Beiträge von Elfrider

Thanks thgoebel, basically there can't be a load (consumer) connected at the same time to the switch input to the shelly.

I suppose I'll just stick with my current solution using the Scenes as it is working ok.

Thanks

Yes, output 1 is connected to my hot water system and everything is working fine using the scenes to switch Output 2. I could leave it like that with no issue it's just trying to understand why it doesn't work when I try to toggle via the s/w input.

Hi,

I'm trying to get my Shelly 2.5 to act with Relay 1 as the 'master' which is switched via the app/cloud only, and Relay 2 to act as a 'slave', with it's state always the opposite to that of Relay 1. This way the whole Shelly 2.5 will effectively act as one relay with an interposing NO & NC contact. Relay 2 is set as a 'hidden' device so it can't be accidentally switched (there are no safety implications if the they do switch on or off together btw so nothing to worry about there)

I can achieve this using two scenes: one scene turns Relay 2 OFF when Relay 1 is ON, and the other turns Relay 2 ON when Relay 1is OFF. However, I would prefer to leave a hardwired solution. I've wired the output from Relay 1 into the S/W input of Relay 2, then set the Relay 2 'Button Type' to 'Toggle Switch'. I've also ticked the 'Reverse Inputs' box, as I want Relay 2 to be the opposite of the S/W input state. However, the relay never changes state in either direction when Relay 1 comes on/off. I've confirmed voltage is/isn't present at S/W input 2 so it's not a wiring issue. Have I missed something? Any ideas please.

Thanks.

Thanks for the response. It’s not really a safety issue, nothing bad will happen if it switches wrong, as long as it worked 99% of the time and didn’t require me to constantly intervene it would be fine.

Sketch attached. As you can see when the HW Shelly is on the system is able to operate normally. With it off however it prevents any voltage ever reaching pin 2 of the valve which is what is need for it to move to “CH only” position. If the Shelly 2.5 does what I need I’d connect the “inverted” relay to pin 2 so that whenever it is off pin 2 becomes live.

Hi, it’s for my hot water control. I’m currently using two Shelly 1’s, one for hot water, one for central heating. I need a way of maintaining voltage on the three way valve when the hot water Shelly is off (I.e bypass the thermostat). Without this the valve can’t move to the central heating only position unless the hot water is on, in other words no central heating without hot water. I was hoping to replace the hot water Shelly 1 with a 2.5. My other option is to install an interposing relay driven by the current Shelly 1 but trying to avoid this if possible.

Hi,

I’m looking to buy a 2.5 for my application - I’m wondering if there is a way to make one relay always the inverse of the other? (Seeing as there is no Shelly product that has a normally open & normally closed contact off the same relay)

I know you can send url actions that will set relay 2 ON when 1 goes OFF and vice versa but this isn’t quite the same thing as it would still be possible to manually turn them both on/off together.

Thanks.