DRIVE SYSTEM HAVING AN ARRANGEMENT FOR DETECTING GRID FAULTS AND METHOD FOR DETECTING GRID FAULTS

The invention relates to a drive system having an arrangement for detecting grid faults and to a method for detecting grid faults, wherein the drive system (8) has a rectifier (2) of converter, supplied from an alternating voltage supply grid, in particular via a line filter (3), in particular wherein the direct voltage connection of an inverter (1) of the converter is supplied from the direct voltage connection of the rectifier, wherein the inverter supplies an electric motor (M), wherein a comparator (4) is assigned to each phase voltage of the alternating voltage supply grid, wherein the output signals of the comparators are supplied to a logical linking means (5), the output signal of which is supplied, in particular galvanically separated, to an evaluation unit (7), in particular wherein the respective comparator (4) produces an output signal that has pulses synchronous to the zero passages of the respective phase voltage of the alternating voltage supply grid and is supplied to the logical linking means (5), wherein the output signal of the logical linking means is supplied to the reset input of a counter of the evaluation unit that counts proportionally to time, and wherein the counter status present upon each resetting of the counter is evaluated in a memory, in particular a ring memory, of the evaluation unit, which actuates a display for displaying a grid fault.