Mitsubishi Electric MELSERVO-J4 Instruction Manual Trouble Shooting page 55

1. TROUBLESHOOTING
Alarm No.: 72 Name: Load-side encoder normal communication error 2
Alarm content
Detail
Detail name
No.
72.1 Load-side (1)
encoder data
error 1
(2) A load-side encoder is
(3) Something near the
72.2 Load-side (1) A load-side encoder is
encoder data
update error
(2) Something near the
72.3 Load-side Check it with the check method for [AL. 72.2].
encoder data
waveform error
72.4 Load-side (1)
encoder non-
signal error
(2) Something near the
72.5 Load-side Check it with the check method for [AL. 72.2].
encoder
hardware error
1
72.6 Load-side
encoder
hardware error
2
72.9 Load-side Check it with the check method for [AL. 72.1].
encoder data
error 2
Alarm No.: 74 Name: Option card error 1
Alarm content
Detail
Detail name
No.
74.1 Option card (1)
error 1
(2) MR-J3-T10 is
(3) The servo amplifier is
The load-side encoder detected an error signal.
Cause
The encoder detected a 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.
Replace the load-side
malfunctioning. encoder, and then
check the
repeatability.
Check the noise,
device caused it. ambient temperature,
etc.
A signal of the load-side Check if the load-side
encoder has not been encoder cable is wired
inputted. correctly.
Check the noise,
device caused it. ambient temperature,
etc.
MR-J3-T10 came off.
MR-J3-T10 is not properly recognized.
Cause
The MR-J3-T10 came Check if the MR-J3-
off during the CC-Link T10 is mounted
IE communication. correctly.
Replace the MR-J3-
malfunctioning. T10, and then check
the repeatability.
Replace the servo
malfunctioning. amplifier, and then
check the
repeatability.
Check method Check result
It is not repeatable.
It is repeatable.
It is not repeatable.
It is repeatable.
It has a failure.
It is not repeatable.
It is repeatable.
It has a failure.
It has a failure.
It has no failure.
It has a failure.
Check method Check result
It is not mounted
correctly.
It is mounted
correctly.
It is not repeatable.
It is repeatable.
It is not repeatable.
1 - 48
Action Target
Use the encoder with [A]
low loop gain. [B]
[WB]
Check (2).
Replace the load-side
encoder.
Check (3).
Take
countermeasures
against its cause.
Replace the load-side
encoder.
Check (2).
Take
countermeasures
against its cause.
Review the wiring. [A]
[B]
Check (2).
[WB]
Take
countermeasures
against its cause.
Action Target
Mount it correctly. [RJ010]
Check (2).
Replace the MR-J3-
T10.
Check (3).
Replace the servo
amplifier.