Mitsubishi Electric Melservo-J4 Instruction Manual page 90

Alarm No.: 7A
Alarm content
Detail Detail name
No.
7A.1 Parameter
verification error
(safety
observation
function)
7A.2 Parameter
setting range
error (safety
observation
function)
7A.3 Parameter
combination
error (safety
observation
function)
7A.4 Functional
safety unit
combination
error (safety
observation
function)
Alarm No.: 7B
Alarm content
Detail Detail name
No.
7B.1 Encoder
diagnosis error
1 (safety
observation
function)
1 TROUBLESHOOTING FOR SERVO AMPLIFIER (DRIVE UNIT)
88
1.4 Remedies for alarms
Name: Parameter setting error (safety observation function)
 A parameter of the functional safety unit failed.
Cause Check method
(1) A parameter of the Review the parameter.
functional safety unit is
incorrect.
(2) The functional safety Replace the functional
unit is malfunctioning. safety unit, and then
check the repeatability.
(3) Something near the Check the noise, ambient
device caused it. temperature, etc.
(1) The initial settings for Check the [Pr. PSA01]
the functional safety setting.
unit have not been
finished.
(2) A parameter of the Check the value of set
functional safety unit parameters.
was set out of range.
(1) A parameter of the Check the parameter
functional safety unit or settings of the functional
servo amplifier is safety unit and servo
incorrect. amplifier.
Functional safety unit:
[Pr. PSA02], [Pr. PSA18]
to [Pr. PSA21], [Pr.
PSC03], [Pr. PSD01] to
[Pr. PSD17], [Pr. PSD26]
Servo amplifier:
[Pr. PA14]
(1) A combination of Check if correct
functional safety unit combination of servo
and servo amplifier is amplifier is connected.
incorrect.
Name: Encoder diagnosis error (safety observation function)
 Error occurred in encoder.
Cause Check method
(1) An encoder cable is Check if the encoder
malfunctioning. cable is disconnected or
shorted.
(2) An encoder is Replace the servo motor,
malfunctioning. and then check the
repeatability.
(3) The functional safety Replace the functional
unit is malfunctioning. safety unit, and then
check the repeatability.
(4) The servo amplifier is Replace the servo
malfunctioning. amplifier, and then check
the repeatability.
(5) Something near the Check the noise, ambient
device caused it. temperature, vibration,
etc.
Check result Action
It is not repeatable. Set the parameter
correctly.
It is repeatable. Check (2).
It is not repeatable. Replace the functional
safety unit.
It is repeatable. Check (3).
There is a problem in the Take countermeasures
surrounding. against its cause.
It is not enabled. Enable the setting with
checking parameter
contents.
It is enabled. Check (2).
It is out of setting range. Set it within the range.
It is not set correctly. Set the parameter
correctly.
A different servo Return to the servo
amplifier is connected. amplifier which was
combined with the
functional safety unit and
was set the safety
observation function, or
initialize the setting.
Check result Action
It has a failure. Repair or replace the
cable.
It has no failure. Check (2).
It is not repeatable. Replace the servo motor.
It is repeatable. Check (3).
It is not repeatable. Replace the functional
safety unit.
It is repeatable. Check (4).
It is not repeatable. Replace the servo
amplifier.
It is repeatable. Check (5).
There is a problem in the Take countermeasures
surrounding. against its cause.
Target
[A]
[B]
[GF]
Target
[A]
[B]
[GF]