Mitsubishi Electric MELSERVO-J3W Series, Instruction Manual

Page: 148 / 500

8. TROUBLESHOOTING
8 - 9
Alarm No.16 Name: Encoder initial communication error 1 Stop method: Corresponding axis stops
Alarm description Error occurs in the communication between the encoder and the servo amplifier.
Display Name Cause Checkpoint Finding Action
16.3 Encoder receive
data error 3
(1) Motor-less operation is
not set. Select motor-less
operation When using only one
axis, select the motor-
less operation for the axis
to which the servo motor
is not connected. Check if parameter No.
PC05 is set to motor-less
operation for the unused
axis.
Motor-less operation is
set. Check (2).
(2) The encoder cable is
unplugged.
Not connected
properly. Connect properly. Check if the encoder
cable is connected
properly.
Connected properly. Check (3).
(3) Encoder cable is faulty. Problem found. Repair or replace the
cable. Check for breakage and
short of the encoder
cable.
Check the shield.
No problem found. Check (4).
(4) Setting is incorrect. Correct the setting. Two-wire/four-wire type
parameter setting is
incorrect. Check the parameter No.
PC04 setting.
Two-wire type: "00
"
Four-wire type: "10 "
Normal. Check (5).
(5) Signal from the encoder
cannot be received.
Connect to a properly
operating servo motor. Alarm does not occur. Replace the servo
motor.
Alarm occurs. Check (6).
(6) Servo amplifier is faulty. Not reproduced. Replace the servo
amplifier. Replace the servo
amplifier and check the
reproducibility of the error. Reproduced. Check
(7).
(7) Fault is generated from
the surrounding
environment.
Check for noise, and
other factors. Problem found. Take countermeasure
according to the
cause.
16.5 (1) Encoder cable is faulty. Check the shield. Problem found. Repair the cable.
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.
16.6 (1) Encoder cable is faulty. Examine checkpoints described in the alarm display "16.5". Encoder
transmission data
error 2
(2) Fault is generated from
the surrounding
environment.
(3) Encoder is faulty.
16.7 (1) Encoder cable is faulty. Examine checkpoints described in the alarm display "16.5". Encoder
transmission data
error 3
(2) Fault is generated from
the surrounding
environment.
(3) Encoder is faulty.