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4.05 Preparations for Operating
Follow this set-up procedure each time the system is op-
erated:
Disconnect primary power at the source before dis-
assembling the power supply, torch, or torch leads.
A. Torch Parts Selection
Check the torch for proper assembly and appropri-
ate front end torch parts. The torch parts (shield cup,
tip and electrode) must correspond with the type of
operation (cutting or gouging). Refer to the Instruc-
tion Manual supplied with the Torch Assembly for
proper parts selection.
B. Check primary power source as follows:
1. Check the power source for proper input voltage.
Make sure the input power source meets the
power requirements for the unit per Section 2.03-
A-4, Specifications/Design Features.
2. Connect the input power cable (or close the main
disconnect switch) to supply power to the sys-
tem.
C. Gas Selection
Select desired gas (air or nitrogen). Make sure gas
source meets pressure and flow requirements (refer
to Section 3.08, Gas Connections). Check connection
and turn gas supply on.
OPERATION
WARNING
D. Work Cable Connection
Check for a solid and clean work cable connection to
the workpiece. The area must be free from paint and
rust.
Make a solid work cable
connection to the work-
piece or cutting table
Figure 4-6 Work Cable Connection To Workpiece
E. Torch Connection
Check that the torch is properly connected.
F. Select Output Current
Select the desired current output level for the opera-
tion.
• 15 to 60 amps for standoff cutting and gouging
• 15 to 35 amps for drag cutting
G. Set Operating Pressure
Adjust the gas pressure to 60 psi (4.1 bar or 410 kPa).
The system is now ready for operation.
4.06 Cut Quality
Cut quality requirements differ depending on applica-
tion. For instance, nitride build-up and bevel angle may
be major factors when the surface will be welded after
cutting. Dross-free cutting is important when finish cut
quality is desired to avoid a secondary cleaning opera-
tion.
The following cut quality characteristics are illustrated
in Figure 4-7 below:
Cut Surface
The condition (smooth or rough) of the face of the cut.
20
A-00925
Manual 0-2700
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