Station timing selection circuit for irrigation controller

Details Station timing selection circuit for irrigation controller Station timing selection circuit for irrigation controller

1976-12-10

1978-10-17

Schaefer, Robert K.

Electrical transmission or interconnection systems

Switching systems

Switch actuation

239 70, 1376242, 307 41, H01H 700

Patent

active

041211146

ABSTRACT:
An improved irrigation control system of the type having a number of irrigation stations to be actuated sequentially, in which selected stations can be actuated for a relatively long time and the others for a relatively short time. In one embodiment, an additional capacitor is automatically connected in parallel with an existing timing capacitor at a time when shrub-watering stations requiring long-term irrigation have been scheduled for operation, when the system is positioned at a shrub-watering station, and when a switch is positioned to select long-term irrigation. In another embodiment, an additional capacitor is automatically connected in parallel with the existing timing capacitor when any one of a selected group of stations is actuated. The additional capacitor in this latter embodiment is switched in by means of a relay which is energized through a triac connected in series therewith, the triac being triggered by a gating signal derived from an actuating voltage applied to a valve solenoid associated with any of the selected group of stations.

REFERENCES:
patent: 3320431 (1967-06-01), DeBough et al.
patent: 3787728 (1974-01-01), Bayer et al.

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