Onan MDKBH Series, Service Manual

Page: 79 / 90

11-8
TABLE 11-1. 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
HIGH AC FREQUENCY—CODE NO. 14
Control Logic: After the starter was engaged Frequency jumped to more than 70 Hz for 40 milliseconds or
to more than 2percent over nominal for 6 seconds
Corrective Action:
1. Check for a tripped genset circuit breaker, reset it if necessary, and run with fewer connected loads. (A
breaker tripping under load can cause genset frequency to overshoot.)
2. Check all fuel filters and fittings for fuel and air leaks, tighten as necessary and reprime. (Air bubbles
can disrupt frequency.)
3. Check for proper operation of the governor actuator and service as necessary (p. 6-7).
4. Check for proper operation of the internal governor mechanism in accordance with the engine Work-
shop Manual (p. 6-1).
5. Replace the genset genset controller (p. 9-1).
Redistribution or publication of this document,
by any means, is strictly prohibited.