Lincoln Electric IM520 SQUARE WAVE TIG 255 - Manual (Page 17)

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• Strain relief holes in base for welding cables, gas
and water hoses and control cables.
• Easy access for input connections. Connections
are simple strip and clamp of input wires (no lugs
required).
• Low fan noise at idle.
• Modular construction for easy servicing.
• Simple keypad layout allows even novice users to
operate with minimal instruction.
• Unused controls are automatically locked out to
simplify setup. Examples: the AC wave balance
control has no effect in DC; the High Frequency and
gas and water valves do not operate in Stick mode;
TIG Pulser is locked out in the Stick mode.
• Recessed panels protect controls, output terminals
gas and water fittings.
• Large safety margins and protective circuits protect
rectifiers from transient voltages and high currents.
• Submersion dipping of assembled transformer,
choke, rectifier in special sealing/insulating material
gives added protection against moisture and
corrosive atmospheres.
• Line Voltage Compensated.
• Thermostatically Protected.
• Electronic Over Current Protection.
• Hinged Cover over Output Panel.
Limitations
Arc Gouging cannot be performed with the Square
Wave TIG 255.
The Square Wave TIG 255 is not recommended for
pipe thawing.
Welding Capability
The Square Wave TIG 255 is rated at 255 amps, 30
volts, at 40% duty cycle on a ten minute basis. It is
capable of higher duty cycles at lower output currents.
If the duty cycle(s) are exceeded, a thermal protector
will shut off the output until the machine cools to a
reasonable operating temperature.
OPERATION