Rescaling means choosing another units for the variables e.g. tons instead of kg. Similar for the constraints.
Btw the problem might also be an attainment issue like if you do
\frac{1}{x} \leq 0.0, x \geq 0.
Clearly x has to be very large in any feasible solution. You may something along these lines in your model.
I suggest you think harder about your model to see whether it make sense from engineering point of view.