Lincoln Electric POWER FEED IM892-C - Manual (Page 62)

B-46 OPERATION B-46
POWER FEED™ 25M
Shielding
Gas
Idle Preflow Strike Weld Burnback Postflow Idle
WFS
On
Off
Run-in
Off
Weld
Off
Weld
Ar
c
Es
ta
bl
ish
ed
Tr
ig
ge
r P
ul
le
d
Tr
ig
ge
r
Re
le
as
ed
4 Step Trigger
Start = OFF
Crater = OFF
Burnback = OFF
1.5 sec max.
Start
Crater
Power
Source
Output
Crater
Tr
ig
ge
r P
ul
le
d
Tr
ig
ge
r R
el
ea
se
d
FIGURE B.22
EXAMPLE 4 – 4 STEP TRIGGER: Trigger Interlock
The 4 step trigger can be configured as a trigger inter-
lock. Trigger interlock adds to the welder’s comfort
when making long welds by allowing the trigger to be
released after an initial trigger pull. Welding stops
when the trigger is pulled a second time and then
released, or if the arc is interrupted. (See Figure B.22)
For this sequence,
PREFLOW:
Shielding gas begins to flow immediately when the
gun trigger is pulled.
RUN-IN:
After preflow time 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
continue at the weld settings. Welding continues when
the trigger is pulled a second time.
POSTFLOW:
As soon as the trigger is released for the second time,
the power source output and the wire feed speed are
turned OFF. Shielding gas flows until the post flow
timer expires.