Relay supervision system

Details Relay supervision system Relay supervision system

1990-08-22

1993-09-07

Weldon, Ulysses

Communications: electrical

Continuously variable indicating

With meter reading

34082516D, 34082517D, G05B 2302

Patent

active

052433366

ABSTRACT:
A relay supervision system is disclosed to check the presence and operability both of a relay and the associated circuitry located at a position remote from the control unit which effects the supervision. The supervision is accomplished by pulsing the relay with energy at a volt-time integral less than that required to energize the relay and displace a contact set, but sufficient to cause current flow through the winding and its associated circuit components. If the relay includes two separate windings, each winding can be separately pulsed at different times, the relay state determined, and both windings effectively supervised without changing the position of the contact sets operated by the windings. Energy is saved by terminating current flow through the just-energized relay winding as soon as the relay contact set is driven to its desired position

REFERENCES:
patent: 4405922 (1983-09-01), Nishino et al.
patent: 4507652 (1985-03-01), Vogt et al.

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