Kubota WSM J Series Workshop Manual page 53

J SERIES, WSM
Trouble Checking Method
Circuit Use a circuit tester
breaker and measure the
goes OFF. phase voltage
between output
terminals inside
the generator.
Rated
output is
not
provided.
Measure the
engine speed
variation or
frequency
variation at no
load and in loaded
state.
Greater Use a circuit tester
difference and measure the
between phase voltage
phase between output
voltages. terminals inside
the generator.
Measurement
Operating Possible Cause
Condition
Normal Abnormality in load
output circuit.
voltages for
Open-phase overload or
all three
open-phase short-circuit.
phases.
Defective circuit breaker.
All three A.V.R. failure.
phases are
Partial discontinuity or
normal at no
short circuit of sub-coil.
load.
Partial short circuit in
The output
rotor coil.
voltage drops
abnormally
Partial short circuit in
when loaded.
output coil.
Abnormally Defective contact of
high output A.V.R.
voltages for connector.
all three
A.V.R. failure.
phases 250 V
or more
(phase voltage).
Variation of A.V.R. failure
engine speed
Defective contact of
is normal.
A.V.R. connector.
Defective brush contact.
Variation of Excessive initial current.
engine speed
is excessive.
Lowered engine output.
Defective engine`s
governor.
8 V or greater Abnormality in load.
difference
Abnormality in output
between
coil.
phase voltages.
S-7
GENERAL
Countermeasure
Set the circuit breaker to
ON after removing
abnormality (overlord,
short-circuit, etc.) in load
circuit.
Replace
Replace
Repair or replace the
stator.
Repair or replace the
rotor.
Repair or replace the
stator.
Inspect and repair.
Replace
Replace
Inspect and repair.
Inspect and clean the
brush contact surface, or
repair or replace the
brush.
Inspect and remove the
cause (overload,short
circuit, etc.).
Repair the engine
Repair the engine
Remove the cause
Repair or replace
W1205916
KiSC issued 10, 2016 A