Mitsubishi Electric MR-J4-TM Instruction Manual page 292

8. TROUBLESHOOTING
Alarm No.: 95 Name: STO warning
Alarm content
Detail
Detail name
No.
95.4 STO warning 2 (1) The test operation
(safety
observation
function)
(2) An error occurred in
(3) "Input mode selection"
(4) The servo amplifier is
(5) The functional safety
(6) Something near the
STO input signal turns off while the servo motor stops.
A diagnosis of input devices was not executed.
The safety observation function was enabled in the test mode.
Cause
Check if the servo
mode was not set amplifier and
correctly. functional safety unit
are set to the test
operation mode.
Check the description
safety communication. "Initialization
communication with
the controller has not
completed." of the
section 8.5.
Set [Pr. PSA02]
in [Pr. PSA02 correctly and check
Functional safety unit the repeatability.
setting] is not set
correctly.
Replace the servo
malfunctioning. amplifier, and then
check the
repeatability.
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 not set.
It is set.
It is not repeatable.
It is repeatable.
It is not repeatable.
It is repeatable.
It is not repeatable.
It is repeatable.
It is not repeatable.
It is repeatable.
It has a failure.
8 - 11
Action Target
Set it correctly. [TM]
Check (2).
Take
countermeasures
against its cause.
Check (3).
Review the
parameter.
Check (4).
Replace the servo
amplifier.
Check (5).
Replace the
functional safety unit.
Check (6).
Take
countermeasures
against its cause.