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MITSUBISHI CNC
Appendix 2 Explanation of Alarms
Grounding
Alarm No.
24
The motor power cable is in contact with FG (Frame Ground).
Investigation details
Measure the insulation across the
power cables (U,V,W) for connected
motors and the ground. (Carry out a
1
megger test.)
(Note)
When the insulation is measured,
disconnect wires from the drive unit.
Has oil come in contact with the motor
2
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 ground with
4
a tester.
(Note) Do not measure the insulation
as the unit is damaged.
Alarm No.
Absolute position data lost
25
The absolute position was lost, as the backup battery voltage dropped in the absolute position detector.
Investigation details
Is warning 9F occurring at the same
1
time?
Measure the battery voltage with a
2
tester at the DC range.
Did alarm No.18 occur when the
3
power was turned ON the last time?
Was the detector cable or battery
4
cable left disconnected from the unit
for a long time?
Check the detector cable or battery
5
cable connection with a tester.
Unused axis error
Alarm No.
26
A power module error occurred in the axis whose axis No. selection switch was set to "F" (free axis).
Investigation details
1 Check the repeatability.
Check if there is any abnormality in the
unit's ambient environment.
2
(Ex. Ambient temperature, noise,
grounding)
614
Investigation results
Less than 1M .
1M
or more.
Oil has come in contact.
Oil has not come in contact.
Less than 1M .
1M
or more.
Less than 100k .
100k
or more.
Investigation results
The warning is occurring.
The warning is not occurring.
Less than 3V.
3V or more.
Alarm No.18 occurred.
Alarm No.18 did not occur.
The unit was left disconnected for a
long time.
Guide at delivery: 20 hours or more
After 5 years: 10 hours or more
The cables were not left disconnected. Check the investigation item No. 5.
The connection is faulty.
The connection is normal.
Investigation results
The error is always repeated.
The state returns to normal once, but
occurs sometimes thereafter.
Take remedies according to the causes of the abnormality in the ambient
environment.
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. 4.
Replace the drive unit.
Replace the power supply unit.
Remedies
Check the investigation item No. 2.
Check the investigation item No. 3.
Replace the battery, and establish the
zero point.
Check the NC bus cable connection.
Turn the drive unit control power ON
again, and establish the zero point.
Check the investigation item No. 4.
Turn the drive unit control power ON
again, and establish the zero point.
Replace the cable.
Replace the drive unit.
Remedies
Replace the drive unit.
Check the investigation item No. 2.
SV SP
SV SP
SV SP
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Troubleshooting
