Mitsubishi Electric MELSERVO-J4 Instruction Manual page 80

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