[TheForge] Fwd: Shop tools & layount (3-phase converter)

[James Binnion]

I have a VFD on my horizontal mill and a rotary for my other 
machines.  The VFDs work fine especially if you want/need infinite 
control of the speed of a machine but they are intended to be 
dedicated devices and can only run one motor. Some folks have talked 
about setting them up to be switched  from machine to machine but 
unless you are careful you can fry the VFD in an instant. They do not 
take well at all to having the output switched under power and you 
can just about guarantee frying the transistors if you do. The other 
drawback is that they tend to be the most expensive way to convert 
single phase to three phase, although I have been seeing less 
expensive surplus VFDs showing up on occasion. Also they are only 
available in the single phase to three phase configuration up to 3 HP 
if you need to control a larger motor then they require three phase 
input.

Jim Binnion

--- StripMime Report -- processed MIME parts ---
multipart/alternative
  text/plain (text body -- kept)
  text/html
The reason this message is shown is because the post was in HTML
or had an attachment.  Attachments are not allowed.  To learn how
to post in Plain-Text go to: http://www.expita.com/nomime.html  ---