LNS GT 326-E, Instruction Manual, Page: 139 / 218

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9 TROUBLESHOOTING GUIDE
GT 326-E
AL018 Encoder output error
Clearing Method Turn OFF the power supply and restart the servo drive.
Potential Cause Checking Method Corrective Actions
Encoder itself or the
wiring of encoder is in
error.
Check if the recent fault records (P4-
00 ~ P4-05) display on the drive
keypad in accordance with the
fault codes AL011, AL024, AL025
and AL026.
Perform the corrective actions as
described in AL011, AL024,
AL025 and AL026.
The output frequency
for pulse output may
exceed the limit of its
allowable setting
value.
Check if the following conditions
occur:
Condition 1: Motor speed is above
the value set by P1-76.
Condition 2:
Correctly set P1-76 andP1-46.
1. Ensure that the motor speed
is below the value set by
P1-76.
2.
AL019 Serial communication error
Clearing Method Turn OFF the power supply and restart the servo drive.
Potential Cause Checking Method Corrective Actions
Communication
parameter setting
is defective.
Check the communication parameter
setting.
Correctly set parameter
setting.
Communication
address is
incorrect.
Check the communication address.
Correctly set communication
address.
Communication value
is incorrect.
Check the communication value.
Correctly set communication
value.
AL020 Serial communication time out
Clearing Method Turn OFF the power supply and restart the servo drive.
Potential Cause Checking Method Corrective Actions
Setting value in
time out parameter
is not correct.
Check communication time
out parameter setting.
Correctly set P3-07.
Not receiving
communication
command for a long
time.
Check whether communication cable
is loose or broken.
Tighten the communication cable,
make sure the communication
cable is not damaged and ensure
all wiring is correct.