Remotely actuated, circuit testing emergency stop apparatus...

Details Remotely actuated, circuit testing emergency stop apparatus... Remotely actuated, circuit testing emergency stop apparatus...

2005-04-19

2005-04-19

Deb, Anjan K. (Department: 2858)

Electricity: measuring and testing

Electromechanical switching device

Relay

C361S190000

Reexamination Certificate

active

06882155

ABSTRACT:
The present invention is a remotely actuated emergency stop (E-stop) switch, with equipment control circuitry, providing a method for testing the E-stop switch and control circuitry to assure circuit and switch integrity, anytime, without equipment operational interruption, and without negating the manual actuation function of the E-stop switch to immediately cut all power to the equipment. The E-stop switch includes a first relay governing a first control circuit and a second relay governing a second control circuit. Each control circuit governs a motor source control contactor, which, when closed, provides power to the equipment. Transferring energization, and motor control, from the first control circuit to the second control circuit, and vice-versa, allows testing, in turn, of the de-energized components of the E-stop switch and control circuitry while the equipment remains operational. Remote actuation and circuit monitoring and testing is controlled by a Program Logic Controller (PLC).

REFERENCES:
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patent: 6486674 (2002-11-01), Groenewold et al.
patent: 6734581 (2004-05-01), Griffis

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