Lincoln Electric ES 275I specifications ThERMAL Protection, POWER-uP SEQuENCE

b-4 OPERATION b-4

OVERLOAD PROTECTION

The machine is electrically protected from producing high output currents. Should the output current exceed 300A, an electronic protection circuit will reduce the current to less than 200A. The machine will continue to produce this low current until the pro- tection circuit is reset. Reset occurs when the output load is removed.

Note: When TIG welding with the Output Knob at or above 275 Amps the Arc may go out.

ThERMAL PROTECTION

Thermostats protect the machine from excessive operating temperatures. Excessive temperatures may be caused by a lack of cooling air or operating the machine beyond the duty cycle and output rating. If excessive operating temperature should occur, the thermostats will prevent output voltage or current.

Thermostats are self-resetting once the machine cools sufficiently.

FAN

The cooling fan on the ES 275i operates once 15 amps of welding current is drawn and for 7 minutes after the output current has stopped flowing.

The fan will also run anytime the machine has over heated.

POWER-uP SEQuENCE

At power up the thermal light (and Power light on codes 11164 and above) turns on and the fans run for approximately 3 seconds. This is the pre-charge time for the main capacitors. After this time the fans and thermal light turn off and the pre-charge relay closes to apply full line power to the capacitors. At this time the machine is ready to weld.

ES 275i