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7.OuTPuT TERMINALS - These quick discon- nect terminals are compatible with TWECO®* con- nectors. The terminal provide connection points for the electrode and work cables. Refer to Output Connection in the Installation chapter for proper cable sizes. For positive polarity welding connect the electrode cable to the positive terminal and the work cable to the negative terminal. To weld nega- tive polarity reverse the electrode and work cables.
* TWECO® is registered trademark of Thermo Dyne Corporation.
8. ThERMAL ShuTDOWN INDICATOR -
This light will illuminate if an internal thermostat has been activated. Machine output will return after the internal components have returned to a normal operating temperature. See Thermal Protection later in this Operation chapter.
9. 3-PIN REMOTE RECEPTACLE
10.POWER LIGhT - This Light will illuminate when the power switch is in the “ON” Position.
CONSTANT CuRRENT PROCESSES
STICK WELDING*
The Invertec may be utilized as a manual DC arc welder with the electrode cable, work cable, and elec- trode holder being the only equipment required.
AIR CARbON ARC CuTTING*
Air carbon arc cutting may be performed with the Invertec within its output rating using 3/16”(4.8mm) diameter carbon rods. Output cables, an air carbon arc electrode cable assembly, and a source of com- pressed air are required.
TIG WELDING*
The ES 275i is capable of touch start TIG welding. An electrode cable, work cable, TIG torch, and gas sup- ply with regulator are required.
Touch starting is done as follows:
1.Place the shield cup edge on the work piece.
2.Rock the tungsten down to touch.
3.Gently rock back the tungsten from the work- piece.
Note: The short circuit current is limited to 20 amps to aid in touch starting. Panel output control becomes the current limit setting when in remote control.
*Note: Operating this machine with the output control set to maximum may cause the machine to phase back and the arc to go out. This occurs because the welding current exceeded 300 amps and the machine’s protection circuitry activated. Turn the output control down to cor- rect this condition.
PARALLEL OPERATION
The Invertec’s are operable in parallel. For best results, the currents of each machine should be rea- sonably well shared. As an example, with two machines set up in parallel for a 300 amp procedure, each machine should be set to deliver approximately 150 amps, not 200 amps from one and 100 amps from the other. This will minimize nuisance feedback conditions. In general, more than two machines in par- allel will not be effective due to the voltage require- ments of procedures in that power range.
To set machine outputs, start with output control pots and arc force pots in identical positions. Adjust out- puts and arc forces to maintain current sharing while establishing the proper output current.
ES 275i