KEPCO BOP 5-20DL, Operator'S Manual

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4-4
BOP 5-20DL 081915
4.2.5 ADJUSTMENT OF I
O
-OFF ZERO (A1A1R13) AND E
O
-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 precision shunt resistor across the BOP OUTPUT and COMMON terminals. Con-
nect 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 I
O
-OFF ZERO (A1A1R13) potentiometer (see Figure 4-2) for 0A ±(0.01% of I
O
nom)
as read on the DVM connected to the shunt. (For BOP 5-20DL I
O
nom 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 E
O
-OFF ZERO (A1A1R16) for 0V ±(0.01% of E
O
nom) as read on DVM. (For BOP 5-
20DL E
O
nom is 5V and adjustment tolerance is ±0.5mV.)
4.2.6 VOLTAGE CHANNEL ZERO ADJUSTMENT (A1R81)
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. Without a load connected at the output, set MODE switch to VOLTAGE and VOLTAGE CON-
TROL switch to OFF.
3. Place a short-circuit across front panel VOLTAGE PROGRAMMING INPUT terminals.
4. Connect DVM to the output sensing terminals, OUTPUT-SENSE and COMMON-SENSE.
5. Locate the E
O
COMP AMP ZERO control (see Figure 4-2, A1R81), then turn on BOP and
adjust the control for 0V ± (0.005% of E
O
nom), as read on DVM. For BOP 5-20DL, E
O
nom is
5V and the adjustment range is ±0.25mV.