36
Troubleshooting
Fault code 35, MOTOR SHORT CIRCUIT
This fault code is generated by the motor control. The motor control reads
the power consumption of the motor continuously. If the current for some
reason gets too high (= exceeds a certain limit), the motor control will cut
the current to the motor. After the motor has stopped (= tachometer indi
-
cates stationary motor), the motor control will attempt to restart it. If the
motor control then detects high motor current again, the ”Short circuit
motor” fault code will be activated. If on restarting after a first short circuit,
the motor control rotates normally, a fault code will not be activated.
This fault code can be activated for a number of reasons:
• Short circuit in motor
• Short circuit internally in motor winding (impaired efficiency, higher cur
-
rent consumption)
• Short circuit in motor cables
• Short circuit in connectors
• Drops of water causing short circuits in the motor connector
• Short circuit in the motor control output transistors
• Bad contact in tacho signal
• Bad contact in interlock signal
Actions:
If the fault is a stable one, it is generally not difficult to locate the defective
unit through resistance measurement and testing with the service program.
Further information can be obtained by studying the contents of ”MCU
FAULT LOGGER”. Study the following:
• SHORT CIRCUIT 2 (specifies how many times fault code 35 has been
active)
• SHORT CIRCUIT 1 (specifies how many times the current limit has been
exceeded. The difference between short circuit 1 and short circuit 2
indicates how many times there has been a short circuit 1 that has not
been confirmed when restarting the motor).
• LAST FAULT CODE N/8 (shows the 8 latest fault codes)
• TACHO CUT-OUT LOW RPM (can give a clue in case of intermittent
faults)
• TACHO CUT-OUT HIGH RPM (can give a clue in case of intermittent
faults)
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