Changes made for Pathfinder PC.

A configuration was made for a RAS 4000 that needed a new drive. The previous drive was controlled though -10 - 10V, but the new one is 0 - 10V. Another change that is not confirmed on all other 4000's is that the clamp has a 10V pot for feedback instead of an incremental encoder. This might be a snowflake, but this design could be used on other RAS machines if their drive is also failing.