Forney MAXFire 140, Operating Manual

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1. Main ON/OFF switch (green):
19.1
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CAT# 319
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Lights up when you switch ON the welder on.
2. Welding voltage adjustment knob
3. Auxiliary circuit protection fuse 1 Amp fuse: Do not
replace it with differentcurrent fuses.
4. Wire feed adjustment knob: To increase the wire
speed, turn the potentiometer clockwise; to decrease
the wire speed, turn it counter-clockwise. The same
procedure decreases the values on the welding
parameters. Turn knob slowly.
5. Spot welding time regulation knob:
MIN. 0.4 seconds - MAX. 10 seconds
6. Welding “MODE” selector key: Use these keys to
select the following types of welding:
- 2T: 2 time welding = manual
- 4T: 4 time welding = automatic
- Automatic spot welding with timer
7. B.B.T. ( burn back time): When releasing the torch
trigger the machine will work for a very short time.
This function avoids burning of wire and consequent
wire sticking to the contact tip. By turning the B.B.T.
potentiometer clockwise/counterclockwise with a
screw driver, the wire which is exiting from the torch
at the end of the welding will become shorter or longer.
8. SLOPE: Turning trimmer with a screwdriver to adjust the time necessary for the wire feed
motor to reach the speed that you set through the potentiometer. MIN. slope 0.25 seconds -
MAX. slope 1.6 seconds
9. Overheating indicator (yellow): This LED blinks when unit is overheating. It will light up when
thermostatic protection shut down the machine and will cease blinking only after the machine
has cooled sufficiently to continue welding.
10. Spool gun torch green LED: lights up when the spool gun torch is connected.
11. Display: Allows operator to view the real time weld current. After welding the display will
show the final welding current value for a maximum of 3 seconds.
12. Torch connection
13. 7 poles connection for Spool Gun (optional)
WARNING: If the duty cycle of the welder is exceeded, a thermostat will automatically cut
the power to prevent the machine from overheating. If this should happen do not unplug the
machine while it cools down. The thermostat will automatically reset itself and you can continue
welding. The thermostat is a protective safety device and no harm will normally be done to the
welder unless it is frequently over-loaded, in which case it may eventually become damaged.
Welder Controls
Thermal Overload Protection