![]() So in reality, if you are planning to hook all shutters to your industrial 24VDC power supply and control these via relay boards using the polarity change, you may need to go over an additional hurdle. Once the shutter listens the modulated signal of the other, they both refuse to work until you switch off the relays or power supply, and enable just one of these to complete its function. It has nothing to do with the load, but it seems that there is built in protection avoiding hooking more than one window to one KUX. If two or more SML shutters are connected to one power supply, they immediately stop. * After that the shutter will work on any 24VDC polarity change Original here, author Pedroīut there is one more interesting thing I was not aware of. * Disconnect the supply before the motor quits the test phase (after ± 2 seconds) * Press 5 seconds on the reset button of the transformer, not the remote control * Connect and apply voltage on the KUX 100 If the motor has been connected, it can be reset in the following procedure: So I had to borrow one just for the purpose or the reset procedure. I did not find a way how to reset the roller without the KUX unit. We can just speculate about the reasoning here, it could be that someone have tested that piece before shipment and thus the roller was already connected to the Velux KUX control system which enabled the “smart” control modulated on the power-line. In my case, one of the four shutters I installed refused to follow the legacy polarity control. There are several guides found on internet about how to reset the shutter from the “smart” back to the legacy mode working with polarity reversal (+-24VDC). ![]() Known fact is that once you connect the shutter to the original KUX controller, since that moment the shutter no longer listens to the polarity change and expects KUX to give instructions. After some research I learned that due to some compatibility reasons these shutters can work in a polarity driven simple mode without the control unit. This makes it extremely difficult to connect to any master system. The problem with these units is that they only listen to the paired remote, and the device is not designed to accept any external commands. I have two rooms with Velux SML shutters. Now it is important to say, that all these Velux products are expected to be controlled by their dedicated control unit, for instance the already mentioned KUX 100. Let’s have a look how I integrated my Velux equipment (Shutters, Rollers, Power Windows) in the house, without the KUX 100 or 110 control unit. I am sure you are familiar with some of these limitations because you reached out to this post. Moreover, who wants to have a box full of remote controls these days, or a separate mobile app for each of the device you have at home? That approach is similar to the so called “smart bulbs” you control over an app in your phone to give you the “(not a real) smart home” feeling. There are several drawbacks, like space requirements, stand-by consumption, price and scalability. The overall architecture is a bit weird, utilizing a control unit KUX 100 which is receiving the IO radio commands and then sending these to the window over the 24V line. The usage of proprietary protocol is making this “black box” difficult to integrate and ![]() ![]() Integration of Velux roof components into home automation systems has been often criticized in many smart home forums. ![]()
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