Lincoln Electric POWER FEED 25M Service Manual page 52

B-34
Idle
O n
Shielding
Gas
O ff
Weld
Power
Source
Output
O ff
Weld
WFS
Run- in
O ff
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OPERATION
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.
FIGURE B.19
2 Step Tri gger
Start = OFF
Crater = OFF
Burnback = OFF
Preflow Strike
1.5 sec max.
POWER FEED® 25M
Weld
B-34
Pos tflow Idle