SMC Networks LECSN-T Series User Manual

8. TROUBLESHOOTING
8 - 50
Alarm No.: 7D
Name: Safety observation error
Alarm content
・
The safety observation function detected an error.
Detail
No.
Detail name
Cause
Check method
Check result
Action
7D.1
Stop
observation
error
(1)
During activation of
SOS function, the
position of the servo
motor has changed by
more than the SOS
allowance value set by
parameter
Check that the actual
servo motor position is
higher than the setting
value of [Pr. PSA05].
The travel distance of
the
servo motor is larger
than the setting value
in [Pr.PSA05].
Review the alarm level.
The travel distance of
the servo motor is
smaller than the
alarm detection
level.
Check (2).
(2)
During activation of
SOS function, the servo
motor speed has
changed by larger than
the SOS allowance
value set by parameter,
and that state has
continued for longer
than the set time
(specified by
[Pr.PSA15]).
The actual servo motor
speed is higher than
the setting value of
[Pr.PSA04].
The servo motor
speed is
higher than the
setting value in [Pr.
PSA04].
Review the parameter
setting.
The servo motor
speed is higher than
the setting
value in [Pr. PSA15]
and equal to or lower
than that in
[Pr.PSA04].
Check (3).
(3)
During activation of
SOS function, the
speed command has
changed by larger than
the SOS allowance
value set by parameter,
and that state has
continued for longer
than the set time
(specified by [Pr.
PSA15]).
Check if the command
from the controller is
over
the standstill speed set
in
[Pr. PSA04].
The command from
the controller is over
the setting valued in
[Pr.PSA04].
Check the operation
pattern.
The command from
controller is higher
than
the setting value in
[Pr.PSA15] and equal
to or lower than that
in [Pr.PSA04].
Check (4).
(4)
An encoder is
malfunctioning.
Replace the servo
motor,and then check
the repeatability.
It is not repeatable.
Replace the servo motor.
It is repeatable.
Check (5).
(5)
The functional safety unit
is malfunctioning.
Replace the functional
safety unit, and then
check the
repeatability.
It is not repeatable.
Replace the functional
safety unit.
It is repeatable.
Check (6).
(6)
The driver is
malfunctioning.
Replace the driver, and
then check the
repeatability.
It is not repeatable.
Replace the servo motor.
It is repeatable.
Check (7).
(7)
Something near the
device caused it.
Check the noise,
ambient temperature,
vibration, etc.
There is a problem in
the surrounding.
Take countermeasures
against its cause.
7D.2
Speed
observation
error
(1)
The command pulse
frequency is high.
Check the command
pulse frequency.
The command pulse
frequency is high.
Check operation pattern.
The command pulse
[GF] frequency is low.
Check (2).
(2)
The settings of the
electronic gear are
incorrect.
Check the setting value
of the electronic
gear.
The setting value is
incorrect.
Review the settings.
The setting value is
correct.
Check (3).
(3)
The command from the
controller is
excessive.
Check if the command
from the controller is
the SLS speed ([Pr.
PSA11] to [Pr. PSA14])
or more.
It is over the
permissible speed.
Check operation pattern.
It is less than the
permissible speed.
Check (4).
(4)
A larger speed
command than the SLS
speed ([Pr. PSA11] to
[Pr. PSA14]) was
inputted.
Check that the actual
servo motor speed is
higher than the setting
value of the SLS
speed.
The servo motor
speed is higher than
the SLS speed.
Review the setting value
of the SLS speed.
The servo motor
speed is lower than
the SLS speed.
Check (5).
(5)
The servo system is
Check if the servo
It is oscillating.
Adjust the servo gain. Or

SMC Networks LECSN-T Series Specifications

General

Brand	SMC Networks
Model	LECSN-T Series
Category	Controller
Language	English