Filter
Top Products
7 - 32
7 Troubleshooting
MITSUBISHI CNC
(Note) Alarm 6F is detected at the same time other power supply alarms occur.
Alarm No.
6E
Power supply: H/W error/AD error
An error was detected in the internal memory or A/D converter.
Investigation details Investigation results Remedies CV
1 Check the repeatability.
The alarm occurs each time READY is turned
ON.
Replace the unit.
◯
The alarm occurs occasionally. Check the investigation item No. 2.
2
Check if there is any abnormality in the unit's
ambient environment.
(Ex. Noise, grounding, etc.)
Take remedies according to the causes of the abnormality in the ambient environment.
◯
Alarm No.
6F
Power supply error
No power supply is connected to the drive unit, or a communication error was detected.
Investigation details Investigation results Remedies CV
1 Check the LED display on the power supply unit.
"F" is flickering.
An A/D converter error has occurred.
Check the alarm No. "6E" items.
◯
Another alarm code is flickering. Check items of each alarm No.
"0" is displayed. Check the investigation item No. 2.
"F" is displayed. Check the investigation item No. 2.
"8" is displayed. Check the alarm No. "68" items.
"b", "C", "d" is displayed. Check the investigation item No. 3.
Something else is displayed. Check the alarm No. "68" items.
2 Check the rotary switch setting.
0 or 4 is set. Check the investigation item No. 3.
◯
A value other than the above is set. Correctly set the rotary switch.
3
Check the communication cable (CN4) connected
with the drive unit.
There is a problem with the wiring or shield. Replace the cable.
◯
There is no problem. Replace the unit.
Alarm No.
70
Power supply: External emergency stop error
A mismatch of the external emergency stop input and CNC emergency stop input continued for 30 seconds.
Investigation details Investigation results Remedies CV
1
Check the connection between external emergency
stop and NC emergency stop.
Not wired.
Correctly wire the external emergency stop
and NC emergency stop.
◯
2
Check if there is any abnormality in the unit's
ambient environment.
No abnormality is found in particular. Replace the drive unit.
◯
The grounding is incomplete.
Take remedies according to the causes of
the abnormality. Additionally ground and
review.
Alarm No.
71
Power supply: Instantaneous power interruption
The power was momentarily interrupted.
Investigation details Investigation results Remedies CV
1
Investigate the sequence to check whether the
contactor has been turned OFF with an emergency
stop button, etc.
The contactor has been turned OFF
externally.
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.
◯
The contactor has not been turned OFF. Check the investigation item No. 2.
2 Check the repeatability.
The alarm occurs each time READY is turned
ON.
Check the investigation item No. 3.
◯
The alarm occurs at a certain operation.
Check the investigation item No. 1.
If there is no problem, check the investigation
item No. 3.
The alarm occurs occasionally during
operation.
Check the investigation item No. 4.
3
Check whether the power input wire and contactor
are correctly wired.
The wiring is incorrect. Correctly connect.
◯
There is no problem. Check the investigation item No. 4.
4
Check the power voltage waveform with a
synchroscope.
An instantaneous power failure or voltage
drop occurs frequently.
Correct the power facility.
◯
There is no problem. Replace the unit.