Mitsubishi Electric MELSERVO MR-J4-B-RJ Series, Instruction Manual

Page: 80 / 174

1. TROUBLESHOOTING FOR SERVO AMPLIFIER (DRIVE UNIT)
1 - 73
Alarm No.: 71 Name: Load-side encoder normal communication error 1
Alarm content An error occurred in the communication between the load-side encoder and servo amplifier.
Detail
No.
Detail name Cause Check method Check result Action Target
71.2 Load-side
encoder normal
communication -
Receive data
error 2
Check it with the check method for [AL. 71.1].
71.3 Load-side
encoder normal
communication -
Receive data
error 3
71.5 Load-side
encoder normal
communication -
Transmission
data error 1
71.6 Load-side
encoder normal
communication -
Transmission
data error 2
71.7 Load-side
encoder normal
communication -
Transmission
data error 3
71.9 Load-side
encoder normal
communication -
Receive data
error 4
71.A Load-side
encoder normal
communication -
Receive data
error 5
Alarm No.: 72 Name: Load-side encoder normal communication error 2
Alarm content The load-side encoder detected an error signal.
Detail
No.
Detail name Cause Check method Check result Action Target
72.1 Load-side
encoder data
error 1
(1) The encoder detected a
high speed/acceleration
rate due to an oscillation
or other factors.
Decrease the loop
gain, and then check
the repeatability. It is not repeatable. Use the encoder
with low loop gain. [A]
[B]
[WB]
[GF]
It is repeatable. Check (2).
(2) A load-side encoder is
malfunctioning.
Replace the load-side
encoder, and then
check the
repeatability. It is not repeatable. Replace the load-
side encoder.
It is repeatable. Check (3).
(3) Something near the
device caused it.
Check the noise,
ambient temperature,
vibration, etc. It has a failure. Take
countermeasures
against its cause.