Trouble Shooting; Alternator/ Electrical Faults; General; Trouble Shooting Table - Whisper Power M-SC6 User Manual

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
Failure code Problem
Communication error between the panel end the generator
COMMUNICATION
Starter battery voltage too low
LOW START BAT
No output battery charging voltage
ALTERNATOR
Exhaust temperature is too high
EXHAUST TEMP
Coolant temperature is too high
WATER TEMP
Oil pressure failure
OIL PRESSURE
Generator AC output voltage is either too high or too low
AC VOLTAGE
Generator is in overload
HIGH CURRENT
Output frequency of the generator is too low
FREQUENCY
5.1.2

Trouble shooting table

PROBLEM
No output (Voltage) at all
Generator output voltage too
low when no load is on it (less
EN / M-SC6/8/10 / December 2010
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.
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.
Check if the engine is running correctly at 3000 RPM (50
Hz) according to its settings and does as well under load.
•
M-SC6: A RPM drop of 5% at full load is
acceptable. Therefore a no load setting should be
at 3150 RPM = 52.5 Hz. Under no circumstances
should the RPM under full load be below 2940
RPM = 49 Hz.
•
M-SC8 and 10: A RPM drop of 1% at full load is
acceptable. Therefore a no load setting should be
at 3030 RPM = 50.5 Hz. Under no circumstances
should the RPM under full load be below 2970
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
SOLUTION
Check switches and fuses and measure
directly 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 capacitor or in the windings.
Check the diodes in the rotor (refer to special
procedures) The M-SC6/8/10 has one diode in
the rotor.
Switch on a load and check voltage.
Refer to special procedures to readjust RPM.
TROUBLE SHOOTING
27