Mitsubishi Electric MDS-E Series Instruction Manual page 439

MDS-E/EH Series Instruction Manual
7 Troubleshooting
Alarm No.
Power supply: Watchdog
68
The system does not operate correctly. LED display is fixed as "8".
Investigation details
1 Check the repeatability.
Check if there is any abnormality in the unit's
2 ambient environment.
(Ex. Noise, grounding, etc.)
Alarm No.
Power supply: Grounding
69
The motor power cable is in contact with FG (Frame Ground).
Investigation details
Measure the insulation across the power cables
1 (U,V,W) for all motors and the ground. (Carry out a
megger test.)
2 Has oil adhered on the motor or power cable?
3 Measure the insulation again.
Measure the resistance across the U, V, W phase
terminals of the servo/spindle drive unit and the
4 ground.
(Note) Do not measure the insulation as the unit is
damaged.
Check whether there is any axis in which alarm 24
5
has occurred.
Alarm No.
Power supply: External contactor welding
6A
A contact of the external contactor is welding.
Investigation details
Check whether any alarm has occurred on the drive
1
unit side.
2 Check whether the contactor's contact has melted.
Check that the contactor excitation wiring is
3 correctly connected from the power supply unit's
MC1 terminal.
Alarm No.
Power supply: Rush circuit error
6B
A thyristor for rush short circuit is ON when rushing.
Investigation details
Check whether any alarm has occurred on the drive
1
unit side.
2 Check the repeatability.
3 Check if there is any ground fault in the motor.
Check if there is any abnormality in the unit's
4 ambient environment.
(Ex. Noise, grounding, etc.)
IB-1501229-F
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.
Investigation results
Less than 1MΩ. (Grounding)
1MΩ or more. (Normal)
Oil has adhered.
Oil has not adhered.
Less than 1MΩ. (Grounding)
1MΩ or more. (Normal)
Less than 100k .
100k or more.
There is an axis in which alarm has occurred. Check the alarm No. "24" items.
There is no axis in which alarm has occurred. Check the investigation item No. 2.
Investigation results
An alarm has occurred.
An alarm has not occurred.
The contactor has melted.
The contactor has not melted.
The connection is correct.
The connection is incorrect.
Investigation results
An alarm has occurred.
An alarm has not occurred.
The alarm occurs each time READY is turned
ON.
The alarm occurs occasionally.
Check the investigation item of Alarm No. 69. Take remedies of Alarm No. 69.
No ground fault.
Take remedies according to the causes of the abnormality in the ambient environment.
408
Remedies
Replace the unit.
Check the investigation item No. 2.
Remedies
The motor or power cable may be ground
faulted.
Check the investigation item No. 2.
Take measures so that oil does not come in
contact. Check the motor's cannon connector
and the inside of the terminal box, and clean
as necessary.
Check the investigation item No. 3.
Replace the motor or cable.
Check the investigation item No. 2.
Replace the drive unit.
Replace the power supply unit.
Remedies
Remove the cause of the alarm on the drive
side, and check the investigation item No. 2.
Check the investigation item No. 2.
Replace the contactor.
Check the investigation item No. 3.
Correctly connect.
Replace the power supply unit.
Remedies
Remove the cause of the alarm on the drive
side, and then carry out the investigation
details 2.
Check the investigation item No. 2.
Replace the unit.
Check the investigation item No. 3.
Check the investigation item No. 4.
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