Tweco 75XL Plus PAK Master - Manuel (Page 28)

INSTALLATION 3-10 Manual 0-2807
3.11 Tip Saver/Drag Cut Sensing
Circuit
This power supply is equipped with a Tip Saver/Drag
Cut Sensing Circuit which cuts current back to 35 amps if
the tip touches the workpiece. The purpose of this is to
prolong the life of the tip.
If the user does not want the current to be decreased when
the tip touches the workpiece, the sensing circuit can be
defeated by closing switch SW1-1 on the Gate/Logic PC
Board. Slide top white toggle on SW1-1 to the right to
close circuit.
A-02569
Gate/Logic PC Board
SW1
1 2
ON
Figure 3-12 SW1 Switch Location
WARNING
Tip life will be considerably shortened if tip is re-
peatedly touched to the workpiece without the Tip
Saver/Drag Sensing Circuit feature active.
3.12 External Control Connections
External control signal connections can be made to the
Rear Panel of the power supply. Connections can be made
to interface with CNC Controls, Standoff Control SC11
or Remote Hand Pendant.
Depending on the option installed determines how the
option is connected to the Power Supply.
A. Computer Control Interface (CNC)
NOTE
Used when Standoff Control SC11 are not used.
The computer control interface (CNC) allows an auto-
mated system to interface with a computer or other con-
trol device.
CNC cables can be interfaced to the Power Supply using
one of the following methods:
NOTE
Refer to Appendix III for CNC Interface Schematic.
• Connector (J22) at the rear of the Power Supply
• Internal terminal block in the Power Supply
Depending on the equipment ordered and the cables sup-
plied connect the CNC cable per one of the following:
1. Using supplied CNC cable
Connect the supplied Power Supply/CNC Cable
to the Power Supply rear panel connector J22
(CNC Control).
2. Using customer supplied CNC Cable
a. Remove the Left Side Panel from the Power
Supply as viewed from the front of the unit.
b. Remove the 7/8" knockout from the Rear
Panel and install a 1/2" NPT strain relief (not
supplied) into the hole.