Elevator safety arrangement with drive prevention logic
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United States of America Patent
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Oct 3, 2017
Issued Date -
N/A
app pub date -
Nov 5, 2014
filing date -
May 31, 2012
priority date (Note) -
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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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