Mitsubishi Electric MELSERVO-J4 Instruction Manual page 87

1. TROUBLESHOOTING FOR SERVO AMPLIFIER (DRIVE UNIT)
Alarm No.: 7C Name: Functional safety unit communication diagnosis error (safety observation function)
Alarm content
Detail
Detail name
No.
7C.1 Functional (1) Communication cycle
safety unit
communication
setting error
(safety
observation
function)
(2) The time taken for the
(3) The functional safety
(4) Something near the
7C.2 Functional (1) The time taken for the
safety unit
communication
data error
(safety
(2) An error occurred at
observation
function)
(3) An error occurred at
(4) [B]: Check it with the check method for [AL. 34.1].
The network communication had an error in the functional safety unit.
Cause
Check the
does not match. communication cycle
setting ([Pr. PSC01])
of the servo system
controller and the
functional safety unit.
Refer to "MR-D30
detection of safety Instruction Manual"
communication errors and check the setting.
is not set correctly.
Replace the functional
unit is malfunctioning. safety unit, and then
check the
repeatability.
Check the noise,
device caused it. ambient temperature,
etc.
Refer to "MR-D30
detection of safety Instruction Manual"
communication errors and check the setting.
is not set correctly.
Check if an alarm
the safety master occurs at the safety
station side. master station.
Check if the settings of
the servo system the servo system
controller side. controller side are
correct.
[GF]: Check it with the check method for [AL. 8D.1].
Check method Check result
Communication
cycle setting is
incorrect.
Communication
cycle setting is
correct.
It is not set
correctly.
It is set correctly.
It is not repeatable.
It is repeatable.
It has a failure.
It is not set
correctly.
It is set correctly.
It is occurring.
It did not occur.
It has a failure.
It has no failure.
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Action Target
Set it correctly. [B]
[GF]
Check (2).
Set it correctly. [GF]
Check (3).
Replace the [B]
functional safety [GF]
unit.
Check (4).
Take
countermeasures
against its cause.
Set it correctly. [GF]
Check (2).
Refer to the
troubleshooting for
the master station
and take
countermeasures.
Check (3).
Set it correctly. [B]
Check (4).
[B]
[GF]