Trouble Shooting; Alternator Malfucntions / Ac Trouble; General; Trouble Shooting Check List Alternator - Mastervolt WHISPER 9,5 ULTRA User Manual

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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
5.1.2 Trouble shooting table
PROBLEM
No output (voltage) at all.
Generator output voltage too
low when no load is on it
(less than 210-105V).
Generator output voltage too
low under load (less than 210V).
In no load condition
it is ok.
Generator voltage too high,
(more than 250/130V).
USA / WHISPER 15 ULTRA / May 2004
CAUSE
• Circuit breaker "off" or faulty fuse
• Low engine RPM.
• Loss of residual magnetism.
• Capacitor loose or broken.
• Rotor diodes broken.
• No load at all or very low load.
• Engine is not reaching the rated RPM.
• Defective capacitor.
• Defective diode (one of the two)
• Generator is overloaded.
• Engine is not reaching the rated RPM.
• Defective capacitors.
• Defective voltage regulator (Optional)
• Defective electronic governor actuator
controlbox or pickup Whisper 10
• Engine is running too fast (RPM too high).
• Over-energising due to defective
capacitors.
• Presence of a strong capacative load
(leading power factor).
• Defective voltageregulator
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.
SOLUTION
Check switches and fuses and measure direct-
ly on the alternator to exclude external causes.
Check the engine RPM and adjust (refer to
special procedures).
Check the residual magnetism and flash the
alternator (refer to special procedures).
Check by independent excitation if the problem is
in the capacitors or in the windings.
Check the diode in the rotor (refer to special
procedures) The Whisper 9,5 / 12,5 ULTRA has
one diode in the rotor.
Switch on a load and check voltage.
Refer to special procedures to readjust RPM.
Check capacitor and replace if necessary (refer
to special procedures).
Check the diodes in the rotor and replace (refer to
special procedures).
Switch on a load.
Switch off a load; (part off ) consumers.
Refer to engine RPM problems.
Check capacitors and replace if necessary (refer
to special procedures).
Replace voltage regulator.
RPM will be too low as well
Replace faulty part
Check engine speed and adjust (refer to special
procedures).
Check capacitors specification and replace if
necessary.
Compensate for this capacity and seek for experts
advice.(MASTERVOLT customers service).
Replace voltage regulator
TROUBLE SHOOTING
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