Danesh, yes, I do projects like this all the time....it's kinda my "thing". I always start with the "over-all plan" as DickDV pointed out. VFD brand selection is done much farther down the line. To re-enforce.....the VFD must have the specific FEATURES you need. (for example: if, as you say, the "drive may control itself" you will need one with a PID feature you can understand or learn.) The NAME BRAND will be determined AFTER the required product features are met. Then you can use input re: support, training, warranty policies, etc....etc to select a BRAND NAME. I can't emphasize enough......START WITH THE BIG PICTURE AND WORK INWARD, instead of STARTING WITH THE VFD BRAND AND WORKING OUTWARD. Another consideration that rears it's ugly head is "price". In a "perfect" world, "price" would "be no object". My world is rarely "perfect". One must consider against whom they may be competing, etc. Are you employed by this plant? Or contracting? These things are a little off topic for this forum but SOMEBODY has to write the check(s) for the drives you select.....and keep writing them for mainenance....
Food for thought?
Stationmaster