Mitsubishi Electric C70 Setup Manual page 589

MITSUBISHI CNC
Appendix 2 Explanation of Alarms
Motor side detector: Error 7
Alarm No.
The motor side detector (linear scale in the case of linear motor) detected an error.
4A
As details differ for each detector, refer to "Appendix 2.3.1" for the description of this alarm.
Investigation details
1 Check the alarm No. "1B" items.
Motor side detector: Error 8
Alarm No.
The motor side detector (linear scale in the case of linear motor) detected an error.
4B
As details differ for each detector, refer to "Appendix 2.3.1" for the description of this alarm.
Investigation details
1 Check the alarm No. "1B" items.
Alarm No.
Current error at magnetic pole estimate
4C
Current detection failed at the pulse-applied magnetic pole estimation by IPM spindle motor.
Investigation details
1 Check the pulse-applied time.
Alarm No. NC command mode error
4E
The mode outside the specification was input in spindle control mode selection.
Investigation details
Check the wiring and setting environment.
1) Correctly grounded?
2) Any noise generating devices around the
1
unit?
3) Are the speed/position detector cables
correctly shielded?
Alarm No. Instantaneous power interrupt
4F The control power supply has been shut down for 50ms or more.
Investigation details
1 Check the repeatability.
572
Investigation results
Investigation results
Investigation results
The pulse-applied time can be short.
The alarm also occurs after the pulse-
applied time is set.
Investigation results
1) The grounding is incomplete.
2) The alarm occurs easily when a specific
device operates.
3) The cable is not correctly shielded.
No abnormality is found in particular.
Investigation results
The alarm occurs occasionally.
Remedies
Remedies
Remedies
Set the pulse-applied time longer.
Setting parameter:SP142
1) The pulse-applied time (0 to 350)
2) For low-speed coil:1)+1000
3) The polarity of magnetic pole estimate:
Reverse polarity is "-"
After the adjustment, perform the magnetic
pole detection control again.
Replace the unit.
Remedies
Correctly ground.
Use noise measures on the device
described on the left.
Correctly shield the cable.
Replace the drive unit.
Remedies
Check the power facilities.
Check the wiring of the control power.
SV SP
SV SP
SV SP
-
SV SP
SV SP
-