TROUBLE SHOOTING
EN / WHISPER 12 Ultra - Three phase for mobile applications / December 2008 / Copyright © 2008 Mastervolt 31
5.1.2 Trouble shooting table alternator
PROBLEM CAUSE SOLUTION
• Circuit breaker "off" or faulty main fuse
• Faulty fuse of the AVR
Check switches and fuses and measure
directly on the alternator to exclude external
causes. Check fuse of the AVR
• 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).
• Faulty AVR
Check by independent excitation if the problem
is in the AVR or in the windings and replace
AVR if necessary (see special procedures).
No output (Voltage) at all
• Rotor diodes broken.
Check the diode in the rotor (refer to special
procedures). The Whisper 12 ULTRA Three
Phase has six diodes in the rotor.
• Engine is not reaching the rated RPM. Refer to special procedures to readjust RPM.
• Faulty AVR. When slightly too low,
adjustment could be necessary
Try to readjust AVR. Check by independent
excitation if the problem is in the AVR or in the
windings and replace AVR if necessary (see
special procedures).
Generator output voltage too
low when no load is on it (less
than 225V between phase and
neutral).
• Defective diode
Check the diode in the rotor and replace (refer
to special procedures).
• Unbalanced load; check the voltage of
the other phases. When the voltages
are different this is caused by an
unbalanced load.
Bring load in balance. When slightly out of
balance, remove the sense wires to the phase
with the highest load and check if the voltage
on the other phases is not too high.
• Engine is not reaching the rated RPM.
Possibly too much load or engine
problems (lack of fuel)
Switch off a load; (part off) consumers
See to engine RPM problems
Generator output voltage too
low under load (less than 225V
between phase and neutral).
In no load condition it is OK
• Faulty AVR or readjustment necessary
Try to readjust the voltage
Check by independent excitation if the problem
is in the AVR or in the windings and replace
AVR if necessary (see special procedures).
Generator output voltage too
high without load, (more than
235V between phase and
neutral)
• Over-energising due to defective AVR
or wrong AVR setting
Check AVR, readjust and replace AVR if
necessary (see special procedures)..
Generator output voltage too
high with load, (more than 235V
between phase and neutral)
In no load condition it is OK
• Unbalanced load
Bring load in balance.
When slightly out of balance, remove the
sense wires to the phase with the highest load
and check if the voltage on the other phases is
not too low.
• Disturbances on the electrical system/
user side.
Check if electrical load is fluctuating
• AVR reacts on fluctuating load
Do not apply strong fluctuating loads
Generator voltage fluctuates.
• Engine runs irregularly.
When engine runs irregularly see section:
"Engine runs irregularly" at the “Engine faults”
paragraph.
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 using a "soft-start".
Inquire at your nearest Mastervolt dealer or
directly at the manufacturer, Mastervolt in the
Netherlands.
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