How to Solve PCC1302 PowerCommand Engine Code 1447

This instruction show you guide on how to solve PCC1302 PowerCommand engine/generator fault code 1447 low AC voltage shutdown.

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Logic:
One or more of the phase voltages has dropped to 85% of nominal for more than 10 seconds.

Possible Causes:
1 Fault simulation feature is enabled
2 Incorrect threshold setting or AVR settings
3 Overload
4 Improper connections at generator output terminals
5 The voltage sense or setup wiring connection could be incorrect
6 Damaged voltage regulator
7 The rotating rectifier assembly (diodes CR1 through CR6) is faulty

Diagnosis and Repair:
1 Fault simulation feature is enabled
a. Connect InPower.
b. Verify that the fault simulation is NOT enabled for the engine speed sensor by connecting to the PCC via InPower. If the fault simulation is disabled, there is no problem.

2 Incorrect threshold setting or AVR settings
a. Check threshold settings.
b. Connect InPower.
c. Verify that fault threshold is within the normal operating range for low AC voltage.
d. Verify AVR settings. Compare gains, settings, and calibration factors against default calibrations.
e. Adjust or recalibrate as necessary

3 Overload
a. Check for overload.
b. Check that load is within proper operating range.
c. Check inrush current.
d. Check for current spikes.

e.Check for motor starts.
f. Check operation by disconnecting the load and restarting the unit.
g. Correct any overload.

4 Improper connections at generator output terminals
a. Check connections.
b. Compare connections in generator to wiring schematic.
c. Correct according to the appropriate schematic as needed.

5 The voltage sense or setup wiring connection could be incorrect
a. Verify that the voltage sensing inputs J22-1, J22-2, J22-3, and J22-4 are connected to L1, L2, L3, and L4 respectively.
b. Verify that excitation inputs J18–1 and J18–2 are connected to the correct generator PMG terminals.

6 Damaged voltage regulator
a. Bring the generator to idle.
b. Connect InPower.
c. Using InPower, verify that the AC voltage output is greater than residual.
d. If the AC voltage output is residual, than the regulator is operating correctly.
e. Inspect the voltage regulator and the generator control harness connector pins.
f. Turn off the generator.
g. Disconnect the generator control harness from the voltage regulator.
h. Visually inspect for corroded pins, bent or broken pins, pushed back or expanded pins.

7 The rotating rectifier assembly (diodes CR1 through CR6) is faulty
a. Check each diode. See the alternator service manual.