LNS GT 112-E, Instruction Manual

Page: 41 / 201

4 - 20
Chapter 4 ELECTRICS
GT 112-E
PCB
4.7 SAFETY SWITCHES
The safety switches are used as reminders for user during operation and for safety reasons.
They will impede any handling as long as the bar feeder is not in operational position.
Jumper on TB8 is removed when safety
switches are wired.

Main access cover safety switch (SQ11)
The switch detects whether the main cover is closed or
open. If the main access cover open the bar feeder will
not start in AUTO mode.
When the cover is open, a signal will be sent to PLC
input contact X20, An alarm message “Main cover is
open” is displayed.
Please refer to 4.4 and 4.5 for wiring connection in the
switch.

Optional Retraction safety switches (SQ10)
The switches detect the position of bar feeder to ensure
bar feeder is ready and the lathe can be put in
production.
When bar feeder is ready, the safety switch SQ10 will
operate as the figure A.
Following the procedures on 7.10.2, when bar feeder is
moved, the safety switch SQ10 will operate as the figure
B. A signal will be sent to PLC contact X21 and an
alarm message “AL03” is displayed reminding the
operator to move back bar feeder in the working position
before starting the lathe in production.
Please refer to 4.4 and 4.5 for wire connection in the
switch.
SQ10
&SQ1
0a
SQ11
Fig. A
SQ10
Fig. B
SQ10