Input Connections - ESAB 350mpi Instruction Manual

SECTION 2
E. The location of the power source should be
carefully selected to ensure satisfactory and
dependable service. Choose a location rela-
tively close to a properly fused source of
electrical power.
F. The machine components are maintained at
proper operating temperatures by forced air
which is drawn through the cabinet by the fan
unit. For this reason, it is important that the
machine be located in an open area where air
can circulate freely at front and rear openings.
If space is at a premium, leave at least 1 foot
(300 mm) of clearance between the rear of
the power source and wall or other obstruc-
tion. The area around the unit should be
relatively free of dust, fumes, and excessive
heat. It is also desirable to locate the unit so
the cover can be removed easily for cleaning
and maintenance.

2.4 INPUT CONNECTIONS

ELECTRIC SHOCK CAN KILL! Precautionary mea-
sures should be taken to provide maximum protec-
tion against electrical shock.
Be sure that all power is OFF by opening the line
(wall) disconnect switch when primary electrical
connections are made to the power source.
To be doubly safe, check your input leads with a
voltmeter to make sure all power is OFF.
2.4.1 230/460V Model
NOTE
As shipped from the factory, the ESAB 350mpi, 230/
460 V model, is set for 460 volts input. If you will be
operating the machine from a 230 V source, open
the switch access panel on the rear panel on the
machine and flip the Voltage Selector Switch to the
230 V position.
2.4.2 575V Model
575 Vac input models are single voltage units and
therefore do not require any installation prepara-
tion for input line voltage.
2.4.3 400/440V Model
As shipped from the factory, the ESAB 350mpi, 400/
440 V model, is set for 440 volts input. If you will be
operating the machine from a 400 V source, open
the switch access panel on the rear panel on the
machine and flip the Voltage Selector Switch to the
400 V position.
The ESAB 350mpi is designed to compensate for line
voltage variations of plus or minus 10 percent from the
rated level while maintaining rated output, without dam-
age to internal components. If line voltage fluctuations
exceed this range, serious damage could occur. There-
fore, prior to installation, it is recommended that the line
voltage of the supply circuit be measured at several
times during the day. If fluctuations beyond the +/-10%
level are detected, another supply circuit should be
selected, or the local power company should be asked
to adjust the supply. In addition, certain types of factory
equipment can cause rapid voltage swings (transients)
which can cause the ESAB 350mpi safety circuits to
"trip". Examples of such equipment are resistance
welders, punch presses, and starting of large electric
motors.
Input Power Cable (Figure 2-3). Before installing the
power cable, make sure there is a line (wall) disconnect
switch with fuses or circuit breakers at the main power
panel. You may either use the factory-installed input
power cable (No. 8 AWG, 4/c, type SO (90 °C), 12 ft (3.7
m) length) or provide your own input power leads. If you
choose to provide your own, make sure they are insu-
lated copper conductors. You must have two (single-
phase) or three (three-phase) 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 Table 2-1 for recommended input conductors and
line fuse sizes.
14
INSTALLATION
NOTE