mikeybmdb32
Member
I'm having difficulty understanding why variable torque VFD's have a higher current rating than constant torque VFD's. Is it assumed that the variable torque VFD will be running below it's maximum speed all of the time?
It is usually to do with the short term overload capability. I have seen variable torque drives with a short term overload capacity of 110% (i.e. rated capacity plus 10%) and constant torque at 150%.I'm having difficulty understanding why variable torque VFD's have a higher current rating than constant torque VFD's. Is it assumed that the variable torque VFD will be running below it's maximum speed all of the time?
Nothing wrong with doing that.And for those of you who also frequent the other fora I participate in, yes this is a copy of another post of mine...