KEPCO BOP 5-20DL, Operator'S Manual

Page: 45 / 70

BOP 5-20DL 081915
3-11
3.4.3 REMOTE VOLTAGE CONTROL 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 imple-
mented 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. The analog output from the SN is from zero to ± 10 volts and consti-
tutes 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. Calibra-
tion of the system is performed with the provided controls on the SN Programmer.
FIGURE 3-8. DIGITAL CONTROL OF THE D-C OUTPUT VOLTAGE
Since all terminals of Preamp “A” are available at the Rear Programming Connector, d-c output
voltage control can be exercised in many other ways. Preamp “A” can be treated as an uncom-
mitted operational amplifier, with its applicable transfer functions. Its initial offsets can be zeroed
with the provided control, while the offset variations are specified Table 1-3). The basic principle
of d-c output voltage control of the BOP is that a control voltage of (±)10 volts at 1 mA at the
Voltage Programming Input (with the built-in feedback/input resistors) will produce the full d-c
output voltage swing of the BOP. If the selected control signal does not have the required ampli-
tude or if the required control current cannot be supplied, the Preamp “A” configuration can be
altered to provide the proper interface for the application.
For example, if the BOP d-c output is to be controlled by means of a bipolar, 1 volt, high imped-
ance source, it can be connected to the BOP as shown in Figure 3-9.
3043883
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.
COMMON
5
Eo ZERO
-
17
+
Eo COMP
AMP
ZERO
PREAMP
"A"
-
+
2.49K
DRIVER
G
A
T
E
COM
S
OUT
S
KEPCO
SN
DIGITAL
PROGRAMMER
(ONE CHANNEL)
LOAD
ANALOG
GROUND
REMOVE
SENSING LINK
REMOVE
SENSING LINK
DIGITAL
GROUND
OUT
COM
ANALOG
OUTPUT
(0 TO ±10V)
DIGITAL
INPUT
R i
f
R