ESAB A120 - Page 16

CUTMASTER A120
0-5430 INTRODUCTION
2T-3
gas in blowing the molten metal out of the cut allow-
ing for a fast, slag - free cut.
B. Gas Distribution
The single gas used is internally split into plasma
and secondary gases.
The plasma gas ows into the torch through the
negative lead, through the starter cartridge, around
the electrode, and out through the tip orice.
The secondary gas ows 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 electrode
through the torch lead. The positive output is con-
nected 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) circuit.
When the shield cup is properly installed, it closes
a switch. The torch will not operate if this switch is
open.
PIP Sw itch
Sh ield C
up
To
AT C
CNC Start
PIP Sw itch
Sh ield C
up
PIP Sw itch
Sh ield C
up
Remote Pendant
Automation To rch
To AT C
To
AT C
Art # A-08168
Parts - In - Place Circuit Diagram for Machine Torch
A-02997
Torch Trigge
r
PIP Switch
Shield Cup
To Control
Cable Wiring
Torch Switch
Parts - In - Place Circuit Diagram for Hand Torch