KEPCO BOP 5-20DL Operator's Manual

MODEL

OPERATOR’S MANUAL

KEPCO INC.

ORDER NO. REV. NO.

BOP 5-20DL

BIPOLAR OPERATIONAL POWER SUPPLY

100W, 200W AND 400W

BOP 5-20DL

POWER SUPPLY

TABLE OF CONTENTS

SECTION PAGE

SECTION 1 - INTRODUCTION

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

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

1.3 Electrical Specifications, General............................................................................................................... 1-1

1.3.1 Static Specifications................................................................................................................................ 1-5

1.3.2 Dynamic Specifications........................................................................................................................... 1-6

1.4 Miscellaneous Features.............................................................................................................................. 1-6

1.4.1 Output Range.......................................................................................................................................... 1-6

1.4.2 Rear Programming Features................................................................................................................... 1-7

1.4.3 Output ON-OFF Port............................................................................................................................... 1-8

1.4.4 Load Reactance...................................................................................................................................... 1-10

1.4.5 Remote Turn-off...................................................................................................................................... 1-10

1.4.6 Circuit Breaker Shutdown Prevention (at Power Loss) Circuit................................................................ 1-10

1.4.7 References.............................................................................................................................................. 1-10

1.4.8 Series Or Parallel Operation ................................................................................................................... 1-10

1.4.9 Voltage Control Channel......................................................................................................................... 1-11

1.4.10 Mode Switch ............................................................................................................................................ 1-11

1.4.11 Current Control Channel ......................................................................................................................... 1-11

1.4.12 Bounding................................................................................................................................................. 1-11

1.4.13 Mode Lights............................................................................................................................................. 1-12

1.4.14 Remote Output ON-OFF LED................................................................................................................. 1-12

1.4.15 Standards................................................................................................................................................ 1-12

1.5 Mechanical Specifications .......................................................................................................................... 1-12

1.6 Equipment Supplied.................................................................................................................................... 1-12

TABLE OF CONTENTS

SECTION PAGE

3.4.2 Remote Voltage Control Using Resistance (Decade Box) ..................................................................... 3-10

3.4.3 Remote Voltage Control Using D-C Signal Voltage................................................................................ 3-11

3.4.4 Using the BOP as a Voltage Amplifier.................................................................................................... 3-12

3.4.5 Remote Control of Current Limiting........................................................................................................ 3-14

3.5 Remote Control of Current Control Channel.............................................................................................. 3-15

3.5.1 Remote Current Control Using Resistance (Potentiometer)................................................................... 3-16

3.5.2 Remote Current Control Using Resistance (Decade Box)...................................................................... 3-16

3.5.3 Remote Current Control Using D-C Signal Voltage................................................................................ 3-17

3.5.4 Using the BOP as a Current Amplifier.................................................................................................... 3-18

3.5.5 Remote Control of Voltage Limiting........................................................................................................ 3-19

3.6 Series and Parallel Connection of BOP Power Supplies........................................................................... 3-20

3.6.1 Series Connection, Master/slave Operation........................................................................................... 3-21

3.6.2 Circuit Breaker Control Circuit................................................................................................................ 3-22

3.6.3 Parallel Connection, Master/Slave Operation......................................................................................... 3-23

3.7 Indicator And Flag Logic Circuit................................................................................................................. 3-27

3.8 Digital Control of BOP Power Supplies...................................................................................................... 3-28

SECTION 4 - INTERNAL ADJUSTMENTS AND CALIBRATION

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

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

4.2.1 Adjustment of (±) 10 Volt Calibration Controls (A1R31, A1R32)............................................................ 4-2

4.2.2 Uncommitted Amplifier “A” Zero Adjustment (A1R41)............................................................................ 4-3

4.2.3 Uncommitted Amplifier “B” Zero Adjustment (A1R42)............................................................................ 4-3

4.2.4 Adjustment of Ammeter Zero Control (A1R50)....................................................................................... 4-3

LIST OF FIGURES

FIGURE TITLE PAGE

1-2 BOP Output Characteristic............................................. .. ........................................................................... 1-6

1-3 BOP Output WaveForm with Phase Shift................................................................................................... 1-7

1-4 Boundaries and Limits ................................................................................................................................ 1-11

1-5 Mechanical Outline Drawing, BOP 5-20DL................................................................................................. 2-15

2-1 BOP 5-20DL, Terminations and Controls, Front Panel............................................................................... 2-1

2-2 BOP Terminations and Controls, Rear Panel ............................................................................................. 2-3

2-3 A-C Source Voltage Selection .................................... .................................................. .............................. 2-3

2-4 Slide Installation on Full-rack Units............................................................................................................. 2-7

2-5 Load Connection Using Local Sensing at Rear Panel.................................................. .............................. 2-9

2-6 Load Connection Using Local Sensing at Front Panel ............................................................. .. ... ............. 2-9

2-7 Load Connection Using Remote Sensing at Rear Panel............................................................................ 2-10

2-8 Load Connection Using Remote Sensing at Front Panel ........................................................................... 2-10

3-1 Rear Programming Connector Terminals .......................................................... ... ...................................... 3-2

3-2 BOP Voltage Control Channel (Local Control, Local Sensing)................................................................... 3-4

3-3 BOP (±) Current Limiting Circuit (Local Control, Local Sensing) ................................................................ 3-6

3-4 BOP Current Control Channel (Local Control, Local Sensing) ................................................................... 3-7

3-5 BOP (±) Voltage Limiting Circuit (Local Control, Local Sensing) ................................................................ 3-8

3-6 Remote Potentiometer Control of D-C Output Voltage............................................................................... 3-9

3-7 Remote D-C Output Voltage Control Using Two-Terminal Resistance (Decade)....................................... 3-10

3-8 Digital Control of the D-C Output Voltage................................................................ ................................... 3-11

3-9 D-C Output Voltage Control with Non-inverting Configuration and High Impedance ±1V Signal Source... 3-12

3-10 Graphs Of Possible Input/output Waveshapes........................................................................................... 3-13

3-11 Basic Programming Circuit for Use of BOP as Bipolar Amplifier (Voltage Mode)....................................... 3-13

3-12 Programming Circuit for Driving Output Voltage with.................................................................................. 3-14

LIST OF TABLES

TABLE TITLE PAGE

1-1 General Specifications ...............................................................................................................................1-2

1-2 Output Range and Output Impedance ....................................................................................................... 1-4

1-3 Static Specifications: Output Effects, Offsets, And Reference Specifications ............................................1-5

1-4 Dynamic Specifications for Nominal Resistive Load ..................................................................................1-6

1-5 Dynamic Specifications, in Current Mode for 2mH Inductive Load ............................................................1-6

1-6 Rear Programming Connector Terminal Functions ....................................................................................1-7

1-7 Output ON-OFF Port A2J211, Pin Assignments ............................ ............................................................1-9

1-8 Current Loop Bandwidth Reduction by Adding Compensation

Capacitor to Rear Programming Connector (Resistive Load) ................................................................1-10

1-9 Equipment Supplied ................................................................................................................................... 1-12

1-10 Accessories - Not Supplied ........................................................................................................................1-13

1-11 Safety Symbols ..........................................................................................................................................1-13

2-1 BOP Front Panel Terminations and Controls .................................................................. ... ... ... ..................2-1

2-2 BOP Rear Panel Terminations and Controls ..............................................................................................2-2

2-3 Chassis Slide Mounting Holes ....................................................................................................................2-6

4-1 Internal Calibration Controls .......................................................................................................................4-1

SECTION 1 - INTRODUCTION

1.1 SCOPE OF MANUAL.

This manual contains instructions for the installation and opera tio n of th e BOP 5-20DL 100 Watt
Bipolar Operational Power Supply manufactured by Kepco, Inc., Flushing, New York, U.S.A.
The L suffix indicates that the unit is optimized to drive large inductive loads in a stable manner.

Not that throughout this manual E

O

represents the rated output voltage, 5V, and IO represents

the rated output current, 20A.

1.2 GENERAL DESCRIPTION.

Kepco Series BOP Bipolar Power Supplies are fully dissipative, linear stabilizers for laboratory
and systems applications. The BOP is an all solid-state design, featuring IC operational amplifi­ers in the control circuit section and silicon power transistors mounted on special fan-cooled
heat sinks in the complementary power stage.

The BOP has two bipolar control channels (volt age or cu rrent m ode), select a ble and individu ally
controllable either from their front panel controls, or by remote signals. Each of the principal con­trol channels is protected by bipolar limit circuits. In these limit circuits the positive and negative
current or voltage limit points can be manually set or remotely programmed simultaneously or
individually. Automatic crossover between each principal control channel and it s associated limit
channel is provided.

TABLE 1-1. GENERAL SPECIFICATIONS

SPECIFICATION RATING/DESCRIPTION CONDITION/COMMENT

A-C Input Voltage Nominal 104V / 115V / 208V / 230V Internal setting, see Figure 2-3

Range 95-113V / 105-125V / 190-226V / 210-250V

Brown-out 93V / 103V / 186V / 206V

Frequency 50 / 60 Hz nominal, ±3Hz range

A-C Input Current 11.0A Nominal output power,

sourcing, @115V/ 60Hz

Active Input power 1050W Nominal output power,

sourcing, @115V/ 60Hz

Power Factor 0.83 Nominal output power,

sourcing, @115V/ 60Hz

Input Leakage Current
(through earth-ground
connection)

0.1mA rms 115V/ 60Hz

Insulation Coordination Input Installation Cat. 2, Overvoltage Cat. 2,

Pollution Deg. 2

For TN or TT power systems

Output Installation Cat. 2, Overvoltage Cat. 2,

Max. 500V between COMMON

Output Power Source 100W (d-c or peak) For full operating temperature

range and full a-c input voltage
range.

Sink 100W (d-c or peak) Internal dissipative sink.

Fully operation in all voltage­current quadrants.

Source/Sink Output
Range- Main channel

Voltage Remote: -5V to +5V

Local: -5.25V to +5.25V

For remote, use programming
signal in +10V to -10V range
(with the default preamplifier).
See “DC Transfer Factor” on
page 1- 2 for tolerances

Current Remote: -20A to +20A

Local: -21A to +21A

Source/Sink Output
Range- Limit channel

Voltage +0.05V to +6.2V, for positive limit

-0.05V to -6.2V, for negative limit

Remote or local.
For remote programming of all
limits, use programming signal
in 0V to +10V range.
±2% Full scale tolerance

Current +0.05A to +22A, for positive limit

-0.05A to -22A, for negative limit

Static Specifications See Table 1-3
Output Impedance See Table 1-2
Analog Readback

Accuracy

Voltage 0.02% of rated output voltage (1mV) Zero to ±10V for zero to

± Rated output voltage or
current

Current 0.1% of rated output current (20mA)

TABLE 1-1. GENERAL SPECIFICATIONS

SPECIFICATION RATING/DESCRIPTION CONDITION/COMMENT

Protection Input overcurrent Always trips input circuit breaker

Heatsink

overtemperature

Always trips input circuit breaker

Input power loss Jumper on rear programming connector

offers choice whether or not to trip input cir-

cuit breaker

Series or Parallel
connection of identical
units

Type of

connection

Master-Slave Contact factory for more than 3-

units being connected in series
or in parallel

Implementation Using external wiring, no standard cables

provided
Front Panel See Figure 2-1 and Table 2-1
Rear Panel See Figure 2-2 and Tables 1-6 and 1-7 Provides access to rear

programming connector and
Output ON-OFF port

Output Leakage Current
(COMMON terminal to chassis-ground,
with GND-network disconnected)

0.05mA rms / 5mA p-p Nominal output power,
sourcing, @115V/ 60Hz

Temperature: Operating 0°C to +55°C

TABLE 1-1. GENERAL SPECIFICATIONS

SPECIFICATION RATING/DESCRIPTION CONDITION/COMMENT

1.3.1 STATIC SPECIFICATIONS

The static specifications are listed in Table 1-3. The BOP output effects, in response to the t a bu­lated variations in the Influence Quantities, are given In Table 1-3 for the built-in input and feed­back resistor values of the voltage and current chan nel preamplifiers.

T ABLE 1-3. STATIC S PECIFICATIONS: OUTPUT EFFECTS, OFFSET S, AND

REFERENCE SPECIFICATIONS

INFLUENCE QUANTITY

OUTPUT EFFECTS

(1)

PREAMPLIFIER

(4)

OFFSETS

VOLTAGE MODE CURRENT MODE

REFERENCE

±10V

TYPICAL MAXIMUM TYPICAL MAXIMUM

)

SOURCE VOLTAGE (min-max):



0.001%



0.005% <5V <1nA <0.0005%

LOAD (no load-full load):



0.008% 0.5mA

1mA

——

<0.0005%
TIME (8-hour drift): 0.005% 0.01% 0.01% 0.02% <20V <1nA 0.005%
TEMPERATURE (per °C): 0.005% 0.01% 0.01% 0.02% <20V <1nA 0.005%

RIPPLE AND NOISE:

(2)

rms 1mV 3mV 0.01% 0.03% — — —

p-p

(3)

10mV 30mV

0.1% 0.3%

—— —

(1) Output effects, expressed as a percentage, are referred to the maximum rated output voltage or current.
(2) Measured with the common terminal grounded so that the common mode current does not flow through the load.
(3) Peak-to-peak ripple Is measured over a 20 Hz to 10 MHz bandwidth.
(4) To permit calculating of the effect of non-standard control current (less than the normal 1 mA) of non-standard gain

ratios.

E

ioIio

1.3.2 DYNAMIC SPECIFICATIONS

Dynamic specifications are listed in Ta ble 1-5 for a nominal resistive load, and in Table 1-5 for a
2mH inductive load (current mode). The typical dynamic responses of the BOP output are tabu­lated in both the time domain (Output response to a step program) and in the frequency domain
(bandwidth) for large and small signals.

1.4 MISCELLANEOUS FEATURES

TABLE 1-4. DYNAMIC SPECIFICATIONS FOR NOMINAL RESISTIVE LOAD

MODEL

3dB

BANDWIDTH

(KHz)

RISE AND FALL

TIME 10-90%

(S)

LARGE SIGNAL FRE­QUENCY RESPONSE

(KHz)

SLEW

RATE

REOVERY AT

STEP LOAD

(S)

Voltage Current Voltage Current Voltage Current Voltage Current Voltage Current

BOP 5-20DL 3.5 10 125 50 3.5 10 0.08V/S0.9A/S 250 75

TABLE 1-5. DYNAMIC SPECIFICATIONS, IN CURRENT MODE FOR 2mH INDUCTIVE LOAD

MODEL

3dB BANDWIDTH

(Hz)

RISE & FALL TIME

10%-90%

msec)

BOP 5-20DL 140 2.5

NOTE: The BOP is operating as a source if the direction of its output voltage is the same a s

the direction of its output current. The BOP is operating as a sink if the direction of its
output voltage is opposite that of its output current. An illustrative case is shown in Fig­ure. 1-3, where the BOP is programmed to deliver a sine wave output and where the
load produces a phase shift between the output voltage and current.’

FIGURE 1-3. BOP OUTPUT WAVEFORM WITH PHASE SHIFT

1.4.2 REAR PROGRAMMING FEATURES

E

o

I

o

SOURCE SOURCE

SINK SINK

(+)
(-)

3043440

8+Io Limit Input Refer to PAR. 3.3.2
32 –Eo Limit Input Refer to PAR. 3.3.4
34 –Io Limit Input Refer to PAR. 3.3.2
10 Current Sensing Amp. Output Analog output voltage (0 to ±10V, 1 mA max) proportional

to the prevailing BOP output current for remote metering
or monitoring.

20 Voltage Sensing Amp. Output Analog output voltage (0 to ±10V, 1 mA max) proportional

to the prevailing BOP output voltage.

21, 43, 44,

45, 46

Not Used.

12, 14 Reserved. (Not to be used).
16, 18 Current Mode Compensating Terminals Refer to PAR. 1.4.4
26, 36 Turn-off Signal Output Refer to PAR, 3.6.2

24 Circuit Breaker Control Refer to PAR, 3.6.2
41 Non-isolated Turn-off Signal Input Refer to PAR, 3.6.2

47/48,

49/50

Optically Isolated Turn-off Signal Input Refer to PAR, 3.6.2

17 Voltage Comparison Amp Input Analog input voltage of 0 to ±10V will produce 0 to ± full

TABLE 1-6. REAR PROGRAMMING CONNECTOR TERMINAL FUNCTIONS (CONTINUED)

TERMINAL
(Figure 3-1

FUNCTION DESCRIPTION

TABLE 1-7. OUTPUT ON-OFF PORT A2J211, PIN ASSIGNMENTS

PIN SIGNAL NAME FUNCTION

1---Not Used
2 ON-OFF_CTRL Optically isolated signal that controls output to be either ON (enabled)

or OFF (disabled).
OFF: 0V to 0.4V or no connection (open circuit) at pin 2, referenced
to pin 3. Turns OFF within 100S max (between 10% point of
controlling signal and a) 10% point of output voltage for voltage mode
with no load or b) 10% point of output current for current mode with
short circuit.
ON: 3.5V to 24V d-c at pin 2 referenced to pin 3; input current is 1mA
±0.3mA. Turns ON within 100S max (between 90% point of
controlling signal and a) 90% point of output voltage for voltage mode
with no load or b) 90% point of output current for current mode with

short circuit.
3 ISO_GND Return for ON-/OFF_CTRL and for /ON_OFF_FLAG signals.
4 /ON-OFF_FLAG Flags whether output set to ON or OFF. This isolated flag signal is the

collector of an optocoupler-transistor, with the emitter connected to pin

3. Optocoupler transistor is saturated when the output is ON (enabled).

Current through the transistor should not exceed 1.6mA and supply

voltage should not exceed 24V.

OFF level: determined by (Vext) - (Rext) (Icoff) where:

1.4.4 LOAD REACTANCE

The BOP 5-20DL power supply is optimized for driving large inductor loads (L suffix). Factory
test were performed with loads up to 1H, however higher values are possible.

CAUTION: When driving heavy inductive loads with high currents, it is possible for the

BOP and the load to be damaged by an A-C input power loss which prevent s
the load's stored energy from being dissipated inside the BOP. To avoid pos­sible damage observe the following:

• Use UPS to supply the BOP.

• Set BOP output current and/or voltage to zero and turn off the BOP after
the output current actually reaches a zero value.

• Use properly rated (voltage and current) bipolar transorbs or a properly
rated bipolar crowbar element connected directly at the output of the
BOP. An alternative is a Normally-Closed Contactor connected across the
output of the BOP. These options may also be combined.

When driving an inductive load, if the system becomes unstable at the crossover between volt­age limit mode and current m ode, the BOP 5-20DL can be further optimized by reducing the
current loop bandwidth. This can be accomplished by connecting a ceramic capacitor across
pins 16 and 18 of the Rear Programming Connector (see Figure 3-1 and Table 1-6). Refer to

!

1.4.9 VOLTAGE CONTROL CHANNEL

The Bipolar Voltage Amplifier, with a fixed gain (See Table 1-1 for gain value) is connected via
the MODE switch to the Voltage Preamplifier (see Figure 3-2). If the VOLTAGE CONTROL
switch is on, the BOP output voltage can be locally controlled by means of the (front panel) (±)
10 volts bias source, from (–) 100% (through zero) to (+) 100% of the rated value. The Voltage
Preamplifier is provided with a Zero control and all its terminals are available at the Rear Pro­gramming Connector for rem o te co n tro l o f th e output voltage. Control methods are described in
PAR. 3.4.

1.4.10 MODE SWITCH

The BOP is equipped with a front panel-mounted M ODE switch, which selects bipolar voltage or
bipolar current control. See paragraph 1.4.14 for remote MODE control.

1.4.11 CURRENT CONTROL CHANNEL

The Bipolar Current Amplifier, with a fixed gain (See Table 1-2 for gain value) is connected via
the MODE switch to the Current Preamplifier (see Figure 3-4). If the CURRENT CONTROL
switch is on, the BOP output current can be locally controlled by means of the (front panel) (±)
10 volts bias source, from (–) 100% (through zero) to (+) 100% of the rated value. The Current
Preamplifier is provided with a Zero control and all its terminals are available at the Rear Pro­gramming Connector for remote control of the output current. Control methods are described in
PAR. 3.5.

1.4.13 MODE LIGHTS

Four (4) front panel (LED type) indicator lamps monitor the prevailing operating mode of the
BOP. For each operating condition (Voltage Mode, Current Mode, ± E

o

Limit, ± Io Limit) the cor­responding indicator lamp energizes. Simultaneous TTL flags are available on the Rear Pro­gramming Connector. See PAR. 3.7

1.4.14 REMOTE OUTP UT ON-OFF LED

This LED indicates the status of the output, in accordance with the signal received at the rear
panel OUTPUT ON-OFF Port. The indicator is on for output on (enabled) and off for output off
(disabled).

1.4.15 STANDARDS

BOP models are designed and tested in accordance with NEMA Standard for Stabilized Power
Supplies, d-c output, Publication No. PY-1.1972.

1.5 MECHANICA L SPECIFICATIONS

See Mechanical Outline Drawing, Figure 1-5 for dimensions and finish. Two (2) digital meters,
monitoring the ± d-c output voltage and the ± d-c output current, are provided. The full rack BOP
5-20DL model is 75 lbs. (34 kg) unpacked.

1.7 ACCESSORIES

Accessories (not supplied) are listed in Table 1-10.

1.8 SAFETY

Service must be referred to authorized personnel. Using the power supply in a manner not
specified by Kepco. Inc. may impair the protection provided by the power supply. Observe all
safety precautions noted throughout this manual. Table 1-11 lists symbols used on the power

TABLE 1-10. ACCESSORIES - NOT SUPPLIED

ITEM

FUNCTION

KEPCO

PART NUMBER

Rear Programming
Connector, Unwired

50-terminal printed circuit connector, unwired, for access to all rear
programming connections and flag-signal outputs.

PC-12

Slides Ease of access to adjustments through top cover 110 QD

(Jonathan)

4886 Interface Card Allows remote programming of BOP via GPIB or RS 232 interface using

IEEE 488 and SCPI commands and queries. NOTE: Contact Kepco to
disable ON-OFF Port before using this card.

BIT 4886

802E Interface Card Allows remote programming of BOP via Ethernet /LAN using web pages.

NOTE: Contact Kepco to disable ON-OFF Port before using this card.

BIT 802E

081915 15

FIGURE 1-5. MECHANICAL OUTLINE DRAWING,

BOP 5-20DL

ON−OFF

OUTPUT

PORT

ON−OFF

1-15/(1-16 Blank)

-14/(-15

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.

2.13. If any indication of damage

is found, file an immediate claim with the responsible transport service.

2.2 TERMINATIONS, CONTROLS AND INDICATORS

a) Front Panel: Refer to Figure 2-1. See Table 2-1 for an explanation of terminations,

controls and indicators.

b) Rear Panel: Refer to Figure 2-2 and Table 2-2 for an explanation of terminations.

7 CURRENT meter IO d-c digital output ammeter
8 CURRENT control Provides manual adjustment of BOP d-c output current when CURRENT

CONTROL switch set to ON.

9 CURRENT CONTROL

switch

Provides manual adjustment of BOP d-c output current when CURRENT
CONTROL switch set to ON.

10 Io Mode indicator LED lamp, indicating current mode operation.
11 CURRENT PROGRAMMING

INPUT terminals

Programming input terminals for current control channel.

12 CURRENT LIMITS (+)

control

Control for manual adjustment of the positive (+) current limit.

13 CURRENT LIMIT indicator LED lamp, indicating current limiting operation.
14 CURRENT LIMITS (–)

control

Control for manual adjustment of the negative (–) current limit.

15 SENSE (Output) terminal Used for OUTPUT sense connection.
16 OUTPUT terminal Used to connect power supply to load (parallel with rear panel barrier strip

terminals).

17 GROUND terminal Ground terminal (parallel with rear panel barrier strip terminals)

TABLE 2-1. BOP FRONT PANEL TERMINATIONS AND CONTROLS (CONTINUED)

FIG.

INDEX NO.

NAME OF TERMINATION

OR CONTROL

FUNCTION

FIGURE 2-2. BOP TERMINATIONS AND CONTROLS, REAR PANEL

2.3 A-C INPUT REQUIREMENTS

This power supply is shipped wired for operation on a single phase, nominal 115V a-c line. For

See

Table 2-2

for functions.

2.5 PRELIMINARY CHECKOUT

NOTES: 1. The Rear Programming Connector supplied with the unit (PC-15) is prewired for

local control (see Simplified Schematic Diagram, Figure 3-29) and must be attached
to the BOP. The PC-12 Rear Programming Connector is unwired and available as
an accessory.

2. With either no signal or logic 0 at OUTPUT ON-OFF Port pins 2 and 3, output volt­age (in voltage mode) or output current (in current mode and a load connected) will
have the preadjusted output value. See Table 1-1 and PAR. 4.2.5 for details.

3. If the unit is in current mode with no load connected and either no signal or logic 0 is
applied to OUTPUT ON-OFF Port pins 2 and 3, the unit will go into voltage limit, dis­playing the preadjusted limit value with the same polarity as the output current off­set. The front panel Volt age Limit indicator will go on and the Current Mode indicator
will go off.

A simple operating check after unpacking, and before permanent installation, is advisable to
ascertain whether the BOP has suffer ed damage in shipment. Refer to Figur es through 2-2 an d
Tables 2-1 and 2-2 for the location and function of the operating controls and terminals. Proceed
as follows:

1. Connect the BOP to a 115V a-c source, or refer to paragraph 2-4 for conversion to other a­c input voltages if required.

5. Turn the VOLTAGE control (3) clockwise through its range, while observing the front panel
VOLTAGE meter (4). The BOP output voltage should smoothly respond, from the maxi­mum negative output voltage, through zero, to the maximum positive output voltage of the
BOP.

6. At the rear panel, disconnect the positive voltage connected between pins 2 and 3 of the
OUTPUT ON-OFF port. Verify the front panel VOLTAGE meter shows zero Volts and the
REMOTE OUTPUT ON-OFF indicator goes off.

7. At the front panel, turn a-c circuit breaker/POWER switch (1) to OFF.

8. Connect a short circuit between the OUTPUT (16) and the COMMON (18) termina ls on the
front panel.

9. At the rear panel, reconnect the positive volt age betwe en pins 2 a nd 3 of the OUTPUT ON­OFF port.

10. Set the BOP front panel controls as follows:
a) Set MODE switch (6), to CURRENT.
b) Set CURRENT CONTROL sw itch (9), to ON, and rotate CURRENT control (8) to its

maximum counterclockwise position.

2.6 INSTALLATION OF FULL-RACK BOP MODELS

NOTE: 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 (55° C).

Refer to the Mechanical Outline Drawing, Figure 1-5 for Full Rack models. Full-rack BOP mod­els are delivered with the Fixed Angle Brackets and the Chassis Side Support Bars installed.
For bench operation, both of these components may be removed. The full-rack BOP unit may
be installed into standard (19-inch) equipment racks, or onto any other flat surface after remov­ing the four (4) bottom aluminum feet. If chassis slides are not used, the BOP may be installed
onto any flat surface by means of the provided plastic mounting inserts on the bottom of the
BOP chassis.

NOTE: If slide installation (as described below) is not desired, other means of supporting the

unit in the rear must be provided (additional re ar bracke ts or a solid platform, for exam­ple) since the front angle brackets alone are not sufficient to support the full weight of
the unit.

2.6.1 SLIDE INSTALLATION.

The Chassis Slide Support Bars of the BOP are pre-drilled to accept Jonathan Series 110 QD
slides. The slides listed in Table 2-3 can be accommodated.

2.7.2 LOAD CONNECTION, REMOTE SENSING

The basic interconnections between the BOP and the load using remote sensing are shown in
Figure 2-7 (using the rear panel) and Figure 2-8 (using the front panel). This is the recom­mended load connection for all applications requiring minimum load effect acr oss a remote load.
A twisted or shielded pair of wires (No. 22 AWG minimum) are connected from the BOP sensing
terminals to the load. For the BOP 5-20DL this remote error sensing technique will compensate
for load wire voltage drops up to 0.25 volts per wire.

NOTE: Observe polarities: the COMMON sensing wire must go to the COMMON load wire,

the OUTPUT sensing wire must go to the OUTPUT load wire.

2.7.3 A-C GROUND

The metal cases of electronic equipment which are operated from the a-c power line must be
kept at ground potential at all times. If the 3-wire line cord with 3-prong safety plug (supplied
with this equipment) is used in combination with a properly grounded a c power outlet, this is
taken care of automatically. If a non-grounded outlet is used, the case must be grounded sepa­rately. A separate GROUND terminal is provided for this purpose on the front panel as well as
on the rear of the BOP.

The GROUND terminal is connected to chassis of the unit and to the local earth-ground poten­tial through the A-C power line cord. It can be used a) as a grounding point for the output of the
unit, and b) for doubling the a-c power cord earth-ground connection if necessary by providing a

FIGURE 2-5. LOAD CONNECTION USING LOCAL SENSING AT REAR PANEL

SECTION 3 - OPERATION

3.1 INTRODUCTION

BOP Bipolar Operational Power Supplies can be used in a great variety of applications. As a
precision voltage or current source, the BOP output can be controlled locally by means of the
front panel bipolar VOLTAGE and CURRENT controls or remotely by means of resistance or
voltage signals or an optional digital interface (see PAR. 3.42). Independently adjustable or
remotely programmable limit circuits for both output voltage and output current protect a sensi­tive load from any overvoltage or overcurrent.

NOTE: Before using the BOP in any application, please refer to Section 2 to get acquainted

with the operating controls, a-c power requirements and information on load connec­tions and grounding. Front panel components identified by index numbers in parenthe­ses are shown in Figure 2-1.

3.2 POWER SUPPLY BASICS

As a Bipolar Amplifier , the BOP output responds to such input signa ls as sine, square or trian gu­lar waves. A ±10 volt input signal will program the BOP output (voltage or current) through its
rated output ranges. Built-in preamplifiers, for the voltage, as well as the current channel of the
BOP, permit amplification of the control signals to the required amplitude and provide the inter­face with high, as well as low, impedance signal sources.

!

Application and test set up diagrams on the following pages show the symbolic and simplified
representation of the four programmable circuits of the BOP:

• Voltage Control Channel: see Figure 3-2 and PAR. 3.3.1 for local control.

•(±) I

O

Limit Circuits: See Figure 3-3 and PAR. 3.3.2 for local control.

• Current Control Channel: see Figure 3-4 and PAR. 3.3.3 for local control.

•(±) E

O

Limit Circuits: see Figure 3-5 and PAR. 3.3.4 for local control.

The complete simplified diagram is shown in Figure 3-29 at the end of this section. The four cir­cuits can be programmed separately as described in the examples in th is section, or one main
channel and two limit channels can be used simultaneously as the application req uires. The two
main bipolar voltage and current channels are manually selected by the front panel MODE
switch.

The numbered terminals in the simplified diagrams of this section correspond to the terminals of
the Rear Programming Connector (see Figure 3 -1 . The ter mina l de sig nated C (Comm on) corr e­sponds to terminals numbers 23, 25, 27, 29, 31 or 33 on the Rear Programming Connector

NOTE: BOP’S have front and rear output terminals. Only the front terminals are shown on all

subsequent simplified diagrams.

3.2.1 EXTERNAL PROGRAMMING RESISTORS.

External programming resistors should be high-quality units, with low-temperature coefficients.
Resistors should be selected carefully , since in most applications, the limitations for stability and
drift are due not to the BOP, but to the programming resistors. Selection criteria for resistors are:

• Temperature coefficient

• Leakage (in values above 100k ohm)

• Humidity effects

• Drift with time

• Self-heating (power dissipation)

• Tolerance.

For variable resistors (potentiometers or rheostats) similar selection criteria apply. In addition,
such specifications as listed below should be carefully considered if the application requires:

• End resistance

• Linearity

3.2.5 EXTERNAL CURRENT MONITOR

Use signal I

O

Sensing Output at pin 10 of the Rear Programming Connector (see Figure 3-1) for
external current monitoring. This signal is not buffered. Use a series 5K resistor in combina tion
with a high impedance monitoring device, or an external high impedance buffer between the
BOP and the monitoring device.

CAUTION: An accidental short-circuit at this terminal while the unit is in Current mode

or Current limit mode will damage the BOP power stage.

There is no overvoltage protection. This stage is prot ected against short-circuit by th e intrinsic
protection of the op-amp generating this signal. This signal is used by the BIT card if it is
installed.

3.3 LOCAL (FRONT PANEL) OUTPUT CONTROL

3.3.1 VOLTAGE MODE OPERATION WITH CURRENT LIMITING.

The BOP may be used as a stabilized (d-c) source of positive or negative voltage with output
current limiting (for either polarity) pre-selected for the application at hand. The output must be
enabled via a positive voltage applied between pins 2 and 3 of the OUTPUT ON-OFF port (see
Table 1-7 and Figure 2-2 for details).

Figure 3-2 illustrates the voltage control circuit configured for local (front panel) control using

Proceed as follows:

1. Determine the output voltage and current requirements of your load. Set the BOP MODE
switch (8, Figure 2-1) to VOLTAGE and the VOLTAGE CONTROL switch (4) to ON.

2. With the POWER circuit breaker/switch (2) set to OFF, connect a short circuit across the out­put terminals and set POWER to ON again.

3. Adjust CURRENT LIMITS controls for –I (18) and +I (16) polarities as required, monitoring
the output CURRENT meter (11) for the correct limiting value. Proceed as follows:

a. Turn VOLTAGE control (3) fully counterclockwise.
b. Adjust –I CURRENT LIMITS control (18) as required.
c. Turn VOLTAGE control (3) fully clockwise.
d. Adjust the +I CURRENT LIMITS control (16) as required.
e. Turn VOLTAGE control (3) to the center of its range.
f. Set POWER circuit breaker/switch to OFF; remove the short circuit from the output and

reconnect the load.

3.3.2 LOCAL CONTROL OF CURRENT LIMITING

Figure 3-3 shows the Current Limit ing circu it configured for local sensing and local (front panel)
control.

+

22

28

C

+

10V

10V

POWER

STAGE

-

+

G
A
T
E

-

+

+

-

8

34

1

+

+

-

+

-

+

-

(+)I o LIMIT-

AMP (EXT)

(+)I o LIMIT-

AMP (INT)

(-)I o LIMIT-

AMP (INT)

(-)I o LIMIT-

AMP (EXT)

(+)

I o LIMIT

CONTROL

BIAS

15V

(-)

I o LIMIT

CONTROL

(+)

I o LIMIT-

COMP AMP

(-)

I o LIMIT-

COMP AMP

DRIVER

COMMON

BOP

I o

LIMIT CHANNEL

PART OF REAR PROGRAMMING CONNECTOR

57.6K

57.6K

LOAD

-

+

S

R

COM

S

OUT

S

NOTES:

1. Local Sensing shown (links installed
between COM and S and between
OUT and S terminals).

2. On rear programming connector install
jumpers between terminals (1) and (34)
and between (34) and (8).

CURRENT

SENSE AMP

I o CAL

FIGURE 3-4. BOP CURRENT CONTROL CHANNEL (LOCAL CONTROL, LOCAL SENSING)

BOP CURRENT

CONTROL CHANNEL

PART OF REAR PROGRAMMING CONNECTOR

22

C

+

+

28

CURRENT
CONTROL

CURRENT

PROGRAMMING

INPUT

OFF

10V

10V

ON

10K

10K

13

15

4

NOTES:

1. Set MODE Switch to CURRENT.

2. Set CURRENT CONTROL switch to ON for local
(front panel) control and OFF for remote control.

3. Local sensing shown. Remote sensing not
recommended for Current control.

4. For inductive loads in excess of 0.5mH, the BOP
output response may be optimized by placing a
capacitor across terminals 16 and 18 of the Rear
Programming Connector (

Io COMP AMP).

Io ZERO

POWER

STAGE

COMMON

ZERO

+

10K

PREAMP

"B"

­2

19

Io COMP

AMP

+

-

DRIVER

R

G

A
T
E

S

C

16 18

LOAD

3043683

COM

S

OUT

S

SIGNAL

GROUND

R

i

f

R

3.3.4 LOCAL CONTROL OF VOLTAGE LIMITING

Figure 3-5 shows the Voltage Limiting circuit configured for local sensing and local (front panel)
control. The circuit functions in a manner similar to the I

O

Limit circuit described previously (refer
to PAR. 3.3.2), except that the voltage limit feedback is derived by means of a voltage divider
across the BOP output.

In the local (front panel) control mode, as well as in the external control mode, a 0 to 10 vo lt sig­nal, applied at the inverting inputs of the ± E

O

Limit Comparison amplifiers, will control the volt­age limit point over the entire output current range of each BOP model. For the internal (front
panel) control mode, the control signal is derived across both 10 volt reference sources, ap plied
by means of the ± E

O

Limit controls to the internal ± EO Limit amplifiers and directed to the

respective inputs of the ± E

O

Limit Comparison amplifiers. In the internal control mode, both ±E

O

Limit Amplifiers (EXT) are biased off by the 15V bias source.

S

+

-

6

32

3

+

+

­+

BIAS

15V

(-)Eo LIMIT
CONTROL

(+)Eo LIMIT-

COMP AMP

PART OF REAR PROGRAMMING CONNECTOR

NOTES:

1. Local Sensing shown (links installed between COM
and S and between OUT and S terminals).

2. On Rear Programming Connector install jumpers between
terminals (3) and (32) and between (32) and (6).

3.4 REMOTE CONTROL OF VOLTAGE CHANNEL

Remote control of the voltage channel is accomplished by using an external configuration to
substitute for the internal control voltage produced by the front panel VOLTAGE CONTROL.

3.4.1 REMOTE VOLTAGE CONTROL USI NG RESISTANCE (POTENTIOMETER)

When configured as shown in Figure 3-6, Preamp “A” with the built-in feedback and input resis­tors has a gain of one and the fixed gain of all BOP models is designed so that a d-c input signal
of zero to (±)10 volts will control the BOP output through its specified range. When the front
panel VOLT AGE CONTROL switch (4, Figure for 3/4 r ack, Figur e 2-1 for full ra ck) is set to OFF,
operation is similar to local control described in PAR. 3.3.1, except that an external potentiome­ter is substituted for the front panel VOLTAGE control (3).

PART OF REAR PROGRAMMING CONNECTOR

28

C

+

VOLTAGE
CONTROL

OFF

10V

ON

10K

10K

11

9

C

7

NOTES:

1. Set MODE Switch to VOLTAGE.

2. Remote Sensing shown. For local sensing disconnect
wires between S terminals and load, then restore local
sensing links.

5

ZERO

PREAMP

"A"

-

+

2.49K

OUT

S

10K

(EXT.)

(EXT.)

REMOTE

VOLTAGE

CONTROL

20K

REMOVE

SENSING LINK

R

i

R

i

f

R

3.4.2 REMOTE VOLTAGE CONTROL USING RESISTANCE (DECADE BOX)

Two-terminal resistance control of the d-c voltage (for example, by means of a Decade Box
(make-before-break type) or any variable resistance) can be exercised as shown in Figure 3-7.

The external switch (S1), connected across the (±) reference voltage, is used to pre-select
either positive or negative output by setting it to the applic ab le re fe re n ce vo ltage pola rity.

PREAMP “A” functions here as an inverter. Its output can be expressed by the equation:
E

O (PREAMP “A”)

= –E

ref

(Rf/Ri). where

R

f

= Decade Resistor.

R

i

= Ext. Input Resistor
The BOP output voltage will vary linearly with the change in decade resistance.
This programming system can be calibrated very accurately by setting the external Remote

Voltage Control (Decade) to zero, and adjusting for zero output volts using the screwdriver­adjusted E

O

ZERO control while monitoring the BOP output with a digital voltmeter. The maxi-

mum output voltage is calibrated by making all or part of R

i

a rheostat and adjusting it with the

Remote Voltage Control at maximum resistance, to the maximum BOP output voltage.

3.4.3 REMOTE VOLTAGE CONTRO L USING D-C SIGNAL VOLTAGE

The BOP d-c output voltage can be controlled directly by a ±10V d-c signal, applied to the front
panel Voltage Programming Input terminals. An interesting example of how this can be imple­mented is the use of a Kepco SN Digital Programmer to convert digital input to the analog ±10V
d-c signal. The digital input to the SN programmer can be provided by a computer, or manually
by means of a keyboard. Th e analog output fr om the SN is from zero to ± 10 volts and const i­tutes the input programming voltage for the BOP.

The connections between the SN Programmer and the BOP are illustrated in Figure 3-8. This
programming system provides a resolution of 12-bits with a linearity of (±)1/2 LSB (0.0122%).
The digital and the power supply grounds are isolated (optical isolation) to 1000 volts. Calibra­tion of the system is performed with the provide d controls on the SN Programmer.

PART OF REAR PROGRAMMING CONNECTOR

28

C

+

VOLTAGE
CONTROL

OFF

10V

ON

10K

10K

11

9

C

7

NOTES:

1. Set MODE Switch to VOLTAGE.

2. Remote sensing shown (links removed). For local
sensing disconnect leads beteen S terminals and
load, then install links between COM and S terminals
and between OUT and S terminals.

5

ZERO

PREAMP

"A"

-

+

2.49K

OUT

S

KEPCO

REMOVE

SENSING LINK

DIGITAL

INPUT

R

i

f

R

FIGURE 3-9. D-C OUTPUT VOLTAGE CONTROL WITH NON-INVERTING CONFIGURATION

AND HIGH IMPEDANCE ±1V SIGNAL SOURCE

3043884

BOP VOLTAGE

CONTROL CHANNEL

PART OF

REAR PROGRAMMING CONNECTOR

+

22

28

C

+

VOLTAGE

CONTROL

VOLTAGE

PROGRAMMING

INPUT

10V

OFF

10V

ON

10K

10K

11

9

C

7

POWER

STAGE

NOTES:

1. Set MODE Switch to VOLTAGE.

2. Remote sensing shown (links removed). For
local sensing disconnect leads beteen S
terminals and load, then install links between
COM and S terminals and between OUT and
S terminals.

3. Remove jumpers between terminals (7) and (9)
and between (11) and (C) on Rear Programming
Connector.

COMMON

5

Eo ZERO

-

17

+

Eo COMP

AMP

ZERO

PREAMP

"A"

-

+

2.49K

DRIVER

G
A
T
E

COM

S

OUT

S

LOAD

SIGNAL

GROUND

REMOVE

SENSING LINK

REMOVE

SENSING LINK

HIGH

IMPEDANCE

BIPOLAR
SOURCE

(EXT.)

R 3K (EXT.)

f

E

i

0

TO

±1V

R 2K (EXT.)

i

OUT

COM

instead of the front panel Voltage Programming Input terminals (inverting).

If the external programming source does not have sufficient amplitude to drive the BOP over its
full output range, the gain of Preamp “A” must be changed from the built-in value to suit the
application. To calculate the required components for the new gain requirement, the output
equation for Preamp “A” in the inverting configuration is used:

E

O (PREAMP “A”)

= –Ei (Rf/Ri)

where E

O

(Preamp “A”) = ±2.5V, and the values of Rf and Ri depend on the available amplitude

of the programming source. If, for example, a ±1 volt source is available, the ratio R

f/Ri

must be

2.5, and the two resistor values can be 10K and 24.9K respectively. The built-in resistor (R

i

=

10K) can be retained, and only R

f

must be replaced with a 24.9K metal film (1/2 watt) resistor.
The necessary connections are illustrated in Figure 3-12. Gain control can be exercised by mak­ing R

f

a rheostat instead of a fixed resistor.

PART OF REAR PROGRAMMING CONNECTOR

28

C

+

VOLTAGE

CONTROL

OFF

10V

ON

10K

11

9

C

7

NOTES:

1. Set MODE Switch to VOLTAGE.

2. Remote sensing shown (links removed). For
local sensing disconnect leads between S
terminals and load, then install links between
COM and S terminals and between OUT and
S terminals.

5

ZERO

PREAMP

"A"

-

+

2.49K

S

REMOVE

SENSING LINK

24.9K

f

R

i

R

FIGURE 3-13. SYMMETRICAL REMOTE CONTROL OF THE CURRENT LIMITS

3043706

+

22

28

C

+

10V

10V

POWER

STAGE

-

+

G
A
T
E

-

+

+

-

8

34

1

+

+

-

+

-

+

-

(+)I o LIMIT-

AMP (EXT)

(+)I o LIMIT-

AMP (INT)

(-)I o LIMIT-

AMP (INT)

(-)I o LIMIT-

AMP (EXT)

(+)

I o LIMIT

CONTROL

BIAS

15V

(-)

I o LIMIT

CONTROL

(+)

I o LIMIT-

COMP AMP

(-)

I o LIMIT-

COMP AMP

DRIVER

COMMON

BOP

I o

LIMIT CHANNEL

PART OF REAR PROGRAMMING CONNECTOR

57.6K

57.6K

LOAD

-

+

S

R

COM

S

OUT

S

NOTES:

1. Local Sensing shown (links installed between COM
and S and between OUT and S terminals).

2. On rear programming connector install jumpers between
terminals (8) and (34) and remove jumper between (1)
and (34).

CURRENT

SENSE AMP

I o CAL

SIGNAL

GROUND

+

±I o LIMIT

CONTROL

0-10V

(EXT.)

1

PART OF REAR PROGRAMMING CONNECTO R

NOTES:

1. Local Sensing shown (links installed between COM
and S and between OUT and S terminals).

3.5.1 REMOTE CURRENT CONTROL USING RESISTANCE (POTENTIOMETER)

Similar to the local (front panel) control mode described in PAR. 3.3.3, the BOP output current
can be controlled over the full output range by means of and external resistance in place of the
front panel CURRENT CONTROL as shown in Figure 3-15. The control potential (zero to
(±)10V) is applied via Preamp “B,” operating with unity gain, to the l

O

Comp. Amp which drives
the Power Stage with a fixed gain as listed in Table 1-2. A d-c control signal from zero to (±)10V
will, therefore, control the BOP output current through its specified range.

BOP CURRENT

PART OF REAR PROGRAMMING CONNECTOR

22

C

+

+

28

CURRENT
CONTROL

CURRENT

PROGRAMMING

INPUT

OFF

10V

10V

ON

10K

10K

13

15

4

NOTES:

1. Set MODE Switch to CURRENT and CURRENT
CONTROL switch to OFF.

2. Local sensing shown. Remote sensing not
recommended for Current control.

3. For inductive loads in excess of 0.5mH, the BOP
output response may be optimized by placing a
capacitor across terminals (16) and (18) of the
Rear Programming Connector (

Io COMP AMP).

Io ZERO

POWER

STAGE

ZERO

+

10K

PREAMP

"B"

­2

19

Io COMP

AMP

+

-

DRIVER

R

G
A
T
E

S

C

16 18

LOAD

COM

OUT

S

SIGNAL

Ri

10K

(EXT.)

(EXT.)

REMOTE
VOLTAGE
CONTROL

20K

f

R

3.5.3 REMOTE CURRENT CONTROL USING D-C SIGNAL VOLTAGE

See Figure 3-17 for remote current control using a d-c signal voltage.
See Figure 3-18 for remote current co ntrol using a high impedance ±1V voltage. Preamplifier

“B” is used in the non-inverting configuration, so the output current will have the same polarity
as the input programming signal.

BOP CURRENT

NOTES:

1. Set MODE Switch to CURRENT and CURRENT
CONTROL switch to OFF.

2. Local sensing shown. Remote sensing not
recommended for Current control.

3. For inductive loads in excess of 0.5mH, the BOP
output response may be optimized by placing a
capacitor across terminals (16) and (18) of the
Rear Programming Connector (

Io COMP AMP).

Io ZERO

POWER

STAGE

ZERO

+

10K

PREAMP

"B"

­2

19

Io COMP

AMP

+

-

DRIVER

R

G

A
T
E

S

16 18

LOAD

COM

OUT

S

SIGNAL

10K

CURRENT

PROGRAMMING

INPUT

PART OF REAR PROGRAMMING CONNECTOR

DIGITAL

INPUT

ANALOG

OUTPUT

(0 TO ±10V)

KEPCO

SN

DIGITAL

PROGRAMMER

(ONE CHANNEL)

COM

OUT

22

C

+

28

+

ON

OFF

10V

10V

10K

CURRENT
CONTROL

C

15

4

13

f

R

i

R

3.5.4 USING THE BOP AS A CURRENT AMPLIFIER

See Figure 3-19 to configure the BOP as a current-stabilized bipolar amplifier.
See Figure 3-20 to drive output current using a bipolar signal voltage less than ±10V.
See Figure 3-21 to drive output current using a high impedance source.

NOTES:

1. Set MODE Switch to CURRENT and CURRENT
CONTROL switch to OFF.

2. Local sensing shown. Remote sensing not
recommended for Current control.

3. For inductive loads in excess of 0.5mH, the BOP
output response may be optimized by placing a
capacitor across terminals (16) and (18) of the
Rear Programming Connector (

Io COMP AMP).

Io ZERO

POWER

STAGE

ZERO

+

10K

PREAMP

"B"

­2

19

Io COMP

AMP

+

-

DRIVER

R

G
A
T
E

S

16 18

LOAD

COM

OUT

S

15

C

13

4

PART OF REAR PROGRAMMING CONNECTOR

+10V

BIPOLAR

PROGRAMMER

(EXTERNAL)

-10V

COM

CURRENT

PROGRAMMING

INPUT

C

28

22

OUT

+

10V

+

10V

CURRENT
CONTROL

ON

OFF

10K

10K

f

R

i

R

FIGURE 3-21. PROGRAMMING CIRCUIT FOR DRIVING OUTPUT CURRENT WITH

A HIGH IMPEDANCE SOURCE

3.5.5 REMOTE CONTROL OF VOLTAGE LIMITING

BOP CURRENT

CONTROL CHANNEL

NOTES:

1. Set MODE Switch to CURRENT and CURRENT
CONTROL switch to OFF.

2. Local sensing shown. Remote sensing not
recommended for Current control.

3. On Rear Programming Connector:
remove jumper between terminals (15) and (C),
add jumper between terminals (2) and (4).

4. For inductive loads in excess of 0.5mH, the BOP
output response may be optimized by placing a
capacitor across terminals (16) and (18) of the
Rear Programming Connector (

Io COMP AMP).

Io ZERO

POWER

STAGE

COMMON

ZERO

+

PREAMP

"B"

­2

19

Io COMP

AMP

+

-

DRIVER

R

G
A
T
E

S

16 18

LOAD

COM

S

OUT

S

SIGNAL

GROUND

15

C

13

4

10K

10K

CURRENT
CONTROL

PART OF REAR PROGRAMMING CONNECTOR

HIGH Z

INPUT

SOURCE

0 TO ±10V

BIPOLAR

PROGRAMMER

(EXTERNAL)

3043705

22

C

COM

OUT

28

10V

+

10V

+

ON

OFF

CURRENT

PROGRAMMING

INPUT

FIGURE 3-23. INDEPENDENT REMOTE CONTROL OF +EO AND –EO VOLTAGE LIMIT

3.6 SERIES AND PARALLEL CONNECTION OF BOP POWER SUPPLIES.

3043889

+

22

28

C

+

10V

10V

-

+

-

+

+

-

6

32

3

+

+

-

(+)Eo LIMIT-

AMP (EXT)

(+)Eo LIMIT-

AMP (INT)

(-)Eo LIMIT-

AMP (INT)

(-)Eo LIMIT-

AMP (EXT)

(+)Eo LIMIT

CONTROL

BIAS

15V

(-)Eo LIMIT
CONTROL

COMMON

BOP Eo

LIMIT CHANNEL

PART OF REAR PROGRAMMING CONNECTOR

57.6K

57.6K

NOTES:

1. Remote sensing shown (links removed). For local sens ing
disconnect leads between S terminals and load, then install
links between COM and S terminals and between OUT and
S terminals.

2. On Rear Programming Connector remove jumper between
terminals (3) and (32) and between (32) and (6).

REMOVE

SENSING LINK

REMOVE

SENSING LINK

DRIVER

SIGNAL

GROUND

S

POWER

STAGE

COM

OUT

LOAD

S

+E o LIMIT

CONTROL

0-10V
(EXT.)

-E o LIMIT

CONTROL

0-10V

(EXT.)

+ +

(-)Eo LIMIT-

COMP AMP

(+)Eo LIMIT­COMP AMP

+

-

­G

A
T

E

3.6.1 SERIES CONNECTION, MASTER/SLAVE OPERATION

Two or more BOP power supplies can be connected in series to increase output voltage. One
series-connection limitation is the isolation limit of the BOP itself (500V); contact Kepco if more
than three units is series are required. Figure 3-24 shows a master/slave connection of two BOP
power supplies.

BOP VOLTAGE

PART OF REAR PROGRAMMING CONNECTOR

+

22

28

C

+

VOLTAGE
CONTROL

VOLTAGE

PROGRAMMING

INPUT

10V

OFF

10V

ON

10K

10K

11

9

C

7

POWER

STAGE

NOTES (MASTER):

1. Set MODE Switch to VOLTAGE.

2. Set VOLTAGE CONTROL switch to ON.

3. Install sense link between OUT and S terminals.

4. Remove link between COM and S terminals.

5

Eo ZERO

-

17

+

Eo COMP

AMP

ZERO

PREAMP

"A"

-

+

2.49K

DRIVER

G
A
T
E

COM

S

OUT

S

REMOVE

LINK

T

R

new SLAVE, front panel VOLTAGE PROGRAMMING INPUT. Place the MODE switch on the
BOP added to the series combination to VOLTAGE and the VOLTAGE CONTROL switch OFF.

1. Connect the BOP supplies as shown in Figure 3-24. Set the MO DE switches and the VOLT­AGE CONTROL switches as directed in the set-up diagram, Figure 3-24.

a. Load-wire size should be rated to at least the maximum load current and load-wire pairs

should be twisted or tied together to keep the indu ct ance a nd EMI as low as possible . For
remote sensing, use #22 AWG twisted pair wires.

b. Use shielded cabl e for connecting the coupling resistor (R

T

). Connect shield to chassis-

ground. Either the positive or the negative output side of the system can be grounded.

c. The coupling resistor (R

T

) should be either a wirewound or a metal film component with a
low temperature coefficient. For BOP 5-20DL this value is 2.49K (either 1/4 or 1/2 Watt).
This value of R

T

will be able to drive the BOP Slave unit to its (±) maximum output voltage

as the BOP Master is controlled through its range.

d. Both BOP powe r supp lies shou ld be con nected to the power line using a common circuit

breaker. Alternatively, the BOP Circuit Breaker Control Circuit, as described in PAR.

3.6.2, can be used to interconnect both BOP’s in such a way that if one of them should
fail, the other one is automatically shut down also.

2. Turn BOP‘s on and begin operation. The syst em as shown in Figure 3-24 operates in Volt-

• A manual, non-isolated turn-off is provid ed which, when implemented with an ex ternal
switch contact as shown in Figure 3-25, will energize the diode in the first optocoupler
(LC-1). thus providing the SCR turn-on.

• If it is not

desired to trip the circuit breaker (CB101) upon a-c line power loss, it can be
prevented by a jumper wire or an external switch across terminals 24 and 2 5 on the Rear
Programming Connector. In this manner, Q1 is inhibited from providing a turn-on signal
for Q2, thus avoiding triggering the SCR and tripping the circuit breaker.

+

+

DRIVER

COLLECTOR

SUPPLY

CR4

COM

LC1

+5V

FAST

TURN OFF

ON

Q2

PART OF

CB101

COMMON

LC2

TO

DRIVER

ASSEMBLY

(A3)

THERMO

SWITCH

ON A4

R4

Figure 3-26 shows a simple parallel master/slave connection of no more than two BOP power
supplies. The configuration shown in Fig ure 3-26 ca n be used for mast er/sla ve parallel con nec ­tion of two BOP power supplies (three are shown in Figure 3-27). The configuration shown in
Figure 3-27 is more stable and accurate than that shown in Figure 3-26 since is includes com­pensation that eliminates the parasitic voltage drop on the COM connections of the slaves.

1. Connect the BOP supplies as shown in Figure 3-26 or 3-27.
a. Set the MODE switches and the VOLTAGE and CURRENT CONTROL switches as

directed in the set-up diagram, Figure 3-26 or 3-27.

b. Load-wire size should be rated for at least the maximum load current and load-wire pairs

should be twisted or tied together to keep the inductance and EMI as low as possible.
Use shielded cable for the drive signal connection between the BOP’s. Connect the
shield to common ground. For remote sensing, use #22 AWG twisted pair wires.

c. Both BOP power supplies should be connected to the power line using a common circuit

breaker. Alterna tively, the BOP Circuit-Breaker Control Circuit, as described in PAR. 3.6.2
can be used to interconnect both BOPS in such a way, that if one of them should fail, the
other one is automatically shut down also.

2. Following the set-up procedure as described above, turn BOP’s on and commence opera-

tion. The system as shown in the set-up diagram, Figure 3-26 or 3-27, operates in the Volt­age Mode, since the MASTER MODE switch is set to VOLTAGE. For operation in the

POWER

STAGE

COMMON

NOTES (Master):

1. Set MODE switch to VOLTAGE.

2. Set VOLTAGE CONTROL switch to ON.

NOTES (SLAVE):

MASTER

PART OF REAR PROGRAMMING CONNECTOR

22

10

28

C

+

+

PREAMP

"A"

BOP VOLTAGE

CONTROL CHANNEL

10K

OFF

4

VOLTAGE

PROGRAMMING

INPUT

10K

VOLTAGE

CONTROL

ON

OFF

10V

10V

10K

11

C

7
9

2.49K

Eo ZERO

Eo COMP

AMP

ZERO

17

2.49K

5

G
A

T

E

Io SENSING

AMP

DRIVER

S

R

COM

S

OUT

S

LOAD

TWIST

REMOVE

LINK

REMOVE

LINK

PART OF REAR PROGRAMMING CONNECTOR

(CHASSIS)

TWIST

ON

OFF

MASTER

10

22

C

+

10V

28

+

10V

Eo ZERO

VOLTAGE

PROGRAMMING

INPUT

Io SENSING

AMP

BOP VOLTAGE

CONTROL CHANNEL

COMMON

S

Eo COMP

AMP

10K

VOLTAGE

CONTROL

10K

C

17

ZERO

PREAMP

"A"

11

7

9

2.49K

NOTES (MASTER):

1. For Voltage Mode (shown) set MODE Switch to VOLTAGE and
VOLTAGE CONTROL Switch to ON.

2. For Current mode, set MODE Switch to CURRENT and CURRENT
CONTROL Switch to ON.

3. If external control is needed, set the CONTROL switch to OFF and
use either the corresponding VOLTAGE or CURRENT
PROGRAMMING INPUT or the appropriate rear programming
connector terminals.

G

A
T
E

DRIVER

5

R

POWER

STAGE

SCOM

OUT

S

LOAD

TWIST

REMOVE

LINKS

NOTES (SLAVE 1):

1. MODE Switch position to: CURRENT

2. CURRENT CONTROL Switch to: OFF

3. R1 (A and B) and R2 (A and B) are matched
pairs, 0.01% tolerance, metal film, 0.25W.

4. Remove rear programming connector jumpers
between pins 4 and 13 and between pins 15 to 27.

OFF

43

44

10K

4

C

2.49K

19

Io COMP

AMP

DRIVER

G
A
T
E

+

-

-

+

-

+

TWIST

-

PART OF

REAR

PROGRAMMING

CONNECTOR

NOTE 3

(EXT.) R2B

20K

(EXT.) R1B

20K

(EXT.) R2A

20K

(EXT.) R1A

20K

PART OF REAR

PROGRAMMING

CONNECTOR

PART OF REAR

PROGRAMMING CONNECTOR

TWIST

3.7 INDICATOR AND FLAG LOGIC CIRCUIT

Digital Logic Circuits (IC15, IC16, IC17) as shown in Figure 3-28 are used in the BOP to drive
the front panel LEDs which indicate the prevailing operating mode:

E

O

LIMIT MODE (DS101)

I

O

LIMIT MODE (DS102)

E

O

MODE (DS103)

I

O

MODE (DS104)

REMOTE (DS105)

Together with these visual front panel indicators , TTL-compa tible status flags ar e provided at the
Rear Programming Connector for the above BOP operating modes. All status flags available on
the rear programming connector indicate a logic ”0” If the BOP is operating in the indicated
operating mode, and a logic “1” if it is not.

5

4

6

1

DS101

Eo LIMIT

DS102

Io LIMIT

+5V

RN1

FLAG

Eo LIMIT

"1"

30

LAMP

DRIVERS

IC17

+5V

"0"

"1"

PART OF REAR PROGRAMMING CONNECTOR

FROM

Eo/

Io LIMIT

COMPARATORS

The logic status signals shown in Figure 3-28 are valid for the BOP operating in voltage mode
(E

O

MODE) and local mode (not driven by the GP lB interface). The BOP 5-20DL uses the front
panel REMOTE ON-OFF indicator shows the output on-off status as determined by signals
applied to the OUTPUT ON-OFF Port.

3.8 DIGITAL CONTROL OF BOP POWER SUPPLIES.

The BOP 5-20DL is configured with a remote output ON-OFF POR T which inte rfaces electrically
and mechanically with the digital control assembly used by a BIT Interface card which must be
installed for digital control. If digital control is required, contact Kepco to disable the output ON­OFF PORT and allow installation of the optional BIT interface card. Digital control options avail­able are via either GPIB and RS 232 using a BIT 4886 Interface Card, or ethernet/LAN using a
BIT 802E Interface card. Both cards are compliant with IEEE 488 and SCPI commands and
queries. For more details, see www.kepcopower.com/bit.htm.

081915 29

FIGURE 3-29. SIMPLIFIED SCHEMATIC DIAGRAM,

BOP 5-20DL

I

I

I

I

I

I

I

I

I

I

I

I

I

I

-I





I

I

I



3-29/(3-30 Blank)

-28/(-29

SECTION 4 - INTERNAL ADJUSTMENTS AND CALIBRATION

4.1 GENERAL

This section contains the procedures for all internal adjustments and calibrations.
All internal adjustment controls are illustrated In Figure 4-1 and listed in Table 4-1. Table 4-1

explains the purpose of each control and references the applicable adjustment procedure.
NOTE: These controls are factory ca librated. Re-calibration is necessary only if components,

related to the circuitry involving these controls have to be replaced.

TABLE 4-1. INTERNAL CALIBRATION CONTROLS

REFERENCE

DESIGNATION

(SEE FIGURE 4-1)

CONTROL NAME PURPOSE

ADJUSTMENT

PROCEDURE

A1R31, A1R32 ±10V CA L. Reference Voltage Calibration PAR. 4.2.1

A1R41

PREAMP ’A” ZERO Uncommitted Amplifier “A“ Zero Adjustment PAR. 4.2.2

A1R42

PREAMP ’B” ZERO Uncommitted Amplifier “B“ Zero Adjustment PAR. 4.2.3

A1R50

AMMETER ZERO Sensing Amp. Offset Adjustment PAR. 4.2.4

A1R81

(1)

Eo COMP AMP ZERO Voltage Channel Zero Adjustment PAR. 4.2.6

4.2.2 UNCOMMITTED AMPLIFIER “A” ZERO ADJUSTMENT (A1R41)

1. Without a load connected at the output, set MODE switch to VOLTAGE and VOLTAGE CON­TROL switch to OFF.

2. Place a short circuit across the front panel VOLTAGE PROGRAMMING INPUT terminals.

3. Connect a Digital Voltmeter (DVM) to Rear Programming connector pin 5, referenced to pin
29 (signal common).

4. Locate the PREAM P “A” ZERO control (see Figur e 4-2, A1R41), then turn the BOP on and
adjust control for 0V ±0.1mV, as read on DVM.

4.2.3 UNCOMMITTED AMPLIFIER “B” ZERO ADJUSTMENT (A1R42)

1. Without a load connected at the output, set MODE switch to VOLTAGE and VOLTAGE CON­TROL switch to OFF.

2. Place a short circuit across the front panel CURRENT PROGRAMMING INPUT terminals.

3. Connect a Digital Voltmeter (DVM) to Rear Programming connector pin 2, referenced to pin
29 (signal common).

4. Locate the PREAM P “B” ZERO control (see Figur e 4-2, A1R42), then turn the BOP on and

4.2.5 ADJUSTMENT OF IO-OFF ZERO (A1A1R13) AND EO-OFF ZERO (A1A1R16)

1. At rear panel, disconnect positive voltage between pins 2 and 3 of the OUTPUT ON-OFF
port (if present) (2, Figure

2-2) to turn the output OFF (refer to Table 1-7 for detailed signal

requirements).

2. Connect prec ision shunt resistor across the BOP OUTPUT and COMMON te rminals. Con­nect DVM to the shunt’s sensing terminals for output current measurements.

3. Set MODE switch to CURRENT and CURRENT CONTROL switch to OFF, then turn the
BOP on.

4. Adjust IO-OFF ZERO (A1A1R13) potentiometer (see Figure 4-2) for 0A ±(0.01% of IOnom)
as read on the DVM connected to the shunt. (For BOP 5-20DL IOnom is 20A and adjustment
tolerance is ±2mA.)

5. Turn off the BOP and remove the shunt resistor from the output. Connect the DVM to the
output sensing terminal of the BOP (OUT S and COM S).

6. Set MODE switch to VOLTAGE and VOLTAGE CONTROL switch to OFF, then turn the BOP
on.

7. Adjust EO-OFF ZERO (A1A1R16) for 0V ±(0.01% of EOnom) as read on DVM. (For BOP 5­20DL E

O

nom is 5V and adjustment tolerance is ±0.5mV.)

4.2.7 CURRENT CHANNEL ZERO ADJUSTMENT (A1R83)

1. At rear panel, apply positive voltage between pins 2 and 3 (return) of the OUTPUT ON-OFF
port (2, Figure

2-2) to enable (turn on) the output. Refer to Table 1-7 for signal requirements.

2. With the unit turned off, connect a precision current measuring shunt, rated for the unit's
nominal output current (20A for BOP 5-20DL) to the output.

3. Connect DVM to the shunt's sensing terminals.

4. Set MODE switch to CURRENT and CURRE NT CONTROL switch to OFF.

5. Place a short circuit across the front panel CURRENT PROGRAMMING INPUT terminals.

6. Locate the Io COMP AMP ZERO control (see Figure 4-2, A1R83), then turn on BOP and
adjust control for 0A ±(0.005% of IOnom), as read on DVM. For BOP 5-20D L, IOnom is 20A
and the adjustment range is ±1mA.

4.2.8 CALIBRATION OF IO FULL SCALE OUTPUT CURRENT (A3R316) AND FRONT PANEL
AMMETER (A7AR3B)

1. Turn BOP off and remove the cover (see Figure 4-2).

2. Connect either a precision ammeter or a precision current-measuring shunt resistor to the