Abstract: The method of performing maintenance of an elevator is performed by unlocking and opening a landing door at a lowermost landing manually, activating a first stop button in the shaft, whereby a safety circuit of the elevator is opened so that operation of the car is completely prevented, entering into the shaft, closing the landing door, climbing down from the lowermost landing to the pit, turning a drive switch in a maintenance control unit positioned in the pit into a maintenance drive mode, whereby the first stop button is by-passed so that the car can be driven from the maintenance control unit upwards and downwards in the shaft.

Abstract: The present invention concerns an elevator comprising: an elevator shaft defined by surrounding walls and top and bottom end terminals; an elevator car vertically movable in the elevator shaft; an elevator hoisting machinery adapted to drive an elevator car; an electromechanical braking apparatus configured to brake movement of the elevator car; a first measuring device adapted to provide first position data and first speed data of the elevator car; a second measuring device adapted to provide at least a second position data of the elevator car; and a safety monitoring unit communicatively connected to the first measuring device and the second measuring device and configured to determine a synchronized position of the elevator car from the first and the second position data, and to determine an elevator car slowdown failure in the proximity of the top or the bottom end terminal from the first speed data and from the synchronized position of the elevator car.

Abstract: According to an aspect, there is provided a method for condition monitoring of inductive braking device of an elevator car in an elevator shaft, the method including determining that the elevator car is empty; determining that doors of the elevator car are closed; causing electromechanical brakes to hold the elevator car stationary in the elevator shaft; causing actuation of a braking condition for the elevator car with the inductive braking device; causing the electromechanical brakes to lift while the inductive braking device is in the braking condition; determining a value associated with the inductive braking device in response to causing the electromechanical brakes to lift while the inductive braking device is actuated; and determining an operating condition of the inductive braking device based on the value.

Abstract: An elevator includes a car with at least two car doors, each car door being provided with a door contact, a shaft being provided with corresponding landing doors, each landing door being provided with a door contact, each landing door opening in synchronism with the corresponding car door, the door contacts forming part of a safety circuit of the elevator, a car door contact input being connected to a middle point in the safety circuit between a series connection of the car door contacts and a series connection of the landing door contacts. A status information of the car door contact input is monitored in order to determine whether the door contacts are operational or not when the car doors are opened and/or closed with a predetermined time delay at a landing.

Abstract: According to an aspect, there is provided a communication system for transmitting safety information in an elevator system. The communication system comprises a first node; and a second node ; wherein the first node is configured to receive first safety information from a first safety node via two parallel communication channels, to convert the received first safety information into a serial form for transmission in a first safety message over a single communication channel between the first node and the second node and to transmit the first safety message to the second node over the single communication channel; and the second node is configured to receive the first safety message and to convert the first safety information in the first safety message back into the parallel form for transmission via two parallel communication channels to a second safety node.

Abstract: The invention relates to an elevator safety arrangement comprising a hoistway; an elevator car mounted in the hoistway; a working platform on top of the elevator car; at least one movable balustrade, which is movable between a substantially upright position and a substantially horizontal position; and a sensing arrangement for sensing position of the movable balustrade, said sensing arrangement for sensing position of the movable balustrade comprising at least one sensor for sensing position of the balustrade.

Abstract: A method for preventive maintenance of an elevator speed sensor system includes at least a first and a second sensor, which are independent of each other. The method includes: determining a reference distance for an elevator car travel between a first door zone and a second door zone, during the elevator car travel, defining continuously a first elevator car speed information from the first sensor and a second elevator car speed information from the second sensor, calculating a cumulative sensor system error by integrating the difference between the first elevator car speed information and the second elevator car speed information, and dividing the cumulative sensor system error with the reference distance to obtain a sensor system performance indicator.

Abstract: The invention relates to an elevator safety arrangement comprising a hoistway; an elevator car mounted in the hoistway; a working platform mounted on top of the roof the elevator car; at least one sensing arrangement for sensing load of the working platform and at least one balustrade. Said balustrade is mounted on the working platform such that its weight is carried by the working platform, and in that it is movable between a substantially upright position and a substantially horizontal position.

Abstract: A method for testing operation of an elevator including an elevator car includes starting movement of the elevator car; and thereafter starting a stopping sequence for stopping movement of the elevator car; and monitoring movement of the elevator car, the monitoring preferably including monitoring acceleration of the elevator car; and detecting a predefined response in movement of the elevator car, the predefined response preferably being cease of acceleration of the elevator car; and determining time elapsed between the starting a stopping sequence and the detected predefined response in movement of the elevator car, wherein the response is preferably cease of acceleration, for thereby determining reaction time of the elevator; and comparing the time elapsed with at least one reference, such as with at least one predefined threshold. An elevator is provided for implementing the method.

Abstract: The elevator comprising a car moving upwards and downwards in a well, a controller controlling the elevator, and a well lighting. The method comprises detecting a manual unlocking or a manual opening of a landing door, activating the well lighting automatically when the controller detects a manual unlocking or a manual opening of a landing door.

Abstract: The elevator comprising a car moving upwards and downwards in a well, a controller controlling the elevator, and a well lighting. The method comprises detecting an activation of a well access operation mode of the elevator, activating the well lighting automatically when the controller detects that the well access operation mode of the elevator has been activated.

Abstract: The arrangement comprises a drive driving an electric motor, a contactor and a control circuit connecting a control coil of the contactor to a power supply. The control circuit comprises a manual control part provided with a manually operated first switch, and an electronical control part provided with an electronically operated second switch and a processor controlling the second switch. The first switch and the second switch are connected in series in the control circuit with the power supply and the control coil of the contactor so that de-energization of the control coil of the contactor may be done either by the first switch or by the second switch.

Abstract: This invention relates to a method for defining absolute position information of an elevator car. The method comprises: obtaining continuously a pulse position information of the elevator car; and defining an absolute position information of the elevator car by adding a predefined correction value to the obtained pulse position information of the elevator car. The predefined correction value indicates a drift between the obtained pulse position information of the elevator car and the actual pulse position of the elevator car. The invention also relates to a safety control unit and an elevator system performing at least partly the method.

Abstract: A safety arrangement of an elevator and a method for monitoring electrical safety in an elevator system is disclosed. The safety arrangement of an elevator includes a motor drive of the elevator, which motor drive includes a main circuit, an accessible conducting part, which is earthed, an insulator, which is adapted to electrically insulate the aforementioned conducting part from the aforementioned main circuit and also a monitoring circuit, which is configured to determine an earth fault of the aforementioned main circuit occurring via the aforementioned conducting part. The monitoring circuit is configured to form a signal indicating the danger of electric shock in the motor drive of the elevator, if the aforementioned earth fault is diagnosed.

Abstract: A method for dynamically adjusting a levelling speed limit of an elevator car during a levelling operation includes obtaining an indication that the elevator car is detected to arrive to a zone; obtaining at least one value indicating the speed of the elevator car, in response to detecting that the elevator car arrives to the zone; and dynamically adjusting the levelling speed limit of the elevator car based on the speed of the elevator car. An elevator control unit and a system are provided to perform at least partly the method.

Abstract: A safety arrangement of an elevator and a method for monitoring electrical safety in an elevator system is disclosed. The safety arrangement of an elevator includes a motor drive having a main circuit, an accessible conducting part, which is earthed, an insulator, which is adapted to electrically insulate the aforementioned conducting part from the aforementioned main circuit and also a monitoring circuit, which determines an earth fault of the aforementioned main circuit occurring via the conducting part. The monitoring circuit forms a signal indicating the danger of electric shock in the motor drive of the elevator, if the earth fault is diagnosed.

Abstract: In modern elevators, safety circuits are used for preventing the operation of an elevator having possibly safety related problems. Sometimes the problem is in the safety circuit itself, and the operation could be continued. In a disclosed arrangement, groups of at least two independent safety circuits are used. The operation of the elevator can be continued in the case where one safety circuit in each group indicates that there is a possible problem. Thus, one deficient safety switch in one safety circuit does not prevent the operation.

Abstract: An access door arrangement of an elevator shaft, wherein at least one elevator car is moving, includes a door lock, whereby in connection with the door lock a reset switch of an inspection mode resetting device is located, whereby the door lock has a lock part movable between a lock position and an open position and whereby the reset switch is integrated in said door lock to be operated by the movement of the movable lock part or a related movable part. This solution allows an easy resetting of the inspection mode of the elevator.

Abstract: A method for testing operation of an elevator including an elevator car includes starting movement of the elevator car; and thereafter starting a stopping sequence for stopping movement of the elevator car; and monitoring movement of the elevator car, the monitoring preferably including monitoring acceleration of the elevator car; and detecting a predefined response in movement of the elevator car, the predefined response preferably being cease of acceleration of the elevator car; and determining time elapsed between the starting a stopping sequence and the detected predefined response in movement of the elevator car, wherein the response is preferably cease of acceleration, for thereby determining reaction time of the elevator; and comparing the time elapsed with at least one reference, such as with at least one predefined threshold. An elevator is provided for implementing the method.

Abstract: The method comprises unlocking and opening a landing door (25) at a lowermost landing (L1) manually, activating a first stop button (P1) in the shaft (20), whereby a safety circuit (S1, S2) of the elevator is opened so that operation of the car (10) is completely prevented, entering into the shaft (20), closing the landing door (25), climbing down from the lowermost landing (L1) to the pit (22), turning a drive switch (SW1) in a maintenance control unit (100) positioned in the pit (22) into a maintenance drive mode, whereby the first stop button (P1) is by-passed so that the car (10) can be driven from the maintenance control unit (100) upwards and downwards in the shaft (20).