Do you have your parameters backed up on a floppy? If not press F7 (Parameters) button then save (after putting a good floppy disk in drive) by pressing F6 .
Then hit F1 (setup) then F1 again and enter PROTO3 Then 3 when level prompt comes on screen.
Hit F5 (Misc) and check what is in spindle range parameter if in low your belts should be on the low range setting, Big pulley on spindle motor small pulley on spindle.
If you want high range you have to swap belt positions and change misc parameter for spindle range to High.
If you have to change a parameter in power settings you have to exit back to main screen and shut down control as it only reads those parameters on power up.
I believe you don't have to do that on the Misc parameters.
Ron