Mitsubishi Electric Melservo-J4 Instruction Manual page 77

Alarm No.: 66 Name: Encoder initial communication error (safety observation function)
 The connected encoder is not compatible with the servo amplifier.
Alarm content
 An error has occurred in the communication between an encoder and servo amplifier.
Detail Detail name Cause
No.
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 functional safety is not
- Process error connected.
1 (safety
observation
(2) The functional safety
function)
unit is malfunctioning.
(3) The servo amplifier is
malfunctioning.
(4) An encoder is
malfunctioning.
(5)
device caused it.
Alarm No.: 67 Name: Encoder normal communication error 1 (safety observation function)
 An error has occurred in the communication between an encoder and servo amplifier.
Alarm content
Detail Detail name Cause
No.
67.1 Encoder normal (1) An encoder cable is
communication malfunctioning.
- Receive data
error 1 (safety
(2) The servo amplifier is
observation
malfunctioning.
function)
(3) An encoder is
malfunctioning.
(4)
device caused it.
Check method
Check if a servo motor
with functional safety is
connected.
Replace the functional
safety unit, and then
check the repeatability.
Replace the servo
amplifier, and then check
the repeatability.
Replace the servo motor,
and then check the
repeatability.
Something near the Check the noise, ambient
temperature, etc.
Check method
Check if the encoder
cable is disconnected or
shorted.
Replace the servo
amplifier, and then check
the repeatability.
Replace the servo motor,
and then check the
repeatability.
Something near the Check the noise, ambient
temperature, vibration,
etc.
Check result
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.
There is a problem in the
surrounding.
Check result
It has a failure.
It has no failure.
It is not repeatable.
It is repeatable.
It is not repeatable.
It is repeatable.
There is a problem in the
surrounding.
1 TROUBLESHOOTING FOR SERVO AMPLIFIER (DRIVE UNIT)
Action Target
Connect a servo motor [A]
with functional safety. [B]
[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.
Action Target
Repair or replace the [A]
cable. [B]
[GF]
Check (2).
Replace the servo
amplifier.
Check (3).
Replace the servo motor.
Check (4).
Take countermeasures
against its cause.
1.4 Remedies for alarms
1
75