Mitsubishi Electric MELSERVO-J4 Instruction Manual page 104

1. TROUBLESHOOTING FOR SERVO AMPLIFIER (DRIVE UNIT)
Alarm No.: 95 Name: STO warning
Alarm content
Detail
Detail name
No.
95.1 STO1 off (1) STO1 is not inputted
detection
(2) STO1 was turned off
95.2 STO2 off (1) STO2 is not inputted
detection
(2) STO2 was turned off
95.3 STO warning 1 (1) "Input device - Fixing-
(safety
observation
function)
(2) Set "Input device -
(3) The wiring is incorrect.
(4) The functional safety
(5) 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 STO1 of
correctly. CN8 connector is
wired correctly.
Check if STO1 is off
(enabled) under the (enabled).
following speed
conditions.
1) Servo motor speed:
50 r/min or less
2) Linear servo motor
speed: 50 mm/s or
less
3) Direct drive motor
speed: 5 r/min or
less
Check if the STO2 of
correctly. CN8 connector is
wired correctly.
Check if STO2 is off
(enabled) under the (enabled).
following speed
conditions.
1) Servo motor speed:
50 r/min or less
2) Linear servo motor
speed: 50 mm/s or
less
3) Direct drive motor
speed: 5 r/min or
less
Check if "Input device
diagnosis execution - Fixing-diagnosis
selection at start-up" execution selection at
was not executed. start-up" was
executed.
Check if [Pr. PSD27]
Fixing-diagnosis and [Pr. PSD28] are
execution selection at set correctly.
start-up" correctly using
parameters.
Check if the wiring has
a failure.
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 wired
correctly.
It is wired correctly.
It is off (enabled).
It is not wired
correctly.
It is wired correctly.
It is off (enabled).
It was not executed.
It was executed.
It is not set
correctly.
It is set correctly.
It has a failure.
It has no failure.
It is not repeatable.
It is repeatable.
It has a failure.
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Action Target
Wire it correctly.
[A]
(When not using the [B]
STO function, attach [WB]
the short-circuit [RJ010]
connector came with [GF]
the servo amplifier to
CN8.)
Check (2).
Turn on STO1
(disabled).
Wire it correctly.
(When not using the
STO function, attach
the short-circuit
connector came with
the servo amplifier to
CN8.)
Check (2).
Turn on STO2.
Execute it. [A]
[B]
[GF]
Check (2).
Review the
parameter.
Check (3).
Review the wiring.
Check (4).
Replace the
functional safety unit.
Check (5).
Take
countermeasures
against its cause.