5.6 Close and hold down each pressure roller housing then hinge the
pressure knob upwards and onto the housings until it snaps into
position. (fig.19) Set an intermediate pressure between marks 2 and 3.
Turning the knob clockwise increases the pressure. Turning the
knob anti-clockwise decreases the pressure. (See fig.20 above).
5.7
FEEDING WIRE ThROUGh TO ThE TORCh.
5.7.1 Before feeding the wire through to the torch the gas cup and contact tip
should be removed as shown in fig.21.
5.7.2
Model POWERMIG 2750
Remove gas cup (a) and contact tip (b) from
end of torch as follows:
a) Take torch in left hand with the torch tip facing to the right.
b) Grasp gas cup firmly in your right hand.( Cup is a friction fit.)
c) Turn gas cup
clockwise only
and pull cup out to the right.
wARNING!
do not turn gas cup anti-clockwise, as this will damage
the internal spring.
d) Unscrew the copper contact tip using a 6mm spanner on the flats of
the contact tip. It has a conventional right hand thread.
5.7.3
Models POWERMIG 3500
& 4500.
The gas cup is a friction fit onto the
torch and can be pulled off with a twisting action in either direction.
Unscrew the copper contact tip using a 6mm spanner on the flats of
the contact tip. It has a conventional right hand thread.
5.7.4 To feed the wire through to the torch it will be necessary to power up
the welder.
5.7.5
Model 2750.
Check welder is switched off “0”, and that the earth clamp is isolated
and away from the torch tip. Connect the welder to the mains power
supply and set the voltage switch to “1”.
fig.20
fig.22
5.7.6
Models 3500 & 4500
have a portable feed unit inside the welder.
Ensure that this is conected to the main unit before proceeding.
Connect the positive power supply lead and the control lead from the
feeder to the sockets in the internal compartment as shown in fig.22.
5.7.7
Connect the welder to the mains power supply and set the voltage
switch to “1”.
5.7.8 Set the wire speed knob to position 5 or 6, (the higher the number the
faster the speed). Keep the torch cable as straight as possible and
press the torch switch to feed wire through the torch.
5.7.9 When wire has fed through, switch welder off, unplug from mains.
5.7.10 Replace contact tip and gas cup. Cut wire so that it is protruding 1/4”
from the cup.
wARNING!
During these operations the wire is live and subject to
mechanical stress; therefore, if adequate precautions are not taken the
wire could cause hazardous electric shock, injury and striking of electric
arcs. Do not direct the torch tip towards parts of the body and keep the
torch away from the gas bottle
5.8 SETTING WIRE TENSION.
IMPORTANT: You must set the correct tension, too little or too much
tension will cause problematic wire feed and result in poor welding.
5.8.1. Tension between rollers is checked by slowing down the wire between
your fingers. If top feed roller skids the tension is correct. Use as low a
tension as possible, too high a tension will deform wire and result in a
blown fuse on the printed circuit board. Adjust tension by turning
pressure knob as shown in fig.20.
5.9
CLUTCh ADJUSTMENT
It is essential that the clutch is adjusted correctly. Once the wire is fed
through the torch, switch on the machine and set the wire speed and
voltage switch to maximum. Depress the torch switch and release
quickly. If spool overruns it indicates that the clutch is too loose. Tighten
the clutch (located in the centre of the wire spool holder (fig 11), and
test the machine as above until the wire stops over running.
WARNING! DO NOT over tighten the clutch as this will cause
wire feed problems.
fig.21
fig.22
Original Language Version
POWERMIG2750.V2, POWERMIG3500.V2, POWERMIG4500.V2 Issue: 3 - 09/04/10
