Kubota WSM J Series Workshop Manual page 52

J SERIES, WSM
(C) Voltage Faults (Three Phase)
Trouble Checking Method
Voltmeter Measure the voltage
indicates at the output terminal
normal using a circuit tester.
voltage but
no output At AC range
voltage is 250 V or 500 V
delivered.
Terminals between
O and U,
O and V,
O and W.
Voltmeter Same as above.
does not Set the circuit
indicate breaker to ON.
any voltage
and also
no output
voltage is
delivered.
Measurement
Operating Possible Cause
Condition
Output voltage Circuit breaker (NFB) is
is 0 V for all OFF.
three phases.
Defective contact of
circuit breaker.
0 V for one Defective contact of
phase only. circuit breaker.
Two other
Discontinuity in one
phases are
phase.
normal.
0 V output Discontinuity in output
for all three coil.
phase.
Simultaneous shorting of
three phases.
0 V for one Discontinuity in one
phase only. phase.
Discontinuity in wiring.
Slight voltage Discontinuity in rotor coil.
output for all
three phases.
Wear or defective
2 to 4 V (phase
contact of brush.
voltage).
Discontinuity in sub-coil.
A.V.R. failure.
Disconnected battery.
S-6
GENERAL
Countermeasure
Set the circuit breaker to
ON. If it goes OFF again,
check the cause
(overload, short circuit,
etc.).
Set the circuit breaker to
ON after removing the
cause.
Replace
Replace
Repair or replace the
stator.
Repair or replace the
stator.
Inspect the stator or
wiring.
Repair or replace the
stator.
Repair
Repair or replace the
rotor.
Clean brush contact
surface and slip ring
surface, or replace the
brush.
Repair or replace the
stator.
Replace
Connect battery
W1198623
KiSC issued 10, 2016 A