Mitsubishi Electric MELSERVO-J4 Instruction Manual page 71

1. TROUBLESHOOTING FOR SERVO AMPLIFIER (DRIVE UNIT)
Alarm No.: 66 Name: Encoder initial communication error (safety observation function)
Alarm content
Detail
Detail name
No.
66.1 Encoder initial (1) An encoder cable is
communication
- Receive data
error 1 (safety
(2) The servo amplifier is
observation
function)
(3) An encoder is
(4) Something near the
66.2 Encoder initial Check it with the check method for [AL. 66.1].
communication
- Receive data
error 2 (safety
observation
function)
66.3 Encoder initial
communication
- Receive data
error 3 (safety
observation
function)
66.7 Encoder initial
communication
- Transmission
data error 1
(safety
observation
function)
66.9 Encoder initial (1) A servo motor with
communication
- Process error
1 (safety
observation
function)
(2) The functional safety
(3) The servo amplifier is
(4) An encoder is
(5) Something near the
The connected encoder is not compatible with the servo amplifier.
An error has occurred in the communication between an encoder and servo amplifier.
Cause
Check if the encoder
malfunctioning. cable is disconnected
or shorted.
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 if a servo motor
functional safety is not with functional safety
connected. is connected.
Replace the functional
unit is malfunctioning. safety unit, and then
check the
repeatability.
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,
etc.
Check method Check result
It has a failure.
It has no failure.
It is not repeatable.
It is repeatable.
It is not repeatable.
It is repeatable.
It has a failure.
It is not a servo
motor with
functional safety.
It is a servo motor
with functional
safety.
It is not repeatable.
It is repeatable.
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 or repair [A]
the cable. [B]
[GF]
Check (2).
Replace the servo
amplifier.
Check (3).
Replace the servo
motor.
Check (4).
Take
countermeasures
against its cause.
Connect a servo [A]
motor with [B]
functional safety. [GF]
Check (2).
Replace the
functional safety unit.
Check (3).
Replace the servo
amplifier.
Check (4).
Replace the servo
motor.
Check (5).
Take
countermeasures
against its cause.