How does the roller shutter actuator work without a neutral terminal? Types of compatible motors

Hello,
my question is more in the nature of a curiosity that does not give me peace of mind, rather than a technical problem. But to cut to the chase: I have found two similar roller shutter actuators that can be operated by remote control. The first one does not have a neutral terminal and the second one does. In the technical specifications of the first actuator, I only found information that due to the lack of a neutral terminal, it cannot be used for all motors. So here is my question: to which motors can such an actuator be used and how is it actually supposed to work without a neutral wire? (Where does it take the earth potential from?)

If someone could explain this to me, preferably on a diagram, I would be obliged.

Below are links to technical descriptions of both actuators (unfortunately only in German).

Thank you in advance for your help.

1. http://www.eltako.com/fileadmin/downloads/de/_bedienung/FSB61-230V_30200432-1_dt.pdf


2. http://www.eltako.com/fileadmin/downloads/de/_bedienung/FSB61NP_4824_internet_dtsch.pdf

How about this in Polish. What is an actor?

redsandman wrote:

In the technical specifications of the first actuator, I only found the information that, due to the lack of a neutral terminal, it cannot be used for all motors. And here is my question: to which motors can such an actuator be used and how is it actually supposed to work without a neutral wire? (Where does it take the earth potential from?)

If someone could explain this to me, preferably on a diagram, I would be obliged.

And how do bistable relays work, for example? You give any potential to the input, it can be either L or N. It works the same way.



That is, to drive it is sufficient to task any potential, it can be in phase.

Only problem is that the relay in your drawing has a phase and a neutral connected to it. Therefore the relay is able to recognise the control signal (it compares it with these two potentials). If you disconnect the neutral wire the relay will not operate.
This is exactly the situation in this case. Despite the lack of earth potential, the actuator works (but only with some motors). How is this possible?

Between the actor and the engine, is it nothing anymore?

It seems to me that this actuator was created for old installations where the power cable, the cable from the motor and the cable from the switch meet in a flush-mounted box where access is prevented and the cable between the box and the switch is a three-wire cable:



I believe that this actuator "takes" a potential other than the phase from the motor in order to operate itself. I just don't know how.

It can draw power from the phase (L) which it has connected directly and from the neutral (N) which is available to it through the motor windings. It can control, for example, the lift, and power itself through the "lowering" wire.