Kemppi MASTERTIG AC/DC 2000 Operation Instructions Manual

Also see for MASTERTIG AC/DC 2000: Service manual

22 – Mastertig AC/DC 2000, 2500, 2500W, 3500W/0510 © COPYRIGHT KEMPPI OYPe4. COOLING UNIT(only Mastertig AC/DC 2500W, -3500W)no pressure overheated liquidgas- / water-cooled torch GAS / WATERtest run of the circulation of the liquid TESTFilling in the liquid and checking the liquid level is done by pulling open the hatch in the lowerpart of the machine so that you can see the filling hole for the liquid. The cooling units tankis filled with 20 – 40 % glycol / water mixture according to antifreeze requirements. Instead ofglycol / water mixture you can also use another liquid according to your experience.The circulation of the liquid is operation-controlled, which means that the liquid is circulatingonly during welding and for a while after the welding.5. INTERNAL PROTECTIONS OF THE MACHINE5.1. OVERHEATING PROTECTIONThe yellow signal light of the overheating protection comes on and the machine stopswhen the machine has overheated. The machine may overheat if the machine is loadedfor a long time with a current higher than 100 % of the duty cycle or when thecirculation of the cooling air is prevented.5.2. OVER-VOLTAGE PROTECTION OF THE MAINS SUPPLY VOLTAGEIf the over-voltages in the mains supply are so high that they can endanger themachine, the supply of the machine is immediately turned off. If the over-voltagesare short in duration, this may be seen as short breaks in the current. The signallight of the panel showing an over / under-voltage comes on during a long periodof over-voltage.5.3. THE WRONG VOLTAGE SELECTIONMastertig ACDC 2500, Mastertig ACDC 2500WIf a multi-voltage machine is connected to the wrong voltage, the machine will notstart and the signal light in the front panel comes on to indicate this. The machinewill not be damaged if it is connected to the wrong voltage for a short time. Unplugthe machine from the mains supply and select the correct voltage from the switchunder the front panel.5.4. PROTECTION OF A WATER-COOLED TORCHMastertig ACDC 2500W and -3500WIf the switch of the cooling unit is in the position for an gas-cooled torch and you start weldingwith a water-cooled torch and a current is over 60 A, the welding is broken.