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