Mitsubishi Electric MELSERVO-J4 Instruction Manual page 78

1. TROUBLESHOOTING FOR SERVO AMPLIFIER (DRIVE UNIT)
Alarm No.: 70 Name: Load-side encoder initial communication error 1
Alarm content
Detail
Detail name
No.
70.5 Load-side (1) When you use an
encoder initial
communication
- Transmission
data error 1
(2) A load-side encoder
(3) The servo amplifier is
(4) A load-side encoder is
(5) Something near the
70.6 Load-side (1) When you use an
encoder initial
communication
- Transmission
data error 2
(2) A 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
An error occurred in the initial communication between the load-side encoder and servo amplifier.
Cause
Check if the A/B-
A/B/Z-phase differential phase pulse signals
output linear encoder, (PA, PAR, PB, and
the wiring of the linear PBR) of the encoder
encoder is incorrect. cable are
disconnected or
shorted.
Check it with the check method for [AL. 70.1].
cable is malfunctioning.
malfunctioning.
malfunctioning.
device caused it.
Check if the Z-phase
A/B/Z-phase differential pulse signals
output linear encoder, (PZ/PZR) of the
the wiring of the linear encoder 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 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.
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Action Target
Repair the encoder [A]
cable. [B]
[GF]
Check (2).
[A]
[B]
[WB]
[GF]
Repair the encoder [A]
cable. [B]
[GF]
Check (2).
[A]
[B]
[WB]
[GF]
Replace the servo [A]
amplifier. [B]
[WB]
Check (2).
[GF]
Replace the load-
side encoder.
Check (3).
Take
countermeasures
against its cause.