text: <s>[INST] PF700S Feed Source Summary: Use DC Bus or 3-phase AC power. Hi, Anyone knows the performance advantage if PF700S drive, feed from DC Bus versus 3-Phase AC power supply? PF700S will be use to control direct motor in torque mode. Thank you, [/INST] I don't really think this performance advantage is worh the required material investment. PF700S on-board DC power suppy is pretty capable and free when a drive is purchased; when properly observing the line/load requirements (isolation transformer or line reactor and the eventual load reactor) you will get pretty much a top tier torque/variable frequency system; an external DC power supply might be required for an extremely precise muti-drive system, however, more often than not, the VFD's DC Power Supply will do. \\n </s>