TROUBLE SHOOTING
26 July 2009 / WHISPER 6/8/11 / US / Copyright © 2009 Mastervolt
Problem Possible cause What to do?
• Defective diode (one of the two)
Check the diodes in the rotor and replace
(refer to special procedures).
• Generator is overloaded.
Switch off a load; (part off) consumers.
• Engine is not reaching the rated RPM.
Refer to engine RPM problems
• Defective capacitor
Check capacitor and replace if necessary
(refer to special procedures).
Generator output voltage too
low under load (less than
105V/210V).
In no load condition it is ok
• Defective voltage regulator (Optional
for Whisper 8 and Whisper 11)
Replace voltage regulator
• Engine is running too fast (RPM too
high).
Check engine speed and adjust (refer to
special procedures).
• Over-energising due to defective
capacitors
Check capacitor specification and replace
capacitors if necessary.
• Presence of a strong capacitive load
(leading power factor)
Compensate for this capacity and seek for
experts advice (MASTERVOLT customers
service)
Generator voltage too high,
(more than 130V / 250V)
• Defective voltage regulator (Optional
for Whisper 8 and Whisper 11)
Replace voltage regulator
• Disturbances on the electrical system/
user side.
Check if electrical load is fluctuating Generator voltage fluctuates.
• Engine runs irregularly.
When engine runs irregularly refer to section:
"Engine runs irregularly".
Generator is not able to start an
electric motor
If the generator is unable to supply
enough power to start an AC electric
motor, this is usually because this motor
draws too much current during starting
Check the electric motor’s current draw
required for starting. This should not exceed
the rated generator peak output current. This
could be remedied by providing stronger
capacitors to the motor or using a "soft-start".
Inquire at your nearest Mastervolt dealer or
directly at the manufacturer, Mastervolt in the
Netherlands.
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