Thermal Led; Digital Meters - Lincoln Electric FLEX FEED 74 HT Operator's Manual

FLEX FEED™ 74 HT
WIRE FEED SPEED KNOB
Turn the wire feed speed knob clockwise to increase the
wire feed speed.
Two ranges of wire feed are available: 50 -700
inches/minute and 50 – 500 inches/ minute (factory
setting).
REMOTE VOLTAGE CONTROL KNOB
The remote voltage control knob adjusts the output of the
power source. The Flex Feed 74 HT does not display
preset voltage.
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 rocker 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 comfort 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.
CAUTION
If the arc goes out while welding with trigger interlock
operation, the electrode 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.
------------------------------------------------------------------

THERMAL LED:

The thermal LED is located on the side of the
Flex Feed 74 HT near the wire drive.
The thermal LED lights when the motor
current is too high. Inspect the gun and
conduit, verifying that the wire slides through
easily.
COLD FEED
Pressing the Cold Feed rocker switch feeds
wire at the wire feed speed indicated by the
knob without turning on the power source
output.
GAS PURGE
Pressing the Gas Purge rocker switch turns
on the gas solenoid for as long as the switch
is held.
The power source output remains OFF during
Gas Purge.

DIGITAL METERS

(Advanced User Interface Only)
The digital meter kit displays the amperage and voltage
while welding. There must be at least 10 amps and 10
volts present for the meters to show welding values.
Once welding stops, the displays continue to show the
last values for 5 seconds. The displays do not show
preset values. If a gouging kit is installed, the displays
only show the voltage while gouging and not amperage.
The amperage range is 5 to 700 amps.
TIMER KIT
(Advanced User Interface Only)
The timer kit provides adjustment for preflow, burnback
and postflow.
B-5
OPERATION