Kemppi A7 MIG Welder 350 Operating Manual

53A7 MIG Welder©Kemppi Oy 2017 1735OPERATING MANUAL4.10 Gas flow sensorThe welding system is equipped with a gas flow sensor that is located inside the wire feeder.The sensor is capable of sensing gas flow for any mixture of six base gases containingArgon (Ar), Carbon dioxide (CO₂), Nitrogen (N₂), Hydrogen (H₂), Oxygen (O₂) and Helium(He). The gas flow sensor provides both flow indication and flow rate outputs. The outputscan be monitored in the web user interface and in a robot pendant through the digitalrobot interface.These instructions and specifications apply to a gas flow sensor unit that is a standalonedevice inside the wire feeder.They do not apply to an integrated gas flow sensor that uses wire feeder hardware. Tocheck the type of the gas sensor in use, go to setup panel’s Main menu > System configmenu > Device information and navigate through the list. The standalone gas flow sensordevice appears in the list as “Gas sensor unit”. If that entry does not exist, the system usesthe integrated gas flow sensor.4.10.1 On/Off controlThe gas flow sensor can be turned on and off. By default, it is off. When turned on, flow rateand status are monitored in web user interface’s welding display.Setup panelGo to the Main menu > System config menu > Gas sensor menu, navigate to the Enabledparameter and turn the control knob on it to change the gas flow sensor on or off. Pressthe Save button to save the changes.Web user interfaceGo to the Welding settings > Welding system > Gas sensor settings and select the Gassensor on or off by clicking the corresponding button. A pop-up bar with Save and Resetchanges buttons will appear at the bottom. Press the Save button in the dialog to savethe settings.4.10.2 Gas flow sensing levelThe welding system can indicate flow rate below sensing level. This feature is enabledwhen the gas flow sensor has been turned on, the gas flow sensing level has been set togreater than zero, and gas is flowing by the means of manual control, or during welding.The indication is reported 3 seconds after the gas valve has been opened. The status ismonitored in the welding display of the web user interface, and is passed to the robot viathe digital robot interface as the GasFlowOk signal.Setup panelGo to the Main menu > System config menu > Gas sensor menu, navigate to the Levelparameter and turn the control knob on it to change the gas flow sensing level. Press theSave button to save the changes.Web user interfaceGo to the Welding settings > Welding system > Gas sensor settings and adjust the Gas flowsensing level parameter by using the slider, or by clicking on the value and typing a newvalue. A pop-up bar with Save and Reset changes buttons will appear at the bottom. Pressthe Save button in the dialog to save the settings.4.10.3 Gas mixture setupKnowing the exact mixture of the shielding gas is necessary for precise gas flowmeasurement. The gas flow sensor unit supports flow measurement for any mixture ofthe six base gases, including pure base gases. The mixtures are set up by specifying thepercentage of each gas in the mixture.Reconfigure the mixture every time when the type of the shielding gas is changed.The percentage of Argon is changed automatically when adjusting other gases, thetotal percentage being always 100 %. For example, if Carbon dioxide is increased from 0 to18 %, Argon is changed automatically from 100 to 82 %. This applies for Ar+18CO₂ gas. IfCarbon dioxide is increased to 100 %, Argon is decreased to 0 %. This applies for pure CO₂gas, etc.Setup panelGo to the Main menu > System config menu > Gas sensor menu > Gas mixture menu.Navigate through the gas parameters and adjust their percentage in the mixture byturning the control knob, according to the shielding gas in use. Press the Save button tosave the changes.Web user interfaceGo to the Welding settings > Welding system > Gas sensor settings and adjust the gasesby using sliders, or by clicking on the value and typing a new value. A pop-up bar withSave and Reset changes buttons will appear at the bottom. Press the Save button in thedialog to save the settings.