Mitsubishi Electric MELSERVO-J4 Instruction Manual Trouble Shooting page 54

1. TROUBLESHOOTING
Alarm No.: 71 Name: Load-side encoder normal communication error 1
Alarm content
Detail
Detail name
No.
71.1 Load-side (1) A load-side encoder
encoder
communication
- Receive data
error 1
(2) The servo amplifier is
(3) A load-side encoder is
(4) Something near the
71.2 Load-side Check it with the check method for [AL. 71.1].
encoder
communication
- Receive data
error 2
71.3 Load-side
encoder
communication
- Receive data
error 3
71.5 Load-side
encoder
communication
- Transmission
data error 1
71.6 Load-side
encoder
communication
- Transmission
data error 2
71.7 Load-side
encoder
communication
- Transmission
data error 3
71.9 Load-side
encoder
communication
- Transmission
data error 4
71.A Load-side
encoder
communication
- Transmission
data error 5
An error occurred in the communication between the load-side encoder and servo amplifier.
Cause
Check if the load-side
cable is malfunctioning. encoder cable is
disconnected or
shorted.
Replace the servo
malfunctioning. amplifier, and then
check the
repeatability.
Replace the load-side
malfunctioning. encoder, and then
check the
repeatability.
Check the noise,
device caused it. ambient temperature,
vibration, etc.
Check method Check result
It has a failure.
It has no failure.
It is not repeatable.
It is repeatable.
It is not repeatable.
It is repeatable.
It has a failure.
1 - 47
Action Target
Repair or replace the [A]
cable. [B]
[WB]
Check (2).
Replace the servo
amplifier.
Check (3).
Replace the load-side
encoder.
Check (4).
Take
countermeasures
against its cause.