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

Page: 38 / 174

1. TROUBLESHOOTING FOR SERVO AMPLIFIER (DRIVE UNIT)
1 - 31
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
20.5 Encoder
normal
communication
- Transmission
data error 1
(1) When you use an
A/B/Z-phase differential
output linear encoder,
the wiring of the linear
encoder is incorrect.
Check if the A/B-
phase pulse signals
(PA, PAR, PB, and
PBR) of the encoder
cable are
disconnected or
shorted. It is disconnected or
shorted. Repair the encoder
cable. [A]
[B]
[GF]
It is not
disconnected or
shorted. Check (2).
(2) An encoder cable is
malfunctioning.
Check it with the check method for [AL. 20.1]. [A]
[B]
[WB]
[RJ010]
[GF]
(3) The external conductor
of the encoder cable is
not connected to the
ground plate of the
connector.
(4) When you use an
A/B/Z-phase differential
output linear encoder,
the parameter setting is
incorrect.
(5) The servo amplifier is
malfunctioning.
(6) An encoder is
malfunctioning.
(7) Something near the
device caused it.
20.6 Encoder
normal
communication
- Transmission
data error 2
(1) When you use an
A/B/Z-phase differential
output linear encoder,
the wiring of the linear
encoder is incorrect.
Check if the Z-phase
pulse signals
(PZ/PZR) of the
encoder cable are
disconnected or
shorted. It is disconnected or
shorted. Repair the encoder
cable. [A]
[B]
[GF]
It is not
disconnected or
shorted. Check (2).
(2) An encoder cable is
malfunctioning.
Check it with the check method for [AL. 20.1]. [A]
[B]
[WB]
[RJ010]
[GF]
(3) The external conductor
of the encoder cable is
not connected to the
ground plate of the
connector.
(4) When you use an
A/B/Z-phase differential
output linear encoder,
the parameter setting is
incorrect.
(5) The servo amplifier is
malfunctioning.
(6) An encoder is
malfunctioning.
(7) Something near the
device caused it.
20.7 Encoder
normal
communication
- Transmission
data error 3
Check it with the check method for [AL. 20.1].