Table 2-2. Troubleshooting - CONT - TM-55-1905-223-24-40049

TM 55-1905-223-24-4

Table,2-2. Troubleshooting - CONT

Malfunction

Test or Inspection

Corrective Action

STEP 1

Check for a malfunctioning voltmeter.

Using a voltmeter, check across the circuit breaker to determine phase loading:

Line 1 - Line 2

Line 2 - Line 3

Line 1 - Line 3

If the voltage drop between any two legs is more than 1O%, the load must be reconnected to the generator

set phases.

STEP 2.

Check for incorrect voltage regulator adjustment.

Using a multimeter check for generator output.

Maximum

Minimum

43 KW

33 KW

If output is not within specified range'.

Adjust the voltage regulator for proper voltage output, dampening and stability as follows:

WARNING

To avoid electrical shock. Make sure the generator set is off and the circuit breaker is on open.

(1) Secure generator set, then carefully remove the insulating sealant from the dampening, voltage, and

stability potentiometers on the regulator board.

(2) Rotate the voltage adjustment fully counterclockwise.

(3) Rotate the dampening adjustment fully clockwise.

(4) Adjust the remote rheostat to approximately mid-position.

(5) Connect a frequency meter to terminals V7 and VO (120 volts AC).

(6) Start the generator set.

(7) Verify that the generator set output frequency is-correct (60 Hz or 50 Hz for isochronous). Adjust the

frequency if necessary.

(8) If the frequency is correct, turn off the generator set.

(9) Disconnect the frequency meter from terminals V7 and VO and connect a voltmeter to terminals L1 and

L2 on the generator set circuit breaker.

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