Kemppi Promig 300 Operation Instructions Manual

12 – PROMIG 200, PROMIG 300 / 0537 © KEMPPI OY41- Release the wire end from reel and cut off the bent length.Be careful that the wire does not unwind and spill from the reel!Straighten about 20 cm of the wire and see that the end of it has no sharp edges(file off if necessary). A sharp edge may damage the wire guide tube and contacttip of the welding gun.- Draw a bit of loose wire from reel. Feed wire through back liner to feed rolls.Don’t release pressure of feed rolls!- Press the wire drive switch S11 or the gun switch and feed a bit wire until wire goes throughfeed rolls to gun.See that wire is in grooves of both feed roll pairs!- Press still the wire drive or the gun switch until wire has come through contact tip.Automatic feed may sometimes fail with thin wires (Fe, Fc, Ss: 0,6 and 0,8 mm (0,030”)(Al: 0,8 and 1,0 mm (0,030” and 0,035”). Then it might be possible that you must open feedrolls and feed wire manually through feed rolls.2.2.5. Adjustment of pressureAdjust the pressure of feed rolls with the control screw (20) so that the wire is fed into the wireguide tube evently and allows a little braking when coming out from the contact tip withoutslipping at the feed rolls.Excessive pressure causes flatening of the filler wire and damage to the coating.It also causes undue wear of the feed rolls as well as friction.2.2.6. Adjustment of tightness of reel brakeBrake force is adjusted through hole in locking device of reel hub by screwing the control screw(41) with screwdriver.Adjust the brake force to a point where the wire reel will not continue to overrun once the drivemotor has stopped. If this is too loose the wire will spill from the reel. If this is too tight thebrake puts excess load on the wire drive motor. The brake force may be different for high wirefeed speeds and the varied weights of the wire reels and filler materials.2.2.7. Burn back timeElectronics of the unit controls stopping of welding automatically so that the wire end doesn’tmelt to fastened to the contact tip or the work piece. Automatics work regardless of the wire feedspeed. End automatics eliminate also forming so-called ”ball” at wire tip, disturbing next start.