Mitsubishi Electric C70 Setup Manual page 595

MITSUBISHI CNC
Appendix 2 Explanation of Alarms
Alarm No.
Power supply: Frequency error
62
The input power supply frequency increased above the specification range.
Investigation details
Check the state of the operation when the
1
alarm occurs, and check the repeatability.
Measure the power voltage waveform
2
during normal operation.
Measure the power voltage when the motor
3
is accelerating/decelerating.
Check if there is any abnormality in the
4 unit's ambient environment.
(Ex. Noise, grounding, etc.)
Alarm No.
Process error
66
An error occurred in the process cycle.
Investigation details
1 Check the repeatability.
Check if there is any abnormality in the
2 unit's ambient environment.
(Ex. Noise, grounding, etc.)
Alarm No.
Power supply: Phase interruption
67
An open-phase condition was detected in input power supply circuit.
Investigation details
1 Check the voltage for each input phase.
2 Check the alarm No. "71" items.
Alarm No.
Power supply: Watchdog
68
The system does not operate correctly.
Investigation details
1 Check the repeatability.
Check if there is any abnormality in the
2 unit's ambient environment.
(Ex. Noise, grounding, etc.)
578
Investigation results
The alarm occurs each time immediately
after the power is turned ON. Or, the alarm
occurs occasionally regardless of the
operation state.
The alarm occurs only while the motor is
accelerating/decelerating.
The frequency is deviated from 50Hz ± 3%
or 60Hz ± 3%.
The voltage waveform dips at some
sections.
There is no problem.
The frequency greatly fluctuates during
acceleration/deceleration.
The voltage waveform during deceleration
dips in some sections.
There is no problem.
Take remedies according to the causes of the abnormality in the ambient environment.
Investigation results
The alarm occurs each time after the power
is turned ON.
The alarm occurs occasionally.
Take remedies according to the causes of the abnormality in the ambient environment.
Investigation results
There are phases with no voltage.
There is no problem.
Investigation results
The alarm occurs each time READY is
turned ON.
The alarm occurs occasionally.
Take remedies according to the causes of the abnormality in the ambient environment.
Remedies
Check the investigation item No. 2.
Check the investigation item No. 3.
Review the power facilities.
Improve the source of the distortion.
Install an AC reactor.
Check the investigation item No. 4.
Review the power facilities.
Improve the source of the distortion.
Install an AC reactor.
Check the investigation item No. 4.
Remedies
Replace the unit.
Check the investigation item No. 2.
Remedies
Correct the power supply.
Check the investigation item No. 2.
Remedies
Replace the unit.
Check the investigation item No. 2.
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