1. TROUBLESHOOTING FOR SERVO AMPLIFIER (DRIVE UNIT)
1 - 66
Alarm No.: 68
Name: STO diagnosis error
Alarm content
An error of STO input signal was detected.
Detail
No.
Detail name
Cause
Check method
Check result
Action
Target
68.1 Mismatched
STO signal
error
(1) STO1 and STO2 are
not inputted correctly.
Check if the STO1
and STO2 of CN8
connector are wired
correctly.
It is not wired
correctly.
Wire it correctly.
[A]
[B]
[WB]
[GF]
It is wired correctly.
Check (2).
(2) The input states of
STO1 and STO2 are
different.
Check the on/off
states of STO1 and
STO2.
The on/off states of
STO1 and STO2 are
different.
Set STO1 and STO2
to the same input
states.
The on/off states of
STO1 and STO2 are
the same.
Check (3).
(3) The setting of [Pr. PF18
STO diagnosis error
detection time] ([Pr.
PX43] for when the J3
extension function is
used) is incorrect.
Set a longer time in
the parameter, and
then check the
repeatability.
It is not repeatable.
Review the
parameter setting.
It is repeatable.
Check (4).
(4) The STO circuit is
malfunctioning.
Replace the servo
amplifier, and then
check the
repeatability.
It is not repeatable.
Replace the servo
amplifier.
It is repeatable.
Check (5).
(5) Something near the
device caused it.
Check the noise,
ambient temperature,
etc.
It has a failure.
Take
countermeasures
against its cause.
Содержание MELSERVO MR-J4-B-RJ Series
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