© MOSA
1.0-07/98
PROBLEM
ASYNCHRONOUS
ALTERNATORS
No output
SYNCHRONOUS
ALTERNATORS
No outputMechanical
damage
Mechanical damage
TROUBLE SHOOTING
POSSIBLE CAUSE
1) GFI or Isometer (if installed) have
been activated
2) Thermal protection activated or fuse
burned out
3) Overload
4) Bad condenser or stator burned
out
1) Overload - circuit breaker activated
2) GFI or Isometer (if installed) have
been activated
3) Fuse burned out
4) Stator burned out
5) Carbon brushes worn out
6) Carbon brushes worn out
GE
WHAT TO DO
1) Reset GFI or Isometer. If they are
activated again check the cables and
tools attached to the auxiliary sockets
for short circuits or grounded leads
2) Reset the thermal protection and check
the fuses of the single phase sockets.
3) Disconnect the load and see if the
voltage is normal. If so the load caused
the generator to lose its excitation. This
can occur when the kWatt of the load is
larger than that of the generator or, in
the case of inductive loads (motors),
when the device has a high starting
current. In both cases the solution is a
larger genset.
4) Disconnect all leads from the stator
except for those going to the condenser
boxIf there is no output from the auxiliary
leads check the condenser box. If it is
OK replace the stator.
1) Remove the load and insert the circuit
breaker. Reconnect the load. If it
activates again check the rating of the
load and the wiring between load and
generator.
2) Remove the load and reset Isometer or
GFI. Check without the load. If they
activate there is an isolation fault or
leakage to ground in the generator or
internal wiring. If not, reconnect the load.
If they are activated with the load
attached there is an isolation fault or
leakage to ground in the load or related
cables.
3) Check the fuses of the single phase
sockets.
4) Disconnect the load and see if the
voltage is normal. If there is not output
replace the alternator.
5) Chek the condition of the brushes (if
mounted) and their position.
6) Worn out brushes can damage the brush
holder and/or collector.
M
40.2
