DIAGNOSTIC ELEMENT FOR VALIDATION OF BOLT DETECTION OF A GUARD LOCKING SWITCH IN A STATIC STATE

An industrial locking switch includes an inductive sensing circuit that uses a non-contact technique to detect when the switch's locking bolt has transitioned to the lock position. The inductive sensing circuit can comprise an inductive coil, a capacitor, and a converter that converts a frequen...

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Bibliographische Detailangaben
Hauptverfasser:	CAI, Yongyao, WOLFE, Timothy P
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	ACCESSORIES THEREFOR BASIC ELECTRONIC CIRCUITRY BLASTING ELECTRICITY ENGINEERING ELEMENTS AND UNITS FIXED CONSTRUCTIONS GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS HANDCUFFS HEATING KEYS LIGHTING LOCKS MECHANICAL ENGINEERING PULSE TECHNIQUE SAFES SAFETY DEVICES IN GENERAL THERMAL INSULATION IN GENERAL WEAPONS WINDOW OR DOOR FITTINGS
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Beschreibung
Zusammenfassung:	An industrial locking switch includes an inductive sensing circuit that uses a non-contact technique to detect when the switch's locking bolt has transitioned to the lock position. The inductive sensing circuit can comprise an inductive coil, a capacitor, and a converter that converts a frequency of a current signal through the inductive coil to a digital frequency value. A controller detects when the locking bolt has advanced to the lock position by monitoring the digital frequency value for frequency shifts indicative of a disturbance of the induction coil's magnetic field by the locking bolt. To validate operation of the inductive sensing system without requiring actuation of the locking bolt, a diagnostic switch connects a diagnostic capacitor to the inductive circuit to simulate the frequency shift caused by the locking bolt, and the inductive sensing system is validated if the expected frequency shift is detected.