Installation; Unpacking And Placement - ESAB Heliarc 250 Instruction Manual

SECTION 2

2.1 Installation

Proper installation can contribute materially to the satis-
factory and trouble-free operation of the power source. It
is suggested that each step in this section be studied
carefully and followed as closely as possible.
A. UNPACKING AND PLACEMENT
1. Immediately upon receipt of the power source, it
should be inspected for damage which may have
occurred in transit. Notify the carrier of any defects
or damage at once.
2. After removing the power source from the shipping
container, check the container for any loose parts.
Remove all packing materials.
3. Check air passages at front, bottom, and rear of
cabinet for any packing materials that may obstruct
air flow through the power source.
4. If the machine is not to be installed immediately,
store it in a clean, dry, well-ventilated area.
5. The location of the welding machine should be
carefully selected to ensure satisfactory and de-
pendable service. Using the lifting eyebolt, or a
fork-lift truck, place the power source in the desired
location. Choose a location relatively close to a
properly fused supply of electrical power.
6. The machine's components are maintained at
proper operating temperature by forced air which is
drawn through the cabinet by the fan unit on the rear
panel. The power source is designed to operate up
to a 40 °C (104 °F) ambient temperature. For this
reason, locate the machine in an open area where
air can circulate freely at front, bottom, and rear
openings. Leave at least 2 feet of clearance
between the rear of the power source and wall or
other obstruction.
IMPORTANT: Do not use filters on this unit. Output
ratings are designed and based on an
unobstructed supply of "clean" cooling
air drawn over its internal components. If
cooling air is dirty (e.g., laden with con-
ductive dust), the interior should be
cleaned using low pressure air (see Main-
tenance).
B. PRIMARY (INPUT) ELECTRICAL CONNECTIONS
This welding power source is a single-phase unit and
must be connected to a single-phase power supply.
6
Although designed with line voltage compensation, it is
suggested the unit be operated on a separate circuit to
assure that the performance of the machine is not im-
paired due to an overloaded circuit.
ELECTRIC SHOCK CAN KILL! Do not touch electri-
cally live parts. Be sure that all power is off by
opening the line (wall) disconnect switch when pri-
mary electrical connections are made to the power
source. To be doubly safe, check your input leads
with a voltmeter to make sure that all power is OFF.
1. A line (wall) disconnect switch, with fuses or circuit
breakers, should be provided at the main power
panel (see Fig. 2-1). The primary power input must
have three insulated copper conductors (two power
leads and one ground wire). The wires may be
heavy rubber-covered cable, or may be run in a
solid or flexible conduit. Refer to the following table
for recommended input conductors and line fuse
sizes. Do not connect the input conductors
until step 3.
Table 2-1. Recommended Sizes for Input
Conductors and Line Fuses
Input Requirements
Volts Amps.
Part No. 1341-0355/0356/0357/0358
208 (200) 107
230 96
460 48
Part No. 1341-0366/0367
230 96
460 48
575 38
Part No. 1341-0368
Part No. 1341-0369
220 78
380 45
415 41
440 39
* Sized per National Electric Code for 75°C rated conductors @
30°C ambient. Not more than three conductors in raceway or
cable. Local codes should be followed if they specify sizes other
than those listed above.
2-1
INSTALLATION
Input & Gnd. Time-Delay
Conductor* Fuse Size
CU/AWG Amps.
No. 2 150
No. 2 150
No. 6 70
No. 2 150
No. 6 70
No. 8 60
3 125
6 70
8 60
8 60