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AssigneeFagor, S. Coop.
InventorsGonzalo Fernandez, Eider Landa, Jose Amoriza, Eneko Muguerza
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Failsafe control circuit for electrical appliances whereby at least one electrical load (10) is activated, the control circuit comprising logic control means (1), operation switching means (8) between said electrical load (10) and a supply voltage (V), and a first drive circuit (6) which receives a first command signal (4) from the logic control means (1), said first drive circuit (6) acting on said operation switching means (8). It also comprises security switching means (9) between the electrical load (10) and the supply voltage (V), and a second drive circuit (7) which receives a second command signal (5) from the logic control means (1), said second drive circuit (7) acting on the security switching means (9) so that it closes said security switching means (9) only if said second command signal (5) is a pulse signal.
Failsafe control circuit for electrical appliances whereby at least one electrical load (10) is activated, the control circuit comprising logic control means (1), operation switching means (8) between said electrical load (10) and a supply voltage (V), and a first drive circuit (6) which receives a first command signal (4) from the logic control means (1), said first drive circuit (6) acting on said operation switching means (8), characterized in that it also comprises security switching means (9) between the electrical load (10) and the supply voltage (V), and a second drive circuit (7) which receives a second command signal (5) from the logic control means (1), said second drive circuit (7) acting on the security switching means (9) so that it closes said security switching means (9) only if said second command signal (5) is a pulse signal.
Failsafe control circuit according to any of the preceding claims, characterized in that it also comprises security switching means (13) between the first and second drive circuits (6,7) and its supply voltage (V2), and comprises a third drive circuit (12) which receives a third command signal (11), so that said drive circuit (12) closes said security switching means (13) only if the third command signal (11) is a pulse signal.
Failsafe control circuit according to any of the preceding claims, characterized in that a maximum operating time is set, after which the electrical load (10) is no longer energized.
Dependencies are inferred from the claim text.