LNS GT 112-E, Instruction Manual

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Chapter 4 ELECTRICS
4 - 19
GT 112-E
4.6.3 Signals from the bar feeder to the lathe
a) 24V DC power supply
All the signals from the bar feeder were powered by the 24V DC from the lathe. When the
corresponding relay energized at the bar feeder, the 24V DC is passed through corresponding
contact at bar feeder relay and return to lathe PLC. The lathe PLC hence receives bar feeder
signals.
b) R1 alarm relay
When the bar feeder is in normal operation, the R1 relay is de-energized. In the event of an
alarm or break in the emergency stop loop, this relay is energized and the signal will be sent out
passing through the contact (NO or NC contact is used upon lathe requirement).
For safety reason, this signal should bring to a stop of the axis movements of the lathe as well as
the rotation of the spindle.
c) R2 START signal relay
Relay R2 confirms the action of general part feed out or/and a new bar stock loading is finished.
Refer to service parameter PI13, PI14, PI15 and PI16 for related set up.
d) R3 BAR END (end of bar) relay
When the pusher reaches BAR END position during feed out process, relay R3 energizes. This
signal is used to indicate that the rest bar stock length is not long enough to machine a complete
part according to part length set at P02.
Machining a workpiece which requires multiple chuck openings, this position must set according
to the longest length of those different machining sections.
Refer to operation parameter P02, P10, P13 and service parameter PI17, PI18, PI19, PI20, PI32
and PI33 for further information.
e) R4 bar feeder in auto relay
This signal is present as soon as the bar feeder is switched into automatic mode (AUTO READY
+ AUTO START)
f) R5 INCHING relay
This relay energizes under circumstances described below during a bar change process:
1. The loading flag is moving forward for place the bar stock at FIRST FEED position (behind the
vise jaws).
2. The pusher is moving forward for advancing the bar stock to TOP CUT position after insertion
in the collet of the pusher.
For bar stocks without proper preparation or profiled material may struggle to enter the chuck.
Generally the spindle rotates at slow speed when the new bar stock is passing through. For
lathes not able to rotate the spindle with the chuck open this signal can be used as an external
command to turn the spindle.
Refer to service parameter PI43 for more information.