SMC Networks LECSN-T Series User Manual

8. TROUBLESHOOTING
8 - 51
unstable and oscillating.
motor is oscillating.
reduce the load.
It is not oscillating.
Check (6).
(6)
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 (7).
(7)
The connection
destination of the
encoder cable is
incorrect.
Check the connection
destination of the
encoder.
It is not correct.
Wire it correctly.
It is correct.
Check (8).
(8)
The encoder or linear
encoder is
malfunctioning.
Replace the servo
motor,
and then check the
repeatability.
It is not repeatable.
Replace the servo motor.
It is repeatable.
Check (9).
(9)
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 (10).
(10)
The driver is
malfunctioning.
Replace the driver, and
then check
the repeatability.
It is not repeatable.
Replace the driver.
It is repeatable.
Check (11).
(11)
Something near the
device caused it.
Check the noise,
ambient temperature,
etc.
There is a problem in
the
surrounding.
Take countermeasures
against its cause.
Alarm No.: 8A
Name: USB communication time-out error/serial communication time-out error/Modbus RTU
communication time-out error
Alarm content
・Communication between the driver and a personal computer/controller stopped for the
specified time or longer.
・An error occurred in USB communication, serial communication (Mitsubishi Electric general-
purpose
Detail
No.
Detail name
Cause
Check method
Check result
Action
8A.1
USB
communication
time-out error/
serial
communication
time-out error
(1)
Communication
commands have not
been transmitted.
Check if a command
was
transmitted from the
personal computer,
etc.
It was not
transmitted.
Transmit a command.
It was transmitted.
Check (2).
(2)
A communication cable
was disconnected.
Replace the
communication cable,
and then check the
repeatability.
It is not repeatable.
Replace the
communication cable.
It is repeatable.
Check (3).
(3)
The driver is
malfunctioning.
Replace the driver, and
then check
the repeatability.
It is not repeatable.
Replace the driver.

SMC Networks LECSN-T Series Specifications

General

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