Device for the fail-safe disconnection of a consumer

US11037747B2 · kind B2 · utility

Assignee

• Pilz GmbH & Co. KG · DE

Inventors

• Dmitry Muravev · Esslingen am Neckar, DE
• Klaus Jörg Dannenmann · Esslingen am Neckar, DE

Key dates

• Filing date: Nov 28, 2018
• Grant date: Jun 15, 2021
• Expiry date: Jun 20, 2039

Classification

• Technology area (CPC G): Physics
• CPC primary: G05B9/02
• WIPO field: Electrical machinery, apparatus, energy
• WIPO sector: Electrical engineering

Abstract

A safety switching device for the fail-safe disconnection of an external consumer has an internal consumer and switching elements for connecting in parallel the internal consumer with the external consumer. Read-back taps are arranged between the switching elements, a first and second pole of the external consumer, and the internal consumer. A signal processing unit includes a testing device and a memory, in which a first error pattern set is stored. The testing device is coupled to the read-back taps and executes a switching test having a minimum of three temporally-separated test intervals. In each test interval, the testing device receives a read-back signal from each read-back tap in order to generate a first test pattern. To identify a fault, the testing device matches the first test pattern with the first error pattern set.