I just got a call out a few days ago to a plant we take care of. Unit is like 11 landing AC traction galaxy controller with HPV600 drive. Well come to find out I have a power problem in my drive. Its surging and then coming way down and shutting down the unit on an intermittent basis. so I get the quote to replace the thing and they dont produce the 600 anymore, you have to upgrade to the series 2 900. so we are, and I haven't gotten the drive yet, but they say its wiring is different and Ill have to reload the parameters(no big deal). But question to you guys is, have any of you ever made this specific upgrade yet? If so how different is the wiring. these were not installed by me or my company, and over the years plans and final construction notes have had a tendency to walk off before we took over. If its just different locations of termination then Im sure it wont be too much of a headache. Just wondering if there is anything I should prepare for before I show up there.