Trouble Shooting; Alternator/ Electrical Faults; General; Trouble Shooting Table - Mastervolt whisper 6 ultra User Manual

TROUBLE SHOOTING

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
5.1.2

Trouble shooting table

PROBLEM
No output (Voltage) at all
Generator output voltage too
low when no load is on it (less
than 210V/105V)).
Generator output voltage too
low under load (less than
210V/105V).
In no load condition it is ok
Generator voltage too high,
(more than 245V/130V)
22
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.
• Defective capacitor.
• Defective diode (one of the two)
• Generator is overloaded.
• Engine is not reaching the rated RPM.
• Defective capacitor
• Defective voltage regulator
• Engine is running too fast (RPM too
high).
• Over-energising
due
capacitors
• Presence of a strong capacitive load
(leading power factor)
• Defective voltage regulator
breakers. Also check if measuring instruments give the
correct value. If in doubt, measure directly on the
alternator terminals with an independent instrument.
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 5% at full load is acceptable. Therefore a
no load setting should be at 1575 RPM = 52.5 Hz. Under
no circumstances should the RPM under full load be below
1470 RPM = 49 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. (Refer to page 24 par 5.2.1).
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 Whisper 6 ULTRA has one
diode in the rotor.
Switch on a load and check voltage.
Refer to special procedures to readjust RPM.
Check capacitor and replace if necessary
(refer to special procedures).
Check the diodes in the rotor and replace
(refer to special procedures).
Switch off a load; (part off) consumers.
Refer to engine RPM problems
Check capacitor and replace if necessary
(refer to special procedures).
Replace voltage regulator
Check engine speed and adjust (refer to
special procedures).
Check capacitor specification and replace
to defective
capacitors if necessary.
Compensate for this capacity and seek for
experts advice (MASTERVOLT customers
service)
Replace voltage regulator
May 2006 / WHISPER 6 ULTRA / EN