Mitsubishi Electric MELSERVO-J3W Series Instruction Manual page 151

8. TROUBLESHOOTING
Alarm No.20
Alarm description
Display Name
20.1 Encoder receive
data error 1
20.2 Encoder receive
data error 2
20.3 Encoder receive
data error 3
20.5 Encoder
transmission data
error 1
20.6 Encoder
transmission data
error 2
20.7 Encoder
transmission data
error 3
Name: Encoder normal communication error 1
Error is found in the communication between the encoder and the servo amplifier.
Cause
(1) Encoder cable is faulty.
(2) Fault is generated from
the surrounding
environment.
(3) Servo amplifier is faulty.
(1) Encoder cable is faulty.
(2) Fault is generated from
the surrounding
environment.
(3) Servo amplifier is faulty.
(1) The encoder cable is
unplugged.
(2) Encoder cable is faulty.
(3) Improper shield treatment
of encoder cable.
(4) Servo amplifier is faulty.
(5) Fault is generated from
the surrounding
environment.
(1) Improper shield treatment
of encoder cable.
(2) Fault is generated from
the surrounding
environment.
(3) Encoder is faulty.
(1) Improper shield treatment
of encoder cable.
(2) Fault is generated from
the surrounding
environment.
(3) Encoder is faulty.
(1) Improper shield treatment
of encoder cable.
(2) Fault is generated from
the surrounding
environment.
(3) Encoder is faulty.
Stop method: Corresponding axis stops
Checkpoint
Check the shield. Problem found.
No problem found.
Check for noise, Problem found.
surrounding air
temperature, and other
factors.
No problem found.
Replace the servo Not reproduced.
amplifier and check the
reproducibility of the error. Reproduced.
Examine checkpoints described in the alarm display "20.1".
Check if the encoder Not connected
cable is connected properly.
properly.
Connected properly.
Check for breakage and Problem found.
short of the encoder
cable.
No problem found.
Check the shield Problem found.
treatment.
No problem found.
Replace the servo Not reproduced.
amplifier and check the
reproducibility of the error. Reproduced.
Check for external noise, Problem found.
surrounding air
temperature, and other
factors.
Check the shield Problem found.
treatment.
No problem found.
Check for noise, and Problem found.
other factors.
No problem found.
Replace the servo motor Error is not
and check the reproduced.
reproducibility of the error.
Examine checkpoints described in the alarm display "20.5".
Examine checkpoints described in the alarm display "20.5".
8 - 12
Finding Action
Repair the cable.
Check (2).
Take countermeasure
according to the
cause.
Check (3).
Replace the servo
amplifier.
Examine checkpoints
described in the alarm
display "20.3".
Connect properly.
Check (2).
Repair or replace the
cable.
Check (3).
Take measures
against noise.
Check (4).
Replace the servo
amplifier.
Check (5).
Take countermeasure
according to the
cause.
Repair the cable.
Check (2).
Take countermeasure
according to the
cause.
Check (3).
Replace the servo
motor.