one of the selected pulleys is already fixed

[HuddSyd]

I'm doing tests on both of us and I can't come to terms with it.
This is what I mean by interconnection
even putting the distance bond limits from a face of the mount the error always appears
and the constraints that I set apart from the 3 you said there is a mechanical coupling of type screw between the snail and the screw so that with the rotation of the pulley the support moves

 

[MassiVonWeizen]

the problem cannot and should not be the distance bond. verify that the other two support constraints do not give problems by suspending them alternately but leaving the distance active.

 

[HuddSyd]

suspending screw coupling does not give me error

 

[MassiVonWeizen]

We start from the fact that it is not a mistake, but a notice. then it is only visual because it does not preclude the operation that behaves exactly as you wish; that the rotation of the pulleys translates the support pigeon up and down to reach the limit distances set.
This must also be considered how such a mechanism would work in reality. the support pigeon it would continue to translate until the engine is stopped, interrupting the current somehow (e.g. an end stroke). in the absence of this event the support pigeon would collide with the bearing support and it would continue to push until something yields (strap, motor, screws...).
said this if you want to do the superfigo you can do the handling with collisions. activate the command moves component, put the option identifies collisions, put the option these components and select the ring support, bearing support and mounting; made this rewards on drag and wheel the pulleys... when the ring support finds a hindrance stops
see video

I add that you modeled really bad since the origin and plans of the parts are put to ca°o. the origin must be a valid or predominant point of geometry and if a particular is symmetrical one or more floors must cut it in half.in the ring support, for example, the original is not even close to geometry and the planes have nothing symmetrical

 

[HuddSyd]

I know I have shaped badly with the undefined parts compared to plane axes and origins
however you will use the collision handling
(a) the Commission's proposal for a Council Regulation (EEC) amending Regulation (EEC) No 1408/71 ;