YASKAWA FS100 Maintenance Manual page 235

Alarm Alarm Name Sub
Number Code
4318 SERIAL ENCODER
CORRECTION LIMIT
Meaning Cause
Interference error
Connection failure
Connection failure
Connection failure
Servo control board failure
Module failure (amplifier)
Module failure
Maintenance failure
Defective speed reducer
Sub Code: Signifies the axis in Connection failure
which the alarm occurred
Module failure (encoder)
Remedy
Remove the following interferences.
·The interferences to the jigs of Robot.
·The interferences to the jigs of workpieces.
·If there is no interference between robot and workpieces, set the shock
detection level to more than maximum eternal value. Up to 500% of the level is
possible.
(1)Reset the alarm.
(2)If the alarm occurs again, check the connection and inserting state of the
following cables and connectors.
·The motor power line
·The encoder line
(1) If the alarm occurs again, check the wiring of phase-U, -V, and -W isn't
disconnected.
(2) If disconnected, replace the motor power wire.
(1) Check that the motor brake wire is not disconnected.
(2) If disconnected, replace the motor brake wire.
(1)Reset the alarm
(2)If the alarm occurs again, replace controller. Save the CMOS.BIN before
replace controller to be safe.
(1)Reset the alarm
(2)If the alarm occurs again, replace controller. Save the CMOS.BIN before
replace controller to be safe.
(motor) (1)Reset the alarm
(2)If the alarm occurs again, replace the motor.
Measure the density of grease iron powder in the speed reducer and do the
maintenance.
Replace the speed reducer or the grease of it.
(1)Reset the alarm
(2)If the alarm occurs again, check the connection and inserting state of the
following cables and connectors.
{Robot axis}
·Cable between encoders
{External axis}
·Cable between encoders
(1)Reset the alarm.
(2)If the alarm occurs again, replace the encoder.
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