Elevator safety arrangement with drive prevention logic
First Claim
1. A safety arrangement of an elevator, comprising:
- sensors configured to indicate functions that are critical from the viewpoint of the safety of the elevator;
an electronic supervision unit, which comprises an input for the data formed by the sensors indicating the safety of the elevator; and
a drive device for driving the hoisting machine of the elevator, which drive device comprises;
a DC bus;
a motor bridge connected to the DC bus for the electricity supply of the elevator motor, which motor bridge comprises high-side and low-side switches for supplying electric power from the DC bus to the elevator motor when driving with the elevator motor, and also from the elevator motor to the DC bus when braking with the elevator motor;
a control circuit of the motor bridge, with which control circuit the operation of the motor bridge is controlled by producing control pulses in the control poles of the high-side and low-side switches of the motor bridge;
an input circuit for a safety signal, which safety signal can be disconnected/connected from outside the drive device; and
drive prevention logic, which is connected to the input circuit and is configured to prevent the passage of control pulses to the control poles of the high-side and/or low-side switches of the motor bridge when the safety signal is disconnected,wherein;
the signal conductor of the safety signal is wired from the electronic supervision unit to the drive device;
the electronic supervision unit comprises a mechanism configured to disconnect/connect the safety signal;
the electronic supervision unit is arranged to bring the elevator into a state preventing a run by disconnecting the safety signal; and
the electronic supervision unit is arranged to remove the state preventing a run by connecting the safety signal.
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Accused Products
Abstract
The invention relates to a safety arrangement of an elevator, which includes sensors configured to indicate functions that are critical to the safety of the elevator, and also a safety circuit, with which the data formed by the sensors indicating the safety of the elevator is read. The safety arrangement includes a drive device including a control circuit of a motor bridge, an input circuit for a safety signal that can be disconnected/connected from outside the drive device, and also drive prevention logic, to prevent the passage of control pulses to the control poles of high-side and/or low-side switches of the motor bridge when the safety signal is disconnected. The safety circuit brings the elevator into a state preventing a run by disconnecting the safety signal and removes the state preventing a run by connecting the safety signal.
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Citations
21 Claims
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1. A safety arrangement of an elevator, comprising:
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sensors configured to indicate functions that are critical from the viewpoint of the safety of the elevator; an electronic supervision unit, which comprises an input for the data formed by the sensors indicating the safety of the elevator; and a drive device for driving the hoisting machine of the elevator, which drive device comprises; a DC bus; a motor bridge connected to the DC bus for the electricity supply of the elevator motor, which motor bridge comprises high-side and low-side switches for supplying electric power from the DC bus to the elevator motor when driving with the elevator motor, and also from the elevator motor to the DC bus when braking with the elevator motor; a control circuit of the motor bridge, with which control circuit the operation of the motor bridge is controlled by producing control pulses in the control poles of the high-side and low-side switches of the motor bridge; an input circuit for a safety signal, which safety signal can be disconnected/connected from outside the drive device; and drive prevention logic, which is connected to the input circuit and is configured to prevent the passage of control pulses to the control poles of the high-side and/or low-side switches of the motor bridge when the safety signal is disconnected, wherein; the signal conductor of the safety signal is wired from the electronic supervision unit to the drive device; the electronic supervision unit comprises a mechanism configured to disconnect/connect the safety signal; the electronic supervision unit is arranged to bring the elevator into a state preventing a run by disconnecting the safety signal; and the electronic supervision unit is arranged to remove the state preventing a run by connecting the safety signal. - View Dependent Claims (2, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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3. A safety arrangement of an elevator, comprising:
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a safety circuit, which comprises mechanical safety switches fitted in series with each other, which safety switches are configured to indicate functions that are critical from the viewpoint of the safety of the elevator; and a drive device for driving the hoisting machine of the elevator;
elevator, which drive device comprises;a DC bus; a motor bridge connected to the DC bus for the electricity supply of the elevator motor, which motor bridge comprises high-side and low-side switches for supplying electric power from the DC bus to the elevator motor when driving with the elevator motor, and also from the elevator motor to the DC bus when braking with the elevator motor; a control circuit of the motor bridge, with which control circuit the operation of the motor bridge is controlled by producing control pulses in the control poles of the high-side and low-side switches of the motor bridge; an input circuit for a safety signal, which safety signal can be disconnected/connected from outside the drive device; and drive prevention logic, which is connected to the input circuit and is configured to prevent the passage of control pulses to the control poles of the high-side and/or low-side switches of the motor bridge when the safety signal is disconnected, wherein; the signal conductor of the safety signal is wired from the safety circuit to the drive device; the safety circuit comprises a mechanism configured to disconnect/connect the safety signal; and the safety signal is configured to be disconnected by opening a safety switch in the safety circuit.
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Specification