LNS Alpha ST 320 - Alarm 16 - Bar Stock Moving Forward; Alarm 17 - Pusher Moving Length too Shorter; Alarm 18 - Guiding Channel Malfunction Closing

CHAPTER 9: MALFUNCTIONS
ALPHA ST 320
9-6
1.15 Alarm 16 – Bar Stock Moving Forward
e 1 6 : B A R S T O C K M O V I N G
Alarm16:
F O R WA R D !
This alarm only occurs on sliding headstock machines.
Description :
When the chuck is opened the bar is normally pushed against the stopper and
can not move. If the bar moves more than 160mm while the chuck is open this
alarm occurs. If the pusher loses the bar end during a production cycle the pusher
can move past the bar end. If during a production cycle the pusher moves more
than the part length (parameter F2) + 50mm this alarm occurs.
Solution :
Check the turret stop on the lathe.
Check that the bar end is in the collet.
1.16 Alarm 17 – Pusher Moving Length Too Shorter
e 1 7 : P U S H E R M O V I N G
Alarm17:
L E N G T H T O O S H O R T E R
Description :
Sliding headstock machines: The distance the pusher moves between each
chuck opening is measured. If it is smaller than the part length (parameter F2)
this alarm occurs.
Fixed Type Lathe: Feed out distance must be equal to the part length (parameter
F2).
Solution :
Check parameter F2.
Make sure that nothing is blocking the pusher and that there are no parts or dirt in
the channel.
Make sure there is no chips between the front of the bar and the turret stop.
1.17 Alarm 18 – Guiding Channel Malfunction Closing
e 1 8 : G U I D I N G C H A N N E L
Alarm18:
M A L F U N C T I O N C L O S I N G !
Description :
Limit switches SQ5 (open position) and SQ3 (close position) are both activated at
the same time.
Solution :
Check the adjustment of the limit switches.
Check that the switches function. Replace if necessary.
Check wiring of limit switches to PLC.