Maeda MC285C-2 - Electric Motor Troubleshooting

6. ELECTRIC MOTOR TROUBLESHOOTING
• Make sure that you contact us or our sales service agency for the actions indicated in the Actions fields.
• Ask our sales service agency for repair if you suspect any other abnormalities or causes than those
given below.
Abnormal Phenomenon Major Cause(s) Actions
• Check w
iring, see “Engine &
Electric Motor Spec. 4. Operation”.
• Improper wiring and power supply
error
The motor remains off despite
the switch being turned to the
“START” position.
• Turn ON the breakers.
• The Inverter unit breakers: OFF
(• Inspection, repair, replacement)
• A break in stator winding
(• Inspection, repair, replacement)
• Ch
eck the power supply source
(voltage and phase interruption).
• Inverter unit error
(Red lamp: ON)
The motor comes to a stop
during use.
(• Inspection, repair, replacement) • Failure in the Inverter unit
• Failure in the power unit (• 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
• Check the power source of power
supply equipment (voltage and
phase interruption).
• Inspect connection with the motor
Terminal block .
• Slack in motor wiring
(• 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
• 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. See “Engine & Electric
Motor Spec. 4. Operation" .
(• Replacement)
• Clean and replace the strainer
and element according to periodic
inspection.
• Make
sure the power unit is
complying with the environmental
specifications.
The power unit rises in
temperature during operation.
• High ambient temperature
• Poor ventilation
• Considerable voltage drop
• Overload
• High number of starts
• 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
• Poor grounding
• A break in stator winding
• Use the leak detector in
environment compliant with
specifications.
• Attach the cover properly.
• Adhere to grounding 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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