Lincoln Electric Power Feed 25M Operator's Manual page 52

POWER FEED™ 25M
OPERATION
2- STEP 4- STEP- TRIGGER OPERATION
The 2-Step - 4-Step switch changes the function of the gun
trigger. 2-Step trigger operation switches the welding output ON-
OFF in direct response to the trigger. 4-Step trigger operation
provides 'trigger interlock' capability and gives the ability to con-
trol the amount of time spent in the arc start and arc crater
steps.
Press the push button on the case front to toggle between 2-
Step and 4-Step operation.
The 2-Step, 4-Step trigger has no effect when welding with
SMAW or CAG procedures.
2-Step Trigger
2-Step trigger operation is the most common. When the gun trig-
ger is pulled, the welding system (power source and wire feeder)
cycles through the arc starting sequence and into the main weld-
ing parameters. The welding system will continue to weld as
long as the gun trigger is activated. Once the trigger is released,
the welding system cycles through the arc ending steps
4-Step Trigger
4-Step trigger operation gives the welder additional control in the
welding sequence. 4-Step trigger allows the welder to choose
the arc start, weld and arc end time. It may also be set-up to
work as a trigger interlock.
B-36