However, with a pump it will continue to run if you're using the MV connection to run the pump motor and all that pressure has no where to go. With an open solenoid, the controller cannot sense this and it will continue to run that zone though nothing happens. The controller was $110 at Lowe's, the solenoid was $11.īTW, the shorted solenoid read 2-3 ohms and a good one was around 42 ohms.
#Opensprinkler schematics how to
I know this since I was showing them how to troubleshoot. Since they didn't know anything about irrigation controllers they replaced the controller with a different Rainbird model, but this one would shut the entire controller down until the zone was removed from the program or the wire was disconnected. Its hardware schematic, firmware source code, user manual, and API document are all available at the OpenSprinkler Github repository (look for the prefix OSBee in the repository). The Rainbird ESP controller displayed an alarm for zone three and all the other zones continued to work. Just this week I fixed my neighbors irrigation by replacing a shorted solenoid. Most newer controllers will indicate a short and not damage the controller. Is the controller hand built or an ancient factory made one? Can you post a picture?Ī shorted solenoid will rarely, if ever, cause an in line fuse to blow. I think they eliminated the resistors on later versions.
#Opensprinkler schematics series
I think a 1A should be sufficient.Ī 2.2 ohm resistor is in series with each output but it doesn't limit the current to a reasonable value and burns up for shorts making a mess of the circuit board.
A typical zone is about 0.22A so the fuse seems like overkill. I separated the pi power so the fuse just feeds the zone outputs. This powers the raspberry pi circuit board and the zone outputs. The system has a 2A fuse in the 24VAC input. How does this protection work? It seems some use more sophisticated means that just a fuse that opens.
From what I have read it is not uncommon for a valve to fail with a short or low resistance and some controllers will report it.Īre most commercial controllers have some sort of short circuit protection so the controller isn't damaged by shorted valves? This controller is weak in this area and I have several zone outputs that are bad. My question is about protection from shorted valves. One of the reasons for it is I have a lot of zones and this is easily expandable. I have a diy sprinkler controller (opensprinkler) that is networked and has some nice features.
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