Circuit arrangement having an emergency stop switch of a hoist
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United States of America Patent
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Jul 5, 2016
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N/A
app pub date -
Nov 9, 2011
filing date -
Nov 11, 2010
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Abstract
The invention relates to a circuit arrangement comprising a hoist controller (12) of a hoist (10), a control pendant (12) having an emergency stop switch (2), and a control line (3) which electrically connects the hoist controller (12) to the control pendant (12) and has a control voltage applied thereto. In order to provide a circuit arrangement for monitoring an emergency stop switch of a hoist having a pendant switch, which circuit arrangement can be used to reliably detect a short circuit, it is proposed to assign a controller (1) to the emergency stop switch (2), which controller superimposes a cyclical pulse on the control voltage, and to design the hoist controller (12) in such a manner that said hoist controller monitors the cyclical pulse and switches the hoist (10) to a safe state in the absence of the cyclical pulse.
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