Not strictly EMC but I am sure people here will know the answer. We all know that a 3-phase VFD can often be used off one-phase. Since all the current is then pulled off the one leg of the input rectifier, the standard wisdom says that you derate the VFD power in this situation by a factor of 2 or so.
It occurred to me that since the input circuit should be just a 3-phase rectifier, it should work to connect all three input terminals together, and feed that from the single phase. Would it work on the VFDs you're familiar with? I can see that, while equalizing the load across the rectifiers, this scheme doesn't help with power variation within the 50/60Hz cycle, so some derating is still called for, I think. ------------------------------------------------------------------------------ Monitor your physical, virtual and cloud infrastructure from a single web console. Get in-depth insight into apps, servers, databases, vmware, SAP, cloud infrastructure, etc. Download 30-day Free Trial. Pricing starts from $795 for 25 servers or applications! http://p.sf.net/sfu/zoho_dev2dev_nov _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
