Startup

Startup and troubleshooting procedures for the AVC63-12 and AVC125-10

are listed in the following procedure.

Symptoms of startup problems stemming from improper regulator adjustments

and certain generator system problems that resemble faulty regulation are

listed with possible solutions. Simplifying the system by eliminating components,

such as remote adjustment potentiometers and other nonessential items, can

be helpful in the troubleshooting process. Adjustments, options, and an operational

test are included in the paragraphs following the procedure.

1. Ensure that the regulator has been installed in accordance with the Installation

and Connections paragraphs before proceeding with system startup.

2. Start the prime mover and bring it up to rated speed.

If the voltage does not build up:

a. Flash the field.

b. Remove power for one minute to reset the overexcitation circuit.

3. Slowly adjust the VOLT potentiometer or external, voltage adjust rheostat until

the voltage reaches nominal.

If the voltage will not build up to rated:

Check the generator output for a shorted or excessive load.

4. Apply and remove the generator load to check stability.

If the generator response is too slow or is hunting (oscillating):

a. Check the generator output for a shorted or excessive load. Adjust the STB

potentiometer with no load applied.

b. Check stability of the governor.

5. Check regulation under normal operating conditions.

If the regulation is poor:

a. Check that the prime mover is up to rated speed.

b. Check that the voltmeter is connected at the same point as the regulator

sensing.

c. Use an average-sensing voltmeter (not an rms-sensing voltmeter).

6. Reduce the generator frequency. The generator output should decrease

from this point.

If the generator output voltage does not decrease at the desired frequency:

a. Check that all wiring is in accordance with the connection diagrams provided

in this instruction sheet.