Theory Of Operation - Lincoln Electric PRESTO 275 Service Manual

GENERAL DESCRIPTION
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The PRESTO 275 is an inverter based welding power
source that offer multi-mode (STICK and LIFT TIG)
constant current welding. The machines operates on
three phases input voltage 400Vac. The welding
response of this machine is optimized for the stick
(SMAW) welding processes.

THEORY OF OPERATION

275 – WIRING DIAGRAM
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PRESTO
Thanks to their IP23 rating and potted boards this
power source can be used in both factory or field
operations.
Water Cooler is available as an option and has to be
installed on the bottom of the machine.