How to Diagnostic and Repair PCC1302 PowerCommand Code 2972 – Field Overload

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If the time that the Field AVR Duty Cycle is operating at maximum output is longer than the time in the “Max Field Time” parameter, event/fault code 2972 will become active.

Possible Causes:

CAUTION

Excessive voltage is possible during testing. Make sure your meter can handle alternator full voltage.

1.Max Field Time Delay is set too low
2. Voltage sensing into the base board is too low, or there is an open/short circuit
3. Application issue

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Diagnosis and Repair:
1 Max Field Time Delay is set too low
a Through the operator panel, check the “Max Field Time” parameter setting. Verify that the “Max Field Time” is not set to zero. The “Max Field Time” parameter may require adjustment to a value more appropriate for the application. To access the Max Field

Time configuration menu on the operator panel go to Setup > OEM Setup > OEM Alt Setup > Max Field Time and set the “Max Field Time” parameter appropriately for the application. Refer to the parameter list to see the default value for “Max Field Time”.

2 Voltage sensing into the base board is too low, or there is an open/short circuit

a Measure the voltage going into the base board at L1 = J22-1, L2 = J22-2, L3 = J22-3,and LN = J22-4 (for single phase applications use L1, L2 and LN). If the generator set control is not sensing voltage, it will try to overcompensate by maxing out the AVR output. If the voltage going into the control board is zero, or less than the voltage that the control was calibrated for (Nominal Voltage), then check the wiring from the alternator to the base board for an open circuit or short circuit.

b If the generator set is over 600 VAC, check connections from the alternator to the PT,and from the PT to the base board. If there is voltage going into the PT, but not coming out of the PT, replace the PT.

Measure the output of the AVR at J17 -1 and J17-2 while turning the generator set on.
The output should be at least 300 VDC when the generator set is starting, but the voltage should decrease significantly when the generator set builds up voltage. If the output of J17-1 and J17-2 is constantly high or is locked in, then the AVR portion of the PCC is faulty. Replace the base board if the AVR is faulty.

3 Application issue
a. If the generator set runs adequately with no load or some load but as soon as additional load is applied, the generator set shuts down on “Field Overload”; then this
might be an application issue (load issue, generator set undersized, etc.).

Refer to the engine manual for correct threshold values and make the appropriate changes using InPower v14.5 pro.

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