TROUBLE SHOOTING
30 Copyright © 2008 Mastervolt / December 2008 / Whisper 12 Ultra - Three phase 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.
These measurements should only be carried out by an
experienced electrician
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.
If the bottom speed is set at too low a frequency, the
generator may be damaged. On the other hand too high a
frequency can cause voltage drops with high loads.
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
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