Safety switching device

Details Safety switching device Safety switching device

1980-04-18

1982-05-18

Moose, Jr., Harry E.

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

For relays or solenoids

H01H 4700

Patent

active

043308104

ABSTRACT:
In automated systems such as press lines or related systems, a control circuit is typically designed to be intrinsically safe in acting on actuators which trigger movements of the presses. The actuators and/or the power amplifiers preceding them are connected to a load voltage supply circuit. In order to prevent unplanned movements during setting-up operations, when the safety circuits are partially disabled, which movements could be caused by a failure (e.g. fusing of a semiconductor component), the actuators and/or the power amplifiers preceding them are driven by the control circuit and are connected to the load voltage supply circuit by means of control keys, which trigger planned movements, via at least one zero-voltage-protected switching element.

REFERENCES:
patent: 2545549 (1951-03-01), Guill et al.

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