ATV31/312 set up to follow an external 0-10vdc speed pot on AI1 and use the logic inputs for starting and stopping.
Altivar 31 and 312
All models in range.
Pot for speed control or 0-10v logic input for speed control.
Wire your external pot to AI1 com and +10vdc. (wiper wire on AI1)
Wire your Start forward command between LI1 and +24vdc.
Step 1: Go into the CTL menu enter
Step 2: Set Fr1 to AI1