Lincoln Electric PIPEFAB Series Operator's Manual page 84

PIPEFAB™ WELDING SYSTEM
4-STEP TRIGGER
4-step trigger allows the operator to release the trigger once an arc has been established. To end the
weld, the trigger is pulled and then released again.
Two types of 4-Step Trigger are available. Use the set-up menu to select the desired type of opera�on.
With current interlock, if the arc goes out for more than 0.5 seconds while the trigger is released, the
welding process stops and goes to the idle state.
Without the current interlock, if the arc goes out while the trigger is released, output to the power
source remains on and the wire feeder will con�nue to feed wire.
Example 1: 4-Step Trigger: Trigger Interlock.
The 4-Step trigger can be configured as a trigger interlock. Trigger interlock adds to the welder's
comfort when making long welds by allowing the trigger to be released a�er an ini�al trigger pull.
Welding stops when the trigger is pulled a second �me and then released, or if the arc is interrupted.
For this sequence,
PREFLOW: Shielding gas begins to flow immediately when the gun trigger is pulled.
RUN-IN: A�er preflow �me expires, the power source regulates to the welding output and wire is
advanced towards the work piece at the Run-In WFS. If an arc is not established within
1.5 seconds, the wire feed speed will jump to the welding wire feed speed.
WELD: The power source output and the wire feed speed con�nue at the weld se�ngs. The
trigger is released and welding con�nues. Welding con�nues when the trigger is pulled
a second �me.
POSTFLOW: As soon as the trigger is released for the second �me, the power source output and the
wire feed speed are turned OFF. Shielding gas flows un�l the post flow �mer expires.
FIGURE B.27
B-33
OPERATION