Use OSPi to control GE Low voltage 24AC RR7 relays

[Tomg7]

Hi All,

I have some old GE Low voltage lighting system that works on 24AC relays. I am a software person with some very rudimentary electronics knowledge so I have these questions about the feasibility of what I am thinking. I am wondering if the OSPi would be compatible with these relays with different software.
They have one connection for on and one for off plus the common so I am thinking I would need to utilize two outputs on the OSPi for each relay.
The relays are of type RR7:

https://www.kele.com/lighting-controls/rr-7,-rr-9.aspx

325mA @ 24VAC

and they need a 50ms momentary pulse to activate the on/off. The relays retain their position in power outage so do not need constant power.

The other thing I wonder is if I retained the manual low voltage switches connected in parallel to the OSPi could this cause an issue?

COM -> RelayOn -> OSPi-OUT1
COM -> RelayOff -> OSPi-OUT2
COM -> RelayOn -> ./ . -> +24VAC
COM -> RelayOff -> ./ .-> +24VAC

The other thing to note is that the system has a diode at the 24AC transformer so it runs on half wave rectified 24AC so I wonder if I can supply this to the OSPi or does it require raw 24VAC.

Thanks in advance for any advice you might be able to provide,

Tom

[Tomg7]

The answer is yes just in case any one is googling RR7 relays. I bought the OSPI and hooked it up to my pi and a test relay and with a bit of python I could turn the relay on and off.

The GE part I want to replace with a modified open sprinkler is RMS-4A.

Thanks for creating this marvelous device!

[Author]

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