Lincoln Electric SVM185-A Cold FEED/GAS Purge Switch, Light Switch, Step Trigger Operation

COLD FEED

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B-33 OPERATION B-33

NOTE: All switches described on this page will func- tion only when power source is ON.

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COLD FEED/GAS PURGE SWITCH

Cold Feed and Gas Purge are combined into a single spring centered toggle switch.

To activate Cold Feeding, hold the GAS PURGE switch in the UP position. The wire drive

will feed electrode but neither the power source nor the gas solenoid will be energized. Adjust the speed of cold feeding by rotating the WFS knob. Cold feeding, or "cold inching" the electrode is useful for threading the electrode through the gun.

Hold with toggle switch in the DOWN position to acti- vate Gas Purge and let the shielding gas flow. The gas solenoid valve will energize but neither the power source output nor the drive motor will be turned on. The Gas Purge switch is useful for setting the proper flow rate of shielding gas. Flow meters should always be adjusted while the shielding gas is flowing.

LIGHT SWITCH

ON

Turn the internal light switch ON to illuminate the inside of the POWER

FEED® 25M. LIGHT

OFF

2 STEP - 4 STEP - TRIGGER OPERATION

The 2 Step - 4 Step switch changes the	4 STEP
function of the gun trigger. 2 Step trig-
ger operation switches the welding out-
put ON-OFF in direct response to the
trigger. 4 Step trigger operation pro-
vides 'trigger interlock' capability and
gives the ability to control the amount of
time spent in the arc start and arc crater
steps.	2
Place the toggle switch in the UP posi-		-STEP
tion for 4 Step operation and in the
DOWN position for 2 Step operation.

The 2 Step - 4 Step trigger has no effect when weld- ing with SMAW or CAG procedures.

2 Step Trigger

2 Step trigger operation is the most common. 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 parameters. 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

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HEATER SWITCH

Turn the heater switch ON to warm the inside of the POWER FEED®

ON

4 Step trigger operation gives the welder additional control in the welding sequence. 4 step trigger allows the welder to choose the arc start, weld and arc end time. It may also be set-up to work as a trigger inter-

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25M. The heater is useful for reduc-

ing condensation build-up on the HEATER
spool of wire.	OFF

lock.

POWER FEED® 25M