SMC Networks LECSB2-T Series User Manual

8. TROUBLESHOOTING
8 - 31
(5)
The regenerative load
ratio exceeded 100%.
Check the regenerative
load ratio when alarm
occurs.
It is 100% or more
Reduce the frequency of
positioning. Increase the
deceleration time
constant. Reduce the
load. Use a regenerative
option if it is not being
used. Review the
regenerative option
capacity.
30.2
Regeneration
signal error
(1)
A detection circuit of the
driver is
malfunctioning.
Check if the
regenerative
resistor (regenerative
option) is
overheating.
It is overheating
abnormally.
Replace the driver.
30.3
Regeneration
feedback signal
error
(1)
A detection circuit of the
driver is malfunctioning.
Remove the
regenerative option or
built-in regenerative
resistor, and then
check if the alarm
occurs at power on.
The alarm occurs.
Replace thedriver.
The alarm does not
occur.
Check (2).
(2)
Something near the
device caused it.
Check the noise,
ground fault, ambient
temperature, etc.
There is a problem in
the surrounding.
Take countermeasures
against its cause.
Alarm No.: 31
Name: Overspeed
Alarm content
・The servo motor speed has exceeded the instantaneous permissible speed.
Detail
No.
Detail name
Cause
Check method
Check result
Action
31.1
Abnormal motor
speed
(1)
The command pulse
frequency is high.
Check the command
pulse frequency.
The command pulse
frequency is high.
Check operation pattern.
The command pulse
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 (5).
(3)
The servo motor was at
the maximum torque
(maximum thrust) at the
time of acceleration.
Check if the torque
(thrust) at the time of
acceleration is the
maximum torque
(maximum thrust).
It is the maximum
torque
(maximum thrust).
Increase the
acceleration/deceleration
time constant. Or reduce the
load.
It is less than the
[GF]
maximum torque
(maximum thrust).
Check (6).
(4)
The servo system is
unstable and
oscillating.
Check if the servo
motor
is oscillating.
It is oscillating.
Adjust the servo gain. Or
reduce the load.
It is not oscillating.
Check (7).
(5)
The velocity waveform
has overshot.
Check if it is
overshooting because
the acceleration time
constant is too short.
It is overshooting.
Increase the
acceleration/deceleration
time constant.
It is not
overshooting.
Check (8).
(7)
The connection of the
servo motor is
incorrect.
Check the wiring of
U/V/W.
It is incorrect.
Set it correctly.
It is correct.
Check (11).
(8)
The encoder or linear
encoder is
malfunctioning.
Check if the alarm is
occurring during less
than instantaneous
permissible speed.
It is occurring during
less than
instantaneous
permissible speed.
Replace the servo motor.

SMC Networks LECSB2-T Series Specifications

General

Brand	SMC Networks
Model	LECSB2-T Series
Category	DC Drives
Language	English