The electrical cabinet doors shall never be opened when the machine tool is connected to the power supply, especially when the headstock spindles rotate.
When switched off by one of the main switch releases (the main switch handle is in an oblique position) the machine tool can be re-switched on after the main switch handle is turned into the "off" direction (left) and then it is turned, as usually, into the "on" direction (right). For the servicing purposes, if it is necessary the machine tool operates when the electrical cabinet doors are opened please follow the procedures described in Chapter 6 in Electrical Part of this Operation and Maintenance Manual