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

Page: 37 / 174

1. TROUBLESHOOTING FOR SERVO AMPLIFIER (DRIVE UNIT)
1 - 30
Alarm No.: 20 Name: Encoder normal communication error 1
Alarm content An error occurred in the communication between an encoder and servo amplifier.
Detail
No.
Detail name Cause Check method Check result Action Target
20.1 Encoder
normal
communication
- Receive data
error 1
(1) An encoder cable is
malfunctioning.
Check if the encoder
cable is disconnected
or shorted. When you
use an A/B/Z-phase
differential output
linear encoder, check
the wiring of the linear
encoder. It has a failure. Repair or replace
the cable. [A]
[B]
[WB]
[RJ010]
[GF]
It has no failure. Check (2).
(2) The external conductor
of the encoder cable is
not connected to the
ground plate of the
connector.
Check if it is
connected. It is not connected. Connect it correctly.
It is connected. Check (3).
(3) The parameter setting
of communication
method is incorrect.
[A]: [Pr. PC22]
[B] [WB] [RJ010] [GF]:
[Pr. PC04]
Check the parameter
setting. The setting is
incorrect. Set it correctly.
The setting is
correct. Check (4).
(4) The servo amplifier is
malfunctioning.
Replace the servo
amplifier, and then
check the
repeatability. It is not repeatable. Replace the servo
amplifier.
It is repeatable. Check (5).
(5) An encoder is
malfunctioning.
Replace the servo
motor or linear
encoder, and then
check the
repeatability. It is not repeatable. Replace the servo
motor or linear
encoder.
It is repeatable. Check (6).
(6) Something near the
device caused it.
Check the noise,
ambient temperature,
vibration, etc. It has a failure. Take
countermeasures
against its cause.
20.2 Encoder
normal
communication
- Receive data
error 2
Check it with the check method for [AL. 20.1].
20.3 Encoder
normal
communication
- Receive data
error 3