KEPCO BOP 5-20DL, Operator'S Manual

Page: 46 / 70

3-12
BOP 5-20DL 081915
FIGURE 3-9. D-C OUTPUT VOLTAGE CONTROL WITH NON-INVERTING CONFIGURATION
AND HIGH IMPEDANCE ±1V SIGNAL SOURCE
As seen in Figure 3-9, the original input feedback components of Preamp “A” have been
bypassed and are replaced by external resistors (metal film or wire-wound type resistors may be
used and connected directly to the Rear Programming Connector terminals as shown). Preamp
“A” is used in the non-inverting configuration, so the output voltage will have the same polarity
as the input programming signal. Its output voltage (the necessary BOP control voltage) is given
by:
E
O (PREAMP “A”)
= or E
O (PREAMP “A”)
=
E
O(unit)
= (±2.5V) (2V/V) = ±5V
Consequently, as the bipolar input voltage (E
i
) is controlled from –1V through zero to +1V, the
BOP output voltage will follow over its specified range. Calibration of the system can be per-
formed at the programming source, or the Preamp “A” ZERO control can be used for the low
end, while the feedback resistor (R
f
= 3K Ohms) can be trimmed to calibrate the high end of the
range.
3.4.4 USING THE BOP AS A VOLTAGE AMPLIFIER
If, instead of the d-c control signal (see PAR. 3.4.3), an a-c signal voltage is applied to the Volt-
age Programming Input terminals, the BOP functions as a bipolar amplifier. As an amplifier, the
BOP voltage gain is set on each BOP model so that (as with the d-c control signal) a bipolar a-c
input signal with an amplitude of 0V to 20V (peak-to-peak) will drive the BOP output through its
specified (±) output voltage range. All other dynamic specifications are given in Table 1-5.
The BOP can be used to amplify, sum or scale a variety of waveshapes, some of which are illus-
trated in Figure 3-10. All input signals are shown 180° out of phase with their corresponding out-
put waveshapes. The latter can be readily produced in phase (i.e. with the output wave taking
the same direction as the input signal) by addressing the non-inverting input of Preamp “A”
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
E
i
R
f
R
i
+
R
i
------------------
(± 1V)
3KOhms 2KOhms
+
2KOhms
----------------------------------------------------
± 2.5V
=