Abstract: A procedure for exactly stopping an elevator at a desired point, which elevator is moving along a controlled path and is provided with stopping brake for controlling the time of start of the braking. Determination of the time for starting the braking is with the aid of direct and indirect measurement of the velocity of the elevator and with the aid of a logic unit (LU). This logic unit (LU) contains at least one central processing unit (CPU), a program memory (PM) and a data memory (DM), so that the central processing unit implements operations in accordance with commands stored in the program memory and reads information from the data memory and stores information in the data memory.

Abstract: Procedure for exact aligning with the storey floor level of a lift cage driven by an alternating current motor, wherein the current in one or several phases of the lift's drive motor (2) is choked with a controllable choke element (22). The control is governed by a control unit (23) which receives information of the lift cage's (8) true velocity, constituting a feedback-connected control loop which imparts to the lift cage in fine adjustment running a low velocity from which the lift cage is able to stop at the storey floor level within a required tolerance range.

Abstract: A control circuit for use with an electronic guard strip for preventing collision of the strip with a moving object. A control such as a relay, is connected to at least one antenna, which antenna forms a capacitor together with a base in its ambiance. A voltage generator conducts an alternating voltage to the antenna. The control and the antenna are connected in circuit relation to an amplifier. A change of voltage arising from any capacitive protuberation in the antenna is conducted to the control. The voltage from the amplifier is conducted through a rectifier to another amplifier that is connected so as to have its direct current gain as +1, but which amplifies any change of voltage occurring in the d.c. voltage input to a multiple and which further acts upon the control through a comparator.

Abstract: Lift battery control system comprising a plurality of lift cages 1 serving a plurality of storey levels 108, where there are means 10,11 for making calls from these levels, and means for determining the location of the lift cage, and for said lift cages control means 1,2,3 . . . containing one or several microcomputers 14 with, among other things, one or several microprocessors 24, and which control means 1,2,3 . . . further contain lift cage drive means 4 and a control apparatus controlling the lift cage drive means 4. The microcomputers 14 constitute a data processing unit 18, which in the joint-controlled lift battery, together with the data processing units 18 of all the other control means 1,2,3 . . . belonging to the battery and controlling separate lift cages, also carries out the controlling of the battery.

Abstract: Operational control system for lift and elevator machinery adapted for electrodynamic braking, said operational control system being adapted to be connected to the machinery of existing lift or elevator equipment. The operational control system is designed for one-speed A.C. synchronous motors of the short-circuit type forming part of operational control units provided with a simple mechanical brake. The operational control system improves the stop-plane exactitude and reduces brake wear. In the operational control system electrodynamic and mechanical braking is combined, the control being performed via a reference voltage formed from an output signal received from a speed-sensing member.