Voltage-free control of roller shutters using a voltage-based controller.

Hello
I have an Elmes ST6H control unit for up to six roller shutters, and I’ve also bought a programmable up-down switch with an astronomical clock.
I wanted to connect it to the ST6H controller so that it could control all the roller shutters at once (up at sunrise and down at sunset); unfortunately, the ‘astronomical’ switch supplies 230V, whereas the control unit only has dry contacts.
I’d be grateful for any advice on how to solve this problem – would it be sufficient to use a contactor or a relay, and if so, which type?
Kind regards

What is the total power output of all the engines?

andrefff wrote:

What is the total power of all the motors?

Power isn’t a factor here, as the motors are connected to the ST6H control unit (each one separately), whilst the control unit has a ‘voltage-free’ connection to, for example, a timer switch, which should close the relevant circuit (up or down) thereby activating all the roller shutters at once (up or down); however, the ‘Astro’ timer I purchased supplies a voltage (for closing or opening) as it is designed to control a single roller shutter directly, rather than a group.
So now I need to use a relay that won’t supply voltage (up/down) from the timer but will simply close the circuit.

For example, like this

Thank you for the link,
would this one be any good too? Relay

Sure.

I’ve also found one that doesn’t need soldering: Relay2

You can also buy a stand for the one I linked to; in this case, it all depends on where and how you’re going to install it. You didn’t give any details, so I recommended the smallest one. The one from Aledrogo would also work – in fact, any model with a 230 V coil will do.

The total power of the motors is around 500 watts, but that doesn’t really matter anyway because the control unit has relays (one for each motor). The control unit has one input (the manual says it’s voltage-free), which raises or lowers all the roller shutters. For now, I’ve connected a standard two-way switch to it and it works. So I think it’ll also work with a timer controlling the relays.
Thanks again, and I’ll let you know next week once I’ve connected the relays.

I’ve connected two Relpol relays on sockets and everything’s working – thanks again for your help!