Mitsubishi Electric MELSERVO-J4 Instruction Manual Trouble Shooting page 53

1. TROUBLESHOOTING
Alarm No.: 70 Name: Load-side encoder initial communication error 1
Alarm content
Detail
Detail name
No.
70.6 Load-side (1)
encoder initial
communication
- Transmission
data error 2
(2) An load-side encoder
(3) The servo amplifier is
(4) A load-side encoder is
(5) Something near the
70.7 Load-side Check it with the check method for [AL. 70.1].
encoder initial
communication
- Transmission
data error 3
70.A Load-side (1) The servo amplifier is
encoder initial
communication
- Process error
1
(2) A load-side encoder is
(3) Something near the
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
An error occurred in the initial communication between the load-side encoder and servo amplifier.
Cause
When you use an A/B/Z- Check if the Z-phase
phase differential output pulse signals (PZ and
linear encoder, the PZR) of the encoder
wiring of the linear cable are
encoder is incorrect. disconnected or
shorted.
Check it with the check method for [AL. 70.1].
cable is malfunctioning.
malfunctioning.
malfunctioning.
device caused it.
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 is disconnected or
shorted.
It is not disconnected
or shorted.
It is not repeatable.
It is repeatable.
It is not repeatable.
It is repeatable.
It has a failure.
1 - 46
Action Target
Repair the encoder [A]
cable. [B]
Check (2).
[A]
[B]
[WB]
Replace the servo [A]
amplifier. [B]
[WB]
Check (2).
Replace the load-side
encoder.
Check (3).
Take
countermeasures
against its cause.