Kemppi A7 MIG Welder 350 Operating Manual

54A7 MIG Welder©Kemppi Oy 2017 1735OPERATING MANUAL5. TROUBLESHOOTING5.1 Typical problemsThe problems listed and the possible causesare not definitive, but serve to suggest some standardand typical situations that may present during normalenvironmental use when using the MIG/MAG process withthe A7 MIG Welder.Problem Check the followingMachine won’t work • Check mains plug is connected correctly• Check mains power distribution is switched on• Check the mains fuse and/or circuit breaker• Check power source 0/1 switch is ON (1)• Check interconnection cable set and connectors between the power sourceand wire feed unit are correctly fastened. See the manual schematic• Check earth return cable is connected• Check control panels are switched on.Dirty, poor quality weld • Check shielding gas supply• Check and set gas flow rate• Check gas type for application• Check gun/electrode polarity• Check correct welding program selected• Check correct channel number selected on wire feeder control panel• Check power supply – Phase down?Variable weldingperformance• Check wire feed mechanism is correctly adjusted• Check correct drive rolls are fitted• Check wire spool overrun tension is correctly adjusted• Check gun liner is not blocked, replace if necessary• Check correct gun liner is fitted for the filler wire size and type• Check contact tip for size, type and wear• Check gun is not over heating in application• Check cable connections and earth return clamp• Check welding parameter settings.Filler wire won’t feed • Check that pressure arms are closed and adjusted in wire feed mechanism• Check welding gun switch function• Check Euro gun collar is correctly fastened• Check gun liner is not blocked• Check contact tip, size, type, wear• Check and try alternative gun.