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6. ELECTRIC MOTOR TROUBLESHOOTING
• Make sure that you contact us or our sales service agency for the actions indicated in parentheses in the
Actions field.
• Ask our sales service agency for repair if you suspect other abnormality or causes than those given
below.
Abnormal Phenomenon Major Cause(s) Actions
The motor remains off despite
the switch being turned to the
“START” position.
• Improper wiring and power supply
error
• The Inverter unit breakers: OFF
• A break in stator winding
• Check wiring, see “Engine &
Electric Motor Spec. 4. Operation”.
• Turn ON the breakers.
(• Inspection, repair, replacement)
(• Inspection, repair, replacement)
The motor comes to a stop
during use.
• Inverter unit error
(Red lamp: ON)
• 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 cabtyre cable rises in
temperature.
• Considerable voltage drop
• Ensure that the power supply
voltage of power supply equipment
is at a specified value.
• Replace the cabtyre cable with
one adhering to specifications.
An abnormal noise and
vibration are present in the
power unit during operation.
• A break in motor winding
• Looseness in the motor and pump
fixing bolt
• Looseness in the coupling fixing
bolt
• 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. See “Engine & Electric
Motor Spec. 4. Operation" .
(• Replacement)
• Clean and replace the strainer
and element according to periodic
inspection.
The power unit rises in
temperature during operation.
• High ambient temperature
• Ill-ventilated
• Considerable voltage drop
• Overload
• High number of starts
• Use the power unit in environment
compliant with specifications.
• Perform inspection and cleaning,
See “Engine & Electric Motor
Specifications 4. Operation".
• Replace the cabtyre cable with
one adhering to specifications.
• Reduce loads.
• Reduce the number of starts.
The leak detector of the
Inverter unit main breaker is
tripped.
• High humidity
• Presence of water droplets
• Ill-grounded
• A break in stator winding
• Use the leak detector in
environment compliant with
specifications.
• Attach the cover properly.
• Adhere to ground standards.
(• Inspection, repair, replacement)
The trouble lamp (red) of the
Inverter unit comes on.
• Failure in the Inverter unit (• Inspection, repair, replacement)
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