M A E D A Mini-Crawler Crane Section 5 – TROUBLESHOOTING
1/2019 MC285C-3 5-91
Electric Motor
The motor remains off despite
the switch being turned to the
START position
Improper wiring and power
supply error
Main breaker and switches
are off
Turn on the breaker and the switches.
A break in stator winding
*Inspect, repair, replace.
The motor comes to a stop
during use
Inverter unit error (red lamp:
ON)
Check the power supply source (voltage
and phase interruption).
Failure in the inverter unit
*Inspect, repair, replace.
Failure in the electric unit
*Inspect, repair, replace.
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.
*Inspect, repair, replace.
The cabtyre cable rises in
temperature
Considerable voltage drop
Ensure that the power supply voltage of
power supply equipment is at the specified
value.
Replace the cabtyre cable with one
adhering to specifications.
Abnormal noise and vibration
are present in the electric unit
during operation
Inspect the motor terminal block.
Looseness in the motor and
pump fixing bolt
*Inspect, repair, replace.
Looseness in the coupling
fixing bolt
Perform inspection, repair and cleaning of
electric motor.
Impurities on the coupling
Clogging in the hydraulic oil
tank strainer and element
Clean and replace the strainer and
element according to periodic inspection.
The electric unit rises in
temperature during operation
Use the electric unit in environment
compliant with specifications.
Perform inspection, cleaning and repair of
electric motor.
Considerable voltage drop
Replace the cabtyre cable with one
adhering to specifications.
Reduce the number of starts.
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