Electrical transmission or interconnection systems – Plural load circuit systems – Selectively connected or controlled load circuits
Patent
1976-06-14
1978-07-18
Schaffer, Robert K.
Electrical transmission or interconnection systems
Plural load circuit systems
Selectively connected or controlled load circuits
307132M, 307140, 1376242, H02J 106
Patent
active
041017862
ABSTRACT:
Apparatus, and a related method, for proportionately varying from a master unit the durations of irrigation at a plurality of valve stations controlled by a number of satellite units, and for transmitting over a single pair of wires control signals for starting a programmed sequence of valve operations at all of the satellites in a selected one of two groups of satellites, or for resetting all of the satellites to a "home" position. One disclosed embodiment includes adjustable timing circuitry in the master unit to generate a timing signal which is transmitted to the satellite units over a separate wire, and is utilized to vary the duty cycle of a station timing motor which measures the durations of irrigation. In an alternate embodiment, station timing at each satellite is measured by means of a digital pulse counter, and the irrigation times at all of the stations can be varied to the same degree by adjustment of a variable-frequency pulse generator at the master unit.
REFERENCES:
patent: 3230401 (1966-01-01), Stelter
patent: 3591850 (1971-07-01), Holm
patent: 3604943 (1971-09-01), Bayer
patent: 3989066 (1976-11-01), Sturman
Panday Vinod
Ruggles Richard L.
Clemar Manufacturing Corporation
Feeney William L.
Schaffer Robert K.
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