I am trying to automate a 36" wide belt feed belt grinder for a friend.
It has a delta S1 vfd running the feeding belt with reversing ability.
We are trying to put some sort of control on either side of the machine which will sense when the steel plate material finishes the forward pass, stop the feed belt, reverse the feed belt and repeat. I am thinking about a wheel limit switch with NC/NO contacts.
The VFD has an input for manually reversing the unit via a 3 wire input.
Common ground to both:
Input 1---open=stop closed=run forward
Input 2---open=stop closed=run reverse

Page 96 of this PDF
http://www.delta.com.tw/product/em/drive/ac_motor/download/manual/VFD-S_manual_en.pdf

Anybody have any suggestions?