Electronic Modular Control Panel II (EMCP II) for EUI Engines Caterpillar

AC Offset Adjustment OP10

Usage:

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Table 1
OP10 Setpoints ⁽¹⁾ - AC Offset Adjustment
Setpoint	Name	Description	Range Of Value	Factory Default
PH A	Phase A Voltage Adjustment	Value used by the GSC in order to offset the voltmeter (for the phase A to neutral reading) from the actual voltage measurement.	-5.0% to +5.0% of measured voltage in increments of 0.04%	0
PH B	Phase B Voltage Adjustment	Value used by the GSC to offset the voltmeter (for the phase B to neutral reading) from the actual voltage measurement.	-5.0% to +5.0% of measured voltage in increments of 0.04%	0
PH C	Phase C Voltage Adjustment	Value used by the GSC to offset the voltmeter (for the phase C to neutral reading) from the actual voltage measurement.	-5.0% to +5.0% of measured voltage in increments of 0.04%	0
PH A-B	Phase A-B Voltage Adjustment	Value used by the GSC to offset the voltmeter (for the phase A to phase B reading) from the actual voltage measurement.	-5.0% to +5.0% of measured voltage in increments of 0.04%	0
PH B-C	Phase B-C Voltage Adjustment	Value used by the GSC to offset the voltmeter (for the phase B to phase C reading) from the actual voltage measurement.	-5.0% to +5.0% of measured voltage in increments of 0.04%	0
PH C-A	Phase C-A Voltage Adjustment	Value used by the GSC to offset the voltmeter (for the phase C to phase A reading) from the actual voltage measurement.	-5.0% to +5.0% of measured voltage in increments of 0.04%	0

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The setpoints are programmed to the default value at the factory. The setpoints may be changed in order to satisfy the customer requirements or the application requirements.

OP10 is the option for adjusting the voltmeter readings of the GSC. This adjustment may be necessary when generator sets are operated in parallel. The GSC AC voltage measurements are calibrated at the factory. An accurate standard is used. However, when two generator sets are paralleled, the application may require the paralleled generator sets to have exactly the same voltage value. The AC offset of one GSC is changed to match the voltage value of another generator set.

Note: It is NOT recommended that the AC offset be altered under any other circumstances. Performing this procedure takes the GSC out of factory calibration.

Procedure For Voltmeter Offset Adjustment

The paralleled generator sets must be running at rated speed. The generator sets can then have the voltage adjustment made.

Note: Service mode cannot be entered when the ECS is in the AUTO position.

Enter service mode on the GSC that is being adjusted. Enter the password. "OP 1" is showing on lower display. For more information, see the Systems Operation, "Password Entry OP3".

Press "SCROLL UP" key nine times. "OP 10" is showing on the lower display.

Press "SELECT" key. "AC CAL" is showing on lower display. The present A-B voltage value is showing on the upper display.

Press "SELECT" key. The voltage value is flashing.

Press the "SCROLL UP" key or press the "SCROLL DOWN" key in order to adjust the voltage. Adjust the value to exactly match the other generator set(s) that are running in parallel. Voltage value continues to flash.