local Full Scale (FS) Output Voltage (PAR 4.5.4), and
Remote Full Scale (FS) Output Voltage (PAR 4.5.5).

4.5.1 VOLTAGE PRE-CALIBRATION SETUP

Turn the power supply off and verify the following:

1. At the rear panel links between -S and -V, +S and +V, RVC and RPV1 on TB501 and
between REF and RPC1 of TB502 are installed and securely tightened

2. Set the E

LOC-REM switch (accessible through top cover) to LOC position (towards the

OUT

front panel).

3. Turn front panel I

"A" and I

lim

"B" controls to the full clockwise position.

lim

4. Turn front panel VOLTAGE control to the full counterclockwise position.

4.5.2 ZERO OUTPUT VOLTAGE CALIBRATION

Zero Output voltage is calibrated for either the local front panel VOLTAGE control (PAR 4.5.2.1)
or an external resistance used for remote programming of output voltage (4.5.2.2).

4-2 JQ E SPE C IA L 0 81111

4.5.2.1 ZERO OUTPUT VOLTAGE (LOCAL PROGRAMMING) CALIBRATION

The following procedure calibrates the front panel VOLTAGE control for 0V output when set to
minimum. Due to slight resistance present even when the VOLTAGE control is set to minimum,
this calibration may not be accurate in remote mode where an external resistance is used for
remote programming of the output (see PAR. 4.5.2.2 if using remote programming).

1. Connect DVM between +S and -S of TB501 with the DVM reference terminal connected to
–S terminal.

2. Turn ON the unit, and allow unit to operate for 10 to 15 minutes before proceeding.

3. Adjust E
0V (tolerance: +0.025% of E

ZERO potentiometer (accessible through top cover) until output voltage reads

OUT

to +0.05% of E

Onom

Onom

).

4.5.2.2 ZERO OUTPUT VOLTAGE (REMOTE PROGRAMMING) CALIBRATION

The following procedure calibrates the output for 0V when using an external resistance for
remote programming of the output. See PAR. 4.5.2.1 if using front panel VOLTAGE control to
program the output.

1. Remove the link between terminals RVC and RPV1 of TB501 at the rear panel.

2. Connect the External Programming resistor (see PAR. 4.2) between terminals RPV1 and
RPV2 of TB501 at the rear panel.

3. Set the E

LOC-REM switch (accessible through top cover) to REM position (towards

OUT

the back panel)

4. Connect DVM between terminals +S and –S of TB501 with the DVM reference terminal
connected to –S terminal.

5. Turn the unit on and adjust the external programming resistance for minimum output volt­age and allow unit to operate for 10 to 15 minutes before proceeding.

6. Adjust E
0V (tolerance –0 to +0.025% of E

ZERO potentiometer (accessible through top cover) until output voltage reads

OUT

Onom

).

7. Restore pre-calibration settings (PAR 4.5.1, steps 1 through 4).

4.5.3 ZERO CURRENT MONITOR CALIBRATION

1. At the rear panel. connect DVM to +C.MON of TB503, referenced to -C.MON of TB503.

2. Adjust C.MON ZERO potentiometer (accessible through top cover) until Output Current
Monitor signal reads 0V (tolerance ±0.1mV).

4.5.4 LOCAL FULL SCALE (FS) OUTPUT VOLTAGE CALIBRATION

1. Set front panel VOLTAGE control to the full clockwise position.

2. Connect DVM between +S and –S of TB501 with the DVM reference terminal connected to
–S terminal.

JQE SPECIAL OPR 081111 4-3

3. Adjust FS LOC potentiometer (accessible through top cover) until output voltage reads
E

(V) (tolerance ±0.1% of E

Onom

Onom

).

4.5.5 REMOTE FULL SCALE (FS) OUTPUT VOLTAGE CALIBRATION

1. Turn the JQE special power supply off.

2. Remove the link between terminals RVC and RPV1 of TB501 at the rear panel.

3. Connect the fixed External Programming resistor (see PAR. 4.2) between terminals RPV1
and RPV2 of TB501 at the rear panel. The resistor value should be E
KOhms, tolerance: 0.01%

(Volts)/1mA in

Onom

4. Set the E

LOC-REM switch (accessible through top cover) to REM position (towards

OUT

the back panel)

5. Turn the unit on and adjust E
until output voltage reads E

Onom

FS REM potentiometer (accessible through top cover)

OUT

(V) (tolerance ±0.1% of E

4.6 OUTPUT CURRENT LIMIT CALIBRATION

Output current limit calibration consists of the following procedures: Pre-Calibration setup (PAR.

4.6.1), Zero (Minimum) Output Current Limit "B" (PAR. 4.6.2), Full Scale (maximum) Output

Current Limit "B" (PAR. 4.6.3), Full Scale Current Monitor (PAR. 4.6.4), Full Scale Output Cur­rent Limit "A" (PAR. 4.6.5).

4.6.1 CURRENT LIMIT PRE-CALIBRATION SETUP

1. Current measurements are made by measuring the voltage drop across the sense resistor
(see PAR. 4.2) and then converting the result to current using the following formula. It is
critical that the actual value of the sense resistor be measured accurately.

R

Calculated output current [Amperes] = (

= the measured value of the sense resistor in ohms (0.01% accuracy).

SENSE

V

2. Turn the JQE special power supply off and, if connected, remove the external remote pro­gramming resistor from terminals RPV1 and RPV2 of TB501.

[Volts])/R

DVM

Onom

SENSE

).

[Ohms]

3. Install link between terminals RVC and RPV1 of TB501.

4. Set the E

LOC-REM switch (accessible through top cover) to LOC position (towards the

OUT

front panel).

5. Turn front panel I

6. Turn front panel I

"A" control to the full clockwise position.

lim

"B" controls to the full counterclockwise position.

lim

7. Turn front panel VOLTAGE control to the full clockwise position.

8. Connect precision 4-terminals Current Sensing Resistor (Shunt) (see PAR 4.2) across the
output, between terminals +V and –V of TB501 at the rear panel.

9. Connect the DVM to the Shunt's sensing terminals with the DVM reference terminal con­nected to the terminal closest to the –V terminal on TB501. Use the Shunt measured value
to correct the Output Current DVM readings.

4-4 JQ E SPE C IA L 0 81111

4.6.2 ZERO (MINIMUM) OUTPUT CURRENT LIMIT "B" CALIBRATION

1. Turn ON the unit, and allow unit to operate for 10 to 15 minutes before proceeding.

2. Adjust I

ZERO "B" potentiometer (accessible through top cover) for current of 1% of

OUT

Current Limit "B" (see Table 1-1) (minimum output) in Amperes, tolerance ±0.5% of Current
Limit "B."
JQE 15-12MVPY-26954 = 0.043A ± 0.021A
JQE 55-5MVPY-26955 = 0.027A ±0.013A
JQE 150-1.5MVPY-26956 = 0.004A ±0.002A

4.6.3 FULL SCALE (MAXIMUM) OUTPUT CURRENT LIMIT "B" CALIBRATION

1. Turn front panel I

2. Adjust I

FS "B" potentiometer (accessible through top cover) for 105% of Current Limit

OUT

"B" control to the full clockwise position.

lim

"B" (see Table 1-1) , tolerance ±0.5% of Current Limit "B."
JQE 15-12MVPY-26954 = 4.515A ±0.021A
JQE 55-5MVPY-26955 = 2.835A ±0.013A
JQE 150-1.5MVPY-26956 = 0.420A ±0.002A

3. Record the value for use during FS Current Monitor calibration (PAR. 4.6.4).

4.6.4 FS CURRENT MONITOR CALIBRATION

1. Connect DVM to terminal +C.MON referenced to terminal –C.MON of TB503 at the rear
panel.

2. Adjust C.MON FS potentiometer (accessible through top cover) for DVM reading of
(50 x I

) in mV, tolerance: ±0.5 x I

Onom

in mV. NOTE: I

Onom

is the value recorded in

Onom

step 3 of PAR. 4.6.3 above.

NOTE: The nominal value of the current monitor transfer factor is 50mV/A.

4.6.5 FULL SCALE OUTPUT CURRENT LIMIT "A" CALIBRATION

1. a) Turn the JQE special power supply off

2. b) Remove the link between REF and RPC1 of TB502.

3. Turn front panel I

"A" controls to the full clockwise position.

lim

4. Turn the JQE special power supply on

5. Adjust I

FS "A" potentiometer (accessible through top cover) for 100% of Current Limit

OUT

"A" (see Table 1-1) , tolerance ±0.5% of Current Limit "A").
JQE 15-12MVPY-26954 and JQE 55-5MVPY-26955 = 5.0A ±0.025A
JQE 150-1.5MVPY-26956 = 1.5A ±0.0075A

6. Turn off the unit and restore the link between REF and RPC1 terminals at TB502 at the rear
panel

JQE SPECIAL OPR 081111 4-5/(4-6 Blank)

SECTION 5 - THEORY OF OPERATION

5.1 SIMPLIFIED DIAGRAM DISCUSSION

Referring to Figure 5-1, the main power transformer converts the line voltage to the required lev­els needed to produce the d-c operating voltages for the Main and Auxiliary Supplies. The main
power supply is in series with the pass elements and the current sensing RESISTOR and pro­duces the output voltage.The main pass elements are changing their series resistance to keep
the output voltage constant. The necessary drive for this change is produced by the driver circuit
which, in turn, receives its command signals either from current error amplifier A or B or the volt­age error amplifier.

The output voltage is constantly compared to the voltage reference source, while the output cur­rent, monitored by the current sensing resistor, is compared to the current reference source.
Any change, in either output voltage or current, is amplified by the associated amplifier and
transferred to the diode-gate which feeds directly into the driver circuit which produces the
needed drive signal for the main pass elements, thus either keeping the output voltage constant,
or, if the signal from the current limit amplifier is dominant, limiting the output current to the pre­adjusted value.

The Overvoltage Crowbar is connected across the output terminals of the power supply. A por­tion of the output voltage is continuously compared to an internal reference. If an overvoltage
occurs; the SCR "crowbar" will short-circuit the output immediately. Recycling takes place auto­matically, since the a-c input power is removed by the tripping of the circuit breaker.

5.2 CIRCUIT DESCRIPTION

For the purpose of analysis, the circuitry of the JQE special power supplies may be divided into
several sections which are individually described below. The overall schematic diagram (Figure
7-8) and the detailed schematic diagrams (Figures 7-9 through 7-11) Illustrate the circuitry
described in this section.

5.2.1 A-C INPUT CIRCUIT.

A-C line power is introduced through the a-c input barrier-strip or a heavy-duty three-wire line
cord with safety plug. The use of a grounded a-c power outlet will automatically ground the
power supply, since the third wire of the line cord is directly connected to the metal chassis and
case. Once the a-c power circuit breaker (CB101) is closed, the primary of the main transformer
(T201), the fan (B201) and the a-c pilot light (DS101) will be energized. The two primary wind­ings of the main transformer are either connected in parallel (for 115V a-c nominal line voltage)
or in series (for 230V a-c nominal line voltage). The a-c power circuit breaker (CB101), aside
from switching the a-c primary power, has the function of disconnecting the power supply from
the a-c line in case of input overloads, short circuits, heatsink overtemperature or output over­voltage. CB101 has two sensing coils, one of which is always in series with one of the primary
windings on T201 (T2-T5), whether the main transformer is wired for 115V or for 230V a-c. The
second sensing coil of CB101 is in series with the secondary winding on T201 which generates
operating potential for the overvoltage protection circuit (T201-T6, T7). If an overload occurs,
due to either internal component failure or crowbar action of the voltage protector, the coil is
energized sufficiently to activate the trip mechanism of CB101, thus disconnecting the power
supply from the a-c line.

JQ E SPE C IA L S VC 0 8 1111 5-1

FIGURE 5-1. JQE SPECIAL POWER SUPPLY, SIMPLIFIED SCHEMATIC DIAGRAM

5-2 JQE S PEC I AL S VC 0 8 1111

Since the primary coil of the AUXILIARY POWER TRANSFORMER (T202) is in parallel with the
secondary for the overvoltage protection circuit, any failure in the auxiliary circuits, reflecting
back to the primary of the auxiliary power transformer (T202) will also activate the sensing coil
of CB101 and shut down the power supply. A thermal sensing element (S301) is mounted to the
heatsink assembly (A3) to protect the series regulator transistors from overtemperature. If the
preset temperature on S301 is exceeded, its contact closes and energizes the sensing coil of
CB101, resulting once more In the tripping of the a-c power circuit breaker and subsequent
removal of the a-c input power from the power supply.

5.2.2 MAIN D-C SUPPLY

The main d-c power is derived from a center-tapped secondary winding on T201. A full-wave
rectifier circuit with silicon diodes (CR201, CR202) operates into a capacitor input filter (C201 or
C201/C202) which is paralleled by a bleeder resistor (R202). The main d-c supply delivers the
output current via the series regulator or pass-element.

5.2.3 PASS-ELEMENT SECTION

The pass element section varies in complexity according to the output voltage and current rating
of the particular model. The NPN silicon pass-transistors of the JQE are located on high-effi­ciency heatsinks and are cooled by a fan (B201). These models have a single heatsink assem­bly (A3) with NPN transistors. The number of transistors depends on the individual model. While
in the low voltage/high output current models (E
a parallel circuit, higher voltage models (E
arrangement of their pass-transistors. However complex the pass-element section, for analytical
purposes it can be reduced to a single pass-transistor. Electrically, this pass-element is part of a
series circuit consisting of the unregulated main d-c power supply, the external load and the
pass-transistor. The output voltage of the power supply is kept constant, regardless of variations
in the unregulated supply, by changing the series resistance of the control element (the pass­transistor) in the described series circuit. The necessary base-drive for the pass-transistors to
affect the change in series resistance is supplied by the “Darlington” connected driver stages.
The main driver stages, in turn, receive their base signals from the pre-driver stage (A1Q2).

< 36 Volts) all pass-transistors are arranged in

O

> 36 Volts) use a series/parallel configuration in the

O

5.2.4 VOLTAGE ERROR AMPLIFIER (VEA)

The main function of the voltage error amplifier A1IC1 (see Figure 7-9) is to amplify the d-c error
signal, derived from the comparison bridge, to a level suitable to pass the diode gate circuit and
drive the pre-driver stage A1Q2. The voltage error amplifier is a d-c coupled, high-gain opera­tional amplifier. The amplifier input may be disconnected from the internal comparison bridge
circuit, and programmed externally. Although the amplifier is used in the non-inverting configu­ration, a positive input signal will produce a negative power supply output with respect to the
“common” (plus sensing terminal +S), since the pass-elements provide another signal inversion.
If a link is installed between TB501, terminals 6 (RVC) and 7 (RPVC1) (see Figure 7-8) and the
E

LOCAL - E

OUT

REMOTE switch is set to E

OUT

LOCAL, the output voltage is controlled by

OUT

front panel VOLTAGE control R102. When the link between between TB501, terminals 6 (RVC)
and 7 (RPVC1) is removed and the E

LOCAL - E

OUT

REMOTE switch is set to E

OUT

OUT

REMOTE, output voltage can be controlled by an external resistance connected across TB501,
terminals 7 (RPVC1) and 8 (RPVC2).

5.2.5 CURRENT LIMIT CIRCUIT

The differential input of the current sensing amplifier, A1IC2A, is connected to the current sens­ing resistor (R

= R203). The amplified voltage drop across the current sensing resistor is con-

S

tinuously compared to the reference voltage, set by the current limit control. As long as the

JQ E SPE C IA L S VC 0 8 1111 5-3

amplified voltage developed across RS (due to load current flow) is less than the preset refer­ence level, the current limit amplifier will be biased to its inactive state and will not affect the out­put. If the output current increases however, the voltage drop across R
reference level set by the current limit control. The current limit amplifier will be activated and
produce a drive signal at the diode gate greater than the output of the voltage error amplifier,
thereby taking control away from the voltage error amplifier and transferring the power supply
into current limit mode. Since both the current limit amplifier and voltage error amplifier are cou­pled through the diode gate circuit to the pre-driver stage A1Q2, the amplifier with the greater
(negative) output will control the pass transistors and therefore the output.

Current Limit "A" uses A1IC3 as the current error amplifier, while Current Limit "B" uses A1IC4.
The reference for Current Limit "A" is delivered by A1IC2B, using R101 (front panel Current
Limit "A" control) as the controlling potentiometer. Current Limit "B" uses A1IC5 as the reference
stage using R103 (front panel Current Limit "B" control) as the controlling potentiometer. If the
link between terminal block TB502, terminals 1 (REF) and 2 (RPC1) is installed, both current
limit "A" and "B" loops are enabled, however the one with the lowest current limit value controls
the unit. If Current Limit "B" is in control, this value may be modified by a remote resistance con­nected across TB502, terminals 2 (RPC1) and 3 (RPC2). If the link between block TB502, termi­nals 1 (REF) and 2 (RPC1) is removed, Current Limit "B" is disabled.

5.2.6 OVERVOLTAGE PROTECTION CIRCUIT AND CURRENT MONITOR

Input and output connections for the overvoltage protection circuit (VP) are made via a single
connector, P401/J407. The circuit receives a-c voltage derived from a secondary of the main
transformer (T201). The a-c is rectified by a conventional bridge rectifier (A4CR1), capacitor fil­tered by the input filter capacitor (A4C1) and shunt regulated by a 15V zener diode (A4CR3). A

6.5-Volt source, derived from the pre-regulated DC voltage by means of shunt regulator A4IC1,
provides a stable reference source referenced to C1 (–) (minus).

will overcome the

S

The overvoltage protection circuit contains output sensing voltage differential amplifier IC2 and
voltage comparator IC3A. This circuit compares the output sensing voltage with the adjustable
voltage limit level. Once triggered, the comparator’s output is integrated (A4CR14, A4C6, and
A4C9), providing an adjustable delay through R(C)403 and A4IC3B.

In the event of an overvoltage, resulting either from external causes or from internal power sup­ply failure, the circuit become active. A4CR402 will be turned on, producing an output pulse.

As the first S.C.R. (CR402) is conducting, it performs two functions: It shorts out the DC supply
for the voltage protection circuit, thereby creating an overcurrent in one of the circuit breaker
coils. Simultaneously, CR402 generates a firing pulse for the main S.C.R. (CR203), which
through its ”crowbar” action short-circuits the power supply output. The a-c circuit breaker
(CB101) trips due to the action of the first S.C.R. (CR402), disconnecting the power supply from
the power line. The protection circuit is automatically re-activated with the ”turn-on” of the power
supply via CB101.

The current monitor circuit (A4IC4) amplifies the signal across the second current sensing resis­tor (A4R24) connected in the –OUTPUT leg of the power supply. The transfer factor is 50mV/A.
The current monitor signal is available at terminals +C MON and –C MON of terminal block
TB503 at the rear panel.

5.2.7 AUXILIARY SUPPLIES

AMPLIFIER POWER SUPPLY. This full wave, bridge rectified source is derived from a second-

ary winding on the auxiliary transformer (T202). Rectified by A1CR8, the supply is capacitor fil-

5-4 JQE S PEC I AL S VC 0 8 1111

tered by A1C2. A current regulator stage, A1Q3, followed by a string of zener diodes, A1CR10
to A1CR13, provides the operating voltage for the amplifiers, ±13.5V and ±6.2V reference volt­ages.

PRE-DRIVER COLLECTOR SUPPLY. A full wave rectified (A1CR6) and capacitor filtered
(A1C7) supply is derived from a secondary winding on T202. It delivers collector voltage to the
pre-driver stage A1Q2.

CONSTANT CURRENT RETURN SUPPLY. This full-wave rectified auxiliary supply is derived
from the winding of the auxiliary power transformer. Rectified by A1CR1 and filtered by A1C1,
constant current is applied to the base of the pass transistors (via the constant current generator
stage A1Q1, thus insuring the control of the Pass-Element for zero output voltage and/or zero
output current.

5.2.8 METERING CIRCUIT

Both output voltage and output current are monitored by dual range front panel meters (M101,
M102). While the output voltage is measured directly across error sensing terminals 1 (–S) and
5 (+S) of terminal block TB501, the output current is measured indirectly as a voltage drop
across the current sensing resistor (R203).

JQ E SPE C IA L S VC 0 8 1111 5-5/(4-6 Blank)

SECTION 6 - MAINTENANCE

6.1 GENERAL

This section covers maintenance procedures, installation of optional components, calibration
and test measurements of the JQE Special Power Supplies. Conservative rating of components
and the non-congested layout should keep maintenance problems to a minimum. If trouble does
develop however, the easily removed wrap-around cover and the plug-in feature of the circuit
boards provide exceptional accessibility to all components of the supply.

6.2 DISASSEMBLY/REASSEMBLY (REFER TO FIGURE 6-1.)

WARNING

Turn power off and disconnect unit from

power source before disassembling.

6.2.1 COVER REMOVAL

The wrap-around cover may be taken off by loosening and removing its twelve (12) holding
screws, five (5) on each side and two (2) on the front panel.

6.2.2 A1 CIRCUIT BOARD REMOVAL

The A1 printed circuit board is mounted with two (2) screws and either two (2) or six (6) washers
as shown in Figure 6-1, which are removed from the side. Set aside hardware for reassembly.
After removal of the four printed circuit board edge connectors and 3-wire cables from A1J1 and
A1J2, the board may be lifted from its slide-guide.

REASSEMBLY NOTES: A1 circuit board is floating; be sure to reassemble the hardware as
shown in Figure 6-1 to maintain electrical isolation from the bracket and avoid inadvertent
shorts.

FIGURE 6-1. A1 PC BOARD, REASSEMBLY

JQ E SPE C IA L S VC 0 8 1111 6-1

6.2.3 A5 TERMINAL BLOCK CIRCUIT BOARD REMOVAL

Separate rear panel from the chassis by removing three screws at the bottom of the rear panel.
Unplug the PC board edge connector, two 2-wire cables from A5J1 and A5J2 and tag and dis­connect wires from six Quick-disconnect connectors A5J5, A5J12, A5J7, A5J4, A5J6 and
A5J10. Remove the plastic covers from the three terminal strips TB501, TB502, TB503. Sepa­rate A5 board and two insulators from rear panel by removing five nuts and five washers
accessed from inside the unit.

REASSEMBLY NOTES: Remember to reinstall the two insulators between A5 board and the
rear panel.

6.2.4 A3 HEAT SINK REMOVAL

The heat sink assembly is mounted with four (4) screws to the chassis bottom. After the screws
are taken out, the heat sink may be removed after disconnecting the PC board edge connec­tor(s) and the wires from the Quick-disconnect terminals: one from the heat sink (model 26954
only) and two from the thermal switch.

6.2.5 A4 OVERVOLTAGE PROTECTION CIRCUIT BOARD REMOVAL

Remove the two holding screws as indicated (Refer to Figure 6-1). Separate the edge connector
at the bottom and lift the circuit board and bracket assembly out of the chassis. Disconnect the
2-wire cables from A4J1 and A4J2 and the wires from Quick-disconnect connectors A4J4 and
A4J5 The circuit board can be separated from the bracket by removing two nuts and washers.

6.2.6 REASSEMBLY.

Reassembly of all components takes place in reverse order of the above described procedures.

6.3 TROUBLESHOOTING

Modern, high performance power supplies require thorough understanding of the problems
involved in repairing complex, solid state circuitry. Servicing beyond simple parts replacements
should consequently be attempted only by personnel thoroughly familiar with solid state compo­nent techniques and with experience in closed loop circuitry.

The heat sink and main rectifier are electrically isolated from the chassis.

The metal parts of these components are at high d-c voltage levels

Troubleshooting charts, showing resistance and voltage readings, are of very limited usefulness
with feedback amplifiers and are not included here. Instead a detailed circuit description (Sec­tion 5), parts location diagrams, simplified functional schematics and a main schematic and
detailed schematic diagrams are presented.

The following basic steps in a case of power supply malfunctioning may also be found useful:

1. If power supply does not function at all. Check all power connections and make certain,
power supply is connected to the correct line voltage (it is normally delivered for 115V AC
operation). Verify that the input voltage is present at the a-c outlet where the unit is plugged
in.

WARNING

referenced to chassis

6-2 JQE S PEC I AL S VC 0 8 1111

2. No D-C Output:

• Check rear terminal block jumper (link) connections for correct placement and tight seat
(Refer to FIG. 5-1).

• Check auxiliary supply voltages for A1 and A4 boards for 115V a-c input (see Table 6-1)

TABLE 6-1. AUXILIARY SUPPLY VOLTAGES

MEASUREMENT

POINT

A1C2 (–) –30V ±1.6V –30V ±1.6V –30V ±1.6V Referenced to +S Terminal

A1C10 (+) +13.5V ±0.7V +13.5V ±0.7V +13.5V ±0.7V Referenced to +S Terminal

A1C11 (–) –13.5V ±0.7V –13.5V ±0.7V –13.5V ±0.7V Referenced to +S Terminal

A1CR3 cathode +6.2V ±0.3V +6.2V ±0.3V +6.2V ±0.3V Referenced to +S Terminal

A1CR17 anode –6.2V ±0.3V –6.2V ±0.3V –6.2V ±0.3V Referenced to +S Terminal

A1C7 (+) +7.6V ±0.15V +11.7V ±0.2V +12.8V ±0.3V Referenced to +S Terminal

A1CR19 cathode +6.8V ±0.3V +6.8V ±0.3V +6.8V ±0.3V Referenced to +S Terminal

A1C1 (–) –16.2V ±0.3V –16.5V ±0.3V –16.5V ±0.3V Referenced to –V Terminal

A1R1 (common

with A1Q1 emitter)

A4C1 (+) +29.5V ±0.6V +27.5V ±0.6V +30.3V ±0.6V Referenced to –V Terminal

A4CR3 cathode +15.0V ±0.8V +15.0V ±0.8V +15.0V ±0.8V Referenced to –V Terminal

A4R3 (common

with A4IC1 pin 3)

A4CR10 anode –6.5V ±0.3V –6.5V ±0.3V –6.5V ±0.3V Referenced to +S Terminal

JQE 15-12MVPY-

26954

–10.3V ±0.6V –10.3V ±0.6V –10.3V ±0.6V Referenced to –V Terminal

+6.5V ±0.3V +6.5V ±0.3V +6.5V ±0.3V Referenced to –V Terminal

JQE 55-5MVPY-

26955

JQE 150-

1.5MVPY-26956

NOTES

1. High D-C Output: If the output voltage is high and not controllable by the voltage control,
identical steps as outlined in step 2 above for No d-c output are advisable. In addition, if the
condition persists, check the following:

• Check the pre-driver transistor* (A1Q1 ) and the main driver (Q305) as well as all pass­element transistors located on heat sink assembly A3.

• Check the voltage control resistor (R102) for continuity. Monitor output with an oscillo­scope and observe ripple wave-form and amplitude. If high frequency oscillations are
observed, proceed as directed by PAR. 4.3. High 60 Hz ripple is often due to failure in
one of the rectifier circuits.

2. Input Circuit Breaker Trips at Power-up

• Set the OVP ADJ potentiometer 1/4 turn clockwise.

• For local operation, verify that EOUT LOC-REM switch is set to LOC position (towards
front panel). Verify that link between terminals RVC and RPV1 of TB501 on the rear
panel is installed.

JQ E SPE C IA L S VC 0 8 1111 6-3

• For remote operation, verify that EOUT LOC-REM switch is set to REM position
(towards rear panel). Verify that link between terminals RVC and RPV1 of TB501 on the
rear panel is removed. Verify remote programming resistor is connected between termi­nals RPV1 and RPV2 of TB501 on the rear panel.

3. Input Circuit Breaker Trips During Operation

• Use properly rated (output current) twisted pair wires for power terminal (+V, –V) con­nections as well as remote error sensing

• If remote error sensing is used, use properly rated (#22AWG recommended) twisted pair
wires for sense terminal (+S, –S) connections to the load.

• If the unit is operated at full power with maximum input voltage, check that the ambient
operating temperature surrounding the unit is within specified limits (see PAR 1.5).

• Verify that the pass-element transistors are tight to the heat sink and that silicone grease
was used beteen the transistor and heat sink. If problem recurs, replace thermoswitch
mounted on heat sink assembly.

4. If the power supply is basically functioning, but poor performance is evident, inspect the test
set-up to make certain the source of the trouble is not external.

5. Poor regulation in any of the regulating modes is usually traceable to incorrectly connected
loads or faulty measurement techniques. Perform measurements as described in Paragraph

6.4.2.

6. Oscillation of the output voltage or output current is often due to a load with a large inductive
component. Twisted load wires of sufficient diameter and held as short as practical, are often
the solution to the problem. Refer to to PAR. 4.3 for lag network adjustment.

7. Kepco Application Engineers are available for consultation or direct help in difficult service or
application problems.

6.4 POWER SUPPLY MEASUREMENTS

Measurement of the significant parameters of a power supply is a requirement for incoming
inspection, periodic maintenance, or after component replacement. Since the measurements
require special techniques to ensure correct results, suggestions for their performance are given
below.

6.4.1 REQUIRED TEST EQUIPMENT.

1. Constant AC supply voltage with provisions for "stepping" the voltage over a specified
region (105-125V); a variable autotransformer is generally adequate, if it is rated to
deliver the input current of the unit under test.

2. Resistive load, variable, with ON/OFF and SHORTING SWITCH and capable of dissi­pating the full output power of the unit under test.

3. DC voltage monitor, digital voltmeter, or power supply analyzer.

4. Current sensing resistor, for current regulation measurements, four-terminal device.

6-4 JQE S PEC I AL S VC 0 8 1111

5. AC ripple monitor, sensitivity better than 1 mV. Ballantine Model 302C. or Hewlett Pack­ard Model 400H.

6. Optional: Oscilloscope, vertical sensitivity better than 0.1 mV/cm.

6.4.2 MEASUREMENT INSTRUCTIONS

a. Output Voltage Measurement. The principle governing this method of measurement is sim-

ple: DO NOT MEASURE ANY VOLTAGE DROPS DUE TO LOAD CURRENT FLOW. This
can only be avoided by measuring regulation directly at the sensing leads.

b. Source and Load Effect in Voltage Mode is defined as the amount of output voltage change

resulting from a specified change of line voltage or from a change in load resistance. It can
be expressed as an absolute change ∆E

voltage E

:

O

% Voltage Effect

c. Current Source and Mode Effect in Current Mode is defined as the amount of output current

change resulting from a specified change in line voltage or from a change in load resistance.
I t can be expressed as an absolute change ∆I

output current I

:

O

or as a percentage in reference to the total output

O

∆ E

O

-----------­E

100 %×=

O

, or as a percentage in reference to the total

O

∆ I

O

% Current Effect

----------­I

O

100 %×=

d. RMS ripple may be monitored on a true RMS-reading instrument connected in parallel with

the regulation analyzer leads. Careful wire dressing and shielding, as well as good a-c
grounding are of the utmost importance if valid measurements are expected. An oscilloscope
may also be used for p-p readings of noise and ripple. An approximate RMS reading can be
calculated from the p-p reading of the oscilloscope if the reading is divided by three.

JQ E SPE C IA L S VC 0 8 1111 6-5/(6-6 Blank)

SECTION 7 - ELECTRICAL PARTS LIST AND DIAGRAMS

7.1 GENERAL

This section contains the schematic diagrams, the parts location diagrams, and a list of all
replaceable electrical parts. All components are listed in alpha-numerical order of their refer­ence designations. Consult your Kepco Representative for replacement of parts not listed here.

7.2 ORDERING INFORMATION

To order a replacement part or inquire about parts not listed in the parts list, address order or
inquiry either to your authorized Kepco Sales Representative or to:

Specify the following information for each part:

• Power Supply Model number, Serial number, and Revision number stamped on the
nameplate of the unit.

• Kepco part number. See Parts List.

• Circuit Reference Designation. See Schematic Diagram.

KEPCO, INC.
131-38 Sanford Avenue
Flushing, NY 11355

• Description. See Parts List.

To order a part not listed in the parts list, give a complete description and include its function
and location.

NOTE: Kepco does not stock or sell complete power supply subassemblies as described here

and elsewhere in the instruction manual. Some of the reasons are listed below:

1. Replacement of a complete subassembly is a comparatively rare necessity.

2. Kepco's subassemblies are readily serviceable, since most of them are the "plug- in"
type.

3. The nature of a closed loop power supply system requires that subassembly replace­ment be followed by careful measurement of the total power supply performance. In
addition, depending on the function of the subassembly, extensive alignment may be
required to restore power supply performance to specified values.

If repairs involving subassembly replacements are required, please contact your local Kepco
representative or the Kepco Sales Engineering department in Flushing, New York, NY.

JQ E SPE C IA L S VC 0 8 1111 7-1

7.3 ABBREVIATIONS USED IN KEPCO PARTS LISTS

7.3.1 REFERENCE DESIGNATORS

A=Assembly

B = Blower (Fan)

C = Capacitor

CB = Circuit Breaker

CR = Diode

DS = Device. Signaling (Lamp)

F=Fuse

7.3.2 DESCRIPTIVE ABBREVIATIONS

A=Ampere

a-c = Alternating Current

AMP = Amplifier

AX = Axial

CAP = Capacitor

CER = Ceramic

CT = Center-tap

ºC = Degree Centigrade

d-c = Direct Current

DPDT = Double Pole, Double

Throw

DPST = Double Pole, Single

Throw

ELECT= Electrolytic

F=Farad

FILM = Polyester Film

FLAM = Flammable

FP = Flame-Proof

ºF = Degree Fahrenheit

FX = Fuse Holder

IC = Integrated Circuit

J = Jack

K = Relay

L = Inductor

LC = Light-Coupled Device

LED = Light Emitting Diode

FXD = Fixed

Ge = Germanium

H=Henry

Hz = Hertz

IC = Integrated Circuit

K = Kilo (10

m = Milli (10

3

)

-3

)

MFR = Manufacturer

MET = Metal

n=Nano (10

-9

)

NC = Normally Closed

NO = Normally Open

p = Pico (10

-12

)

PC = Printed Circuit

POT = Potentiometer

PIV = Peak Inverse Voltage

p-p = Peak to Peak

ppm = Parts Per Million

M=Meter

P=Plug

Q = Transistor

R=Resistor

T = Transformer

TB = Terminal Block

X = Socket

PWR = Power

RAD = Radial

RECT = Rectifier

RECY= Recovery

REG = Regulated

RES = Resistor

RMS = Root Mean Square

Si = Silicon

S-end = Single Ended

SPDT = Single Pole, Double

Throw

SPST = Single Pole, Single

Throw

Stud Mt.=Stud Mounted

TAN = Tantalum

TSTR = Transistor

µ = Micro (µ) (10

-6

)

V=Volt

W=Watt

WW = Wire Wound

7-2 JQE S PEC I AL S VC 0 8 1111

KEPCO REPLACEMENT PARTS LIST

JQE 150-1.5MVPY-26956 POWER SUPPLY (Figure 7-1) CODE: 1306457

REFERENCE

DESIGNATOR

QTY. DESCRIPTION

MFRS. NAME & PART NO.

(SEE BOTTOM NOTE)

KEPCO

PART N O.

REC. SPARE

PART Q TY.

FIGURE 7-1. JQE 150-1.5MVPY-26956 POWER SUPPLY, COMPONENT LOCATIONS

NOTE: REPLACEMENT PARTS MAY BE ORDERED FROM KEPCO, INC. ORDERS SHOULD INCLUDE KEPCO PART NUMBER AND DESCRIPTION.

PLEASE NOTE: THE MANUFACTURER'S NAME AND PART NUMBER LISTED FOR EACH ITEM ON REPLACEMENT PARTS LISTS REPRESENTS AT
LEAST ONE SOURCE FOR THAT ITEM AND IS LISTED SOLEY FOR THE CONVENIENCE OF KEPCO EQUIPMENT OWNERS IN OBTAINING
REPLACEMENT PARTS LOCALLY. WE RESERVE THE RIGHT TO USE EQUIVALENT ITEMS FROM ALTERNATE SOURCES. KEPCO, INC.

26956 SVC 081111 7-3

KEPCO REPLACEMENT PARTS LIST

JQE 150-1.5MVPY-26956 POWER SUPPLY (Figure 7-1) CODE: 1306457

REFERENCE

DESIGNATOR

QTY. DESCRIPTION

MFRS. NAME & PART NO.

(SEE BOTTOM NOTE)

@A1 1 MOUNTING BKT. KEPCO

128-1966

@A1 1 MOUNTING BKT. KEPCO

128-1967

@B201 1 BLADE, FAN

4.25 DIA, 7/32 HUB

KEPCO
149-0031

@C201 1 CAP. BKT. CORNELL DUBILIER

115058-06

B201 1 FAN, 3-POLE MOTOR

115VAC, 50/60HZ

CB101 1 CIRCUIT BREAKER, (HYDRAULIC

MAGNETIC), 2POLE 250VAC 1A/3A

CR201/CR202/
C205/C206/C207

1 RECT. ASS’Y (COMPONENTS

LISTED SEPARATELY)

CR201, CR202 2 RECT., SI RECTIFIER,

600V, 15A

C201 1 CAP., ELECTROLYTIC, CAN-TYPE,

1000UF, + 50 -20%, 350V

C204 1 CAP., ELECTROLYTIC, CAN-TYPE,

440UF, + 50 -10%, 200V

C205 1 CAP., CERAMIC,

0.02UF, 20%,1000V

FASCO ( JAKEL)
J238-087-8157

SENSATA TECHNOLOGY
UPGH-14-725-2

KEPCO
124-0397

INTERNATIONAL RECT,
1N3214

CORNELL DUBILIER
DCMC102T350AC2A

CORNELL DUBILIER
500441T200AB2A

STANDARD RADIO VISHAY
5GAS20

KEPCO

PART N O.

REC. SPARE

PART Q TY.

128-1966 1

128-1967 1

149-0031 1

128-0025 1

148-0049 1

127-0388 1

124-0397 1

124-0213 1

117-1302 1

117-0760 1

117-0104 1

C206, C207 2 CAP., CERAMIC,

0.01UF, 20%, 2000V

DS101 1 DEVICE, SIGNALING, NEON W/INT

RES, RD LENS, 115VAC

M101 1 METER, DC, SINGLE SCALE,

0- 1.5A, 2.0”, 2%

M102 1 METER, DC, SINGLE SCALE,

0- 150V, 2.0” 2%

R101 1 RES., VAR., MULTITURN, POTEN-

TIOMETER, 5 KOHM , 2W, 5%

R102 1 RES., VAR., MULTITURN, POTEN-

TIOMETER, 100 KOHM , 2W, 5%

R103 1 RES., VAR., MULTITURN, POTEN-

TIOMETER, 0.5 KOHM , 2W, 5%

R201 1 RES., FIX., POWER, AX. LEADS,

7.5 OHM, 5W, 5%

R202 1 RES., FIX., POWER, AX. LEADS,

20 KOHM, 5W, 5%

NOTE: REPLACEMENT PARTS MAY BE ORDERED FROM KEPCO, INC. ORDERS SHOULD INCLUDE KEPCO PART NUMBER AND DESCRIPTION.
PLEASE NOTE: THE MANUFACTURER'S NAME AND PART NUMBER LISTED FOR EACH ITEM ON REPLACEMENT PARTS LISTS REPRESENTS
AT LEAST ONE SOURCE FOR THAT ITEM AND IS LISTED SOLEY FOR THE CONVENIENCE OF KEPCO EQUIPMENT OWNERS IN OBTAINING
REPLACEMENT PARTS LOCALLY. WE RESERVE THE RIGHT TO USE EQUIVALENT ITEMS FROM ALTERNATE SOURCES. KEPCO, INC.

VISHAY CERA-MIT
20GAS10

CHICAGO MIN­IATU~2110QAX1

HONEYWELL
MODEL 504

HONEYWELL
MODEL 504

BOURNS INCORPORP
3590S-2-502

BOURNS INCORPORP
3590S-2-104

BOURNS INCORPORP
3590S-1-501L

VISHAY DALE
CW0057R500JB12

VISHAY DALE
CW00520K00JB12

117-0059 1

152-0087 1

135-0422 1

135-0472 1

115-1261 1

115-1645 1

115-3191 1

115-0982 1

115-1833 1

7-4 26956 SVC 081111

KEPCO REPLACEMENT PARTS LIST

JQE 150-1.5MVPY-26956 POWER SUPPLY (Figure 7-1) CODE: 1306457

REFERENCE

DESIGNATOR

QTY. DESCRIPTION

R203 1 RES., FIX., POWER, SHUNT (4

TERMINAL), 0.667 OHM , 50W, 1%

MFRS. NAME & PART NO.

(SEE BOTTOM NOTE)

KRL BANTRY
RAI222UAL-50-4TR

T201 1 TRANSFORMER, POWER, KEPCO

100-1892

T202 1 TRANSFORMER, AUX KEPCO

100-1865

KEPCO

PART N O.

REC. SPARE

PART Q TY.

115-1385 1

100-1892 1

100-1865 1

NOTE: REPLACEMENT PARTS MAY BE ORDERED FROM KEPCO, INC. ORDERS SHOULD INCLUDE KEPCO PART NUMBER AND DESCRIPTION.

PLEASE NOTE: THE MANUFACTURER'S NAME AND PART NUMBER LISTED FOR EACH ITEM ON REPLACEMENT PARTS LISTS REPRESENTS AT
LEAST ONE SOURCE FOR THAT ITEM AND IS LISTED SOLEY FOR THE CONVENIENCE OF KEPCO EQUIPMENT OWNERS IN OBTAINING
REPLACEMENT PARTS LOCALLY. WE RESERVE THE RIGHT TO USE EQUIVALENT ITEMS FROM ALTERNATE SOURCES. KEPCO, INC.

26956 SVC 081111 7-5

KEPCO REPLACEMENT PARTS LIST

JQE 150-1.5MVPY-26956 ASSEMBLY A1 (Figure 7-2) CODE: 2351431/2671532

REFERENCE

DESIGNATOR

QTY. DESCRIPTION

MFRS. NAME & PART NO.

(SEE BOTTOM NOTE)

KEPCO

PART N O.

REC. SPARE

PART Q TY.

FIGURE 7-2. JQE 150-1.5MVPY-26956 A1 ASSEMBLY, COMPONENT LOCATIONS

A1 ASSEMBLY UNIQUE PARTS

(SEE FOLLOWING LISTING FOR A1 ASSEMBLY COMMON PARTS)

C14 1 CAP., MYLAR, METALLIZED,

2200PF, 10%, 200V

C25 1 CAP., MYLAR, METALLIZED,

0.01UF, 20%, 200V

C6 1 CAP., MYLAR, METALLIZED,

0.5UF, 10%, 200V

C7 1 CAP., ELECTROLYTIC, AX. LEADS,

220UF, 20%, 16V

C8 1 CAP., MYLAR, METALLIZED,

0.047UF, 10%, 200V

NOTE: REPLACEMENT PARTS MAY BE ORDERED FROM KEPCO, INC. ORDERS SHOULD INCLUDE KEPCO PART NUMBER AND DESCRIPTION.
PLEASE NOTE: THE MANUFACTURER'S NAME AND PART NUMBER LISTED FOR EACH ITEM ON REPLACEMENT PARTS LISTS REPRESENTS
AT LEAST ONE SOURCE FOR THAT ITEM AND IS LISTED SOLELY FOR THE CONVENIENCE OF KEPCO EQUIPMENT OWNERS IN OBTAINING
REPLACEMENT PARTS LOCALLY. WE RESERVE THE RIGHT TO USE EQUIVALENT ITEMS FROM ALTERNATE SOURCES. KEPCO, INC.

CORNELL DUBILIER
WMC2D22K

VISHAY SPRAGUE
192P103X0200P303

STK ELECTRONICS
MM3705003K200

KEPCO
117-0677

SPRAGUE
192P5039

117-0659 1

117-0353 1

117-0123 1

117-0677 1

117-0362 1

7-6 JQE 26956 SVC 08-1111

KEPCO REPLACEMENT PARTS LIST

JQE 150-1.5MVPY-26956 ASSEMBLY A1 (Figure 7-2) CODE: 2351431/2671532

REFERENCE

DESIGNATOR

QTY. DESCRIPTION

Q1 1 TRANSISTOR, SI, NPN, POWER,

2N3584 250N 2 35 C NI

R1 1 RES., FIX., CARBON FILM,

300 OHM , 1/2W, 5%

R2 1 RES., FIX., CARBON FILM,

3 KOHM , 1/4W, 5%

R6 1 RES., FIX., PRECISION, METAL

FILM, 5.62 KOHM , 1/8W, 1%

R8 1 RES., FIX., PRECISION, METAL

FILM, 3.74 KOHM , 1/8W, 1%

R23 1 RES., FIX., CARBON FILM,

82 OHM , 1/2W, 5%

R24 1 RES., FIX., POWER, AX. LEADS,

16 KOHM , 3W, 5%

R42, R43, R44,
R45

4 RES., FIX., METAL FILM,

4.99 KOHM , 1/8W, 0.1%

R53 1 RES., FIX., METAL FILM,

10.7 KOHM , 1/8W, 0.1%

R57 1 RES., FIX., PRECISION,

5 OHM , 1W, 1%

MFRS. NAME & PART NO.

(SEE BOTTOM NOTE)

CENTRAL SEMICON
2N3584

IRC, INC.
CF-1/4 302 J T&R

VISHAY DALE
CCF555K62FKR36

VISHAY DALE
CCF-55 3741 F R36

YAGEO
CFR-50 JTJ52 300R

RCD COMPONENTS
RCD 135 163 JTW T & R

VISHAY DALE
PTF-56 4K99 B T-13 R36

VISHAY DALE
CMF5510K700BERE

VISHAY DALE
RS-1A-5 OHM 1%

KEPCO

PART N O.

REC. SPARE

PART Q TY.

119-0104 1

115-0783 1

115-2294 1

115-2409 1

115-2512 1

115-1243 1

115-2137 1

115-2863 1

115-2880 1

115-1374 1

A1 ASSEMBLY COMMON PARTS

(SEE PREVIOUS LISTING FOR A1 ASSEMBLY UNIQUE PARTS)

CR1, CR6, CR8 3 RECT., ENCAPSULATED BRIDGE

200V 1A

CR2, CR10, CR11,
CR12, CR13, CR19

6 DIODE, ZENER,

6.8V, 5%

CR2, CR17 2 DIODE, REFERENCE,

6.2V, 5%

CR4, CR5 2 RECT., SI, AX. LEADS,

3000V, 200MA

CR7 1 RECT., SI

100V 1.5A

CR9 1 DIODE, ZENER,

6.5V, 5%

CR14, 15, 16, 18,
22, 23

6 RECT., SWITCHING DIODE,

75V 0.4A

CR20, CR21 2 DIODE, ZENER,

5.6V, 5%

NOTE: REPLACEMENT PARTS MAY BE ORDERED FROM KEPCO, INC. ORDERS SHOULD INCLUDE KEPCO PART NUMBER AND DESCRIPTION.

PLEASE NOTE: THE MANUFACTURER'S NAME AND PART NUMBER LISTED FOR EACH ITEM ON REPLACEMENT PARTS LISTS REPRESENTS AT
LEAST ONE SOURCE FOR THAT ITEM AND IS LISTED SOLELY FOR THE CONVENIENCE OF KEPCO EQUIPMENT OWNERS IN OBTAINING
REPLACEMENT PARTS LOCALLY. WE RESERVE THE RIGHT TO USE EQUIVALENT ITEMS FROM ALTERNATE SOURCES. KEPCO, INC.

FAIRCHILD
W02G

MICROSEMI CORP.
1N5235BTR

ON SEMICONDUCTOR
1N821 TAPE/REEL

RECTRON, USA
R3000-F

DIOTEC ELECTRON
1N5392

AMERICAN POWER
1N763-1

AMERICAN POWER
1N4148-AMMO

AMERICAN POWER DEV.
1N752A

124-0346 1

121-0080 1

121-0041 1

124-0178 1

124-0133 1

121-0028 1

124-0437 1

121-0066 1

JQE 26956 SVC 08-1111 7-7

KEPCO REPLACEMENT PARTS LIST

JQE 150-1.5MVPY-26956 ASSEMBLY A1 (Figure 7-2) CODE: 2351431/2671532

REFERENCE

DESIGNATOR

QTY. DESCRIPTION

C1 1 CAP., ELECTROLYTIC, AX. LEADS,

220UF, 20%, 25V

C2 1 CAP., ELECTROLYTIC, AX. LEADS,

100UF, 20%, 50V

C3, C4 2 CAP., ELECTROLYTIC, AX. LEADS,

220UF, 20%, 16V

C5 1 CAP., MYLAR, METALLIZED,

0.1UF, 20%, 600V

C9 1 CAP., MYLAR, METALLIZED,

0.047UF, 10%, 200V

C10, C11 2 CAP., TANTALUM,

6.8UF, 20%, 35V

C12 1 CAP., CERAMIC,

0.005UF, + 80 -20%, 500V

C16-C23, C26, C27 10 CAP., CERAMIC,

0.1UF, 10%, 50V

MFRS. NAME & PART NO.

(SEE BOTTOM NOTE)

ILLINOIS CAPACITOR
227TTA025M

ILLINOIS CAPACITOR
107TTA050M

CORNELL DUBILIER
MALLORY #SKA221M016AT

AMERICAN SHIZUKI
X663F 0.1 20% 600VDC

SPRAGUE
192P5039

BC COMPONENTS
40MS685D035M0A

VISHAY CERA-MIT
5TSD50RE

VISHAY AMERICAS
A104K15X7R5-UAA

IC1 1 I.C., OPERATIONAL AMPLIFIER T.I.

UA741CP

IC2 1 I.C., DUAL PRECISION OP.AMP LINEAR TECH.

LT1013CN8

KEPCO

PART N O.

REC. SPARE

PART Q TY.

117-0713 1

117-0646 1

117-0512 1

117-0316 1

117-0362 1

117-0968 1

117-0061 1

117-1052 1

250-0025 1

250-0198 1

IC3, IC4, IC5 3 I.C., PRECISION SINGLE SUPPLY

OP.AMP

J1 1 JACK, SOCKET, POWER, CONNEC-

TOR, 2 PINS HEADER, PC MT

J2 1 JACK, SOCKET, CABLE CONNEC-

TOR, 5 PINS HEADER, PC MT

J3 1 JACK, SOCKET, CABLE CONNEC-

TOR, 4 PINS HEADER, PC MT

Q2 1 TRANSISTOR, SI, NPN, SMALL SIG-

NAL

Q3 1 TRANSISTOR, SI, NPN, SMALL SIG-

NAL

R3 1 RES., FIX., CARBON FILM,

620 OHM , 1W, 5%

R4, R19, R33 3 RES., VAR., MULTITURN, TRIM-

MER, 1 KOHM , 3/4W, 10%

R5 1 RES., FIX., CARBON FILM,

560 OHM , 1/4W, 5%

R7, R29 2 RES., FIX., PRECISION, METAL-

FILM, 750 OHM , 1/4W, 1%

PMI
OP-90GP

JST CORP.
B2B-XH-A

JST CORP.
B5B-XH-A

JST CORP.
B4B-XH-A

RAYTHEON MFG CO
1190094

MICROSEMI CORP.
2N3019

BOURNS INCORP
3009P-1-102

IRC, INC.
CF 1/4-561-J

IRC, INC.
GP 55 100 7500 F T&R

250-0216 1

143-0799 1

143-0811 1

143-0810 1

119-0094 1

119-0059 1

115-0496 1

115-2456 1

115-2210 1

115-2259 1

NOTE: REPLACEMENT PARTS MAY BE ORDERED FROM KEPCO, INC. ORDERS SHOULD INCLUDE KEPCO PART NUMBER AND DESCRIPTION.
PLEASE NOTE: THE MANUFACTURER'S NAME AND PART NUMBER LISTED FOR EACH ITEM ON REPLACEMENT PARTS LISTS REPRESENTS
AT LEAST ONE SOURCE FOR THAT ITEM AND IS LISTED SOLELY FOR THE CONVENIENCE OF KEPCO EQUIPMENT OWNERS IN OBTAINING
REPLACEMENT PARTS LOCALLY. WE RESERVE THE RIGHT TO USE EQUIVALENT ITEMS FROM ALTERNATE SOURCES. KEPCO, INC.

7-8 JQE 26956 SVC 08-1111

KEPCO REPLACEMENT PARTS LIST

JQE 150-1.5MVPY-26956 ASSEMBLY A1 (Figure 7-2) CODE: 2351431/2671532

REFERENCE

DESIGNATOR

QTY. DESCRIPTION

R9 1 RES., FIX., CARBON FILM,

220 OHM , 1/2W, 5%

R10 1 RES., FIX., PRECISION, METAL-

FILM, 82.5 KOHM , 1/4W, 1%

R11 1 RES., FIX., CARBON FILM,

3.9 KOHM , 1W, 5%

R12 1 RES., FIX., CARBON FILM,

1.5 KOHM , 1W, 5%

R13, R28 2 RES., FIX., CARBON FILM,

2.2 KOHM , 1/4W, 5%

R14 1 RES., VAR., MULTITURN, TRIM-

MER, 100 KOHM , 3/4W, 10%

R15 1 RES., FIX., PRECISION, METAL

FILM, 10 KOHM , 1/8W, 1%

R16 1 RES., VAR., MULTITURN, TRIM-

MER, 500 OHM , 3/4W, 10%

R20, R25, R27,
R58

4 RES., FIX., CARBON FILM,

10 OHM , 1/4W, 5%

R21 1 RES., FIX., CARBON FILM,

12 KOHM , 1/4W, 5%

MFRS. NAME & PART NO.

(SEE BOTTOM NOTE)

YAGEO
CF-50

VISHAY DALE
RN60D

OHMITE
OM3925A52

YAGEO
CFR-100 JTJ52 1K5

RCD COMPONENTS
CF25 2201 J TB

BOURNS INCORP
3009P-1-104

VISHAY DALE
CCF-55-1002-F-1/4W

BOURNS INCORP
3009P-1-501

IRC, INC.
CF 1/4-100-J

IRC
GBT 1/4

KEPCO

PART N O.

REC. SPARE

PART Q TY.

115-0470 1

115-2012 1

115-2122 1

115-0664 1

115-2382 1

115-2399 1

115-2174 1

115-2398 1

115-2230 1

115-2276 1

R22 1 RES., FIX., PRECISION, METAL

FILM, 301 OHM , 1/8W, 1%

R30, R31 2 RES., FIX., PRECISION, METAL

FILM, 43.2 KOHM , 1/8W, 1%

R32, R52 2 RES., FIX., PRECISION, METAL-

FILM, 511 OHM , 1/4W, 1%

R34 1 RES., FIX., PRECISION, METAL

FILM, 210 OHM , 1/8W, 1%

R37 1 RES., FIX., PRECISION, METAL

FILM, 5.62 KOHM , 1/8W, 1%

R38, R49 2 RES., FIX., PRECISION, METAL

FILM, 1.24 KOHM , 1/8W, 1%

R39, R40, R50,
R51

4 RES., FIX., PRECISION,

2.49 KOHM , 1/8W, 0.1%

R41, R48 2 RES., FIX., PRECISION, METAL

FILM, 100 OHM , 1/8W, 1%

R46 1 RES., FIX., PRECISION, METAL

FILM, 499 KOHM , 1/8W, 1%

R47 1 RES., FIX., PRECISION, METAL

FILM, 8.06 KOHM , 1/8W, 1%

NOTE: REPLACEMENT PARTS MAY BE ORDERED FROM KEPCO, INC. ORDERS SHOULD INCLUDE KEPCO PART NUMBER AND DESCRIPTION.

PLEASE NOTE: THE MANUFACTURER'S NAME AND PART NUMBER LISTED FOR EACH ITEM ON REPLACEMENT PARTS LISTS REPRESENTS AT
LEAST ONE SOURCE FOR THAT ITEM AND IS LISTED SOLELY FOR THE CONVENIENCE OF KEPCO EQUIPMENT OWNERS IN OBTAINING
REPLACEMENT PARTS LOCALLY. WE RESERVE THE RIGHT TO USE EQUIVALENT ITEMS FROM ALTERNATE SOURCES. KEPCO, INC.

IRC
CEA TYPE RN55D3010F

IRC
CEA RN55D4322F

RCD COMPONENTS
RCD GP55-5110-FTW

IRC
RN55D100F

VISHAY DALE
CCF555K62FKR36

VISHAY DALE
CCF-50 1241 F R36

VISHAY DALE
PTF-56 2K490 B T-13 R36

VISHAY DALE
CCF-55 1000 F R36

VISHAY DALE
CCF-55 4993 F R36

VISHAY DALE
CMF-55, 8061, F, T-0

115-2261 1

115-2380 1

115-2092 1

115-2177 1

115-2409 1

115-2507 1

115-2970 1

115-2598 1

115-2309 1

115-2445 1

JQE 26956 SVC 08-1111 7-9

KEPCO REPLACEMENT PARTS LIST

JQE 150-1.5MVPY-26956 ASSEMBLY A1 (Figure 7-2) CODE: 2351431/2671532

REFERENCE

DESIGNATOR

QTY. DESCRIPTION

R54 1 RES., VAR., MULTITURN, TRIM-

MER, COMP. OR CERM., 2 KOHM ,
3/4W, 10%

R56 1 RES., VAR., MULTITURN, TRIM-

MER, 10 KOHM , 3/4W, 10%

S1 1 SWITCH, PRINTED CIRCUIT,

DIP 4P DT 20VDC .4A

TP1-TP4, TP6-TP9 8 TEST POINT,

0.1” LEAD SPACING

MFRS. NAME & PART NO.

(SEE BOTTOM NOTE)

BOURNS INCORP
3009P-1-202

BOURNS INCORP
3009P-1-103

AUGAT ALCOSWITCH
ASE42RG

COMPONENTS CORP
ATP-402-10

KEPCO

PART N O.

REC. SPARE

PART Q TY.

115-2405 1

115-2481 1

127-0451 1

173-0029 1

NOTE: REPLACEMENT PARTS MAY BE ORDERED FROM KEPCO, INC. ORDERS SHOULD INCLUDE KEPCO PART NUMBER AND DESCRIPTION.
PLEASE NOTE: THE MANUFACTURER'S NAME AND PART NUMBER LISTED FOR EACH ITEM ON REPLACEMENT PARTS LISTS REPRESENTS
AT LEAST ONE SOURCE FOR THAT ITEM AND IS LISTED SOLELY FOR THE CONVENIENCE OF KEPCO EQUIPMENT OWNERS IN OBTAINING
REPLACEMENT PARTS LOCALLY. WE RESERVE THE RIGHT TO USE EQUIVALENT ITEMS FROM ALTERNATE SOURCES. KEPCO, INC.

7-10 JQE 26956 SVC 08-1111

KEPCO REPLACEMENT PARTS LIST

JQE 150-1.5MVPY-26956 ASSEMBLY A3 (Figure 7-3) CODE: 1130378

REFERENCE

DESIGNATOR

QTY. DESCRIPTION

MFRS. NAME & PART NO.

(SEE BOTTOM NOTE)

KEPCO

PART N O.

REC. SPARE

PART Q TY.

FIGURE 7-3. JQE 150-1.5MVPY-26956 A3 ASSEMBLY, COMPONENT LOCATIONS

Q301-Q312 12 TRANSISTOR, SI, NPN, POWER ON SEMICONDUCTOR

119-0091 1

2N3773

S301 1 SWITCH, THERMOSTAT (N.O.), SW-

THERMO SP ST

NOTE: REPLACEMENT PARTS MAY BE ORDERED FROM KEPCO, INC. ORDERS SHOULD INCLUDE KEPCO PART NUMBER AND DESCRIPTION.

PLEASE NOTE: THE MANUFACTURER'S NAME AND PART NUMBER LISTED FOR EACH ITEM ON REPLACEMENT PARTS LISTS REPRESENTS AT
LEAST ONE SOURCE FOR THAT ITEM AND IS LISTED SOLELY FOR THE CONVENIENCE OF KEPCO EQUIPMENT OWNERS IN OBTAINING
REPLACEMENT PARTS LOCALLY. WE RESERVE THE RIGHT TO USE EQUIVALENT ITEMS FROM ALTERNATE SOURCES. KEPCO, INC.

JQE 26956 SVC 08-1111 7-11

HONEYWELL/ELMWOOD
2450G-8081-0084

127-0248 1

KEPCO REPLACEMENT PARTS LIST

JQE 150-1.5MVPY-26956 ASSEMBLY A3A1 (Figure 7-4) CODE: 2361761

REFERENCE

DESIGNATOR

QTY. DESCRIPTION

MFRS. NAME & PART NO.

(SEE BOTTOM NOTE)

KEPCO

PART N O.

FIGURE 7-4. JQE 150-1.5MVPY-26956 A3A1 ASSEMBLY, COMPONENT LOCATIONS

REC. SPARE

PART Q TY.

R301-303, R306­308

6 RES., FIX., POWER, AX. LEADS,

1 OHM , 3W, 5%

R311, R312 2 RES., FIX., CARBON FILM,

120 OHM , 1/2W, 5%

VISHAY DALE ELE
CW02B1R000JS70

IRC
GBT-1/2

115-0499 1

115 -1136 1

NOTE: REPLACEMENT PARTS MAY BE ORDERED FROM KEPCO, INC. ORDERS SHOULD INCLUDE KEPCO PART NUMBER AND DESCRIPTION.
PLEASE NOTE: THE MANUFACTURER'S NAME AND PART NUMBER LISTED FOR EACH ITEM ON REPLACEMENT PARTS LISTS REPRESENTS
AT LEAST ONE SOURCE FOR THAT ITEM AND IS LISTED SOLELY FOR THE CONVENIENCE OF KEPCO EQUIPMENT OWNERS IN OBTAINING
REPLACEMENT PARTS LOCALLY. WE RESERVE THE RIGHT TO USE EQUIVALENT ITEMS FROM ALTERNATE SOURCES. KEPCO, INC.

7-12 JQE 26956 SVC 08-1111

KEPCO REPLACEMENT PARTS LIST

JQE 150-1.5MVPY-26956 ASSEMBLY A3A2 (Figure 7-5) CODE: 2361762

REFERENCE

DESIGNATOR

QTY. DESCRIPTION

MFRS. NAME & PART NO.

(SEE BOTTOM NOTE)

KEPCO

PART N O.

FIGURE 7-5. JQE 150-1.5MVPY-26956 A3A2 ASSEMBLY, COMPONENT LOCATIONS

REC. SPARE

PART Q TY.

CR301 1 DIODE, ZENER,

5.6V, 5%

CR302 1 RECT., SWITCHING DIODE,

75V 0.4A

C301 1 CAP., MYLAR FILM,

500PF, 10%, 200V

C302 1 CAP., MYLAR FILM,

6800PF, 10%, 200V

R304, R305, R309,
R310

4 RES., FIX., POWER, AX. LEADS,

1 OHM , 3W, 5%

R313, R314 2 RES., FIX., POWER, AX. LEADS,

6.8 KOHM , 3W, 5%

R315 1 RES., FIX., CARBON FILM,

330 OHM , 1/2W, 5%

R316 1 RES., FIX., POWER, AX. LEADS,

8 KOHM , 3W, 3%

R319 1 RES., FIX., CARBON FILM, 330

OHM , 1/4W, 5%

NOTE: REPLACEMENT PARTS MAY BE ORDERED FROM KEPCO, INC. ORDERS SHOULD INCLUDE KEPCO PART NUMBER AND DESCRIPTION.

PLEASE NOTE: THE MANUFACTURER'S NAME AND PART NUMBER LISTED FOR EACH ITEM ON REPLACEMENT PARTS LISTS REPRESENTS AT
LEAST ONE SOURCE FOR THAT ITEM AND IS LISTED SOLELY FOR THE CONVENIENCE OF KEPCO EQUIPMENT OWNERS IN OBTAINING
REPLACEMENT PARTS LOCALLY. WE RESERVE THE RIGHT TO USE EQUIVALENT ITEMS FROM ALTERNATE SOURCES. KEPCO, INC.

AMERICAN POWER DEV
1N752A

AMERICAN POWER
1N4148-AMMO

CORNELL DUBILIE
WMC2D15K

AMERICAN SHIZUK
663 0.0068 +/-10% 200VDC

VISHAY DALE
CW02B1R000JS70

VISHAY DALE
CW-2B 6.8K 5% B12

YAGEO
CFR-50JTJ52330R

VISHAY DALE
CW-2B-8000OHM-3%

IRC, INC.
CF 1/4-331-J

121-0066 1

124-0437 1

117-0950 1

117-0552 1

115-0499 1

115-1284 1

115-0804 1

115-1652 1

115-2233 1

JQE 26956 SVC 08-1111 7-13

KEPCO REPLACEMENT PARTS LIST

JQE 150-1.5MVPY-26956 ASSEMBLY A4 (Figure 7-6) CODE: 2362737

REFERENCE

DESIGNATOR

QTY. DESCRIPTION

MFRS. NAME & PART NO.

(SEE BOTTOM NOTE)

DETAIL "A"

KEPCO

PART N O.

REC. SPARE

PART Q TY.

FIGURE 7-6. JQE 150-1.5-26956 A4 ASSEMBLY, COMPONENT LOCATIONS

CR1 1 RECT., ENCAPSULATED BRIDGE,

200V 1A

CR3 1 DIODE, ZENER,

15V, 5%

CR4, CR6 2 DIODE, ZENER,

4.7V, 5%

CR10 1 DIODE, ZENER,

6.5V, 5%

CR9, CR11, CR12,
CR13

4 RECT., SI RECTIFIER,

SCHOTTKY, AX. LDS. 40V, 1A

CR14 1 DIODE, CURRENT REGULATOR,

1N5297, 100 V, 0.6A

CR402 1 RECT., THYRISTOR (SCR),

200V, 8A

NOTE: REPLACEMENT PARTS MAY BE ORDERED FROM KEPCO, INC. ORDERS SHOULD INCLUDE KEPCO PART NUMBER AND DESCRIPTION.
PLEASE NOTE: THE MANUFACTURER'S NAME AND PART NUMBER LISTED FOR EACH ITEM ON REPLACEMENT PARTS LISTS REPRESENTS
AT LEAST ONE SOURCE FOR THAT ITEM AND IS LISTED SOLELY FOR THE CONVENIENCE OF KEPCO EQUIPMENT OWNERS IN OBTAINING
REPLACEMENT PARTS LOCALLY. WE RESERVE THE RIGHT TO USE EQUIVALENT ITEMS FROM ALTERNATE SOURCES. KEPCO, INC.

FAIRCHILD
W02G

AMERICAN POWER
1N4744A

PHILIPS SEMICON
1N4732A

AMERICAN POWER
1N763-1

ON SEMICONDUCTOR
1N5819RLG

CENTRAL SEMICON
CCL0750

CENTRAL SEMICON
CS220-8B

124-0346 1

121-0057 1

121-0091 1

121-0028 1

124-0578 1

121-0083 1

124-0350 1

7-14 SVC08-1111

KEPCO REPLACEMENT PARTS LIST

JQE 150-1.5MVPY-26956 ASSEMBLY A4 (Figure 7-6) CODE: 2362737

REFERENCE

DESIGNATOR

QTY. DESCRIPTION

CR5, CR7, CR8 3 RECT., SWITCHING DIODE,

75V, 0.4A

CR9 1 RECT., SI RECTIFIER,

AX. LEADS, 3000V, 200MA

C1 1 CAP., ELECTROLYTIC, AX. LEADS,

140UF, +100 -10%, 40V

C2, C4, C5, C7, C8,
C10, C11,

7 CAP., CERAMIC,

0.1UF, 10%, 50V

C12 1 CAP., TANTALUM,

4.7UF, 10%, 15V

C13 1 CAP., CERAMIC,

1000PF, 10%, 200V

C3 1 CAP., CERAMIC,

0.047UF, 10%, 50V

C6, C9 2 CAP., CERAMIC,

0.01UF, 10%, 50V

IC1 1 I.C. ADJ. REFERENCE

(2.5-37V) 600UA-100MA ,

IC2 1 I.C. PRECISION SINGLE SUPPLY

OP.AMP

MFRS. NAME & PART NO.

(SEE BOTTOM NOTE)

AMERICAN POWER
1N4148-AMMO

RECTRON, USA
R3000-F

SANGAMO COMPONE
052FE141Q040B

VISHAY AMERICAS
A104K15X7R5-UAA

SPRAGUE CAPACIT
173D475X9015VW

VISHAY BC COMPO
A102K15X7RK5-UAA

BC COMPONENTS (
A473K17X7RFVVWJ

VISHAY BC COMPO
A103K15X7RF5-UAA

MOT.
TL431AILP

PMI
OP-90GP

KEPCO

PART N O.

REC. SPARE

PART Q TY.

124-0437 1

124-0178 1

117-0706 1

117-1052 1

117-1112 1

117-1084 1

117-1054 1

117-1053 1

250-0239 1

250-0216 1

IC3 1 I.C. DUAL VOLTAGE COMPARATOR

OP.AMP.

IC4 1 I.C. PRECISION INSTRUMENTATION

AMPLIFIER

IC5 1 I.C. LOW INPUT OFFSET VOLTAGE

OP. AMP

J1 1 JACK, SOCKET, POWER, CONNEC-

TOR, 2 PINS HEADER, PC MT

J2 1 JACK, SOCKET, POWER, CONNEC-

TOR, 3 PINS HEADER, PC MT

J3, J4 2 JACK, QUICK CONNECT (MALE),

PC MOUNT

PCB 1 PCB ASSY, REV#1 KEPCO

NAT.
LM393AN

BURR-BROWN
INA118P

PRECISN MONO
OP-07CP

JST CORP.
B2B-XH-A

JST CORP.
B3B-XH-A

ZIERICK MIDWEST
82237-21

250-0228 1

250-0332 1

250-0146 1

143-0799 1

143-0800 1

107-0362 1

167-1541 1

167-1541

Q1 1 TRANSISTOR, SI, NPN, SMALL SIG-

NAL

RC403, R415,
R432

3 RES., VAR., MULTITURN, TRIM-

MER, COMP. OR CERM., 10 KOHM ,

RAYTHEON MFG CO
1190094

BOURNS INCORPOR
3009P-1-103

119-0094 1

115-2481 1

3/4W, 10%

NOTE: REPLACEMENT PARTS MAY BE ORDERED FROM KEPCO, INC. ORDERS SHOULD INCLUDE KEPCO PART NUMBER AND DESCRIPTION.

PLEASE NOTE: THE MANUFACTURER'S NAME AND PART NUMBER LISTED FOR EACH ITEM ON REPLACEMENT PARTS LISTS REPRESENTS AT
LEAST ONE SOURCE FOR THAT ITEM AND IS LISTED SOLELY FOR THE CONVENIENCE OF KEPCO EQUIPMENT OWNERS IN OBTAINING
REPLACEMENT PARTS LOCALLY. WE RESERVE THE RIGHT TO USE EQUIVALENT ITEMS FROM ALTERNATE SOURCES. KEPCO, INC.

SV C08- 1111 7-15

KEPCO REPLACEMENT PARTS LIST

JQE 150-1.5MVPY-26956 ASSEMBLY A4 (Figure 7-6) CODE: 2362737

REFERENCE

DESIGNATOR

QTY. DESCRIPTION

RN2A/ RN2B 2 RES, NET, RATIO 30:1

RN2A: 150K/RN2B: 4.99K

R1 1 RES., FIX., CARBON FILM,

330 OHM , 2W, 5%

R2 1 RES., FIX., CARBON FILM,

510 OHM , 1/2W, 5%

R3 1 RES., FIX., PRECISION, METAL-

FILM, 4.02 KOHM , 1/4W, 1%

R4 1 RES., FIX., POWER, AX. LEADS,

0.5 OHM , 3W, 3%

R5, R8 2 RES., FIX., CARBON FILM,

1 KOHM , 1/4W, 5%

R6 1 RES., FIX., PRECISION,

2.49 KOHM , 1/8W, 0.1%

R7 1 RES., FIX., CARBON FILM,

10 OHM , 1/4W, 5%

R9 1 RES., FIX., PRECISION, METAL

FILM, 49.9 KOHM , 1/8W, 1%

R10 1 RES., FIX., PRECISION, METAL-

FILM, 7.5 KOHM , 1/4W, 1%

MFRS. NAME & PART NO.

(SEE BOTTOM NOTE)

PRECISION RESIS
PR9162

RCD COMPONENTS
CF200S 3300 J TB

KOA/SPEER
CF1/2 511 J T52A

VISHAY DALE
CCF554K02FKE36

VISHAY DALE
CW02BR5000HS70

IRC, INC.
CF-1/4 102 J T&R

VISHAY DALE
PTF-56 2K490 B T-13 R36

IRC, INC.
CF 1/4-100-J

VISHAY DALE
CMF5549K900FEEA

IRC
CES RN60D7501F

KEPCO

PART N O.

REC. SPARE

PART Q TY.

234-0038 1

115-0882 1

115-0824 1

115-3021 1

115-1880 1

115-2238 1

115-2970 1

115-2230 1

115-2755 1

115-1853 1

R11, R26, R27,
R28, R29

5 RES., FIX., PRECISION, METAL

FILM, 4.99 KOHM , 1/8W, 1%

R12, R13, R22 3 RES., FIX., PRECISION, METAL

FILM, 1 KOHM , 1/4W, 1%

R15 1 RES., FIX., PRECISION, METAL

FILM, 15 KOHM , 1/8W, 1%

R16 1 RES., FIX., CARBON FILM,

100 OHM , 1/4W, 5%

R19 1 RES., FIX., PRECISION, METAL-

FILM, 150 OHM , 1/4W, 1%

R20 1 RES., FIX., PRECISION, METAL

FILM, 2 KOHM , 1/8W, 1%

R23, R25, R31 3 RES., FIX., PRECISION, METAL

FILM, 10 KOHM , 1/8W, 1%

R24 1 RES., FIX., POWER, SHUNT (4

TERMINAL), 0.01 OHM , 3W, 1%

R33 1 RES., FIX., CARBON FILM,

2.2 KOHM , 1/4W, 5%

R34, R35, R36,
R37

4 RES., FIX., METAL FILM,

100 KOHM , 1/8W, 0.1%

VISHAY DALE
CFF-55 4991 F R36

VISHAY DALE
CCF-55-1001-F-R36

IRC, INC.
GP55 100 1502 F T&R

IRC, INC.
CF 1/4 101 J T&R

VISHAY DALE
CCF-55

VISHAY DALE
CCF-55 2001 F R36

VISHAY DALE
CCF-55-1002-F-1/4W

ISOTEK CORP
PBV-R010-1.0

RCD COMPONENTS
CF25 2201 J TB

VISHAY DALE
CMF-55 1003 B T-9 R36

115-2401 1

115-2180 1

115-2452 1

115-2231 1

115-2091 1

115-2334 1

115-2174 1

115-3046 1

115-2382 1

115-2864 1

NOTE: REPLACEMENT PARTS MAY BE ORDERED FROM KEPCO, INC. ORDERS SHOULD INCLUDE KEPCO PART NUMBER AND DESCRIPTION.
PLEASE NOTE: THE MANUFACTURER'S NAME AND PART NUMBER LISTED FOR EACH ITEM ON REPLACEMENT PARTS LISTS REPRESENTS
AT LEAST ONE SOURCE FOR THAT ITEM AND IS LISTED SOLELY FOR THE CONVENIENCE OF KEPCO EQUIPMENT OWNERS IN OBTAINING
REPLACEMENT PARTS LOCALLY. WE RESERVE THE RIGHT TO USE EQUIVALENT ITEMS FROM ALTERNATE SOURCES. KEPCO, INC.

7-16 SVC08-1111

KEPCO REPLACEMENT PARTS LIST

JQE 150-1.5MVPY-26956 ASSEMBLY A4 (Figure 7-6) CODE: 2362737

REFERENCE

DESIGNATOR

QTY. DESCRIPTION

R430 1 RES., VAR., MULTITURN, TRIM-

MER, COMP. OR CERM., 500 OHM ,

MFRS. NAME & PART NO.

(SEE BOTTOM NOTE)

BOURNS INCORP
3009P-1-501

3/4W, 10%

TP1-TP7 7 TEST POINT, 0.1” LEAD SPACING COMPONENTS CORP

ATP-402-10

fi

KEPCO

PART N O.

REC. SPARE

PART Q TY.

115-2398 1

173-0029 1

NOTE: REPLACEMENT PARTS MAY BE ORDERED FROM KEPCO, INC. ORDERS SHOULD INCLUDE KEPCO PART NUMBER AND DESCRIPTION.

PLEASE NOTE: THE MANUFACTURER'S NAME AND PART NUMBER LISTED FOR EACH ITEM ON REPLACEMENT PARTS LISTS REPRESENTS AT
LEAST ONE SOURCE FOR THAT ITEM AND IS LISTED SOLELY FOR THE CONVENIENCE OF KEPCO EQUIPMENT OWNERS IN OBTAINING
REPLACEMENT PARTS LOCALLY. WE RESERVE THE RIGHT TO USE EQUIVALENT ITEMS FROM ALTERNATE SOURCES. KEPCO, INC.

SV C08- 1111 7-17

KEPCO REPLACEMENT PARTS LIST

JQE 150-1.5MVPY-26956 ASSEMBLY A5 (Figure 7-7) CODE: 2362735

REFERENCE

DESIGNATOR

QTY. DESCRIPTION

MFRS. NAME & PART NO.

(SEE BOTTOM NOTE)

KEPCO

PART N O.

REC. SPARE

PART Q TY.

FIGURE 7-7. JQE 150-1.5MVPY-26956 A5 ASSEMBLY, COMPONENT LOCATIONS

NOTE: REPLACEMENT PARTS MAY BE ORDERED FROM KEPCO, INC. ORDERS SHOULD INCLUDE KEPCO PART NUMBER AND DESCRIPTION.
PLEASE NOTE: THE MANUFACTURER'S NAME AND PART NUMBER LISTED FOR EACH ITEM ON REPLACEMENT PARTS LISTS REPRESENTS
AT LEAST ONE SOURCE FOR THAT ITEM AND IS LISTED SOLELY FOR THE CONVENIENCE OF KEPCO EQUIPMENT OWNERS IN OBTAINING
REPLACEMENT PARTS LOCALLY. WE RESERVE THE RIGHT TO USE EQUIVALENT ITEMS FROM ALTERNATE SOURCES. KEPCO, INC.

7-18 JQE 26956 SVC 08-1111

KEPCO REPLACEMENT PARTS LIST

JQE 150-1.5MVPY-26956 ASSEMBLY A5 (Figure 7-7) CODE: 2362735

REFERENCE

DESIGNATOR

QTY. DESCRIPTION

CR1 1 RECT., SI RECTIFIER,

400V 5 A 50A300A

CR203 1 RECT., THYRISTOR (SCR),

300V 16A

J1 1 JACK, SOCKET, POWER, CONNEC-

TOR, 3 PINS HEADER, PC MT

J2 1 JACK, SOCKET, POWER, CONNEC-

TOR, 2 PINS HEADER, PC MT

J4, J5, J6, J7, J9,
J12

6 JACK, QUICK CONNECT (MALE),

PC MOUNT

J10, J11 2 JACK, QUICK CONNECT (MALE),

PC MT., VERTICAL

TB501 1 TERMINAL BLOCK,

STRIP, PC MT, 8 CKTS

TB502, TB503 2 TERMINAL BLOCK,

STRIP, PC MT, 3 CKTS

MFRS. NAME & PART NO.

(SEE BOTTOM NOTE)

DIOTEC ELECTRONICS
GP604

INTERNATIONAL RECT.
IRC30C

JST CORP.
B3B-XH-A

JST CORP.
B2B-XH-A

ZIERICK MIDWEST
82237-21

ZIERICK MIDWEST
K22053-22

CURTIS INDUSTRIES
SEIPX08

CURTIS INDUSTRIES
SEIPX03

KEPCO

PART N O.

REC. SPARE

PART Q TY.

124-0348 1

124-0277 1

143-0800 1

143-0799 1

107-0362 1

107-0384 1

167-1537 1

167-1538 1

NOTE: REPLACEMENT PARTS MAY BE ORDERED FROM KEPCO, INC. ORDERS SHOULD INCLUDE KEPCO PART NUMBER AND DESCRIPTION.

PLEASE NOTE: THE MANUFACTURER'S NAME AND PART NUMBER LISTED FOR EACH ITEM ON REPLACEMENT PARTS LISTS REPRESENTS AT
LEAST ONE SOURCE FOR THAT ITEM AND IS LISTED SOLELY FOR THE CONVENIENCE OF KEPCO EQUIPMENT OWNERS IN OBTAINING
REPLACEMENT PARTS LOCALLY. WE RESERVE THE RIGHT TO USE EQUIVALENT ITEMS FROM ALTERNATE SOURCES. KEPCO, INC.

JQE 26956 SVC 08-1111 7-19(7-20 Blank)

NOTES:

1) Resistor values in "ohms" and Capacitor values in
"microfarads", unless otherwise specified.

2) Consult Parts List for the components marked with
"*" symbol.

3) TB502 link between pin 1 & 2 (factory default)
enables the Current Limit Control "B". Remove the
link to disable it.

4) TB501 links between pin 1 & 2 and between pin 4 &
5 (factory default) set the PS in local error
sensing. Remove the links for remote error sensing
(=Kelvin connection).
TB501 link between pin 6 & 7 (factory default)
enables the Front Panel Voltage Control, together
with the A1-S1 set to LOC position. Remove the link
to enable a Remote Resistive Voltage Control,
together with A1-S1 set to REM position.

A2-TB202

1

2

3

4

5

FAN

AC LINE LAMP
(FRONT PANEL)

A2-B201

AC FAN

FP-DS101

A2-R201

7.5

A2- CHASSIS LEVEL

FP- FRONT PANEL LEVEL

BP- BACK PANEL LEVEL

PROPRIETARY DATA
©2008, KEPCO, INC

FP-CB101

L

N

3020864

AC INPUT CORD
(BACK PANEL)

H

GND

N

CHASSIS

A2-TB201

A

B

A1

A2 B2

CIRCUIT BREAKER
(FRONT PANEL)

FP- CURRENT
LIMIT "B"
CTRL

FP-R103
500

A2-T202

AUX.TRANSFORMER

*

A2-T201

TB1 @T201

1T

2T

3T

4T

5T

6T

7T

MAIN POWER
TRANSFORMER

MAIN RECTIFIER

*

A2-C205

*

A2-R202

*

A2-CR201

*

A2-C206

*

A2-C207

*

A2-CR202

+

*

A2-C201

MAIN FILTER

CD

A3-S301

HEAT SINK
THERMO-SWITCH HS_DRV

B1

C2

D2

J208

101112

R306-308

1.0

R312 120

12

Q301-303

A3A1-P301

RAW_DC

** *

Q306-308

R301-303

1.0

R311 120

123456789

1234567891011

R316
8K

SUB-ASSY #1 SUB-ASSY #2

RET_RES

2

101112

12

CC_RS

Q304/305

Q311

R317 MJ

R319 330

R313 6.8K

13-CW

A1

-CMON
+CMON(=RETURN)
R103/CW & WP
R103/CCW

DRV_AC1
DRV_AC2
RS_AC1
RS_AC2
CTRL_AC1
CTRL_AC2

RET_RES
CC_RS
+VDRV
+VRS
VDRV_RT
HS_DRV

*

FP-M101

FP-AMMETER

CURRENT SENSING
RESISTOR

-OUT_MON
+SENSE_RES

CURR_CTRL_WP

CHASSIS_GND
+OUT_MON

-SENSING

NULL

+SENSING

CURR_CTRL_CW

-SENSE_RES

+VRS

-VRS

A1-P3

J204

J203

AMPLIFIER & REFERENCE
BOARD

J3

1

1
2

2

3

3

4

4

P3

1

1

2

2

3

3

4

4

5

5

6

6

P2

1

1

2

2

3

3

4

4

5

5

6

6

12

J202

123456789

1234567891011

A3A2-P302

+HS_OUT

R304/305

*

1.0

*

C301

0.0015

C302

0.0068

R314 6.8K

Q309/310

*

Q312

CR302

R309/310

1.0

R315 330

CR301 5.6V

PASS-ELEMENT ASSY

FP- CURRENT
LIMIT "A" CTRL

*

FP-R101

J2

REF

1

RPC1

2

RPC2

3
4

RETURN

5

P5

RETURN

Rr_1
Rr_2

x1(+) C(-)

1
2
3
4
5
6

Er

7
8
9

P4

1
2
3
4
5
6
7
8
9
10
11
12

J1

1
2

A

*

A2-R203

A3

10
11
12

A1-P2

1
2
3
4
5

J205

1
2
3
4
5
6
7
8
9

1
2
3
4
5
6
7
8
9

A1-P1

1
2

2

J206

13-CW

FP- VOLTAGE
CTRL

2

OUTPUT
CAPACITOR

1

CHASSIS
GND

1

CHASSIS
GND

V

13-CW

A2-C204

x1(+)C(-)

*

FP-R102

A5-P9

A5-P11

A5-P10

A5-P1

J201

A5-P6

+

A5-P4

A5-P7

A5-P12

A5-P5

A5-P31J3

A5-P2

A4-P2

A4-P1

J207

A4-P4

A4-P3

*

FP-M102

FP-VOLTMETER

OUTPUT CROWBAR

*

CR203

REF
RCP1
RCP2

-S

-V

+V
+S

NULL
RVC

-OUT

+OUT

+C_MON

-C_MON

+C_MON

-C_MON

+VRS

-VRS

AC1_OVP
AC2_OVP
CR203_G
CR203_K

-SENSING
+SENSING

-OUT

-OUT_INT

1

J8

A5

OUTPUT TERMINALS
BOARD

REF
RPC1
RPC2

-S

-V

CHASSIS-GND

+V
+S
RVC
RPV1
RPV2

+C_MON

-C_MON

A4

OVP & C.MON
BOARD

BACK PANEL

TB502

1
2
3

SEE NOTE 3

TB501

1
2
3
4
5
6
7
8

SEE NOTE 4

1

1
2
3

REMOTE CURRENT
CONTROL (B)
TERMINAL BLOCK

OUTPUT TERMINALS
& REMOTE VOLTAGE
CONTROL TERMINAL
BLOCK

CHASSIS
GND
STUD

TB503

CURRENT MONITOR
TERMINAL BLOCK

PROPRIETARY DATA
©2008, KEPCO, INC

J9

1

1

J11

CR203_G

1

1

J10

1

1

J1

1

1

2

2

3

3

P501

1

1

2

2

3

3

4

4

5

5

6

6

7

7

8

8

9

9

J6

-SENSING

1

1

J4

+SENSING

1

1

J7

1

1

J12

1

1

J5

1

1

1

J2

1

1

2

2

J2

1

1

2

2

3

3

J1

1

1

2

2

P401

1

1

2

2

3

3

4

4

5

5

6

6

J4

1

1

J3

1

1

FIGURE 7-8. JQE 150-1.5MVPY-26956,

OVERALL SCHEMATIC DIAGRAM

JQE 26956 SVC 081111 6-21

7-21/7-22

7-20/7-21

J1

+VRS

1

P3-@ J203

-VRS

2

RETURN
AUX. PS

2

~

~

4

3

CR6
200V/1A

CONTROL
AUX. PSs

3

CR8
200V/1A

+-

2

~

~

4

2

~

~

4

1

HS DRIVER
AUX. PS

1

+-

1

+-

+

+

C1
220

*

*

C7

+

R23

*

CR19

6.8V

C2
100

CR9 6.5V

R9 220

3

CR1
200V/1A

DRV_AC1

1

DRV_AC2

2

RS_AC1

3

RS_AC2

4

CTRL_AC1

5

CTRL_AC2

6

R10

82.5K

*

*

R2

R1

HS DRIVER

Q2

1190094

R5

2

560

R11

3.9K

3 2

Q3 2N3019

R12 1.5K

C12 0.005

CR2

6.8V

13

1

R3
620

CR7
SI-1

R27 10

PS

R24

*

*

C13

1

*

Q1

CR10

6.8V

CR11

6.8V

CR12

6.8V

CR13

6.8V

TO A4-J1 CC RETURN

TO T202

PROPRIETARY DATA
©2008, KEPCO, INC

NOTES:

1) Resistor values in "ohms" and Capacitor values
in "microfarads", unless otherwise specified.

2) Components marked with "*" are model dependent,
or are not always used. Consult Parts List for details.

3) TB1 and TB2 are installed for the special models with
"I_LIM_B" feature.

4) TP3 is installed for units w/o separate calibration
for remote voltage control (S1, R33, R37 not present).

5) TP4 is installed for current loop referenced to (+)Sensing,
while TP5 is installed for current loop referenced to (-)Sens.
Resistor.

3020853

3

2

R28

2.2K

R13

2.2K

R20 10

R58 10

+13.5V

-13.5V

+

+

RET_RES
CC_RS
+VDRV
+VRS
VDRV_RT
HS_DRV

2
1

TP9

R7 750

C10

6.8

C11

6.8

R29 750

P2-@ J204

1
2

TO

3

PASS-ELEMENT

4
5
6

R21
12K

+6.2V

CR3

6.2V

CR17

6.2V

-6.2V

TP8

2
1

VOLTAGE ERROR
AMPLIFIER

TP6

1

2

CR15
1N4148

2

*

C9

0.047

CURRENT ERROR
AMPLIFIER

TP7

1

2

CR14
1N4148

*

R17

*

C8

CURRENT ERROR
AMPLIFIER (B)

CR22

R48

1N4148

100

*

R18

*

C15

R22
301

*

R16
500

VOLTAGE MODE

1 3-CW

LAG COMP.

R41
100

C24

*

C22

0.1u

C23

0.1u

C25

*

C16

0.1u

C17

0.1u

C18

0.1u

C19

0.1u

+13.5V

-13.5V

+13.5V

-13.5V

C14

*

+13.5V

-13.5V

IC4
LT1006

7

1

IC1
LM741 3

+

6

-

4

5

VOLTAGE MODE
OFFSET ADJ

IC3
LT1006

7

8

+

6

-

451

7

8

3

+

6

2

-

451

R56 10K

CURRENT MODE
OFFSET ADJ (B)

GND
NETWORK

R25 10

*

CR24

CR16
1N4148

CR18
1N4148

R38

1.24K

2

R34
210

3

2

2

R32
511

R15

**

TP4

R49

1.24K

R14
100K

10K

13-CW

2

1

2

R39 2.49K

*

R40

R51 2.49K

R50 2.49K

13-CW

R37 5.62K

R30

*

*

R31

TP5

1

2

-SENSE_RES

C5

0.1

+6.2V

-6.2V

*

R55

C4

220

C20

0.1u

C21

0.1u

CR23
1N4148

**

IC2B
LT1013

+

R33

1K

13-CW

2

Ib ADJ
(for Rem- FS
Voltage Adj)

+13.5V

IC2A
LT1013

1

-13.5V

+6.2V

84

5

+

7

6

-

+13.5V

C26

0.1u

C27

0.1u

-13.5V

R57

*

C3
220

+

CR4
1240178

CR5
1240178

*

1

TP2

2

R8

*

CURRENT SENSING
AMPLIFIER

84

3

+

2

-

*

R43

R6

*

R46 499K

CURRENT
REFERENCE(A)

IC5
LT1006

7

8

3

+

6

2

-

451

CURRENT
REFERENCE(B)

+6.2V

C6

*

R4

1K

13-CW

2

Ib ADJ
(for FP- FS
Voltage Adj)

R42

*

R44

*

R45

*

FS Current
Adj (A)

R19 2K

13-CW

2

*

R47

CR21

CR20

5.6V

5.6V

R52 511

(=R103/CCW)

RPC2

(=R103/CW & WP)

RPC1

+CMON(=RETURN)

-CMON

*

TP3

*

S1

2

5

VOLTAGE CONTROL

8

SWITCH

11

P5-@ J205

TO

1
2

BACK PANEL OUTPUT

3

TERMINALS-TB501

4

TO

5
6

CURRENT SENSING

7

RESISTOR

8

TO

9

FP CURRENT
CTRL (A)

P4- @J206

TO

1
2

BACK PANEL OUTPUT

3

TERMINALS-TB501

4

TO

5
6

CURRENT SENSING

7

RESISTOR

8

TO

9
10

FP VOLTAGE CTRL &

11

CURRENT CTRL (A) &

12

Eout/Iout METERS

+SENSE_RES

CURR_CTRL_WP

CHASSIS_GND
+OUT_MON

*

1

TP1

2

CURR_CTRL_CW

-SENSE_RES

"Remote"

"Local-Front Panel"

RETURN

-OUT_MON

Er

-SENSING

NULL

+SENSING

Rr_1
Rr_2

1
2

3

1
6

4
7

9

10

12

RETURN

-SENSE_RES

+SENSE_RES

CURR_CTRL_CW

PROPRIETARY DATA

CURR_CTRL_WP

-6.2V

*

R53

FS CURRENT
ADJ (B)

2

13-CW

R54 2K

RETURN

RPC2
RPC1

REF

J3

TO

*

4

FRONT PANEL CURRENT

3

CTRL (B)- R103

2

TO

1

CURRENT MONITORING
CIRCUITRY (@ +OUT POTENTIAL)

©2008, KEPCO, INC

J2

5

TO

4

A5-J1

3
2
1

FIGURE 7-9. A1, AMPLIFIER AND REFERENCE

BOARD A1, SCHEMATIC DIAGRAM

JQE 26956 SVC 081111 6-23

7-23/7-24

7-22/7-23

TO T201

TO CB101

TO CR203

TO J206

P401-@ J207

1
2
3
4
5
6

AC1_OVP
AC2_OVP
CR203_G
CR203_K

-SENSING
+SENSING

R8
1K

3

CR1
200V/1A

C3

0.047

R1
330

2

C1
140

CR402
200V/8A

R4

0.5

3

1 2

C2

0.1

GATE

R5
1K

~

1

+-

~

4

+

+15V

CR3
15V

R2
510

C12

4.7

+6.5V

R3

4.02K

IC1

+

TL431

1

2 3

R6

2.49K

OVP CIRCUIT

NOTES:

1) Resistor values in "ohms" and Capacitor values
in "microfarads", unless otherwise specified.

2) Components/ circuits marked with "*" are model dependent,

CR4

4.7V

R7
10

TP1

2
1

LOC_RET

or are not always used. Consult Parts List for details.

3) TP8 is installed for regular JQE units, w/o the
current monitoring circuit.

PROPRIETARY DATA
©2008, KEPCO, INC

TO C201-202/MINUS

TO A5-J7

PROPRIETARY DATA
©2008, KEPCO, INC

Q1

R15
15K

2N2219A

1

CR6

4.7V

2

R16

3

100

GATE

*

TP8

C13

3

+

2

-

TP2

2
1

LOC_RET

0.001

84

IC3A
LM393

C5

0.1

+15V+15V +15V

C6

0.01

+6.5V

CR13
1N5819

R20 2K

+6.5V

R12

1

CR14
1N5297

1K

RN2

*

A

B

2
1

CR12

1N5819

R34 100K

R36 100K

CR5
1N4148

+15V

R35
100K

IC2

LT1006

+6.5V

R37
100K

R11

4.99K

LOC_RET

R19 150

TP5

1

2

+15V

7

8

3

+

2

-

451

R415
10K

6

C4

0.1

2

13-CW

TP3

C9

0.01
LOC_RET

1

2

R13
1K

2

TP4

R(C)403
10K

13-CW

1

2

R22 1K

R9 49.9K

84

IC3B
LM393

5

+

6

-

7

LOC_RET

R10

7.5K

"OVP DELAY ADJ""OVP LEVEL ADJ"

J3

-OUT_INT

1

R24

0.01

J4

-OUT

1

LOC_RET

R23 10K

R25 10K

CR7
1N4148

CR8
1N4148

IC4
INA118

3

2

R31
10K

7

+

-

485

+6.5V

1

6

2

C7

0.1

LOC_RET

C8

0.1

-6.5V

R432
10K

13-CW

TP6

1

IC5
OP07

2

7

1

3

6

+

2

-

4

8

* CURRENT MONITORING CIRCUIT AT "-OUT" POTENTIAL

(INSTALLED/USED FOR SPECIALS ONLY)

+C_MON

R27

4.99K

-C_MON

+6.5V

C10

0.1

LOC_RET

C11

0.1

-6.5V

LOC_RET

+6.5V -6.5V

4.99K

CR9 1N5819 CR11 1N5819R26

R430
500

2

13-CW

R28 4.99K R29 4.99K

"C_MON ZERO ADJ""C_MON FS ADJ"

J2

1
2
3

TO A5-J2

TP7

1

J1

TO A1- J1

1
2

+VRS=-OUT_INT

-VRS

3020855

JQE 26956 SVC 081111 6-25

2

R33 2.2K

LOC_RET

CR10

6.5V

-6.5V

FIGURE 7-10. OVERVOLTAGE PROTECTION

AND CURRENT MONITOR BOARD
A4, SCHEMATIC DIAGRAM

7-25/7-26

7-24/7-25

TO
A1-J2

TO
A4-J2

TO
J207/3
(A4-P401/3)

TO
CR203/G

TO
CHASSIS

TO
C204/PLUS

TO
CR203/A

TO
R203/K
(Pos.out.)

TO
A4-J4

TO
CR203/K

TO
C204/MINUS

TO
J207/4
(A4-P401/4)

J1

J2

J10

J11

J3

J4

J8

J5

J7

J9

J6

J12

1
2
3

1
2

1

1

1

1

1

1

1

1

1

1

REF
RCP1
RCP2

+C_MON

-C_MON

CR203_G

CHASSIS

+SENSING

+OUT

-OUT

-SENSING

CR1

5A/400V

RVC

NULL (=RPV1)

+S
+V

-V

-S

REF
RPC1
RPC2

+C_MON

-C_MON

*

(0.25" pitch)

-S

-V

CHASSIS-GND

+V
+S
RVC
RPV1
RPV2

*

(0.375" pitch)

-S

-V

CHASSIS-GND

+V
+S
RVC
RPV1
RPV2

TO R102/CCW

TO A1-J206/4
TO SHIELD OF "NULL" CABLE
TO SHIELD OF "RVC" CABLE

TO A1-J206/6

TO A1-J205/9

TO A1-J205/3

TO A1-J206/1

TB502

1
2
3

See Note 2

TB503

1
2
3

TB501-1

1
2
3
4
5
6
7
8

See Note 3

TB501-2

1
2
3
4
5
6
7
8

See Note 4

P501-@J201

9
8
7
6
5
4
3
2
1

REMOTE CURRENT
CONTROL (B)
TERMINAL BLOCK

CURRENT MONITOR
TERMINAL BLOCK

OUTPUT TERMINALS &
REMOTE VOLTAGE CONTROL
TERMINAL BLOCK

NOTES:

1) COMPONENTS MARKED WITH "*" SYMBOL ARE MODEL DEPENDENT
OR ARE NOT ALWAYS USED. CONSULT PARTS LIST FOR DETAILS.

2) TB502 LINK BETWEEN PIN 1 & 2 (FACTORY DEFAULT) ENABLES
THE CURRENT LIMIT CONTROL "B". REMOVE THE LINK TO DISABLE IT.

3) TB501-1 IS INSTALLED FOR 26954 & 26956 UNITS.
THE LINKS BETWEEN PIN 1 & 2 AND BETWEEN PIN 4 & 5 (FACTORY DEFAULT)

TO A1-P5/J205

TO A1-P4/J206

SET THE POWER SUPPLY IN LOCAL SENSING. REMOVE THE LINKS FOR REMOTE
SENSING.
THE LINK BETWEEN PIN 6 & 7 (FACTORY DEFAULT) ENABLES THE FRONT
PANEL VOLTAGE CONTROL. REMOVE THE LINK TO ENABLE A REMOTE
RESISTIVE VOLTAGE CONTROL.

4) TB501-2 IS INSTALLED FOR 26955 UNIT.
THE LINKS BETWEEN PIN 1 & 2 AND BETWEEN PIN 4 & 5 (FACTORY DEFAULT)
SET THE POWER SUPPLY IN LOCAL SENSING. REMOVE THE LINKS FOR REMOTE
SENSING.
THE LINKS BETWEEN PIN 6 & 7 (FACTORY DEFAULT) ENABLES THE FRONT
PANEL VOLTAGE CONTROL. REMOVE THE LINK TO ENABLE A REMOTE
RESISTIVE VOLTAGE CONTROL.

PROPRIETARY DATA
©2008, KEPCO, INC

PROPRIETARY DATA
©2008, KEPCO, INC

3020854

FIGURE 7-11. OUTPUT TERMINALS BOARD A5,

SCHEMATIC DIAGRAM

JQE 26956 SVC 081111 6-27

7-27/7-28

7-26/7-27