Tweco PAK 44G - Manual (Page 21)

Manual 0-2686 15 INSTALLATION PROCEDURES
This unit connected for ______ volts
Refer to Instruction manual for other voltage conncts.
Discard this label
after connecting input lines.
Input AC
Ground Connection
A-01888
Figure 3-9 Input Ground Connection
3.09 Work Cable And Ground
Connections
The work cable is equipped with a cam-loc plug on one
end and a work clamp on the other. The plug fits into the
work receptacle on the front of the unit and the clamp
attaches to the workpiece.
3.10 Plasma and Secondary Gas
Connections
The following are the plasma and secondary gas require-
ments for the Pak 44G System:
• Plasma Gas Requirements
Plasma Gas
Helium (He), Argon (Ar), Nitrogen (N2), or Ar-
gon/Hydrogen (ArH2), Compressed Air
Pressure
60 psi (3.4 bar)
CAUTION
Maximum input gas pressure must not exceed 125
psi (8.6 BAR)
Hot Flow
22 - 43 scfh (10.4 - 20.3 lpm)
NOTE
Hot flow is measured with the main arc activated.
When pressure is set correctly the plasma gas flow
rate is significantly higher until the arc is initi-
ated.
• Secondary Gas Requirements
Secondary Gas
Compressed Air, Carbon Dioxide (CO2), or Nitro-
gen (N2)
Pressure
70 psi (4.8 bar)
CAUTION
Maximum input gas pressure must not exceed 125
psi (8.6 BAR)
Flow
235 scfh (111 lpm)
NOTE
A typical 50 lb CO2 cylinder is capable of deliver-
ing 35 SCFH on a continuous basis. Therefore,
the manifolding of several CO2 cylinders may be
necessary to obtain the required torch flow rate,
depending on application and duty cycle.
1. Examine each cylinder valve and ensure that it is clean
and free of oil, grease and other foreign matter. Mo-
mentarily open each cylinder valve to blow out any
dust which may be present.
WARNING
Do not Stand in Front of the Valve Outlet during
this Operation.
2. Connect the appropriate regulator to each cylinder
valve. The gas supplies must be equipped with ad-
justable pressure regulators capable of being set be-
tween 0 and 70 psi (4.8 BAR) and of delivering 22
SCFH (10.4 lpm) to 235 SCFH (111 lpm) depending
on the plasma and secondary gas used.
Pressure regulators for use with Pak units and spe-
cifically calibrated for use with nitrogen (Cat. No. 9-
2722) and carbon dioxide (Cat. No. 9-2759) are sup-
plied when a Pak SYSTEM is ordered. They are also
available from Thermal Dynamics as an accessory as
are regulators for argon/hydrogen (Cat. No. 9-3053)
and compressed air (Cat. No. 9-3022).
3. Connect gas supplies to the fittings on the rear panel
of the Pak unit.