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Chapter 11 Troubleshooting
11–30
Alarm check timing
f1 f2 f3 f4
Alarm No.
93
Absolute position fluctuation:
A fluctuation exceeding the tolerable value was detected in the absolute position
detected when the CNC power is turned ON.
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{
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Investigation details Investigation results Remedies
The connector is disconnected (or
loose).
Correctly install. 1 Wiggle the connectors by hand to check
whether the detector connectors (unit
side and detector side) are
disconnected.
The connector is not disconnected. Investigate item 2.
There is a connection fault. Replace the communication cable. 2 Turn the power OFF, and check the
connection of the detector cables with a
tester.
The connection is normal. Investigate item 3.
The alarm is not repeated. If no abnormality is found with
investigation item 5, continue use.
3 Check the repeatability.
Carry out zero point return again.
The alarm is always repeated.
Or, the state returns to normal once, but
then is repeated sometimes.
Investigate item 4.
The alarm is on the unit side. Replace the drive unit. 4 Connect with another normal axis unit
and check whether the fault is on the
unit side.
The alarm occurs even when the unit is
replaced.
Investigate item 5.
No abnormality is found in particular. Replace the motor (detector). 5 Check if there is any abnormality in the
unit's ambient environment.
(Ex. Ambient temperature, noise,
grounding)
An abnormality was found in the
ambient environment.
Take remedies according to the causes of
the abnormality.
Ex. High
temperature ... Check the
cooling
fan.
Incomplete grounding .... Additionally
ground.
CAUTION
To prevent trouble, when changing the motor and driver combination, avoid
driving a driver with a larger capacity than the specified driver using the motor.
The motor could be demagnetized. Note that this combination can be used for
checking in the emergency stop state. The motor can be driven with a driver
with a capacity smaller than the specifications.