Tweco CE PAK Master 150XL With Latch Circuit - Manual (Page 31)

Manual 0-2865 4-5 OPERATION
C. Torch Parts Selection
Check the torch for proper parts assembly. Install
proper torch parts for the application (refer to Torch
Instruction Manual).
D. Primary Input Power Source
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, Specifica-
tions/Design Features.
Connect the input power cable (or close the main dis-
connect switch) to supply power to the system.
E. Plasma Gas Supply Selection
Select desired plasma gas. Make sure gas sources
meet requirements (refer to Torch Instruction
Manual). Check connections and turn plasma gas
supply on.
F. Secondary Gas Supply Selection
Select desired secondary gas. Make sure gas sources
meet requirements (refer to Torch Instruction
Manual). Check connections and turn secondary
supply on.
G. Work Cable Connection
Check for a solid and clean work cable connection to
the workpiece. The area must be free from paint and
rust.
A-02081
Figure 4-5 Work Cable Connection to Workpiece
H. Torch Connection
Check that torch is properly connected.
I. Plasma Gas Purge (Pre-Flow)
Move the ON/OFF switch to ON position. To start
the pre-flow move the RUN/SET switch to SET posi-
tion for a minimum of 20 seconds. The gas purge
will remove any moisture that may have accumulated
in the torch and leads while the system was shut
down. The torch cannot be activated during gas
purge process.
J. Current Output Level Selection
Select the desired current output level for the opera-
tion.
• 30-120 amps for standoff cutting and gouging
• 30 - 35 amps for drag cutting
K. Set Operating Pressure
Move the RUN/SET switch to SET position. Set
plasma and secondary pressures. Adjust the gas pres-
sure to 65 psi (4.5 bar) for plasma and 60 psi (4.1 bar)
for secondary. Return the RUN/SET switch to RUN
position.
L. STANDARD/LATCH Switch Selection
Place the STANDARD/LATCH switch to either
STANDARD or LATCH position as follows:
For general cutting, use the STANDARD position
which provides normal touch operation where the
torch switch must be held throughout the main
arc transfer.
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.
M. Ready for Operation
The system is now ready for operation.
NOTE
Refer to Appendix 2 for a detailed block diagram of
the Sequence of Operation.
4.05 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 4-6:
Cut Surface
The condition (smooth or rough) of the face of the
cut.
Bevel Angle