Mitsubishi Electric MELSERVO-J4 Instruction Manual page 85

1. TROUBLESHOOTING FOR SERVO AMPLIFIER (DRIVE UNIT)
Alarm No.: 79 Name: Functional safety unit diagnosis error
Alarm content
Detail
Detail name
No.
79.8 Position (1) The position feedback
feedback fixing
error
(2) The position feedback
(3) The servo motor is
(4) The functional safety
Alarm No.: 7A Name: Parameter setting error (safety observation function)
Alarm content
Detail
Detail name
No.
7A.1 Parameter (1) A parameter of the
verification error
(safety
observation
(2) The functional safety
function)
(3) Something near the
7A.2 Parameter (1) The initial settings for
setting range
error (safety
observation
function)
(2) A parameter of the
7A.3 Parameter (1) A parameter of the
combination
error (safety
observation
function)
A diagnosis of the functional safety unit failed.
Cause
Check the [Pr.
data do not change PSA22] setting.
within the position
feedback fixing error
detection time [Pr.
PSA22].
Check the feedback
data do not change. data by rotating the
servo motor.
Replace the servo
malfunctioning. motor, and then check
the repeatability.
Replace the functional
unit is malfunctioning. safety unit, and then
check the
repeatability.
A parameter of the functional safety unit failed.
Cause
Review the parameter. It is not repeatable.
functional safety unit is
incorrect.
Replace the functional
unit is malfunctioning. safety unit, and then
check the
repeatability.
Check the noise,
device caused it. ambient temperature,
etc.
Check the [Pr. PSA01]
the functional safety unit setting.
have not been finished.
Check the value of set
functional safety unit parameters.
was set out of range.
Check the parameter
functional safety unit or settings of the
servo amplifier is functional safety unit
incorrect. and servo amplifier.
Functional safety unit:
[Pr. PSA02], [Pr.
PSA18] to [Pr.
PSA21], [Pr. PSC03],
[Pr. PSD01] to [Pr.
PSD17], [Pr. PSD26]
Servo amplifier:
[Pr. PA14]
Check method Check result
It is not set
correctly.
It is set correctly.
The position
feedback data
changes.
The position
feedback data do
not change.
It is not repeatable.
It is repeatable.
It is not repeatable.
Check method Check result
It is repeatable.
It is not repeatable.
It is repeatable.
It has a failure.
It is not enabled.
It is enabled.
It is out of setting
range.
It is not set correctly. Set the parameter
1 - 78
Action Target
Review the [A]
parameter. [B]
[GF]
Check (2).
Perform an operation
which rotates the
servo motor within
the position feedback
fixing error detection
time [Pr. PSA22].
Check (3).
Replace the servo
motor.
Check (4).
Replace the
functional safety unit.
Action Target
Set the parameter [A]
correctly. [B]
[GF]
Check (2).
Replace the
functional safety unit.
Check (3).
Take
countermeasures
against its cause.
Enable the setting
with checking
parameter contents.
Check (2).
Set it within the
range.
correctly.