Importance

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Abstract

A reset lockout for a control device which functions to control and monitor the essentially simultaneous energization of two electromagnets (61, 62) in response to a respective electric signal (S1, S2) applied to said electromagnets essentially simultaneously, wherein each electromagnet includes an element (71, 72) which in a non-energized state of the electromagnet takes a first inactive, normal position and which upon activation of the electromagnet is displaceable to a second active terminal position, wherein the control device is constructed to ensure that the displaceable elements (71, 72) of both electromagnets (61, 62) will be moved to their respective active end positions essentially simultaneously and then remain in said end positions provided that both signals (S1, S2) are applied essentially simultaneously and then both maintained. Sensor means are provided for ascertaining in each working cycle of the control device that both controls signals have been applied and that the displaceable elements of both electromagnets have been moved to their respective active end positions. The reset lockout is constructed to break the supply of current to the control device when this provision is not met.

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First Claim