Lincoln Electric PIPEFAB Series Operator's Manual page 86

PIPEFAB™ WELDING SYSTEM OPERATION
4-STEP TRIGGER: SPECIAL CONSIDERATIONS
The response to the trigger with 4-step trigger ac�ve is dependent upon when the trigger is
pulled/released and the se�ngs for START and CRATER.
Example 1:
Pull the trigger to start feed of wire. When arc is established the sequencer will remain in START un�l
the trigger is released. When the trigger is released, UPSLOPE begins. If trigger is pulled again during
UPSLOPE and CRATER/DOWNSLOPE is ac�ve, the feeder will begin the DOWNSLOPE, sloping down over
the CRATER �me, regardless of when the trigger pull occurred.
If the CRATER/DOWNSLOPE state is disabled and the trigger is pulled during UPSLOPE, the sequencer
will remain in the UPSLOPE state and con�nue with the weld. If the fourth step (trigger release) occurs
during UPSLOPE, the sequencer will jump to the BURNBACK to end the weld.
Example 2:
Pull the trigger to start feed of wire. When arc is established the sequencer will remain in START un�l
the trigger is released. When the trigger is released, UPSLOPE begins and con�nues into WELD when
the START �mer is complete. When the trigger is pulled again (step 3) and CRATER/DOWNSLOPE is
ac�ve, DOWNSLOPE begins and con�nues un�l the CRATER �mer expires, at which �me CRATER will be
entered un�l the trigger is released.
While in DOWNSLOPE, if the trigger is released before the �mer expires, the trigger will be ignored and
the DOWNSLOPE state will con�nue un�l the �mer expires, at which point CRATER state will be enabled,
check for trigger, and jump to BURNBACK since the trigger has been released.
While in the DOWNSLOPE state and the trigger is released and then pulled again, it will be ignored.
During 4-Step opera�on in DOWNSLOPE, the trigger will always be ignored.
B-35