Abstract: An apparatus for controlling an operation of an elevator includes a power supply unit for detecting whether the main power supply was supplied including a charger and for outputting a predetermined control signal, an operation control unit for receiving the control signal from the direct current power supply unit and a demand control signal inputted by a user and for outputting a speed control signal and a load compensation signal so as to control the elevator system, a power consumption detector for computing a power consumption of the alternating current motor, a speed limiter for limiting a speed of the motor upon receipt of the alternating current motor speed signal from the speed detector and the power consumption of the motor computed by the power consumption detector, and a speed control unit for controlling a rotational speed of the alternating current motor upon receipt of the load compensation signal and the control signal from the speed limiter.

Abstract: A current/voltage control apparatus for an elevator system which is capable of preventing an over current from being applied to an inverter by stopping a driving operation of the inverter when a difference (hereinafter called "current deviation") between a current instruction and actual current value exceed a predetermined value during a predetermined time.