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10. Troubleshooting
10 - 9
Alarm No.
24
Grounding:
The motor power cable is in contact with FG (Frame Ground).
Cause of occurrence Investigation items Remedy
Check the motor power cable connection. Correctly connect.
1
Ground fault in motor power cable (U, V,
W phase).
Disconnect the motor's cannon plug,
and check the insulation across the
power cable and FG.
Replace the power cable.
2
Drive unit is faulty. Check the repeatability. If the problem is repeated, replace the
drive unit.
3
Ground fault in motor. Confirm that there is no ground fault in the
power cable, and without disconnecting
the cannon plug, check the insulation
across the power cable and FG.
Replace the motor.
(When using the absolute position
system, the zero point must be
established again.)
Check whether the motor is submerged
in cutting solution.
4
Motor is faulty.
Check whether the motor has been
subject to high temperatures.
Replace the motor and improve the
motor installation environment.
(When using the absolute position
system, the zero point must be
established again.)
Alarm No.
25
Absolute position data lost:
The absolute position was lost, as the backup battery voltage dropped in the absolute position detector.
Cause of occurrence Investigation items Remedy
Measure the battery voltage with a
tester. (Alarm occurs at 3V or less).
1
Battery voltage has dropped.
Does warning 9F occur at the same
time?
Replace the battery and establish the
zero point.
(The machine operation will not be
affected even if there is no battery as
long as the power is not turned OFF.)
2
Detector cable was disconnected while
power was OFF.
Did alarm 18 occur last time power was
turned ON?
Correctly connect the detector cable,
and establish the zero point.
3
Detector cable is broken. Check the detector cable continuity with
a tester.
Replace the cable and establish the
zero point.
Alarm No.
26
Unused axis error:
A power module error occurred in the axis whose axis No. selection switch was set to "F"(free axis).
Cause of occurrence Investigation items Remedy
1
CPU peripheral circuit operation is
incorrect.
Check for abnormalities in the unit's
surrounding environment, etc.
(Example: Ambient temperature, noise,
grounding)
Improve the surrounding environment.
2
Drive unit is faulty. Check the repeatability. If the problem is repeated, replace the
drive unit.
Alarm No.
2B
Motor side detector: CPU error 1:
An initial CPU error was detected in the motor side detector.
Cause of occurrence Investigation items Remedy
1
Detector internal circuit operation is
incorrect.
Check for abnormalities in the detector's
surrounding environment, etc.
(Example: Ambient temperature, noise,
grounding)
Improve the surrounding environment.
2
Detector is faulty. Check the repeatability.
Try connecting the drive unit and
detector with another axis, and check
the repeatability.
(Note) Do not release the emergency
stop in this case.
Replace the detector.
(When using the absolute position
system, the zero point must be
established again.)