8. TROUBLESHOOTING
8 - 12
Alarm No.20
Name: Encoder normal communication error 1
Stop method: Corresponding axis stops
Alarm description
Error is found in the communication between the encoder and the servo amplifier.
Display Name
Cause
Checkpoint
Finding
Action
20.1
(1) Encoder cable is faulty.
Check the shield.
Problem found.
Repair the cable.
Encoder receive
data error 1
No problem found.
Check (2).
(2) Fault is generated from
the surrounding
environment.
Problem found.
Take countermeasure
according to the
cause.
Check for noise,
surrounding air
temperature, and other
factors.
No problem found.
Check (3).
(3) Servo amplifier is faulty.
Not reproduced.
Replace the servo
amplifier.
Replace the servo
amplifier and check the
reproducibility of the error. Reproduced. Examine
checkpoints
described in the alarm
display "20.3".
20.2
(1) Encoder cable is faulty.
Examine checkpoints described in the alarm display "20.1".
Encoder receive
data error 2
(2) Fault is generated from
the surrounding
environment.
(3) Servo amplifier is faulty.
20.3 Encoder
receive
data error 3
(1) The encoder cable is
unplugged.
Not connected
properly.
Connect properly.
Check if the encoder
cable is connected
properly.
Connected properly.
Check (2).
(2) Encoder cable is faulty.
Problem found.
Repair or replace the
cable.
Check for breakage and
short of the encoder
cable.
No problem found.
Check (3).
(3)
Check the shield
treatment.
Problem found.
Take measures
against noise.
Improper shield treatment
of encoder cable.
No problem found.
Check (4).
(4) Servo amplifier is faulty.
Not reproduced.
Replace the servo
amplifier.
Replace the servo
amplifier and check the
reproducibility of the error. Reproduced. Check
(5).
(5) Fault is generated from
the surrounding
environment.
Check for external noise,
surrounding air
temperature, and other
factors.
Problem found.
Take countermeasure
according to the
cause.
20.5
(1)
Problem found.
Repair the cable.
Improper shield treatment
of encoder cable.
Check the shield
treatment.
No problem found.
Check (2).
Encoder
transmission data
error 1
(2) Fault is generated from
the surrounding
environment.
Check for noise, and
other factors.
Problem found.
Take countermeasure
according to the
cause.
No problem found.
Check (3).
(3) Encoder is faulty.
Replace the servo motor
and check the
reproducibility of the error.
Error is not
reproduced.
Replace the servo
motor.
20.6
(1) Improper shield treatment
of encoder cable.
Examine checkpoints described in the alarm display "20.5".
Encoder
transmission data
error 2
(2) Fault is generated from
the surrounding
environment.
(3) Encoder is faulty.
20.7
(1) Improper shield treatment
of encoder cable.
Examine checkpoints described in the alarm display "20.5".
Encoder
transmission data
error 3
(2) Fault is generated from
the surrounding
environment.
(3) Encoder is faulty.
Summary of Contents for MELSERVO-J3W Series
Page 17: ...8 MEMO ...
Page 27: ...1 FUNCTIONS AND CONFIGURATION 1 10 MEMO ...
Page 87: ...4 STARTUP 4 14 MEMO ...
Page 117: ...5 PARAMETERS 5 30 MEMO ...
Page 129: ...6 GENERAL GAIN ADJUSTMENT 6 12 MEMO ...
Page 185: ...10 CHARACTERISTICS 10 8 MEMO ...
Page 241: ...11 OPTIONS AND AUXILIARY EQUIPMENT 11 56 MEMO ...
Page 274: ...13 USING A LINEAR SERVO MOTOR 13 25 1 2 3 4 ...