Fail-safe power control apparatus

A failure-safe power control apparatus for supplying power between an energy source and the motor of a transport system, said power control apparatus comprising a power supply circuit which comprises at least one electronic power converter containing controllable change-over switches, said power control apparatus further comprising at least two controllers adapted to communicate with each other, of which controllers at least a first one comprises converter control and at least a second one comprises determination of a motion reference for a transporting equipment, and said power control apparatus comprising the control of at least one braking device, wherein at least the first and the second controllers comprise inputs for motion signals of the transporting equipment, monitoring of the motion of the transporting equipment, and outputs for control signals for at least one braking device.