LNS Alpha 538 - Alarm Codes and Descriptions (AL07-AL09)

CHAPTER 9: MALFUNCTIONS 9-4
ALPHA 538/552
AL07: SQ3 switch failure during the channel opening!
Description
This alarm is generated whenever the PLC does
not receive the signal (X14 – SQ3). The problem
occurs if the switch SQ3 is defective or
misadjusted or if the opening mechanism has a
malfunction.
Solutions
Check the switch SQ3.
Check the locking mechanism.
Press the STOP button on the remote control to
reset the alarm.
AL08: SQ4 switch failure during the channel closing!
Description
This alarm is generated whenever the PLC does
not receive the signal (X15 – SQ4). The problem
occurs if the switch SQ4 is defective or
misadjusted or if the closing mechanism has a
malfunction.
Solutions
Check the switch SQ4.
Check the closing mechanism.
Press the STOP button on the remote control to
reset the alarm.
AL09: SQ1 switch (measuring cell) failure!
Description
SQ1 switch failure
Solutions
Check the switch SQ1