Engine - Kubota WSM J Series Workshop Manual

J SERIES, WSM
(B) Voltage Faults (Single Phase)
Trouble Checking Method
Voltmeter Measure the voltage
indicates at the output terminal
normal using a circuit tester.
voltage but 250 V at AC range
no output
voltage is
delivered.
Voltmeter Same as above.
does not Set the circuit
indicate any breaker to ON.
voltage and
also output
voltage is not
delivered.
NFB Same as above.
goes OFF.
Rated Check the variation
output is of engine revolution or
not frequency when
available. engine is loaded or
not.
Same as above.
Measurement
Operating Possible Cause
Condition
Output voltage Circuit breaker (NFB) is
is 0 V. OFF.
Improper contact of NFB
or each terminal.
Disconnected wiring
(inside the control box).
Output voltage Disconnected main coil.
is 0 V.
Disconnected wiring.
Only slight Disconnected rotor coil.
output voltage
Excessive wear of brush
is delivered
or improper contact of it.
2 to 4 V
Defective slip ring.
(100 to 120 V)
Disconnected exciter coil
4 to 8 V
(220 to 240 V).
Defective A.V.R..
Disconnected battery.
Output Abnormality of loading
voltage is circuit.
normal 95 to
114 % of rated
Improper connection of
voltage.
jumper plate.
Variation of Defective capacitor with
engine speed A.V.R..
is normal
Improper contact of
(within 10 %).
A.V.R. connector.
Defective brush and slip
ring.
Variation of Initial current is excess.
engine speed
is excessive
Lowered engine output.
(10 % more).
Defective engine
governor.
Output Short-circuit of main coil
voltage is 80 % or sub coil.
of rated output
or less.
Output Short-circuit of rotor coil.
voltage is more
Defective A.V.R..
than 130 % of
rated output.
S-5
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.
Repair or replace
Check wiring repair
Repair or replace
Repair or replace
Repair or replace
Replace brush and clean
the contact surface of it
Repair or replace
Replace
Connect battery
Locate the cause (Short-
circuit overloaded etc.)
and remove it.
Correct the connection
Replace A.V.R..
Repair
Cleaning, repair, replace
Locate the cause and
remove it
Repair engine
Repair engine
Repair or replace
Repair or replace
Replace
W1197220
KiSC issued 10, 2016 A