McChiel Posted April 6 Share Posted April 6 Dear experiencers New with Shelly (since a week or two). On my Shelly Pro 3, I see that the WiFi drops out very briefly when the central heating pump steps in/out (see attachment) Tried a lot but don't kno how to solve that? Quote Link to comment Share on other sites More sharing options...
Members thgoebel Posted April 6 Members Share Posted April 6 Would propose to attach a snubber (R/C circuit) across L and N of the pump. The pump is driven with one phase only, isn’t it? Quote Link to comment Share on other sites More sharing options...
McChiel Posted April 6 Author Share Posted April 6 Thank you thgoebel, Yes it's a one phase only pump. I'll gues it's the inductive load (pump is already 12 years old) So maybe time for a new one, AND the snubber as well 😉 Quote Link to comment Share on other sites More sharing options...
Moderators terae Posted April 6 Moderators Share Posted April 6 I would not use straight contact through Shelly to 3-phase motor. Not even high load one phase. Use motor use contactor instead and Pro 1 is enough. Too small contacts to have long lifetime... Quote Link to comment Share on other sites More sharing options...
Moderators terae Posted April 6 Moderators Share Posted April 6 3 hours ago, McChiel said: Thank you thgoebel, Yes it's a one phase only pump. I'll gues it's the inductive load (pump is already 12 years old) So maybe time for a new one, AND the snubber as well 😉 12 years old is mostly one without any kind of soft-start; it's not only inductive load but high inrush current. It's like switching on short-circuit and will cause always some material loss to relays. Quote Link to comment Share on other sites More sharing options...
McChiel Posted April 6 Author Share Posted April 6 Hi terae, Thank you for your reply, the Pro-3 is used for heaters on/off but is not on the drawing. The pump itself is not switched bij shelly but via a relais. (as you can see in the drawing) Quote Link to comment Share on other sites More sharing options...
McChiel Posted April 6 Author Share Posted April 6 Just now, terae said: 12 years old is mostly one without any kind of soft-start; it's not only inductive load but high inrush current. It's like switching on short-circuit and will cause always some material loss to relays. i know.. so i probably going for a new, high sofisticated pump as well Quote Link to comment Share on other sites More sharing options...
Moderators terae Posted April 6 Moderators Share Posted April 6 3 minutes ago, McChiel said: i know.. so i probably going for a new, high sofisticated pump as well It's most wise way when you happen to do modernizing and automation. Less problems, longer lifetime. RC is needed anyway to have no arc happen when switching off. Quote Link to comment Share on other sites More sharing options...
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