BENSHAW RSi SG Series, Instruction Manual

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Chapter 7 – Trouble Shooting & Maintenance
7-3
7.2 Fault Remedy
Protective
Function
Cause Remedy
Over Current
Protection 1
1) Acceleration/Deceleration time is too short compared to the
inertial of the load.
2) Load is larger than the drive rating.
3) Drive turned output on when the motor is still rotating.
4) Output short or ground fault has occurred.
5) Mechanical brake on the motor is engaging too fast before the
drive has actually turned off.
6) Components of the main circuit have overheated due to a faulty
cooling fan or blocked cooling.
7) Power factor capacitors or other filters are connected to output
of drive. 1) Increase Accel or Decel time.
2) Increase drive capacity.
3) Operate only after motor has
completely stopped or use speed
search function.
4) Check output wiring for shorts and
ground faults.
5) Check mechanical brake operation.
6) Check cooling fan.
7) Remove capacitors or filters from
output of drive.
Caution: Operating the drive prior
to correcting the original cause of
this fault may result in damage to
the power section’s IGBTs.
Ground Fault
Current Protection
1) A Ground fault has occurred in the output wiring of the drive.
2) A Ground fault has occurred in the motor. 1) Check the output wiring of drive for
shorts.
2) Test and/or exchange motor.
Over Voltage
Protection
1) Deceleration time is too short compared to the inertia of the
load
2) Regenerative load
3) Line voltage too high
4) Output Short Circuit
1) Increase deceleration time.
2) Use dynamic braking /regenerative
resistor option if load is
regenerative.
3) Check line voltage. Verify drive
input voltage rating is correct.
Reduce input voltage if necessary.
4) If OV Fault occurs immediately on
start command, check output for
short circuit.
Overload
1) Current ouput is larger than the overload settings.
2) Load is larger than drive rating.
3) Incorrect drive capacity selected.
4) Incorrect V/F pattern or control mode set. 1) Verify settings in FUN-66, 67 and
68.
2) Increase capacity of motor and/or
drive.
3) Select correct drive capacity.
4) Select correct V/F pattern or control
mode.
Overheat
1) Cooling fan damaged or a foreign substance is blocking fan(s).
2) Foreign substance blocking heatsink.
3) Ambient temperature high.
4) Switching Frequency is too high for given loading and ambient
condition.
1) Exchange cooling fans and/or
eliminate foreign substance.
2) Check for foreign substances
blocking heat sink.
3) Keep ambient temperature under 40
C.
4) Reduce PWM carrier frequency.