Mitsubishi Electric MELSERVO-JE Instruction Manual page 24

1. SERVO AMPLIFIER TROUBLESHOOTING
Alarm No.: 1F Name: Encoder initial communication error 3
Alarm content
Detail
Detail name
No.
1F.1 Incompatible (1) A servo motor, which is
encoder
(2) The software version of
(3) An encoder is
Alarm No.: 20 Name: Encoder normal communication error 1
Alarm content
Detail
Detail name
No.
20.1 Encoder normal (1) An encoder cable is
communication -
Receive data
error 1
(2) The external conductor
(3) The servo amplifier is
(4) An encoder is
(5) Something near the
The connected encoder is not compatible with the servo amplifier.
Cause
Check the model of
not compatible with the the servo motor.
servo amplifier, has
been connected.
Check if the software
the servo amplifier is not version is compatible
compatible with the with the servo motor.
servo motor.
Replace the servo
malfunctioning. motor, and then check
the repeatability.
An error has occurred in the communication between an encoder and servo amplifier.
Cause
Check if the encoder
malfunctioning. cable is disconnected
or shorted.
Check if it is
of the encoder cable is connected.
not connected to the
ground plate of the
connector.
Replace the servo
malfunctioning. amplifier, and then
check the
repeatability.
Replace the servo
malfunctioning. motor, and then check
the repeatability.
Check the noise,
device caused it. ambient temperature,
vibration, etc.
Check method Check result
It is not compatible
with the servo
amplifier.
It is compatible with
the servo amplifier.
It is not compatible.
It is compatible.
It is not repeatable.
It is repeatable.
Check method Check result
It has a failure.
It has no failure.
It is not connected.
It is connected.
It is not repeatable.
It is repeatable.
It is not repeatable.
It is repeatable.
It has a failure.
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Action Target
Replace it with a [A]
compatible servo [B]
motor. [C]
Check (2).
Replace the servo
amplifier with one
whose software
version is compatible
with the servo motor.
Check (3).
Replace the servo
motor.
Replace the servo
amplifier.
Action Target
Repair or replace the [A]
cable. [B]
[C]
Check (2).
Connect it correctly.
Check (3).
Replace the servo
amplifier.
Check (4).
Replace the servo
motor.
Check (5).
Take
countermeasures
against its cause.