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Full Product Manual

ManualsBrandsEverlast ManualsMulti Process Welders250 Amp LightningMTS 275 IGBT Digital Inverter AC-DC MIG/TIG/Stick Multi-Process Welder, HF/Lift TIG Start, 240-Volt
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CONNECTIONS AND POLARITY
STOP!
IMPORTANT!
Read the information on this page and the following pages carefully. It contains important information on
correct polarity of your torches and guns for all processes. Failure to follow these directions can lead to
damage to your welder. Damage occurring from improper polarity may not be covered under warranty.
CAUTION!
Pay attention to the separate DC and AC TIG connections. The AC connector is designed for use in TIG
mode only and serves as the work clamp connection in AC mode. (Stick mode does not provide AC output.)
Even if you switch the machine to AC, you will still need to move the work clamp cable to the AC output ter-
minal connector. The TIG torch will always remain in the negative (-) connector. Remember to switch the
work clamp back to the positive (+) connector when reverting to DC TIG operation. Failure to change the
connector and trying to weld with this conī›žguration may damage your unit.
CAUTION!
Remove TIG and Stick torches and controls while MIG welding. These connections remain live and can
cause the torches to short out against any metal that comes into direct contact. The MIG gun may remain
connected while welding TIG or stick but the nozzle must be insulated from contact. A small rubber hose or
non-conductive tubing may be slid over the tip of the gun to protect it if needed. Do not attempt to MIG weld,
Stick weld or DC TIG weld with the work clamp in the AC port. Damage may occur! Check the polarity be-
fore welding, especially if a another process was recently used.
Section 2 Setup Guide
POLARITY CONNECTIONS
PROCESS TORCH POLARITY WORK POLARITY
MIG (GMAW) + -
FLUX CORED (FCAW) - +
STICK (SMAW) + -
DC TIG (GTAW) - +
AC TIG (GTAW) - AC
IMPORTANT!
Always connect the work clamp directly to the part being welded. Avoid connecting to table tops or bench
legs or indirectly through other items if possible. Loss of power and or poor arc starting may result. This is
also a primary cause of a wandering or unstable arc. Keep work leads in good condition.