Tweco PCM-120 Machine Torch - Manual (Page 21)

Manual 0-2698 4-1 OPERATION
SECTION 4:
OPERATION
4.01 Introduction
This section provides a description of the Torch Assem-
bly followed by operating procedures.
4.02 Functional Overview
The Torch is designed to operate with the PakMaster
150XL Plasma Power Supply to provide a cutting system
which can cut most metals from gauge thickness up to
1-1/2 inches (38.1 mm). With a quick change of torch
parts the torch can be used for plasma arc gouging.
4.03 Getting Started
This procedure should be followed at the beginning of
each shift:
WARNING
Disconnect primary power at the source before as-
sembling or disassembling stacked modules, indi-
vidual modules, torch parts, or torch and leads as-
semblies.
A. Torch Parts
Check the torch for proper assembly. Install proper
torch parts for the desired application (refer to Sec-
tion 4.04, Torch Parts Selection).
B. Input Power
1. Check the power source for proper input voltage.
2. Make sure that the Power Supply is set for the
proper input voltage (refer to Power Supply Op-
erating Manual for connections).
3. Close main disconnect switch or plug unit in to
supply primary power to the system.
C. Work Cable
Check for a solid work cable connection to the work-
piece.
D. Gas Supplies
Select desired gas supplies. Make sure gas sources
meet requirements (refer to Section 2.03, Specifica-
tions & Design Features and 3.07, Gas Selection).
Check connections and turn gas supplies on.
E. Purge System
Place the Power Supply ON/OFF switch to the ON
position. An automatic gas purge (pre-flow) will re-
move any condensation that may have accumulated
in the torch and leads while the system was shut
down. The torch cannot be activated during the purge
cycle (pre-flow). After the purge is complete, if the
RUN/SET switch is in SET position, gas will flow. If
the switch is in RUN position there will be no gas
flow.
F. Current Output Level
At the Power Supply set the desired current output
level to a maximum of 120 amperes.
G. Pressure Settings
Place the RUN/SET switch to the SET position. Ad-
just PLASMA gas pressure control to 65 psi (4.5 bar)
and SECONDARY gas pressure controls to 60 psi (4.1
bar).
H. Ready for Operation
Return the RUN/SET switch to RUN position.
The system is now ready for operation.
NOTE
Refer to Appendix 2 for a detailed block diagram of
the Sequence of Operation.
4.04 Torch Parts Selection
Depending on the type of operation to be done (standoff
cutting, drag cutting or gouging) determines the torch
parts to be used.
Torch parts:
Shield Cup, Cutting Tip, Electrode, Gas Distributor,
and Cooling Tube (Cooling Tube for Gouging Only).
Refer to Figure 4-1 for the various torch parts.
CAUTION
Do not interchange parts. Make sure both the tip
and electrode in the torch correspond with the
plasma and secondary in use and the type of op-
eration (cutting or gouging).