Stef Posted June 9 Share Posted June 9 Hi, I bought a Shelly Plus 0-10V Dimmer which I want to use with a variable frequency drive (VFD) to control the rotation speed of an asynchronous motor. https://www.amazon.com/CNweiken-Variable-Frequency-Converter-Regulation/dp/B09XM69TYT?th=1 The VFD accepts an input signal between 0 and 10 VDC which proportionally varies the motor's rotational speed. In my installation, the Shelly is powered in accordance with the instructions with a 220VAC voltage on the L and N terminals. It is well paired and connected to my Wifi. I access and control the Shelly without difficulty both via the http interface and Home Assistant. Surprisingly when I activate the Shelly and use the variator at 20, 50, 75% no VDC voltage is measured with a multimeter between the + and - terminals I would have expected to find a voltage between these 2 terminals, I measure tiny values, ex 0.25 VDC, but not the expected values Ex: 5 VDC with the dimmer set to 50% or 10VDC with 100% Can you help me understand this phenomenon? With the dimmer set to 50% I should be able to measure 5VDC between these terminals, right ? Is it correct to think that the Shelly provides an output between 0 and 10 VDC between the +/- terminals like an adjustable VDC power supply? Thx Stef Quote Link to comment Share on other sites More sharing options...
Members thgoebel Posted June 9 Members Share Posted June 9 (edited) The Shelly plus 0-10V Dimmer has a passive 0-10V output. It delivers no voltage, but a pulse wide modulated impulse train. Most LED drivers use PWM 0-10V inputs which deliver the necessary voltage of 10 V DC. To get an active 0-10V PWM output, you may use an additional Shelly Add-On plus: The 4,7kΩ resistor improves the linearity. It may be omitted if this tradeoff is negligible. Edited June 9 by thgoebel 1 Quote Link to comment Share on other sites More sharing options...
Alberto Posted June 21 Share Posted June 21 On 6/9/2024 at 9:48 PM, thgoebel said: The Shelly plus 0-10V Dimmer has a passive 0-10V output. It delivers no voltage, but a pulse wide modulated impulse train. Most LED drivers use PWM 0-10V inputs which deliver the necessary voltage of 10 V DC. To get an active 0-10V PWM output, you may use an additional Shelly Add-On plus: The 4,7kΩ resistor improves the linearity. It may be omitted if this tradeoff is negligible. This solution seems so smart! Great! I have been searching for months for something "easy" like this. I will try as soon as possible. Do I have to configure something specifically by shelly app on Add-on side? Quote Link to comment Share on other sites More sharing options...
Members thgoebel Posted June 21 Members Share Posted June 21 1 hour ago, Alberto said: Do I have to configure something specifically by shelly app on Add-on side? No. The Add-On delivers 10V DC “off the shelf”. 1 Quote Link to comment Share on other sites More sharing options...
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