An irrigation system solenoid operated valve control circuit, said control circuit having an input connecting to a half wave rectifier having a half wave rectified output, said half wave rectified output leading to a switching circuit interfaced with a turn on delay timer to time out a predetermined period before operating said switching circuit on said half wave rectifier passing current at an operational voltage, the output of the switching circuit connecting to an output for connecting to a solenoid of said solenoid operated valve, where the output includes associated therewith, a turn-off delay circuit. Share Facebook Twitter Pinterest. Share your thoughts with other customers. In an existing automatic sprinkler system installation, the solenoid operated valves are usually located below ground, and electrical cabling connecting the solenoid operated valves to a reticulation controller will usually be buried underground. Other portions of a typical controller are omitted from this description for convenience. In a particularly preferred and advantageous arrangement the turn-off delay circuit comprises a diode and capacitor connected in parallel, connected in series with an inductor, which when in circuit is connected across the load which is connected to the relevant output. In accordance with another aspect of the present invention, there is provided a method of independently controlling two loads connected to two power supplies by a source conductor and a return conductor, comprising connecting an encoder portion as described above between a source conductor and the power supplies, and connecting a decoder portion as described above between a source conductor and the loads.
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The DC voltage regulator 41 b supplies a ten volt reference voltage to a turn-on timer circuit 45 b formed by transistor Q 4resistor R 8capacitor C 6 and a red light emitting diode D 9. The varistor is used to clamp the input cable 25 and to capture any power spikes before they enter the decoder. Apparatus as claimed in claim 3 wherein the value of the capacitor and the value of the inductor are selected to delay turn off of the relevant output by holding the output high for a period of at least 0.
As will be appreciated, a return conductor will be required between the loads and the return of the current supply. Is 11 volts what the doubler should be reading with the station master porering it? In accordance with one aspect of the present invention there is provided apparatus to allow independent control of a first load and a second load in the form of solenoid operated valves in an irrigation system via a single conductor with a single common return. The decoder circuits 13 a and 13 b overcome problems encountered with modern controllers that incorporate diagnostics and fault over-ride features, which can be falsely tripped by prior art devices, leading to faulty operation.
Would you like to tell us about a lower price? Past experience tells me I should be somewhere around 5. A 27 volt varistor 49 b is provided across the turn off delay circuit 47 b and across the coil L 1 of the solenoid valve 17 b to capture any high current pulses that occur when the current to coil L 1 turns off and the coil field collapses.
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Similarly, a turn-off delay circuit 47 b is formed by inductor L 2sollenoid C 4 and diode D 6in circuit across the output 29 a and the common C or return, in circuit across the coil L 1 of the solenoid valve 17 b. Roubler control circuit as claimed in claim 17 wherein the value of the capacitor and the value of the inductor are selected to delay turn off of the relevant output by holding the output high for a period of at least 0.
Try this URL for testing with an ohm meter. AmazonGlobal Ship Orders Internationally. In this manner, viewing the circuit arrangement current flow using the conventional current convention, a positive going voltage at the first decoder input will be available at the first decoder output but douhler after the predetermined period has timed out, and a negative going voltage at the second encoder input will be available at the second decoder output but only after the predetermined period has timed out.
Circuit system for connecting an electrical consumer with an alternating-voltage source. Page 1 of 1 Start over Page 1 of 1.
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The output 23 of the encoder circuit 11 is connected to one end of a single conductor 25 which would have been, prior to modification of the irrigation system, typically connected already to the existing solenoid 17 a. It should be appreciated that the discussion is not an acknowledgement or admission that any of the material referred to was part of the common general knowledge as at the priority date of the application.
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All references to current flow in the following description are references to flow of conventional current. Loading recommendations for this item Apparatus as claimed in claim 7 wherein the low gate current triac is capable of switching with gate currents as low as 5 mA. I check from the common to the valve wire that is hot, I get 11 volts.
The apparatus has an encoder circuit 11 with two inputs 21 a 21 b for connection to the two AC sources, and an output 23 for connection to the single conductor 25and a decoder circuit 13 having an input 27 for connection to the conductor 25and two outputs 29 a 29 b for connection to loads 17 a 17 b respectively.
In solneoid decoder circuit 13 the diode 35 a conducts, resulting a negative voltage being available at half wave rectifier 34 output 39 a.
When the station 3 of the reticulation controller is turned doublrr and ddoubler power to the solenoid is removed there is a collapsing field generated by the coil L 1 of the solenoid valve 17 b. When the first input is energised, the first output will be energised, and when the first input is de-energised the first output will be de-energised and when the second input is energised, the second output will be energised, and when the second input is de-energised the second output will be de-energised.
I know I should check from the clock, but it’s way back there.
The turn off delay circuit may advantageously be an inductive turn-off delay circuit, and in a more preferred embodiment the turn-off delay circuit comprises from the output to common, an LC snubber circuit. A control circuit as claimed in claim 15 wherein turn-off delay circuit comprises a diode and capacitor so,enoid in parallel, connected in series with eolenoid inductor, which when in circuit is connected across the load which is connected to the relevant output.
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