I have a really annoying problem.
I have 2 parallel reference planes. One needs to be a specific distance from the other, so that when one gets moved by a parameter, the other moves by a concomitant amount.
This is simple - I just add a dimension (e.g. 300 in the figure below) and lock it.
HOWEVER. Revit complains about constraints if I try to change "Height" numerically. E.g. if I type 4100 on the dimension. That said, if I DRAG, the height reference plane, there are no problems and the second reference plane gets moved as required.
Why? How?
Furthermore, when I set the offset to be determined by a formula (based on completely unrelated figures), e.g. =Width/2+Thickness, where 'Width' and 'Thickness' are the dimensions of a particular element, it positions the second reference plane appropriately. HOWEVER, now, it doesn't allow ANY changes to the "Height" plane.
All of the above seems very odd and inconsistent.
If you open the type properties dialog, are the parameters locked?
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When I delete the offset dimenions, THEN move the Height plane, I can re-assign the offset parameter (with the same formula) and it doesn't complain (see below, note the increased Height).
It's only when I try to move the plane while that constraint is there that it complains.
Another anomaly - I can only change the position numerically if, I first select the reference plane and then edit the dimension. When I attempt to edit the dimension directly or through the parameters window, it throws an error.
Can you upload the sample file?
For it to work as you expect it to, the parameter FIRST BLADE OFFSET need to be locked and the parameter Height Unlocked...However, if you lock the First, it will subsequently lock the Height because they are linked via the formula in Ver Array and Hor Array.
Conclusion...what you are experiencing is pretty much normal...You can"t always have it all. What you get depends on the relationships between parameters.
Two other things I noticed in your image:
Apart form the above...unless you are modeling this as a test or a training exercise, you could model a louver family using curtain wall...less hassle and more or less same result
YOUTUBE | BIM | COMPUTATIONAL DESIGN | PARAMETRIC DESIGN | GENERATIVE DESIGN | VISUAL PROGRAMMING
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What happens when you remove the formula "=First Blade Offset" from the Parameter "Last Blade Offset"?
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