is this suppost to happen and is there a way to change the amount of rf modules consume?

The reason it is consuming 0 RF/tick is that it is not working. You are not getting the buff because it is too expensive. i.e. the machine can't actually get enough power to give you the effect. Try giving more power.

no im getting the effect if i sit on topof it i get regen 3 and saturation

Ah, well I see. You set the range and area VERY low so it is actually consuming 0 RF/tick because the RF consumption depends on the area that is covered. I'll change it to add a small offset so it can never go below some low value.

2.80 fixes this