text: <s>[INST] PowerFlex 525 on a Delta transformer Summary: PowerFlex 525 connected to a Delta transformer with high wildleg B phase.Normally if I were to spec a transformer for a project it's delta/wye (unless it like super huge right). But I have an issue were I need to test my communication on this tiny 525 drive. The only thing is the power available to me is from a delta secondary... This is a 3 phase system 230V. So it's grounded between two phases A &C have 120V on each A & C to ground. This results in phase B having like 214V ... now phase to phase it's 230,230,230 ... So I'm not worried about the converters or the DC link (bus, caps) I'm worry about the power module's internal power supply... if it 3 phase NP ... if it two legs NP.... If for some reason it's one phase to ground 120V then if that lands on B phase it would certainly fail. I can't tell how things are really connected inside the drive.. So if it 's a tiny transformer is 3 phase I'm probably okay with my test setup.. If power goes across just two points then the I'm probably okay here as well...However it the internal supply goes from phase to ground ... then I have a one in three chance that there will be a problem. You know with a bigger I could just open it up and have a lokn but this little drive looks like I mint break it if I tried to one it up... Please help do you know how the drive is powered internally? Or have you seen this configuration was it an issue..??? I don't see away way to power the drive controller from an external supply??? [/INST] 525 drives are rated for single-phase operation at 35% of drive capacity. The derating will not affect you if all you're doing is verifying communications. If you know for a fact that it is always the B leg that is high, why not just hook up A and C only? \\n </s>