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Multiquip DCA40SSKU User Manual

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page 46 — DCa40sskU/kU4i 60 hz generaTor • operaTion anD parTs manUal — rev. #1 (03/11/13) 
trOuBlesHOOtinG (GeneratOr)
Practically  all  breakdowns  can  be  prevented  by  proper  handling  and  maintenance  inspections,  but  in  the  event  of  a 
breakdown, use Table 19 shown below for diagnosis of the Generator. If the problem cannot be remedied, consult our 
company’s business office or service plant.
When the Emergency/Malfunction shutdown system has been activated, the engine will be stopped and the pre-heat lamp  
will indicate the malfunction by a series of flashing patterns. The flashing patterns and corrective action are shown below 
in Table 20. The flashing patterns consist of combinations of one or more long flashes and one or more short flashes.
Table 19. generator Troubleshooting
symptom
possible problem
solution
No Voltage Output
AC Voltmeter defective?
Check output voltage using a voltmeter.
Is wiring connection loose?
Check wiring and repair.
Is AVR defective?
Replace if necessary.
Defective Rotating Rectifier?
Check and replace.
Defective Exciter Field?
Check and replace.
Low Voltage Output
Is engine speed correct?
Turn engine throttle lever to “High”.
Is wiring connections loose?
Check wiring and repair.
Defective AVR?
Replace if necessary.
High Voltage Output
Is wiring connections loose?
Check wiring and repair.
Defective AVR?
Replace if necessary.
Circuit Breaker Tripped
Short Circuit in load?
Check load and repair.
Over current?
Confirm load requirements and reduce.
Defective circuit breaker?
Check and replace.
Over current Relay actuated? Confirm load requirement and replace.
Table 20. engine/generator Troubleshooting (pre-heat lamp)
Type of Fault
possible Fault 
pre-heat lamp 
indication
solution
Engine Overspeed
115% or more rated RPM speed?
Long 1 Short 1
Check electronic governor
Low Oil Pressure
Oil pressure 7 psi (49 kPa) or 
greater?
Long 1 Short 2
Check oil level.
Insufficient Charge
No Voltage of Charging Genset?
Long 1 Short 3
Check wiring and repair.
High Water Temperature
Engine Overheat, 230° F (110° C)?
Long 1 Short 4
Check cooling system.
Engine Overheat, 248° F (120° C)?
Long 1 Short 6
Check cooling system.
Emergency Stop
Emergency Stop signal detected?
Long 1 Short 5
Check and repair fault 
Starter Motor Protection Starter motor run for 12 seconds 
or more?
Long 1 Short 7
Check wiring and repair.
Rotation Sensor
Defective sensor, short circuit?
Long 2 Short 1
Check wiring and repair.
Solenoid
Defective solenoid, short circuit?
Long 2 Short 2
Check wiring and repair.
Water Temperature 
Sensor
Disconnection
Long 2 Short 4
Check connection.
Short Circuit
Long 2 Short 5
Check sensor. Replace.
Charging Gen. Terminal Disconnection
Long 2 Short 6
Check connections.
Over Voltage
VCC 18 volts or greater
Long 3 Short 1
Check overcurrent relay.