Mitsubishi Electric MELSERVO-J4 Instruction Manual page 79

1. TROUBLESHOOTING FOR SERVO AMPLIFIER (DRIVE UNIT)
Alarm No.: 70 Name: Load-side encoder initial communication error 1
Alarm content
Detail
Detail name
No.
70.B Load-side Check it with the check method for [AL. 70.A].
encoder initial
communication
- Process error
2
70.C Load-side
encoder initial
communication
- Process error
3
70.D Load-side
encoder initial
communication
- Process error
4
70.E Load-side
encoder initial
communication
- Process error
5
70.F Load-side
encoder initial
communication
- Process error
6
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 normal
communication
- Receive data
error 1
(2) The external conductor
(3) The parameter setting
(4) The servo amplifier is
(5) A load-side encoder is
(6) Something near the
An error occurred in the initial communication between the load-side encoder and servo amplifier.
Cause
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.
Check if it is
of the encoder cable is connected.
not connected to the
ground plate of the
connector.
Check the parameter
of communication setting.
method is incorrect.
[A]: [Pr. PC44]
[B] [GF]: [Pr. PC26]
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
Check method Check result
It has a failure.
It has no failure.
It is not connected.
It is connected.
The setting is
incorrect.
The setting is
correct.
It is not repeatable.
It is repeatable.
It is not repeatable.
It is repeatable.
It has a failure.
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Action Target
Action Target
Repair or replace [A]
the cable. [B]
[WB]
Check (2).
[GF]
Connect it correctly.
Check (3).
Set it correctly. [A]
[B]
[GF]
Check (4).
Replace the servo [A]
amplifier. [B]
[WB]
Check (5).
[GF]
Replace the load-
side encoder.
Check (6).
Take
countermeasures
against its cause.