TROUBLE SHOOTING
28 Copyright © 2009 Mastervolt / December 2009 / Whisper 6 Ultra for mobile applications / EN
5 TROUBLE SHOOTING
5.1 ALTERNATOR/ ELECTRICAL FAULTS
Beware of parts which are live!
Remove 3 Amp. Fuse in the control panel
while working on the generator to prevent the
engine from starting
A failure code is displayed when a hardware failure at the
generator is detected
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 directly on the
alternator terminals with an independent instrument.
If during these measurements the engine immediately
stops after starting and an error code is displayed at the
remote control panel ( “AC VOLTAGE”), one can start the
generator by means of a “service start” at the service
menu (see paragraph “service start” of the user’s manual
of the Digital Diesel Control). By doing this, the generator
will keep running for 2 minutes before it stops. This offers
you the possibility to carry out measurements to
investigate the cause of the failure. This should only be
carried out by an experienced electrician.
Check if the engine is running correctly at 1500 RPM (50
Hz) according to its settings and does as well under load.
A RPM drop of 1% at full load is acceptable. Therefore a
no load setting should be at 1515 RPM = 50.5 Hz. Under
no circumstances should the RPM under full load be below
1485 RPM = 49.5 Hz.
When the problem is in the RPM refer to the engine fault
finding paragraph.
Digital Diesel Control system will help to indicate failures
and display causes.
Failure code Problem
COMMUNICATION Communication error between the panel end the generator
LOW START BAT Starter battery voltage too low
ALTERNATOR No output battery charging voltage
AC-ALTERN. TEMP AC-alternator temperature is too high
WATER TEMP Coolant temperature is too high
OIL PRESSURE Oil pressure failure
AC VOLTAGE Generator AC output voltage is either too high or too low
HIGH CURRENT Generator is in overload
FREQUENCY Output frequency of the generator is too low
5.1.2 Trouble shooting table alternator
PROBLEM CAUSE SOLUTION
x Circuit breaker "off" or faulty fuse
Check switches and fuses and measure
directly on the alternator to exclude external
causes.
x Low engine RPM.
Check the engine RPM and adjust (refer to
special procedures).
x Loss of residual magnetism.
Check the residual magnetism and flash the
alternator (refer to special procedures).
x Capacitor loose or broken.
Check by independent excitation if the problem
is in the capacitor or in the windings.
No output (Voltage) at all
x Rotor diodes broken.
Check the diode in the rotor (refer to special
procedures). The Whisper 6 ULTRA has one
diode in the rotor.
x No load at all or very low load.
Switch on a load and check voltage.
x Engine is not reaching the rated RPM.
Refer to special procedures to readjust RPM.
x Defective capacitor.
Check capacitor and replace if necessary
(refer to special procedures).
Generator output voltage too
low when no load is on it (less
than 210V/105V)).
x Defective diode
Check the diode in the rotor and replace (refer
to special procedures).
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