Trouble Shooting Table Alternator - Whisper Power W-SQ12 User Manual

5.1.2

Trouble shooting table alternator

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)
Generator voltage fluctuates.
Generator is not able to start an
electric motor
EN / W-SQ12 for mobile applications / January 2009
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
• Generator is overloaded.
• Engine is not reaching the rated RPM.
• Defective capacitor
• Engine is running too fast (RPM too
high).
• Over-energising
due
capacitors
• Presence of a strong capacitive load
(leading power factor)
• Disturbances on the electrical system/
user side.
• Engine runs irregularly.
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
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 diode in the rotor (refer to special
procedures). The
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 diode 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).
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
service)
Check if electrical load is fluctuating
When engine runs irregularly refer to section:
"Engine runs irregularly".
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 providing stronger
capacitors to the motor or using a "soft-start".
Inquire at your nearest
or directly at the manufacturer,
in the Netherlands.
TROUBLE SHOOTING
W-SQ12 has one diode in
(Whisper Power customers
Whisper Power dealer
Whisper Power
27