9-2 CHAPTER 9: MALFUNCTIONS
ALPHA 552
1. ALARMS
AL01: Emergency Stop Line is open !
Description
The lathe or the bar feeder goes into an emergency stop
condition and does not receive signal (I16). The problem is
generated anytime there is an open in the safety circuit.
Solutions
Check the PLC connection.
Check the wiring according to the electrical diagram.
Check the emergency buttons state on the bar feeder and the
lathe.
Press the STOP button on the remote control to reset the
alarm.
AL02: Main Access Cover Open!
Description
The PLC does not detect input (I6 – SQ11). The problem is
generated when the main access cover on the bar feeder is
open, exposing automated mechanical parts.
Solutions
Close the cover.
Check the SQ11 switch.
AL03: Bar Feeder
Description
The problem is generated when the bar feeder is retracted in
reduction tube change position or if the retraction system is
not locked.
Solutions
Put back the bar feeder in working position.
Check the SQ10 switch.
Press the STOP button on the remote control to reset the
alarm.
AL04: Oil pressure failure!
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