Tweco PCM - 102 Machine Torch - Manual (Page 25)

Manual 0-2818 4-1 OPERATION
SECTION 4:
OPERATION
4.01 Introduction
This section provides a description of the PCH & M-102
Torch Assembly followed by operating procedures.
4.02 Functional Overview
The Torch is designed to operate with various Power Sup-
plies to provide a plasma cutting system which can cut
most metals from gauge thickness up to 1 inch (25.4 mm).
Using gouging torch parts the torch can be used for
plasma arc gouging up to 1/4 inch (6.4 mm) wide and
3/16 inch (4.8 mm) deep in a single pass on carbon steel.
NOTE
Refer to Appendix Pages for additional informa-
tion as related to the Power Supply used.
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 power supply, torch
parts, or torch and leads assemblies.
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
Check the power source for proper input voltage.
Close main disconnect switch or plug unit in to sup-
ply primary power to the system.
C. Work Cable
Check for a solid cable connection to the workpiece.
D. Gas Supply
Select desired single gas supply. Make sure gas
sources meet requirements (see Note). Check con-
nections and turn gas supply on.
NOTE
Refer to Appendix Pages for additional informa-
tion as related to the Power Supply used.
E. Power On
Place the ON - OFF Switch on the Power Supply to
the ON position. If the RUN - SET - or RUN - SET -
LATCH switch is in SET position, gas will flow. If
the switch is in RUN position there will be no gas
flow.
F. RUN - SET or RUN - SET - LATCH Switch
If the RUN - SET or RUN - SET - LATCH switch is in
SET position, gas will flow. If the switch is in RUN
position there will be no gas flow.
G. Current Output Level
At the Power Supply, set the desired current output
level to a maximum of 100 amperes. For drag cut-
ting set the control at 35 amps or less only.
H. Pressure Settings
Place the RUN - SET or RUN - SET - LATCH switch
to the SET position. Adjust the gas pressure control
on the Power Supply for the proper gas pressure (see
Note).
NOTE
Refer to Appendix Pages for additional informa-
tion as related to the Power Supply used.
I. Ready for Operation
Return the RUN - SET or RUN - SET - LATCH switch
to RUN position.
NOTES
For general cutting, use the RUN position which
provides normal torch operation where the torch
switch must be held throughout the main arc trans-
fer.
For specific applications, use the LATCH position
where the torch switch can be released after the main
arc transfer. The torch remains activated until the
main arc breaks from the workpiece.
Refer to Appendix 1 for a typical detailed block dia-
gram of Sequence of Operation.
The system is now ready for operation.
Start the pilot arc. On Hand Torches press the Torch Trig-
ger. On Machine Torches press the switch on the Remote
Pendant or supply a Start Signal from the CNC control.
There is a 2 second pre-flow before the arc starts.