Clarke 250TE Dokumentacja Pobierz pdf (Strona 19)

5. Unscrew the pressure roller

bracket securing knob (A, Fig

7), whilst holding down the

pressure roller bracket (B),

against spring pressure, so that

the screw rod hinges out of its

slot. This releases the pressure

roller bracket which, when

released, will pivot upwards

under spring pressure.

IMPORTANT!

Before fitting ANY wire, ensure the correct groove on the roller is in place.

(see page 20)

Fig.9

6. Pull out the end of the wire

from the rim of the spool,

taking care NOT to release it.

The spool is wound firmly and

should remain this way.

Ensuring the wire is straight and

not kinked in any way, clip off

the end with a sharp pair of

snips ensuring there are no

burrs or sharp edges.

Proceed to feed it through the

guide tube (C, Fig.8), over the

groove on the roller (D), and

into the wire liner, by about 10

- 15 cm.

7. Reposition the pressure roller bracket and securing knob (A) and tighten

slightly.

Tightening the knob (A) too tightly will crush the wire and damage the

wire feed motor, too loose will not allow the wire to be pulled by the roller.

8. (Ref. Fig 9)

Remove the torch shroud by

twisting it anti clockwise and

pulling it off, then unscrew the

contact tip.

Should any wire protrude from the

tip....pull it out completely and

discard.

Fig.7

Fig.8

(i) WELDING CURRENT CONTROL

(ii)WIRE FEED SPEED CONTROL.

The WIRE FEED Rotary Control Knob, with graduations from 0 to 10, is used to fine

tune the wire speed feed to the nozzle.

The knob should be set to position 6 to begin with for welding steel, and 8 for welding

aluminium, then adjusted as required.

Note: This control is for fine tuning the wire speed. The speed of wire delivery will

increase automatically as the current is increased and vice versa. Therefore, once

the ideal speed is achieved by fine tuning, it should not be necessary to adjust

this control when the welding current is changed.

It is always better to start with too high a speed, and back off slightly, to avoid the

possibility of the wire welding itself to the tip.

Select the welding current according to the type of metal and thickness to be

welded. The control has 7 positions as indicated in the chart below.

Experience will determine the optimum setting for the job in hand, but the chart

gives general settings from which to work.

Steel Wire

Diameter

(mm)

Wire Speed

Adjustment

Switch

Positions

10.6LOW

20.6LOW

3 0.6 - 0.8 MEDIUM

4 0.6 - 0.8 MEDIUM

5 0.8 MEDIUM _ HIGH

6 0.8 HIGH

7 1.0 HIGH

PLEASE NOTE: If the current and hence the wire speed is increased, the volume of

gas at the nozzle must also be increased. Turn the regulator knob accordingly.

E. Trim the Welding Wire

Trim the welding wire so that it protrudes no more than 5mm from the end of the

shroud.

D. Timer Control

This is explained in more detail on page 24. For all normal welding operations, set

this control to zero

1 2 ... 14 15 16 17 18 19 20

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