ESAB Heliarc 161 Instruction Manual page 12

SECTION 1
1.0 INTRODUCTION
The Heliarc 161 is an inverter based AC/DC power source
with squarewave output suitable for both TIG (GTAW)
and STICK (SMAW) welding. The unit operates from
230Vac single phase input power (see specification) and
supplies up to 160A welding output at 35% duty cycle.
Front panel controls enable the operator to set output
mode, start current, welding current, current slope down
time and gas post flow time.
Built into the unit is an electronic non-contact arc ignition
system, note that the unit initiates the TIG arc in "DC
mode" even when AC output is selected. Once the arc is
struck the unit alternates the output current in AC mode.
The AC frequency is not locked to main frequency (60Hz)
but is varied automatically depending on the preset out-
put weld current level. Front panel AC balance control
provides either greater AC cleaning action or penetra-
tion as desired.
The unit provides both 2 and 4 stroke torch switch op-
eration as well as "Touch Start" (Non-HF) arc starting. A
14 pin remote control socket enables a remote current
or arc start control to be used. Two axial fans mounted in
the rear of the housing cool the internal semiconductor
components. A thermal sensor protects the components
from excessive temperatures if the duty is exceeded.
1.1 UNPACKING AND PLACEMENT
A. Immediately upon receipt of the equipment, inspect
for damage which may have occurred in transit.
Notify the carrier of any defects or damage at once.
B. After removing the components from the shipping
container(s), check the container for any loose
parts. Remove all packing materials.
C. Check air passages of power source for any packing
materials that may obstruct air flow through the
power source.
D. If the equipment is not to be installed immediately,
store it in a clean, dry, well-ventilated area.
E. The location of the welding equipment should be
carefully selected to ensure satisfactory and de-
pendable service. Choose a location relatively close
to a properly fuse source of electrical power. The
Heliarc 161 should be placed within easy reach of
the object to be welded.
F. The machine components are maintained at proper
operating temperatures by forced air which is drawn
through the cabinet by the fan unit on the rear panel.
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 of clearance between
the rear of the power source and wall or other
obstruction. The area around the unit should be
relatively free of dust, fumes, excessive heat, mois-
ture and corrosive vapors.
1.2 RADIO INTERFERENCE
A. ESAB welding power sources have been designed
to high standards of electromagnetic compatibility.
However, arc welding, by its very nature, generates
radio-frequency energy and may cause interference.
By installing and using the equipment correctly, in
accordance with these instructions, the problems of
interference may be minimized.
B. Before installing this welding equipment an assess-
ment should be made of potential problems that may
occur. It is good practice not to install welding equip-
ment next to computers or safety critical control cir-
cuits, eg electronic machine guards, unless they have
been suitably protected.
C. Primary cabling and welding cables should be kept
separate from other main wiring and control, signal-
ling or communications (eg telephone) cables. If in-
terference occurs then greater separation or re-rout-
ing should be considered. Welding cables should be
kept as short as practically possible.
D. Interference may also be reduced by separating the
welding equipment from the other equipment af-
fected. A partition, brick wall or particularly, a metal
screen will also reduce interference. Proper equip-
ment grounding (earthing or bonding) must be imple-
mented and maintained.
E. This equipment should be routinely maintained ac-
cording to the manufacturers instructions and using
only approved spare parts.
F. All access and service covers must be closed and
properly fastened when the equipment is being used.
This equipment should not be modified in any way
except for those changes and adjustments approved
by the manufacturer.
12
GENERAL