ESAB Heliarc 281iAC/DC, Operating Manual

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introDuction
The Heliarc AC/DC 281i, 283i and 353i are state of the art DC and squarewave AC power sources for SMAW
(MMA) or GTAW (TIG) welding. They utilize inverter based technology in combination with microprocessor con-
trol. The 281i and 283i models are rated 250A / 280A at 100% duty and the more powerful 353i model up to
350A@ 45% duty.
The operator control panel utilizes both rotary knobs together with membrane key-press switches to enable the
precise setting of the required welding parameters. Two easy to read digital displays provide a precise and clear
readout of the various welding data, both preset and actual.
For DC TIG welding applications the units feature both non-contact electronic arc ignition as well as non-HF lift
arc facilities. HF starting is employed for AC TIG but, unlike with other AC TIG systems, the HF is switched off
once the arc is established. This fact means that the possibility of electrical interference from the equipment is
greatly reduced.
The AC/DC 281i can be operated from a 1 Ph 208-240V supply protected with a 50A fuse or circuit breaker. The
AC/DC 283i and 353i require balanced 3Ph 460V industrial supply protected by a 16/32A fuse or circuit breaker
respectively, see specification below.
The power sources are constructed in rugged all metal enclosures incorporating convenient carrying handles.
Multiple fans at the rear provide cooling for the internal components. Full thermal overload protection is stan-
dard.
An auxiliary W.C.U. power receptacle is available on the rear panel when using a Heliarc Water Cooling Unit.
A trolley unit is another option available for these power sources. The Heliarc AC/DC 281i, 283i and 353i are de-
signed, manufactured and tested to meet the requirements of EN60974-1 “Safety Requirements.
section 2 introDuction