Apparatus for fail-safely disconnecting an electrical load; in particular in industrial production plants
US7130171B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 1, 2004 |
| Grant date | Oct 31, 2006 |
| Priority date | — |
| Expiry date | Apr 14, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05B9/03
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An apparatus for failsafe disconnection of an electrical load has a first and at least one second safety switching device. The first safety switching device has a first evaluation and control unit, an output and an electronic switching element, for producing a potential-related switching signal at the out-put under the control of the first evaluation and control unit. The second safety switching device has a second evaluation and control unit and an input. The input and the output are connected to one another via a single-channel connecting line, and the input supplies the second evaluation and control unit with the potential-related switching signal from the output of the first safety switching device. In order to fulfill safety standards for such kind of apparatus, the second safety switching device has at least two input circuits to which the potential-related switching signal from the output of the first safety switching device is supplied in a mutually redundant manner.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.