9-12
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
FIELD OVERLOAD—CODE NO. 38
(High field voltage induced by high rotor temperature or low power factor loads)
Corrective Action:
1. Remove blockages to generator air flow at the front inlet air grill.
2. Reduce the number of appliances running at the same time, especially those with high motor starting
loads, such as air conditioners.
3. Have air conditioners and other appliances checked for proper operation. (A locked compressor
rotor can cause very low power factor.)
4. Test and service the generator as necessary (Page 7-2).
CONTROL CARD FAILURE−RAM—CODE NO. 43
(During startup the genset Controller detected a RAM memory error)
Corrective Action: Replace the genset controller (p. 5-1).
SPEED SENSE LOST—CODE NO. 45
(After start disconnect the genset Controller lost speed sense
[quadrature zero crossings] for 0.25 seconds)
Corrective Action: Refer to Pages A-1 through A-5, as appropriate.
1. Disconnect connector P3 (green) from the genset controller (p. 5-1) and check for open or shorted
field (P3-7 to P3-8) and quadrature (P3-4 to P3-5) windings. Service the generator as necessary
(Page 7-2).
2. Replace the genset controller (p. 5-1).
OVERPRIME—CODE NO. 57
(A local or remote control switch was held in the Prime position for more than 5 minutes)
Corrective Action:
1. Check for and remove any object that may be holding any control switch (local or remote) in the
prime position.
2. Replace any control switch (S4) in the control system that does not open across terminals 1 and 2
when Stop is released (p. 5-5).
Redistribution or publication of this document,
by any means, is strictly prohibited.
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