5-11
Table 5-3. Troubleshooting Chart - Continued.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
6. POOR REGULATION - Continued.
Step 4.
Check that the generator output waveform is not distorted due to harmonic content
(Regulator senses average voltage; meter may be indicating RMS values.)
If this condition exists, consult the generator manufacturer.
If this condition does not exist, proceed to step 5.
Step 5.
Check that the UNIT/PARALLEL switch (if installed, if not go to step 6) is in the PARAL-
LEL position when the generator is paralleled and in the UNIT position when the
generator is operating alone. Also check that the switch functions properly.
If the switch is not in the proper position, set switch to correct position.
If the switch is defective, replace switch.
If the switch is set to the proper position, proceed to step 6.
Step 6.
Check that load is not unbalanced as regulator averages all three phases together.
(Three-Phase Sensing ONLY. All others proceed to step 7.)
If load is unbalanced, balance load.
If load is balanced, proceed to step 7.
Step 7.
Verify that prime mover is operating at rated speed.
If prime mover is not operating at rated speed, change prime mover speed to rated.
If prime mover is operating at rated speed, proceed to step 8.
Step 8.
Check for fault in either exciter or generator.
If a fault exists, correct fault condition.
If a fault does not exist, proceed to step 9.
Step 9.
If the above steps fail to correct the malfunction, replace or repair the voltage regulator
as necessary.
7. POOR VOLTAGE STABILITY.
Step 1.
Verify that the generator frequency is stable.
If the frequency is unstable, consult with the governor manufacturer.
If the frequency is stable, proceed to step 2.
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