SAFE TORQUE OFF PROCEDURE
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United States of America Patent
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Issued Date -
Oct 15, 2015
app pub date -
Apr 9, 2015
filing date -
Apr 10, 2014
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A method and an arrangement of producing a safe torque off procedure of an electrical drive including a control unit and one or more power units having controllable semiconductor switches. The method includes detecting a signal in a control unit indicating a requirement to stop the drive, generating, based on the detected signal, at least one safety-approved signal which when received in a power unit initiates shutting-down of the power unit, feeding the generated at least one safety-approved signal to one or more power units, and initiating the shutting down of the one or more power units upon the receipt of the at least one safety-approved signal, the at least one safety-approved signal initiating at least two different shut-down procedures of the one or more power units at different time instants.
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