Programmable Current Limit Calibration; Output Voltmeter Calibration - Pacific UPC-32 Operation Manual

SECTION 8 CALIBRATION

8.2.2 PROGRAMMABLE CURRENT LIMIT CALIBRATION

1. Connect the high current load to the output of the power source.
2. Connect an Ammeter to the load wiring (Shunt type preferred).
3. Program the UPC Voltage to drive a load at 60% of rated output current of the power source @
60 Hz.
4. Set the Programmable Current limit parameter of the UPC steady-state program to 50% of rated
output current of the power source.
5. Apply output power to the load. Adjust R24 of the DRM PCB until the RMS current measured
with the ammeter probe equals that of the programmed current limit value (in RMS amps).
Refer to Figure 8.2 for control locations.

8.2.3 OUTPUT VOLTMETER CALIBRATION

The second step in the MANUAL calibration process is to calibrate the Output Voltmeter. Only one
meter circuit is used for all voltage, current and power measurements. If other metering functions are
out of specification after calibrating the Phase A voltmeter, return the unit for repair. The Output
Voltmeter is calibrated as follows: (Refer to Figure 8.2 for control locations)
1. Remove top cover of the chassis.
2. Turn on the system. Load and Execute a program with the following parameters:
PROGRAM: #1
FREQ=60
#SEGS=0
3. Calibrate the Metering Circuit by measuring the Power Source output voltage, Phase A to
Neutral, at the output terminal block with the 4½ digit DVM. Adjust R64 of the Metering PCB
until the Va display on the front reads the same as the output voltage.
V/I METER:
FREQ=60.00
SENSE=INT
MANUAL MODE Ia=00.0
5. Turn off the system.
6. Replace top cover of the chassis.
FORM=3 COUPLING=DIRECT
Va=125.0 Vb=125.0
WFa=1 WFb=1
Ilim=50 PHb=120º
Va=125.0 Vb=125.0
Vab=208.0 Vbc=208.0 Vca=208.0
Ib=00.0
110
Vc=125.0
WFc=1
PHc=240º
ENTRY: 125.0
Vc=125.0
Ic=00.0