Safety circuit arrangement for failsafe shutdown of an electrically driven installation
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United States of America Patent
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Nov 24, 2020
Grant Date -
Jun 21, 2018
app pub date -
Dec 18, 2017
filing date -
Dec 20, 2016
priority date (Note) -
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Abstract
Safety circuit arrangement for failsafe shutdown of an electrically driven installation, comprising a safety switching device, having a safety switching relay that is configured to close or disconnect a power supply path to the installation in a failsafe manner, and a signaling device, having an actuator and a signal generator that is connected to the safety switching device by a first line. The actuator of the signaling device is interchangeable between first and second defined states and the signal generator is configured to generate a first clock signal on the first line only when the actuator is in the first defined state. Furthermore, the safety switching device is configured to draw electrical power from the first clock signal that is greater than or equal to the defined actuating power of the safety switching relay and to convert said electrical power to direct current for actuating the safety switching relay.
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