Lincoln Electric POWER FEED SVM185-A - Manual (Page 52)

OPERATION B-34 B-34
POWER FEED® 25M
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EXAMPLE 1 - 2 STEP TRIGGER: Simple operation
The simplest trigger operation occurs with a 2 Step
trigger and the Start, Crater and Burnback functions all
set to OFF. (See Figure B.19)
For this sequence,
PREFLOW:
Shielding gas begins to flow immediately when the gun
trigger is pulled.
STRIKE:
After preflow time expires, the power source regulates
to the welding output and wire is advanced towards the
work piece at the strike 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-
tinue at the weld settings for as long as the trigger is
pulled.
POSTFLOW: As soon as the trigger is released, the
power source output and the wire feed speed are
turned OFF. Shielding gas continues until the post
flow timer expires.
Shielding
Gas
Idle Preflow Strike Weld Postflow Idle
Power
Source
Output
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 R
el
ea
se
d
2 Step Trigger
Start = OFF
Crater = OFF
Burnback = OFF
1.5 sec max.
FIGURE B.19