9-6
TABLE 9-1. TROUBLESHOOTING GENSET FAULTS (CONT.)
Some genset service procedures present hazards that can result in severe personal
injury or death. Only trained and experienced service personnel with knowledge of fuels, electricity,
and machinery hazards should perform genset service. See Safety Precautions.
Accidental or remote starting can cause severe personal injury or death. Before removing a panel or
access door, disconnect the negative (−) cable from the battery to prevent the engine from starting.
WARNING
LOW AC VOLTAGE—CODE NO. 13
(After voltage regulation was enabled Output Voltage fell to less than 90% of rated for 5 seconds)
Corrective Action:
1. Push the genset line circuit breaker OFF and disconnect the PTO, if so equipped. If the genset
now runs and voltage and frequency are normal, reduce the number of electrical and mechanical
(PTO) loads.
2. Check the fuel tank and fill as necessary. (Note: The arrangement of pickup tubes in the fuel supply
tank probably is such that the genset will run out of fuel before the propulsion engines.)
3. Check all fuel fittings and filters for fuel and air leaks and tighten as necessary. (Air bubbles can
disrupt genset frequency/voltage.)
4. Replace fuel filters (p. 4-6).
5. Push the genset line circuit breaker OFF and de-energize the PTO clutch, if so equipped. If the
genset now runs and voltage and frequency are normal, reduce the number of electrical and me-
chanical (PTO) loads. If there is no voltage, test for grounded or shorted main, field or quadrature
windings and service as necessary (p. 7-2).
6. Replace the genset controller (p. 5-1).
HIGH AC FREQUENCY—CODE NO. 14
(After the starter was engaged Frequency jumped to more than 70 Hz
for 40 milliseconds or to more than 2% over nominal for 6 seconds)
Corrective Action:
1. Check for a tripped genset circuit breaker, reset if necessary, and run with fewer loads. (A breaker
tripping under load can cause genset frequency to overshoot.)
2. Check all fuel fittings and filters for fuel and air leaks and tighten as necessary. (Air bubbles can
disrupt frequency.)
3. Check for proper operation of the governor actuator and replace if necessary (Page 5-9).
4. Check for proper operation of the internal governor mechanism. See Table 6-1 for the appropriate
engine workshop manual.
5. Replace the genset controller (p. 5-1).
Redistribution or publication of this document,
by any means, is strictly prohibited.
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