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LF-72/74
OPERATION
BB-6 BB-6
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6.
2 STEP - TRIGGER INTERLOCK
SWITCH
The 2 Step - Trigger Interlock switch
changes the function of the gun trigger. 2
Step trigger operation turns welding on
and off in direct response to the trigger.
Trigger Interlock operation allows welding
to continue when the trigger is released
for comfort on long welds.
Place the toggle switch in the DOWN position for 2
Step operation or in the UP position for Trigger
Interlock operation.
2 Step Trigger
2 Step trigger operation is the most common. When
the gun trigger is pulled, the welding power source
energizes the electrode output and the wire feeder
feeds wire for welding. The power source and wire
feeder continue welding until the trigger is released.
Trigger Interlock
Trigger Interlock operation provides for operator com-
fort when making long welds. When the gun trigger is
first pulled, the welding power source energizes the
output and the wire feeder feeds wire for welding. The
gun trigger is then released while the weld is made. To
stop welding, the gun trigger is pulled again, and
when it is released the welding power source output
turns off and the wire feeder stops feeding wire.
• If the arc goes out while welding with
trigger interlock operation, the elec-
trode output from the welding power
source remains energized and the
wire feeder will continue to feed wire
until the gun trigger is again pulled
and then released.
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7. GUN RECEIVER BUSHING (K1500-2)
(K1500-2 bushing is standard on all LF-74's)
This Gun Receiver Bushing is used with Lincoln gun
connectors, also with Magnum 200/300/400 guns and
compatible with Tweco® #2-#4).
8.
TRIGGER CONNECTOR 5-PIN AMPHENOL
This is used for connecting the MIG gun trigger. See
Installation Section for detail.
CAUTION