Tweco PAK 10 - Manual (Page 18)

Installation 6 Manual No. 0-0515
2.3 EQUIPMENT INSTALLATION
Select a clean, dry location with good ventilation and
adequate working space. Be sure that the air flow into
the unit (from underneath) and out the back is not ob-
structed. A source of 3 phase power and a source of
gases with pressure regulators are required.
Review PRECAUTIONS in the first section of this
manual to be sure that location meets all safety require-
ments.
Most users prefer nitrogen (N2) as the plasma gas and
carbon dioxide (C0
2
) as the secondary gas, since it is
easy to obtain good quality cuts with this combination.
Argon/Hydrogen (Ar/H
2
) (65% argon-35% hydrogen)
is sometimes preferred as the plasma gas when cutting
1/2" to 1" thick aluminum to improve cut finish and
reduce smoke and fumes. Compressed air (free of dirt
and oil) may also be used as the secondary gas.
1
A-03357
Figure 2-B Internal Packing Material
NOTE
A typical 50 lb. CO
2
cylinder is capable of deliv-
ering 35 SCFH on a continuous basis. There-
fore, the manifolding of several CO
2
cylinders
may be necessary to obtain the required torch flow
rate, depending on application and duty cycle.
Connect the unit as follows:
1. Remove the top of the unit as follows:
a. Remove the screws holding the cover.
b. Open the lead connection access door (5, Fig-
ure 2-A).
c. Lift off the cover of the unit.
2. Remove the paper band (1, Figure 2-B) stapled
around the main terminal board.
3. Check for possible loose connections and damage
that may have occurred during shipment.
4. Check the transformer (Figure 2-C) to be sure that
it is set up for the available power. Three terminals
(Figure 2-C) are provided for each phase. As shown
in Figure 2-C, to connect the unit for 460 volts, the
three wires from the input terminals attach to the
three terminals marked 460. For other voltages, the
three wires are connected to the appropriately
marked terminals.
Voltage Connections -
Transformer
A-03358
Figure 2-C Transformer Voltage Connections
CAUTION
Input voltage of the available three phase power
source must correspond to one of the three oper-
ating voltages of the PAK 10. If not properly
connected, damage to the equipment may result.