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Troubleshooting
TROUBLESHOOTING GUIDE
When troubles occur, be sure to check simple causes which, at fi rst, may seem too obvious to be considered. For
example, a starting problem could be caused by an empty fuel tank.
Some general common causes of generator troubles are listed below. Use these to locate causing factors.
Condition
No AC output
Alternator can't output
rated power
Alternator excitation
failure
High no load voltage
Low no load voltage
Proper voltage at no load
but low voltage at load
Proper voltage in no
load conditions but high
voltage at load
Unstable voltage
Noisy alternator
6
Possible Cause
Circuit breaker in OFF position.
Circuit protector popped out.
Engine not operating at rated RPM.
Circuit breaker or receptacles faulty.
Stator is faulty.
Engine not operating at rated RPM.
Overload condition.
Appliance is faulty.
Engine not operating at rated RPM.
Faulty capacitor.
Faulty windings.
Engine not operating at rated RPM.
High capacity of capacitor.
Engine not operating at rated RPM.
Faulty rotor diodes.
Worn windings.
Low capacity of capacitor.
Engine not operating at rated RPM.
Overload condition.
Short-circuited rotor diodes.
Engine not operating at rated RPM.
Loose contacts.
Uneven rotation.
Worn bearings.
Faulty coupling.
KohlerPower.com
Solution
Switch circuit breaker to ON.
Press circuit protectors.
Adjust engine running at normal operating
temperature to 3600 ± 100 RPM.
Test for voltage at circuit breaker and
receptacles.
Test for voltage and resistance.
Adjust engine running at normal operating
temperature to 3600 ± 100 RPM.
Calculate electrical power required by
electric appliances (in watts). Reduce total
wattage of connected electric devices
within application range.
Repair faulty appliance.
Adjust engine running at normal operating
temperature to 3600 ± 100 RPM.
Check and replace.
Check windings resistance.
Adjust engine running at normal operating
temperature to 3600 ± 100 RPM.
Check and replace.
Adjust engine running at normal operating
temperature to 3600 ± 100 RPM.
Check and replace.
Check winding resistance.
Check and replace.
Adjust engine running at normal operating
temperature to 3600 ± 100 RPM.
Calculate electrical power required by
electric appliances (in watts). Reduce total
wattage of connected electric devices
within application range.
Check and replace.
Adjust engine running at normal operating
temperature to 3600 ± 100 RPM.
Check connections.
Check for uniform rotation speed.
Replace.
Check and repair.
38 690 01 Rev. --
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