Tweco A40-A60 CutMaster - Manual (Page 23)

CUTMASTER A40, A60
Manual 0-5120 INTRODUCTION 2T-3
B. Gas Distribution
The single gas used is internally split into plasma
and secondary gases.
The plasma gas flows into the torch through
the negative lead, through the starter cartridge,
around the electrode, and out through the tip
orifice.
The secondary gas flows down around the outside
of the torch starter cartridge, and out between the
tip and shield cup around the plasma arc.
C. Pilot Arc
When the torch is started a pilot arc is established
between the electrode and cutting tip. This pilot
arc creates a path for the main arc to transfer to
the work.
D. Main Cutting Arc
DC power is also used for the main cutting arc.
The negative output is connected to the torch elec-
trode through the torch lead. The positive output
is connected to the workpiece via the work cable
and to the torch through a pilot wire.
E. Parts - In - Place (PIP)
The torch includes a 'Parts - In - Place' (PIP) cir-
cuit. When the shield cup is properly installed, it
closes a switch. The torch will not operate if this
switch is open.
PIP Switch Shield Cup To ATC
CNC Start
PIP Switch Shield Cup
PIP Switch Shield Cup
Remote Pendant
Automation Torch
To ATC
To ATC
Art # A-08168
Parts - In - Place Circuit Diagram for Machine Torch
A-02997
Torch Trigger
PIP Switch Shield Cup
To Control
Cable Wiring
Torch Switch
Parts - In - Place Circuit Diagram for Hand Torch