Changing the run in mode section, Warning, Operation – Lincoln Electric WIRE-MATIC 255 SVM 119-A Manuel d'utilisation
Page 26: Operating steps
B-7
OPERATION
B-7
SETTING IDLE ROLL PRESSURE
The idle roll pressure thumb screw is set at the factory
backed out 2-1/2 turns from full pressure. This is an
approximate setting. The optimum idle roll pressure
varies with type of wire, wire diameter, surface condi-
tions, lubrication, and hardness. As a general rule,
hard wires may require greater pressure, and soft, or
aluminum wire, may require less pressure than the fac-
tory setting. The optimum idle roll setting can be deter-
mined as follows:
1.
Push the end of gun against a solid object that is
electrically isolated from the welder output.
2.
Press the gun trigger for several seconds.
a.
If the wire "birdnests", jams, or breaks at the
drive roll, the idle roll pressure is too great.
Back the thumb screw out 1/2 turn, run new
wire through gun, and repeat steps 1 and 2.
b.
If the drive roll slips, loosen the thumb screw
on the conductor block and pull the gun cable
forward about 6" (15 cm). There should be a
slight waviness in the exposed wire. If there is
no waviness, the pressure is too low. Tighten
the thumb screw 1/4 turn, reinstall the gun
cable, and repeat steps 1 and 2.
OPERATING STEPS
Before operating the machine, be sure you have all
the materials needed to perform the work. Be sure
you are familiar with and have taken all possible
safety precautions before starting the work. It is
important that you follow these operating steps
each time you use the machine.
___________________________________
STARTING THE WELDER
1.
Turn the POWER switch to ON. This illuminates
the red LED pilot light.
2.
Select the correct voltage and wire speed for the
welding process required.
3.
Operate the gun trigger for welder output and to
energize the wire feeder motor.
NOTE: When the POWER SWITCH is ON, the fan
motor is thermostatically controlled to provide cooling
for the transformer and other components only when
the machine needs cooling. When the machine does
not require fan cooling the fan does not run, such as
when first turned on, when welding at low current, or at
low duty cycle procedures.
CHANGING RUN-IN MODE
FAST OR SLOW RUN-IN MODE
SELECTION
The WIRE-MATIC 255 is factory set for fast run-in
mode where the wire feed will accelerate directly to the
preset wire feed speed when the gun trigger is closed.
Slow run-in mode may also be selected, where it will
initially feed wire at 50 IPM until output current is
sensed or for 2.0 seconds, whichever occurs first.
After which it will accelerate to the preset wire feed
speed.
INSTRUCTIONS TO ENTER SLOW RUN-IN
MODE
1.
Turn power OFF on front panel of Wire-Matic 255.
2.
Turn the wire feed speed dial to minimum, fully
counterclockwise.
3.
With the gun trigger closed, turn the power ON at
the front panel of the Wire-Matic 255.
4.
The gas solenoid will actuate two times to signal
that the unit has entered the slow run-in mode (the
gun trigger need only be closed until the first gas
solenoid actuation is heard).
INSTRUCTIONS TO ENTER FAST RUN-IN
MODE
1.
Turn power OFF on front panel of Wire-Matic 255.
2.
Turn the wire feed speed dial to maximum, fully
clockwise.
3.
With the gun trigger closed, turn the power ON at
the front panel of the Wire-Matic 255.
4.
The gas solenoid will actuate four times to signal
that the unit has entered the fast run-in mode (the
gun trigger need only be closed until the first gas
solenoid actuation is heard).
WIRE-MATIC 255
WARNING