Lincoln Electric POWER FEED 25M NNS Operator's Manual page 27

POWER FEED™ 25M NNS OPERATION
2- STEP 4- STEP- TRIGGER OPERATION
2-Step Trigger
The 2-Step - 4-Step switch changes the function of the
gun trigger. 2-Step trigger operation switches the weld-
ing output ON-OFF in direct response to the trigger. 4-
Step trigger operation provides 'trigger interlock' capa-
bility and gives the ability to control 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 trigger is pulled, the welding system (power source
and wire feeder) cycles through the arc starting
sequence and into the main welding 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 inter-
lock.
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