Inverter is used for the spinning check of the inductive engine mainly for the purpose of decreasing power consumption. The inverter also undertakes the start and stop of the motor, avoiding in this way to stress the mechanical parts of the engine, as well as peak currents at start. There is also the potential of release function of trapped persons by the use of UPS. Simplex, duplex and triplex functions are supported. Diagnosis of the condition of the elements of the installation can take place via LED of the central board and PLC as well as a full configuration and damage diagnosis with the use of the special HMI module monitor which is adjusted to the PLC.