Manual 0-2815 2-3 INTRODUCTION & DESCRIPTION
E. 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.
F. Interlocks
One pressure switch acts as an interlock for the gas
supply. If supply pressure falls below minimum re-
quirements the pressure switch will open, shutting
off the DC power, and the GAS indicator will go off.
When adequate gas supply pressure is available the
pressure switch will close, allowing power to be re-
sumed for cutting.
G. Parts-In-Place (PIP)
The torch head has built-in contacts called Parts-In-
Place (PIP). These two contacts are made through the
canted coiled spring inside the shield cup when it is
installed. The torch will fail to operate if these con-
tacts are not made.
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