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Chapter 11 Troubleshooting
11–20
Alarm check timing
f1 f2 f3 f4
Alarm No.
4A
Absolute position detection circuit error:
An error was detected in the scale or scale side circuit of the absolute position linear
scale connected to the MAIN side.
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{ { {
Investigation details Investigation results Remedies
1 Check the alarm No. "49" items.
Alarm check timing
f1 f2 f3 f4
Alarm No.
4B
Incremental position detection circuit error:
A speed exceeding the max. movement speed of the absolute position linear scale
connected to the MAIN side was detected.
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{ { {
Investigation details Investigation results Remedies
The machine was operating. Investigate item 3. 1 Check whether the machine was
operating when the alarm occurred.
The machine was not operating. Investigate item 2.
The machine was operating. Investigate item 3. 2 Check whether the operation is normal
at low-speeds.
The machine was not operating. Check the precautions for turning the
power ON.
• Wiring check
• Parameter check
The connector is disconnected (or
loose).
Correctly install. 3 Wiggle the connectors by hand to check
whether the absolute position linear
scale connectors (unit side and scale
side) are disconnected.
The connector is not disconnected. Investigate item 4.
There is a connection fault. Replace the detector cable. 4 Turn the power OFF, and check the
detector cable connection with a tester.
The connection is normal. Investigate item 5.
The alarm is on the unit side. Replace the drive unit. 5 Connect to another normal axis unit,
and check whether the fault is on the
unit side or detector side.
The alarm is on the absolute position
linear scale side.
Investigate item 6.
No abnormality is found in particular. Replace the motor (the absolute position
linear scale).
6 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.