Tweco 50 CutMaster - Manual (Page 15)

Manual 0-2805 3-3 INSTALLATION
5. Strip back the insulation on the individual wires
and connect as follows:
• Line 1 wire to main input contactor terminal
L1.
• Line 3 wire to main input contactor terminal
L3.
• Ground wire to Ground (Earth). The Ground
wire connection requires a ring terminal.
6. Replace the Power Supply cover.
7. Connect the input power cable (or close the main
disconnect switch) to supply power to the system.
3.06 Gas Connections
A. Gas Requirements
WARNINGS
This unit is not to be used with oxygen (O
2
).
Maximum pressure at inlet must not exceed 125
psi (8.6 bar)
Gases: Single Gas - Plasma / Secondary
Compressed Air or Nitrogen (N2) Only
Pressure: 70 psi (4.8 bar)
Flow: Cutting - 200 scfh (standard cubic feet / hr) (94.4
lpm)
Gouging - 230 scfh (standard cubic feet / hr) (108.5
lpm)
B. Checking Air Quality
To test the quality of air, place the RUN / SET switch to
SET position, place a welding filter lens in front of the
torch and turn on the gas. Any oil or moisture in the air
will be visible on the lens. Do not initiate an arc!
CAUTION
Air supply must be free of oil, moisture, and other
contaminants. Excessive oil and moisture may
cause double-arcing, rapid tip wear, or even com-
plete torch failure. Contaminants may cause poor
cutting performance and rapid electrode wear.
C. Connecting Gas Supply to Unit
The gas supply connects to the Regulator / Filter Assem-
bly located on the rear of the unit. The connection is the
same for compressed air or high pressure gas cylinders.
If an optional air line filter is to be installed, refer to pro-
cedures in subsection 3.06-D.
1. Connect the gas line to the inlet port. The illustration
shows typical fittings as an example. Other fittings
may be used. Install the fittings and tighten.
NOTE
For a secure seal, apply thread sealant to the fit-
ting threads, according to manufacturer's instruc-
tions. Do Not use Teflon tape as a thread sealer as
small particles of the tape may break off and block
the small gas passages in the torch.
A-02999
Hose Clamp
1/4 NPT to 1/4"
(6mm) Fitting
Regulator/Filter
Assembly
Inlet Port
Gas Supply
Hose
Bowl
Gas Connection to Regulator / Filter Assembly