Hello guys, I'm wondering if i could use a Shelly uni for my gate opener. I'm a little confused; on knowledge base, it says UNI can support up to 24vac as output, but on product page/store it says 36vac. The voltage I need switched is 24~36vac peak. Can't I use it anyways since it will be switched for about 500ms?
Nice RD400 Gate Automation
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- Shelly Uni
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Nicco -
27. März 2022 um 05:29 -
Unerledigt
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At first, we have to discern between the supply voltage of the Shelly UNI (which must not be higher than 24V AC!) and the voltage the two outputs can handle: Both outputs are guarded against voltage spices by suppressor diodes (aka TVS diodes), which are activated at about 36 to 38 Volts (peak). Have a look at this (unfortunately in German language)
ThemaÜberlegungen zu den Schaltausgängen des Shelly UNI
Im UNI sind die beiden Schaltausgänge mit Optokopplern TLP172GM realisiert:
smarthome-forum.eu/attachment/20611/
Der Hersteller Toshiba nennt diese Bauteile „photo relay“:
smarthome-forum.eu/attachment/20604/
(Quellenangabe: Datenblatt der Fa. Toshiba)
Zwei MOSFET mit optisch empfindlichem Gate sind in Serie geschaltet, eine LED aktiviert diese. Die Daten sagen uns: Strom im on-Zustand max. 110mA, max. Spannung im off-Zustand 280V (empfohlen, Grenzwert bei 350V), Verlustleistung max. 300mW,…thgoebel23. Juni 2021 um 17:21 Thus, the planned application is critical: I may work - but there will be no guarantee…
And, by the way: Please keep in mind that maximum current switched by the digital output is 100mA!
Addendum #2: Welcome to the forum!
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Thanks! I did some testing and its voltage is 30vac, but of course, that won't remain constant. I think the UNI will work, maybe on a bad day, the diodes might conduct. I will take the risk.
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LOL, I just remembered that I'm measuring Vrms; I Almost fried the uni. It's actually about ~50Vpeak
Is it 36VAC (Vrms) or (Vpeak)?
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Used common sense, it's 36Vp. Need to find a suitable relay now