CHAPTER 9: MALFUNCTIONS 9-7
ALPHA 538/552
AL16: Bar stock moving during headstock reverse!
Description
This alarm is generated when the headstock is
reversing and the bar feeder is maintaining the
bar stock against the turret, stop or tool. This
problem occurs if the bar stock moves forward
while this operation. This means that the turret,
stop or tool is defective, broken or at the wrong
place.
Solution
Check the status and position of the turret, stop or
AL17: Headstock travel shorter than expected!
Description
The overall part length parameter value is too
short or the pusher did not travel the distance that
was programmed in for the overall part length.
Solutions
Check that the Input Overall Part Length
parameter is equal to the travel of the headstock
and not the finished part length.
Check the collet on the pusher. May be broken or
worn or the incorrect size.
Check to see if the pusher got jammed in the
channel. Make sure the front guiding channels
are seated correctly in the channel (maybe chips
fell underneath the guiding channels).
If the problem persists please contact LNS SA for
further information.
AL18: The pusher lost the bar stock while moving back to home position!
Description
This alarm occurs whenever the PLC does not
receive the signal (X17 – SQ6). The problem
occurs if:
· the collet is too big,
· excessive burr on the bar stock prevents the
remnant insertion in the collet,
· any mechanical default prevents the remnant
movement, the switches are defective or
misadjusted.
Solutions
Check the pusher size.
Check the pusher chuck condition.
Check the bar stock (burr).
Check the switch SQ6.
Check any mechanical stop.
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