Mitsubishi Electric MELSERVO MR-MT2010 Instruction Manual page 208

10. TROUBLESHOOTING
Alarm No.: 21 Name: Encoder I/F module - Ch. A Normal communication error 2
Alarm content
Detail
Detail name
No.
21.1 Encoder I/F (1) The external conductor
module - Ch. A
Data error 1
(2) The encoder is
(3) Problem with the
21.2 Encoder I/F (1) The encoder is
module - Ch. A
Data update
error
(2) The external conductor
(3) Problem with the
21.3 Encoder I/F Check it with the check method for [AL. 21.2].
module - Ch. A
Data waveform
error
21.4 Encoder I/F (1) A signal of the encoder
module - Ch. A
Non-signal error
(2) The external conductor
(3) Problem with the
21.5 Encoder I/F Check it with the check method for [AL. 21.2].
module - Ch. A
Hardware error
1
21.6 Encoder I/F
module - Ch. A
Hardware error
2
The encoder connected to ch. A detected an error signal.
Cause
Check if it is
of the encoder cable is connected.
not connected to an
SHD pin of the
connector.
Replace the encoder,
malfunctioning. and then check the
repeatability.
Check the noise,
surrounding. ambient temperature,
vibration, etc.
Replace the encoder,
malfunctioning. and then check the
repeatability.
Check if it is
of the encoder cable is connected.
not connected to an
SHD pin of the
connector.
Check the noise,
surrounding. ambient temperature,
etc.
Check if the encoder
connected to ch. A has cable is connected
not been input. correctly.
Check if it is
of the encoder cable is connected.
not connected to an
SHD pin of the
connector.
Check the noise,
surrounding. ambient temperature,
etc.
Check method Check result
Not connected
Connected
It is not repeatable.
It is repeatable.
It has a failure.
It is not repeatable.
It is repeatable.
Not connected
Connected
It has a failure.
It has a failure.
It has no failure.
Not connected
Connected
It has a failure.
10 - 15
Action Target
Connect it correctly. [MT2400]
Check (2).
Replace the
encoder.
Check (3).
Take
countermeasures
against its cause.
Replace the
encoder.
Check (2).
Connect it correctly.
Check (3).
Take
countermeasures
against its cause.
Review the wiring. [MT2400]
Check (2).
Connect it correctly.
Check (3).
Take
countermeasures
against its cause.