Mitsubishi Electric MELSERVO-J4 Instruction Manual page 83

1. TROUBLESHOOTING FOR SERVO AMPLIFIER (DRIVE UNIT)
Alarm No.: 79 Name: Functional safety unit diagnosis error
Alarm content
Detail
Detail name
No.
79.3 Abnormal (1) Ambient temperature
temperature of
functional safety
unit
(2) Ambient temperature is
(3) The close mounting is
(4) An opening is clogged
(5) The functional safety
(6) Something near the
79.4 Servo amplifier (1) The functional safety
error
(2) The functional safety
(3) The servo amplifier is
(4) Something near the
79.5 Input device (1) A signal of input device
error
(2) The input device
(3) The test pulse time was
(4) The functional safety
(5) Something near the
A diagnosis of the functional safety unit failed.
Cause
Check the ambient
has exceeded 55 ˚C. temperature.
Check the ambient
less than 0 ˚C. temperature.
Check the
out of specifications. specifications of close
mounting.
Clean the opening and
up. check the
repeatability.
Replace the functional
unit is malfunctioning. safety unit, and then
check the
repeatability.
Check the power
device caused it. supply for noise.
Check the installation
unit came off. of the functional safety
unit.
Replace the functional
unit is malfunctioning. safety unit, and then
check the
repeatability.
Replace the servo
malfunctioning. amplifier, and then
check the
repeatability.
Check the noise,
device caused it. ambient temperature,
etc.
Check if the input
is not inputted device cable is wired
correctly. correctly.
Check if the
setting parameter is not parameter is set
set correctly. correctly.
Check the setting of
not set correctly. [Pr. PSD26 Input
device - Test pulse off
time].
Replace the functional
unit is malfunctioning. safety unit, and then
check the
repeatability.
Check the noise,
device caused it. ambient temperature,
etc.
Check method Check result
It is over 55 ˚C.
It is less than 55 ˚C.
It is less than 0 ˚C.
It is 0 ˚C or more.
It is out of
specifications.
It is within
specifications.
It is not repeatable.
It is repeatable.
It is not repeatable.
It is repeatable.
It has a failure.
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 has a failure.
It has no failure.
It is not set correctly. Review the
It is set correctly.
The test pulse width
is longer than the
set value.
The test pulse width
is shorter than the
set value.
It is not repeatable.
It is repeatable.
It has a failure.
1 - 76
Action Target
Lower the ambient [A]
temperature. [B]
[GF]
Check (2).
Increase the ambient
temperature.
Check (3).
Mount it correctly.
Check (4).
Clean it periodically.
Check (5).
Replace the
functional safety unit.
Check (6).
Take
countermeasures
against its cause.
Install it correctly.
Check (2).
Replace the
functional safety unit.
Check (3).
Replace the servo
amplifier.
Check (4).
Take
countermeasures
against its cause.
Review the wiring.
Check (2).
parameter.
Check (3).
Set the value longer.
Check (4).
Replace the
functional safety unit.
Check (5).
Take
countermeasures
against its cause.