Nidec Control Techniques Digitax-SF DA21223, Instruction Manual

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14
8. Troubleshooting
Digitax SF
Instruction Man
ual
3. Alarms and Remedies
Alarm No.
16 Encoder (received data)
Symptom
and
Possible Cause
Encoder data changed rapidly for a short period of time.
Alarm No.
17 Encoder (no response)
Symptom
and
Possible Cause
Encoder communications were disconnected.
Alarm No.
19 Encoder (communication)
Symptom
and
Possible Cause
The initial communication with the encoder failed.
Alarm No.
20 Encoder (multi-turn data)
Symptom
and
Possible Cause
Absolute encoder data changed rapidly for a short period of time.
At the time of starting, the encoder failed to receive multi-turn data internally.
Remedy
Check for wire disconnection or loose connection of pins.
Keep the cable length no longer than 20 m
.
Check for noise interference.
→ Use a shielded twist-pair cable.
→ Keep the encoder cable away from the motor power cable.
→ Connect
Ground/Earth
FG firmly.
→ Use ferrite core for motor power cable and encoder cable.
If any of the above didn’t resolve the issue, please contact
the supplier of the drive
.
Reset Method
Alarm No.
18 Encoder (circuit)
Symptom
and
Possible Cause
The battery voltage of the absolute encoder dropped or the battery became disconnected.
(Alarm No.21 is output in this case)
The encoder temperature has exceeded the specification and output data has become abnormal.
Anomaly of the encoder itself has been detected.
Remedy
If you are using an absolute system
Replace the battery, connect it, and initialize the encoder.
If you are not using an absolute system
Check whether the encoder temperature is within specification.
If any of the above didn’t resolve the issue, please contact
the supplier of the drive
.
Reset Method