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Device and method for switching off an inductive consumer without error

一种故障保护、电感性的技术，应用在紧急保护电路装置、用于限制过电流/过电压的紧急保护电路装置、电路装置等方向，能够解决运行人员危险等问题，达到大安全系数、降低同时故障的风险、避免过早击穿的效果

Inactive Publication Date: 2006-12-06
PILZ (COMPANY)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This is especially true for the monitoring of presses, since on the one hand a downwardly moving press represents a great danger for the operator and on the other hand the operator has to work very close to the press

Method used

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  • Device and method for switching off an inductive consumer without error
  • Device and method for switching off an inductive consumer without error

Examples

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Embodiment Construction

[0046] In the single figure, a typical embodiment of the entire novel safety switching device is designated with the reference numeral 10 . The safety switching device 10 here is, for example, an autonomously operable safety switching device in which all functional elements are compactly embedded in the device housing 11 . Alternatively, however, this can also be a circuit board of a composite safety controller, in particular a PLC (Programmable Logic Controller) designed for safety purposes. In another exemplary embodiment (not shown here), the installation switchgear 10 can be constructed with spatially distributed components, which are interconnected, eg by a bus system.

[0047] The safety switching device 10 has a signal processing section 12 . Here, the signal processing section 12 is constructed in several ways, depending on the intended use and the associated safety requirements. Thus, the signal processing part 12 is shown in a simplified manner with two microproces...

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Abstract

A method and a device for switching off an inductive load in a failsafe manner are proposed. According to one aspect of the invention, the method and the device are configured such that a predefined inductive voltage is generated during switch-off. The predefined inductive voltage is monitored by means of a monitoring circuit. In a preferred embodiment, the inductive voltage is set by means of threshold switches and the inductive voltage also is monitored by means of these threshold switches.

Description

technical field [0001] The invention relates to a safety switching device for failsafe switching off of an inductive load, in particular a magnetic valve in a hydraulic press; the invention also relates to a corresponding method. Background technique [0002] Typical safety switching devices in the prior art are used to reliably switch off technical installations, such as automated conveyor systems or hydraulic presses in the event of a dangerous situation, where "reliably" means "in a fail-safe manner". For this purpose, the inputs of the prior art safety switching devices are connected to signal generating devices such as emergency off buttons, light barriers, protective doors, rotational speed sensors and others. The safety switching devices evaluate the signals of these signal generating devices in a predetermined failsafe manner and, depending on this, the safety switching devices generate switching signals at their outputs, by means of which, for example, the drive of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F7/18H02H9/04H01H47/00
CPCH01F7/1844H02H9/047H01H47/002
Inventor H·施文克尔T·莱特曼M·胡夫纳格尔
Owner PILZ (COMPANY)
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