Global Patent Index - EP 0563787 B1

EP 0563787 B1 19961106 - Monitoring circuit for computer controlled safety devices

Title (en)

Monitoring circuit for computer controlled safety devices

Title (de)

Überwachungsschaltung für computergesteuerte Sicherheitsgeräte

Title (fr)

Circuit de surveillance pour dispositif de sécurité commandé par ordinateur

Publication

EP 0563787 B1 19961106 (DE)

Application

EP 93104908 A 19930325

Priority

DE 4210216 A 19920328

Abstract (en)

[origin: EP0563787A1] The invention relates to a monitoring circuit for computer-controlled safety devices. The monitoring circuit described here is an arrangement which initially holds safety-relevant loads switched off by means of a safety relay (K) until a self-test of the controlling computer has been completed within required time conditions. A holding capacitor (C1) is connected in parallel with the drive path of the safety relay (K), which holding capacitor (C1) can be charged via a charging circuit (R1, V1) when the safety relay (K) is in the quiescent position (Nc), and, after charging has been completed, moves the relay into the operating position, subject to simultaneous application of a drive signal from the microprocessor, only when specified connection conditions for the safety-relevant loads are met. A remanence relay can be used as the safety relay (K) for defect locking. The monitoring circuit according to the invention uses the difference between the pull-in voltage and the tripping voltage of the safety relay (K). <IMAGE>

IPC 1-7

H01H 47/00; H01H 47/04

IPC 8 full level

H01H 47/00 (2006.01); H01H 47/04 (2006.01)

CPC (source: EP)

H01H 47/002 (2013.01); H01H 47/043 (2013.01)

Designated contracting state (EPC)

AT BE CH FR GB IT LI NL

DOCDB simple family (publication)

EP 0563787 A1 19931006; EP 0563787 B1 19961106; AT 145087 T 19961115; DE 4210216 A1 19930930; DE 4210216 C2 19940825; DE 4210216 C3 19970403

DOCDB simple family (application)

EP 93104908 A 19930325; AT 93104908 T 19930325; DE 4210216 A 19920328