SMC Networks LECSB2-T Series User Manual

8. TROUBLESHOOTING
8 - 80
Description
Cause
Checkpoint
Action
RS-422 communication
(Mitsubishi Electric
generalpurpose AC servo
protocol) is not established.
The driver is not set to RS-422
communication protocol.
Check if "communication
protocol selection" in [Pr.
PC71] is correctly set.
Select RS-422/RS-485
communication (Mitsubishi
Electric general-purpose AC servo
protocol).
The communication setting is
not set correctly.
Check if [Pr. PC20 Station
number setting] is set
correctly.
Check [Pr. PC20 Station number
setting] and the station No.
specified by the controller if they are
matched together.
Check if "RS-422
communication
baud rate selection" in [Pr.
PC21] is set correctly.
Check "RS-422 communication
baud rate selection" and the
communication baud rate setting of the
controller if they are matched together.
A communication cable is
malfunctioning
Check if the communication
cable has any failure such as
damage.
Replace the communication cable.
Description
Cause
Checkpoint
Action
They are off-line status.
Check if they are off-line.
Set them to on-line.
A communication cable is
malfunctioning.
Check if the communication
cable
is malfunctioning.
Replace the communication
cable.
For a servo motor with an
electromagnetic brake, the lock
went out.
The electromagnetic brake is
failure due to its life. For the
life of
electromagnetic brake, refer to
"Servo Motor Instruction
Manual (Vol. 3)".
Remove the servo motor and
all wirings from the machine
and check if the servo motor
shaft can be rotated by hands.
(If it is rotated by hands, the
lock is failure.)
Replace the servo motor.
The coasting distance of the servo
motor became longer.
The load was increased and
permissible load to motor
inertia ratio was exceeded.
Check if the load was
increased.
Reduce the load.
An external relay is
malfunctioning. Or the wiring
of MBR (Electromagnetic
brake interlock) is incorrect.
Check the external relay and
wirings connected to MBR
(Electromagnetic brake
interlock) if they are
malfunctioning.
Replace the external relay. Or
review the wiring.
The electromagnetic brake is
failure due to its life. For the
life of electromagnetic brake,
refer to "Servo Motor
Instruction Manual
(Vol. 3)".
Remove the servo motor and
all
wirings from the machine and
check if the servo motor shaft
can be rotated by hands.
(If it is rotated by hands, the
lock is failure.)
Replace the servo motor.
The program operation is not in
progress.
The command speed of the
positioning operation is low.
An abnormal value such as 0
[r/min] was set for specifying
the servo motor speed.
Review the program.
The program stops at the state
of waiting for external signal
on.V
A program input number set
with SYNC command does not
match with the actual inputted
signal.
Review the program or signal to
use.
A point table was executed but
the operation did not start.
A positioning to the same
position is repeated.
Multiple operation starts which
have the same specified
number of point table are in
progress.
Review the setting of the point table
or procedures of the operation.
Positioning to a same point
was endlessly repeated with
automatic continuous operation
"8, 9, 10, 11" was selected in
sub functions of the point table
operation.
Review the setting of the point table
or procedures of the operation.

SMC Networks LECSB2-T Series Specifications

General

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