MONTAGE SERVANT A CONTROLER LES AMPLIFICATEURS ET LES SOUPAPES DE SECURITE, NOTAMMENT D'UN DISPOSITIF ELECTRONIQUE DE COMMANDE DE SECURITE D'UNE PRESSE

The invention relates to a circuit arrangement for the simultaneous monitoring of the function of the amplifiers (5; 6) and of the press safety valves (7; 8) of a double channel electronic press safety control device having two identical, mutually independent control channels (1; 2) and a monitoring channel which is fed by a frequency generator (15) with a pulsed alternating voltage. The invention is intended to increase the safety and reliability of the press safety control device with little outlay in terms of control by monitoring the function of the amplifiers (5; 6) and of the press safety valves (7; 8) in a failsafe manner, in which case no additional constructional elements are required for the electrical isolation of the logic and the output part and only identical signal levels being intended to be compared with one another. According to the invention, this is achieved in that the output signals of the position or compressed air signals of the press safety valves (7; 8), which signals are compiled by the AND gates (13; 14), are fed to one or more control stages (16), which are integrated in the monitoring channel, and monitored. DANS CE MONTAGE SERVANT A CONTROLER LE FONCTIONNEMENT DES AMPLIFICATEURS 5, 6 ET DES SOUPAPES 7, 8 DE SECURITE D'UN CIRCUIT DE COMMANDE D'UNE PRESSE, COMPORTANT DES CANAUX DE COMMANDE 1, 2 ET UN CANAL DE CONTROLE ALIMENTE PAR UN GENERATEUR DE FREQUENCE 15, LES SIGNAUX DE SORTIE DES SOUPAPES 7, 8, REUNIS PAR DES PORTES LOGIQUES ET 13, 14, SONT ENVOYES A UN OU PLUSIEURS ETAGES DE CONTROLE 16 INTEGRES DANS LE CANAL DE CONTROLE ET Y SONT CONTROLES.APPLICATION NOTAMMENT AUX SYSTEMES DE SECURITE DES PRESSES.