Mitsubishi Electric MELSERVO MR-MT2010 Instruction Manual page 207

10. TROUBLESHOOTING
Alarm No.: 20 Name: Encoder I/F module - Ch. A Normal communication error 1
Alarm content
Detail
Detail name
No.
20.5 Encoder I/F (1) The encoder cable is
module - Ch. A
Normal
communication -
(2) The external conductor
Transmission
data error 1
(3) The parameter setting is
(4) An excessive speed has
(5) The encoder I/F module
(6) The encoder is
(7) Problem with the
20.6 Encoder I/F Check it with the check method for [AL. 20.1].
module - Ch. A
Normal
communication -
Transmission
data error 2
20.7 Encoder I/F
module - Ch. A
Normal
communication -
Transmission
data error 3
A communication error has occurred between the encoder connected to ch. A and the encoder I/F module.
Cause
Check if the encoder
malfunctioning. cable is disconnected
or shorted.
Check if it is
of the encoder cable is connected.
not connected to an
SHD pin of the
connector.
Check if a value
incorrect. smaller than its actual
operation pattern is set
in [Pr. PTE043] and
[Pr. PTE044].
Check if an excessive
occurred. speed has occurred in
a machine where the
encoder is installed.
Replace the encoder
is malfunctioning. I/F module, and then
check the
repeatability.
Replace the encoder
malfunctioning. connected to ch. A,
and then check the
repeatability.
Check the noise,
surrounding. ambient temperature,
vibration, etc.
Check method Check result
It has a failure.
It has no failure.
Not connected
Connected
It is set.
It is not set.
It has not occurred.
It occurred.
It is not repeatable.
It is repeatable.
It is not repeatable.
It is repeatable.
It has a failure.
10 - 14
Action Target
Repair or replace the [MT2400]
cable.
Check (2).
Connect it correctly.
Check (3).
Set the parameters
according to the
actual operation
pattern.
Check (4).
Remove the cause
for the excessive
speed.
Check (5).
Replace the
encoder I/F module.
Check (6).
Replace the
encoder.
Check (7).
Take
countermeasures
against its cause.