Question: can't extract units in a piecewise

Hello

I read this forum http://www.mapleprimes.com/forum/plotsunits  in which it says you have to extract units beforehand to plot.

The problem is that I have a lot of functions and I can't remove units by hand, so I wanted to use the command convert(........,unit_free) but  with no result

The function in the convert command is a piecewise. I upload the file

Thanks.

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