Kemppi Feed 420R - Manual (Page 11)

Kempomig Feed 420R, 120R / 0429 – 11 ©
COPYRIGHT KEMPPI OY
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– Release locking nails of wire reel hub by turning locking knob a quarter of a round.
– Mount the reel at its place. Note rotating direction of reel!
– Lock the reel with locking knob, locking nails of hub remain in outside position and will
lock the reel.
Check the fi ller wire reel that there are no parts sticking out which could e.g. chafe
against chassis or door of wire feeder unit. Dragging parts might expose chassis of
wire feeder unit under voltage.
2.8. AUTOMATIC WIRE FEED TO GUN (FEED 120R)
Automatic wire feed makes change of wire reel more rapid. In reel change the pressure of feed
rolls need not be released and fi ller wire goes automatically to correct wire line.
– Make sure that groove of feed roll matches the diameter of welding wire used. Feed roll
groove is selected by moving the groove selecting washer (28).
– Release the wire end from reel and cut off the bent length. Be careful that the wire does not
spill from the reel to sides!
– Straighten the wire at a length of about 20 cm and see that its end has no sharp edges (fi le off
if necessary). A sharp edge may damage the wire guide tube and contact tip of the welding
gun.
– Draw a bit of loose wire from wire reel. Feed wire through back liner to feed rolls. Do not
release pressure of feed rolls!
– Press the gun switch and feed a bit wire until wire goes through feed rolls to gun. See that
wire is in grooves of both feed roll pairs!
– Press still the gun switch until wire has come through contact tip.
Automatic feed may sometimes fail with thin wires (Fe, Ss: 0,6...0,8 mm, Al, Fc: 0,8...1,0 mm).
In case open feed rolls and feed wire manually.
2.9. ADJUSTMENT OF PRESSURE
Adjust the pressure of feed rolls with the control screw (20) so that the wire is fed into the wire
guide tube evenly and allows a little braking when coming out from the contact tip without
slipping at the feed rolls.
Excessive pressure causes fl attening of the fi ller wire and damage to the coating.
It also causes undue wear of the feed rolls as well as friction.
2.10. ADJUSTMENT OF TIGHTNESS OF WIRE REEL BRAKE
(ACCESSORY)