An elevator control apparatus improves car position detection accuracy without increasing the number of sensors. A position detection sensor installed on a caroutputs a detection signal when an object installed in a hoistway is detected. A controller corrects a position of the car calculated on the basis of a pulse signal that an encoder which rotates in accordance with ascending and descending of the car outputs, in accordance with a position of the object to be detected. A storage device stores data on the position of the car calculated prior to a time point when the detection signal is received. A correction amount of the position of the car is calculated on the basis of a communication delay time and the data which is stored in the storage device, and the position of the car is corrected in accordance with the correction amount.

An elevator control apparatus improves car position detection accuracy without increasing the number of sensors. A position detection sensor installed on a caroutputs a detection signal when an object installed in a hoistway is detected. A controller corrects a position of the car calculated on the basis of a pulse signal that an encoder which rotates in accordance with ascending and descending of the car outputs, in accordance with a position of the object to be detected. A storage device stores data on the position of the car calculated prior to a time point when the detection signal is received. A correction amount of the position of the car is calculated on the basis of a communication delay time and the data which is stored in the storage device, and the position of the car is corrected in accordance with the correction amount.

A control system for an elevator includes a first car speed detection device and a second car speed detection device to measure a moving speed of the car, a hoist brake to apply braking to the hoist, emergency stop equipment to brake the car by grasping guide rails, and a control device to control the hoist, the hoist brake, and the emergency stop equipment based on outputs of the first car speed detection device and the second car speed detection device. If two pieces of velocity data that have been output from the first car speed detection device and the second car speed detection device respectively differ from one another and acceleration data of the car calculated from one that is higher of the two pieces of velocity data is equal to or more than a predetermined threshold, the control device decides if either car speed detection device is abnormal.

A control system for an elevator includes a first car speed detection device and a second car speed detection device to measure a moving speed of the car, a hoist brake to apply braking to the hoist, emergency stop equipment to brake the car by grasping guide rails, and a control device to control the hoist, the hoist brake, and the emergency stop equipment based on outputs of the first car speed detection device and the second car speed detection device. If two pieces of velocity data that have been output from the first car speed detection device and the second car speed detection device respectively differ from one another and acceleration data of the car calculated from one that is higher of the two pieces of velocity data is equal to or more than a predetermined threshold, the control device decides if either car speed detection device is abnormal.

The car is connected to the counterweight with a hoisting member and further with a free fall protection member passing over at least two free fall protection pulleys provided with at least one free fall protection brake, which is controlled by a free fall protection controller. The pre-tensioning of the free fall protection member is at least 50% smaller than the pre-tensioning of the hoisting member. The free fall protection member is formed of at least one cogged belt. Each free fall protection pulley is formed of a cogged pulley mating with the cogged belt.

The car is connected to the counterweight with a hoisting member and further with a free fall protection member passing over at least two free fall protection pulleys provided with at least one free fall protection brake, which is controlled by a free fall protection controller. The pre-tensioning of the free fall protection member is at least 50% smaller than the pre-tensioning of the hoisting member. The free fall protection member is formed of at least one cogged belt. Each free fall protection pulley is formed of a cogged pulley mating with the cogged belt.

A method for detecting a maintenance mode operation of an elevator system includes obtaining, by a monitoring unit being a separate unit arranged to an elevator car of the elevator system, motion data of the elevator car representing at least one drive motion profile of the elevator car; comparing, by the monitoring unit, the obtained motion data to at least one respective reference motion profile of the elevator car; detecting, by the monitoring unit, at least one deviation between the obtained motion data and the respective at least one reference motion pro-file, wherein the at least one deviation indicates at least one maintenance related operation; and detecting, by the monitoring unit, the maintenance mode operation of the elevator system in response to the detection of the at least one deviation. A monitoring unit, an elevator system, and a computer program for detecting a maintenance mode operation of an elevator system are also disclosed.

A method for detecting a maintenance mode operation of an elevator system includes obtaining, by a monitoring unit being a separate unit arranged to an elevator car of the elevator system, motion data of the elevator car representing at least one drive motion profile of the elevator car; comparing, by the monitoring unit, the obtained motion data to at least one respective reference motion profile of the elevator car; detecting, by the monitoring unit, at least one deviation between the obtained motion data and the respective at least one reference motion pro-file, wherein the at least one deviation indicates at least one maintenance related operation; and detecting, by the monitoring unit, the maintenance mode operation of the elevator system in response to the detection of the at least one deviation. A monitoring unit, an elevator system, and a computer program for detecting a maintenance mode operation of an elevator system are also disclosed.

A safety brake system for use in a conveyance system is provided. The safety brake system includes a guide rail and a conveyance component moveable along the guide rail. The safety brake system comprises: a safety brake moveable between a non-braking position where the safety brake is not in engagement with the guide rail and a braking position where the safety brake is engaged with the guide rail; a linkage mechanism; and an actuator for the safety brake. The actuator is configured to be mounted to the conveyance component. The actuator comprises an electromagnet switchable between a first state and a second state; and an actuation component configured to move relative to the electromagnet from a first position when the electromagnet is in the first state to a second position when the electromagnet is in the second state.

A safety brake system for use in a conveyance system is provided. The safety brake system includes a guide rail and a conveyance component moveable along the guide rail. The safety brake system comprises: a safety brake moveable between a non-braking position where the safety brake is not in engagement with the guide rail and a braking position where the safety brake is engaged with the guide rail; a linkage mechanism; and an actuator for the safety brake. The actuator is configured to be mounted to the conveyance component. The actuator comprises an electromagnet switchable between a first state and a second state; and an actuation component configured to move relative to the electromagnet from a first position when the electromagnet is in the first state to a second position when the electromagnet is in the second state.