A decanter centrifuge is disclosed for separating a liquid feed mixture into constituent parts. The output of the current monitoring circuit may be employed to abort starting if abnormalities are sensed. The server sends a JavaScript program corresponding to the template web page, which makes reference to the template web page and the changed data, along with sending the actual changed data itself. In accordance with pivoting the shift spindle, a sub arm is pivoted and preload is applied on a master arm by a preload spring. The thermal element is configured to activate and break electrical contact with said second terminal upon a predetermined current condition. For this reason, the inductance becomes small and also a power source loss and a spike voltage are reduced.