Quote Originally Posted by magicniner View Post
That's interesting, I have a couple of 1hp Siemens VFDs which are well over 10 years old and get daily use, standards must be slipping ;-)
...or Siemens don't push the limits quite as much as the Chinese? I seem to remember that the HY manual says that you need to re-form the electrolytics if the inverter isn't used for a year, and you should use a variable voltage supply and work up to full voltage slowly. My guess is that daily use is actually better for the caps than letting the thing stand unused for long periods. I try to use 105degC caps for high-power applications rather than the cheaper 70degC versions - maybe Siemens do as well!