USA / WHISPER 15 ULTRA / May 2004
23
TROUBLE SHOOTING
5 TROUBLE
SHOOTING
5.1 ALTERNATOR/
ELECTRICAL FAULTS
Take care for parts which are live!
Remove 3 Amp. fuse in the control panel
while working on the generator to prevent
the engine to start.
5.1.1
General
If any problem should occur check basic conditions and
examine all external wiring, switch gear and circuit
breakers. Also check if measuring instruments give the
correct value. If in doubt measure direct on the alternator
terminals with an independent instrument.
This should only be carried out by an experienced
electrician.
Check if the engine is running correctly at 1800 RPM (60
Hz) according to its settings and does as well under load.
A RPM drop of 5% at full load is acceptable. Therefore a
no load setting should be at 1875 RPM = 62.5 Hz . Under
no circumstances the RPM under full load should be
below 1770 RPM = 59 Hz.
When the problem is in the RPM refer to the engine fault
finding paragraph. Digital Diesel Control systemwill help
to indicate failures and display causes.
5.1.2
Trouble shooting table
PROBLEM
CAUSE
SOLUTION
No output (voltage) at all.
• Circuit breaker "off" or faulty fuse
Check switches and fuses and measure direct-
ly on the alternator to exclude external causes.
• Low engine RPM.
Check the engine RPM and adjust (refer to
special procedures).
• Loss of residual magnetism.
Check the residual magnetism and flash the
alternator (refer to special procedures).
• Capacitor loose or broken.
Check by independent excitation if the problem is
in the capacitors or in the windings.
• Rotor diodes broken.
Check the diode in the rotor (refer to special
procedures) The Whisper 9,5 / 12,5 ULTRA has
one diode in the rotor.
Generator output voltage too
• No load at all or very low load.
Switch on a load and check voltage.
low when no load is on it
• Engine is not reaching the rated RPM.
Refer to special procedures to readjust RPM.
(less than 210-105V).
• Defective capacitor.
Check capacitor and replace if necessary (refer
to special procedures).
• Defective diode (one of the two)
Check the diodes in the rotor and replace (refer to
special procedures).
Generator output voltage too
• Generator is overloaded.
Switch on a load.
low under load (less than 210V).
• Engine is not reaching the rated RPM.
Switch off a load; (part off ) consumers.
In no load condition
Refer to engine RPM problems.
it is ok.
• Defective capacitors.
Check capacitors and replace if necessary (refer
to special procedures).
• Defective voltage regulator (Optional)
Replace voltage regulator.
• Defective electronic governor actuator
RPM will be too low as well
controlbox or pickup Whisper 10
Replace faulty part
Generator voltage too high,
• Engine is running too fast (RPM too high).
Check engine speed and adjust (refer to special
(more than 250/130V).
procedures).
• Over-energising due to defective
Check capacitors specification and replace if
capacitors.
necessary.
• Presence of a strong capacative load
Compensate for this capacity and seek for experts
(leading power factor).
advice.(MASTERVOLT customers service).
• Defective voltageregulator
Replace voltage regulator
