Mitsubishi Electric MDS-E Series Instruction Manual page 441

MDS-E/EH Series Instruction Manual
7 Troubleshooting
Alarm No.
Power supply: External emergency stop error
70
A mismatch of the external emergency stop input and CNC emergency stop input continued for 30 seconds.
Investigation details
Check the connection between external emergency
1
stop and NC emergency stop.
Check if there is any abnormality in the unit's
2
ambient environment.
Alarm No.
Power supply: Instantaneous power interruption
71
The power was momentarily interrupted.
Investigation details
Investigate the sequence to check whether the
1 contactor has been turned OFF with an emergency
stop button, etc.
2 Check the repeatability.
Check whether the power input wire and contactor
3
are correctly wired.
Check the power voltage waveform with a
4
synchroscope.
Alarm No.
Power supply: Fan stop
72
A cooling fan built in the power supply unit stopped, and overheat occurred in the power module.
Investigation details
Turn the unit power ON again, and confirm the
rotation of the fan.
Note) Assure more than 10 seconds for the time
from when the power is turned OFF till when it is
1
turned ON. For the fan used for the drive unit,
assuring more than 10 seconds for the time from
when the power is turned OFF till when it is turned
ON is required.
Check if the connector connected to a fan is
2
disconnected.
3 Check if oil or cutting chips are adhered to the fan.
IB-1501229-F
Investigation results
Not wired.
No abnormality is found in particular.
The grounding is incomplete.
Investigation results
The contactor has been turned OFF
externally.
The contactor has not been turned OFF.
The alarm occurs each time READY is turned
ON.
The alarm occurs at a certain operation.
The alarm occurs occasionally during
operation.
The wiring is incorrect.
There is no problem.
An instantaneous power failure or voltage
drop occurs frequently.
There is no problem.
Investigation results
The fan is rotating, and an alarm did not
occur again.
The fan did not rotate. Or, an alarm occurred
again.
The connector is disconnected.
The connector is not disconnected.
Oil or cutting chips are adhered.
Oil or cutting chips are not adhered.
The cable may be broken.
410
Remedies
Correctly wire the external emergency stop
and NC emergency stop.
Replace the drive unit.
Take remedies according to the causes of
the abnormality. Additionally ground and
review.
Remedies
Review the machine sequence.
When turning the contactor OFF with
external means, such as an emergency stop
button, this alarm can be avoided by inputting
NC emergency stop at the same time.
Check the investigation item No. 2.
Check the investigation item No. 3.
Check the investigation item No. 1.
If there is no problem, check the investigation
item No. 3.
Check the investigation item No. 4.
Correctly connect.
Check the investigation item No. 4.
Correct the power facility.
Replace the unit.
Remedies
Continue to use.
The power may be turned ON without
assuring more than 10 seconds for the time
from when the power is turned OFF till when
it is turned ON.
Leave for more than 10 seconds, and turn the
power ON again.
Check the investigation item No. 2.
Correctly connect the connector.
Check the investigation item No. 3.
Improve the use environment and replace
the drive unit.
Replace the drive unit.
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