11-13
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
FIELD OVERLOAD—CODE NO. 38
Control Logic:
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 grill and right side, if enclosed.
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. Check for a loose generator fan (p. 8-3) and repair or replace as necessary.
5. Service the brushes and slip rings as necessary (p. 8-4) and test the generator field, stator and quadra-
ture windings for opens and shorts (p. 8-5). Replace a stator or rotor with faulty windings.
GENERATOR ROTOR FAULT—CODE NO. 41
Control Logic:
F+ grounded
Corrective Action:
Refer to Pages A-1 through A-3 as appropriate.
1. Disconnect connector
P3
(green) from the genset controller and check for continuity between Pin
P3-7
(F
+
) and
B–
(ground).
Pin P3-7 should not be grounded.
Repair or replace wiring, brushes and slip
rings (Page 8-4) or rotor (Page 8-5), as necessary.
2. Replace the genset controller (p. 9-1).
CONTROL CARD FAILURE–RAM—CODE NO. 43
Control Logic:
During startup the genset Controller detected a RAM memory error
Corrective Action:
Replace the genset controller (p. 9-1)
SPEED SENSE LOST—CODE NO. 45
Control Logic:
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-3 as appropriate.
1. Disconnect connector
P3
(green) from the genset controller and check for open or shorted field
(
P3-6—P3-7
) or quadrature (
P3-4—P3-5
) windings (p. 8-5). Service or replace brush block, slip rings,
rotor or stator as necessary.
2. Replace the genset controller (p. 9-1).
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Summary of Contents for MDKBH Series
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