SMC Networks LECSN-T Series User Manual

8. TROUBLESHOOTING
8 - 40
Alarm No.: 52
Name: Error excessive
Alarm content
・
Droop pulses have exceeded the alarm occurrence level.
Detail
No.
Detail name
Cause
Check method
Check result
Action
52.1
Excess droop
pulse 1
(1)
The servo motor power
cable was
disconnected.
Check the servo motor
power cable.
It is disconnected.
Repair or replace the
servo motor power cable.
It is not
disconnected.
Check (2).
(2)
The connection of the
servo motor is
incorrect.
Check the wiring of
U/V/W.
It is incorrect.
Connect it correctly.
It is correct.
Check (3).
(3)
The connection of the
encoder cable is
incorrect.
Check if the encoder
cable is connected
correctly.
It is incorrect.
Connect it correctly.
It is correct.
Check (4).
(4)
The torque limit has
been enabled.
Check if the limiting
torque is in progress.
The limiting torque is
in
progress.
Increase the torque limit
value.
The limiting torque is
not in progress.
Check (5).
(5)
A moving part collided
against the machine.
Check if it collided.
It collided.
Check operation pattern.
It did not collide.
Check (6).
(6)
The electromagnetic
brake has not released.
(The electromagnetic
brake has been
activated.)
Check if
electromagnetic
brake is released.
It is not released.
Release the
electromagnetic brake.
It is released.
Check (7).
(7)
The torque is
insufficient.
Check the peak load
ratio.
The torque is
saturated.
Reduce the load or
review the operation
pattern. Or use a larger
capacity motor.
The torque is not
saturated.
Check (8).
(8)
Power supply voltage
dropped.
Check the bus voltage
value.
The bus voltage is
low.
Check the power supply
voltage and power
supply capacity.
The bus voltage is
high.
Check (9).
(9)
Acceleration/
deceleration time
constant is too short.
Set a longer
deceleration
time constant, and then
check the
repeatability
It is not repeatable.
Increase the
acceleration/deceleration
time constant.
It is repeatable.
Check (10).
(1
0)
The position loop gain is
small.
Increase the position
loop gain, and then
check the
repeatability.
It is not repeatable.
Increase the position
loop gain ([Pr. PB08]).
It is repeatable.
Check (11).
(11)
The error excessive
alarm level was not set
correctly.
Check the setting of
the error excessive
alarm level.
[Pr. PC24], [Pr.PC43]
It is not set
correctly.
Set it correctly.
It is set correctly.
Check (12).
(12)
Servo motor shaft was
rotated by external
force.
Measure the actual
position under the
servolock status.
It is rotated by
external force./ It was
moved by external
force.
Review the machine.
It is not rotated by
external force./ It was
not moved by
external force.
Check (13).
(13)
Servo-on was enabled
while the servo motor
was rotating.
Measure the actual
position at servo-on.
Servo is enabled
while the servo motor
is rotating.
Servo-on is enabled
while the linear servo
motor is moving.
Review the timing of the
servo-on.
Servo-on is not
enabled while the
Check (14).

SMC Networks LECSN-T Series Specifications

General

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