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11.4 ELECTRIC MOTOR
• Make sure that you contact us or our sales service agent for the actions marked with in the
table.
• Ask us or our sales service agency for repair if you suspect any other abnormalities or causes
than those given below.
Abnormal Phenomenon Major Cause(s) Remedy
Electric motor does not start even
after turning switch to the “START”
position.
• Improper wiring and
power supply error
• Inverter panel circuit
breakers are set to
“OFF” position.
• A break in stator
winding
• Check wiring according to
“Engine & Electric Motor
Spec. Operation”.
• Set all circuit breakers to
“ON” position.
Inspection, repair,
replacement
Inspection, repair,
replacement
The motor comes to a stop during
use.
• Inverter unit error
• Failure in the Inverter
unit
• Failure in the power
unit
• Check the power supply
source (voltage and phase
interruption).
Inspection, repair,
replacement
Inspection, repair,
replacement
The power output of the motor
reaches zero or undergoes gradual
decrease.
• Phase interruption in
the power source of
power supply
equipment
• Slack in motor wiring
• Check the power source of
power supply equipment
(voltage and phase
interruption).
• Inspect connection with the
motor Terminal block.
Inspection, repair,
replacement
The cabtire cable rises in
temperature.
• Considerable voltage
drop
• Ensure that the power
supply voltage of power
supply equipment is at a
specified value.
• Replace the cabtire cable
with one adhering to
specifications.
An abnormal noise and vibration are
present in the power unit during
operation.
• A break in motor
winding
• Loose fixing bolts on
the motor and pump.
• Loose coupling fixing
bolts
• Impurities on the
coupling
• Clogging in the
hydraulic oil tank
strainer and element
• Inspect the motor Terminal
block.
Inspection, repair,
replacement
• Perform inspection, repair,
and cleaning according to
“Engine & Electric Motor
Spec. Operation”.
Replacement
• Clean and replace the
strainer and element
according to periodic
inspection.
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