Expanded time constant condition control system using a unidirec

Details Expanded time constant condition control system using a unidirec Expanded time constant condition control system using a unidirec

1978-07-28

1980-01-29

Hix, L. T.

Electrical transmission or interconnection systems

Switching systems

Condition responsive

328 72, 3403091, 236 1C, 236 91F, G05D 2324, H05B 102, G05B 1116

Patent

active

041863151

ABSTRACT:
A condition responsive time proportional control means which has a relatively fast time constant when operating in its proportional band has the time constant expanded by means of a digital counter. The counter is a resettable unidirectional type counter that has two counting channels. The main counting channel provides for the counting function during the normal cycling of the system when in the proportional band. A second channel in the counter acts to enable to the counter rapidly in the event that there is a disruption of the counter when the condition responsive system has been outside of the proportional band.

REFERENCES:
patent: 3443121 (1969-05-01), Weisbrod
patent: 3523182 (1970-08-01), Phillips
patent: 4041403 (1977-08-01), Chiapparoli

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