Tweco Thermal Arc TA 500 - Manual (Page 21)

Manual No 0-0470 2-1 Installation
SECTION 2:
INSTALLATION
2.1 Unpacking New Equipment
The TA-500 is skid mounted and protected with a carton and
padding material to prevent damage in shipment. The other
components are packed separately. Make sure all items on
the packing list are identified and accounted for. Inspect
components for possible shipping damage.
One copy of the TA-500 Instruction Manual, in a transparent
plastic envelope, is packed in with the TA-500 unit.
2.2 Equipment Installation
Select a clean, dry location with adequate working
space around all components. The power supply is air
cooled and must be located where there is free circula-
tion of air through the machine. At least two feet of
clearance should be provided on all sides of the power
supply to allow for circulation of air and any mainte-
nance that may be required. A source of 3-phase power
and a source of gases with pressure regulators are re-
quired.
Review PRECAUTIONS in the front of the manual to
be sure that the location selected meets all safety re-
quirements.
When cutting material under 3 inches thick most users
prefer Nitrogen (N2) as the plasma gas and water as
the secondary, since it is economical and easy to obtain
good cut quality with this combination. However, CO
2
is sometimes preferred as the secondary.
For material over 3 inches thick Nitrogen (N2) as the
plasma gas and a mixture of 65% Argon/35% Hydro-
gen (Ar/H
2
) as the secondary gas is preferred.
To connect the units, follow these step by step proce-
dures:
Thermal Arc Power Supply
1. Remove the cover and both side panels.
2. Remove the paper band (Fig. 2-A) stapled
around the left motor strut.
3. Check for possible loose connections and dam-
age that may have occurred during shipment.
Paper Band
Figure 2-A Voltage Connection Tag
4. Check the transformer (Fig. 2-A) to be sure that
it is set up for the available power. Section 4.8
describes the connections for the various volt-
ages. Find the one that corresponds to the avail-
able power and compare it to the terminal board
on the transformer. Correct the connections if
necessary.
CAUTION
Input voltage of the available three phase power
source must correspond to one of the three oper-
ating voltages of the TA-500 transformer sup-
plied. If not properly connected, damage to the
equipment may result.
5. Check the three-phase power service to be used.
Recommended maximum fuse or circuit
breaker sizes are given in Table 2-A.
6. With the primary power disconnect switch open
and fuses removed, feed the primary power
cables through the Input fitting in the rear panel
(Fig. 2-C) of the Power Supply. Connect the elec-
trical ground wire to the ground lug (Fig. 2-D).
A proper ground connection must be made to
the brass stud. The other leads are attached to
terminals L1, L2 and L3 (Fig. 2-E). Recom-
mended wire sizes are given in Table 2-A.