MichaelP
Titanium
- Joined
- Dec 7, 2008
- Location
- IL/WI border
I'm going to feed single phase 230V to a new to me TB Wood's 10HP VFD designed for 3-ph input.
The manual, although quite good, doesn't have any schematic diagrams or suggestions on how to do it optimally.
Based on simplified generic schematics below (and assuming that my VFD has the same rectifier type), I think that it may make sense to bridge the unused input leg to one of the used ones to help decreasing the current flowing through the diodes in this branch of the rectifier. Not that it will eliminate a need for de-rating, of course, but why not?
The only reason not to do it, as far as I can see, may be the idea to have a spare rectifier in case of diode failure in one of the other two branches. And this is a very valid idea, IMHO.
What are your thoughts? Do you think that the 3-ph rectifier in my VFD can be constructed entirely differently and this may affect the approach for a single phase input connection?
Link to the manual: Dropbox - TB Woods WF2 VFD Manual.pdf - Simplify your life
The manual, although quite good, doesn't have any schematic diagrams or suggestions on how to do it optimally.
Based on simplified generic schematics below (and assuming that my VFD has the same rectifier type), I think that it may make sense to bridge the unused input leg to one of the used ones to help decreasing the current flowing through the diodes in this branch of the rectifier. Not that it will eliminate a need for de-rating, of course, but why not?
The only reason not to do it, as far as I can see, may be the idea to have a spare rectifier in case of diode failure in one of the other two branches. And this is a very valid idea, IMHO.
What are your thoughts? Do you think that the 3-ph rectifier in my VFD can be constructed entirely differently and this may affect the approach for a single phase input connection?
Link to the manual: Dropbox - TB Woods WF2 VFD Manual.pdf - Simplify your life
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