Mitsubishi Electric MELSERVO-J4 Instruction Manual page 76

1. TROUBLESHOOTING FOR SERVO AMPLIFIER (DRIVE UNIT)
Alarm No.: 70 Name: Load-side encoder initial communication error 1
Alarm content
Detail
Detail name
No.
70.1 Load-side (1) A load-side encoder
encoder initial
communication -
Receive data
error 1
(2) When you use an A/B/Z-
(3) When you use an A/B/Z-
(4) The servo amplifier is
(5) A load-side encoder is
(6) Something near the
70.2 Load-side Check it with the check method for [AL. 70.1].
encoder initial
communication -
Receive data
error 2
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 the servo
phase differential output amplifier (MR-J4-_-RJ)
linear encoder, the is compatible with the
servo amplifier is not A/B/Z-phase
compatible with the differential output
linear encoder. linear encoder.
Check if the wiring of
phase differential output the linear encoder is
linear encoder, the correct. (Check if it is
connection with the wired to PSEL.)
linear encoder is
incorrect.
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.
The servo amplifier
is not compatible
with it.
The servo amplifier
is compatible with it.
The wiring is
incorrect.
The wiring 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
Replace or repair [A]
the cable. [B]
[WB]
Check (2).
[GF]
Use a servo [A]
amplifier which is [B]
compatible with it. [GF]
Check (3).
Wire it correctly.
Check (4).
Replace the servo [A]
amplifier. [B]
[WB]
Check (5).
[GF]
Replace the load-
side encoder.
Check (6).
Take
countermeasures
against its cause.