Mitsubishi Electric MELSERVO-J4 Instruction Manual page 38

1. TROUBLESHOOTING FOR SERVO AMPLIFIER (DRIVE UNIT)
Alarm No.: 20 Name: Encoder normal communication error 1
Alarm content
Detail
Detail name
No.
20.5 Encoder (1) When you use an
normal
communication
- Transmission
data error 1
(2) An encoder cable is
(3) The external conductor
(4) When you use an
(5) The servo amplifier is
(6) An encoder is
(7) Something near the
20.6 Encoder (1) When you use an
normal
communication
- Transmission
data error 2
(2) An encoder cable is
(3) The external conductor
(4) When you use an
(5) The servo amplifier is
(6) An encoder is
(7) Something near the
20.7 Encoder Check it with the check method for [AL. 20.1].
normal
communication
- Transmission
data error 3
An error occurred in the communication between an encoder and servo amplifier.
Cause
Check if the A/B-
A/B/Z-phase differential phase pulse signals
output linear encoder, (PA, PAR, PB, and
the wiring of the linear PBR) of the encoder
encoder is incorrect. cable are
disconnected or
shorted.
Check it with the check method for [AL. 20.1].
malfunctioning.
of the encoder cable is
not connected to the
ground plate of the
connector.
A/B/Z-phase differential
output linear encoder,
the parameter setting is
incorrect.
malfunctioning.
malfunctioning.
device caused it.
Check if the Z-phase
A/B/Z-phase differential pulse signals
output linear encoder, (PZ/PZR) of the
the wiring of the linear encoder cable are
encoder is incorrect. disconnected or
shorted.
Check it with the check method for [AL. 20.1].
malfunctioning.
of the encoder cable is
not connected to the
ground plate of the
connector.
A/B/Z-phase differential
output linear encoder,
the parameter setting is
incorrect.
malfunctioning.
malfunctioning.
device caused it.
Check method Check result
It is disconnected or
shorted.
It is not
disconnected or
shorted.
It is disconnected or
shorted.
It is not
disconnected or
shorted.
1 - 31
Action Target
Repair the encoder [A]
cable. [B]
[GF]
Check (2).
[A]
[B]
[WB]
[RJ010]
[GF]
Repair the encoder [A]
cable. [B]
[GF]
Check (2).
[A]
[B]
[WB]
[RJ010]
[GF]