Lincoln Electric POWER FEED IM915 - Manual (Page 40)

4. COLD FEED / GAS PURGE SWITCH
Cold Feed and Gas Purge are combined
into a two position momentary toggle
switch.
To activate Cold Feeding, hold the switch
in the UP position. The wire drive will feed
electrode but neither the power source nor
the gas solenoid will be energized.
Keeping the electrode and gun electrically
“cold”. Adjust the speed of cold feeding by
rotating the WFS knob.
• This feature is useful for threading the electrode
through the gun.
• While the “cold feed” circuit is activated, adjust the
wire feed speed using the WFS knob.
Hold with toggle switch in the DOWN position to activate
Gas Purge and let the shielding gas flow. The gas sole-
noid valve will energize but neither the power source out-
put nor the drive motor will be turned on. The Gas Purge
switch is useful for setting the proper flow rate of shield-
ing gas. Flow meters should always be adjusted while
the shielding gas is flowing.
5. 2-STEP / 4-STEP TRIGGER SWITCH
The 2-Step / 4-Step switch has two set
positions. Place the switch in the UP posi-
tion for 2-step Trigger Operation and in
the down position for 4-step Trigger
Operation.
2 Step Trigger
2 Step trigger operation is the most com-
mon. When the gun trigger is pulled, the
welding system (power source and wire
feeder) cycles through the arc starting
sequence and into the main welding para-
meters. The welding system will continue
to weld as long as the gun trigger is activated. Once the
trigger is released, the welding system cycles through
the arc ending steps.
4-Step Trigger Operation
When the switch is in the 4-Step position the Power
Feed™ 10M Single Wire Feeder provides trigger inter-
lock capability (the operator can release the trigger and
the system will continue to weld) and it also allows the
operator to control the amount of time spent in the start
and crater weld modes.
See Sequence of Operation for more information on the
overall interaction trigger switch with the weld sequence.
The 2-Step / 4-Step trigger has no effect when welding
with SMAW or CAG procedures.
b-18 OPERATION b-18
POWER FEED™ 10M SINGLE WIRE FEEDER