Sliver
Member
Hi Everyone, It's been a while.I have an opportunity to install a system that uses a 480V 3phase 4.4kW gearmotor driven by a 11kW VFD. Everything is from SEW Eurodrive. My problem is that I don't have 3 phase available at my site without either running a new service about a mile or installing a roto-phase converter. My thought was that since smaller drives can be configured single phase in, three phase out, what is preventing a larger drive from operating in this mode. I spoke to a Shneider rep and was told that their larger drives can be used in this manner as long as the drive is sufficiently oversized to allow for the higher currents on the 2 input leads and any drive parameters that override input phase loss faults are set properly. I called SEW Eurodrive Canada and the application engineer originally told me that the 11kW VFD was not made for single phase input, then he conceded it was possible in theory as long as the drive is sized properly and that there should be no need to jumper any faults. I really don't care to install the whole system to find that there is a snag and have to rush in a roto-phase converter. Any thoughts or experience in this area would be welcome. My last strange VFD project I was helped out immensely by this site and especially DickDV. Now I'm back to the well.
thanks,
Brian Silver