What kind of VFD? On Nov 26, 2016 12:20 AM, "Chuck McCown" <[email protected]> wrote:
> Yeah, it is a German company and they are pretty stuck on 400/230 Y > connection. > It does kinda work on 208 but I think I blew out a VFD by trying it. > > *From:* Forrest Christian (List Account) > *Sent:* Friday, November 25, 2016 5:24 PM > *To:* af > *Subject:* Re: [AFMUG] OT 3 phase transformers > > The transformers you are looking for exist: https://www.grainger.com/ > product/ACME-ELECTRIC-General-Purpose-Transformer-49NT19?s_ > pp=false&picUrl=//static.grainger.com/rp/s/is/image/ > Grainger/49NR92_AS01?$smthumb$ > Of course a used one is preferrable. > > I'm assuming you've done the research to make sure it needs both 400VAC > and 240 to common. I know at least one machine I have here says it needs > 240V, but there isn't actually anything 240V on it - it really only needs > 120V, admittedly at twice the amperage. I've also seen gear which only > needs the leg-to-leg voltage, and doesn't use the leg-to-ground voltage. > > > > > On Fri, Nov 25, 2016 at 1:26 PM, <[email protected]> wrote: > >> So what I shoulda bought was a 240:480 and fed it with 208 for 416 out. >> >> -----Original Message----- From: [email protected] Sent: Friday, November >> 25, 2016 1:15 PM To: [email protected] Subject: Re: [AFMUG] OT 3 phase >> transformers >> I didn't think the saturation would happen without a load. >> Was only considering transformation ratio, dang. >> Never a problem with small signals... >> >> Still need to make 400 volts Y. >> I guess I am going to have to do some kind of boost or buck arrangement. >> -----Original Message----- From: Seth Mattinen Sent: Friday, November 25, >> 2016 1:10 PM To: [email protected] Subject: Re: [AFMUG] OT 3 phase >> transformers >> On 11/25/16 11:49, [email protected] wrote: >> >>> I purchased a used 30 KVA 208/240 2 phase transformer. 208Y 240 delta. >>> >> >> >> You're feeding 480 into a general purpose transformer that is rated for >> 240 (+-10% typical)? You're saturating the core and it's ceasing to be a >> transformer. Even if the breaker doesn't trip it'll probably overheat and >> burn with that much overvoltage. >> >> ~Seth >> > > > > -- > *Forrest Christian* *CEO**, PacketFlux Technologies, Inc.* > Tel: 406-449-3345 | Address: 3577 Countryside Road, Helena, MT 59602 > [email protected] | http://www.packetflux.com > <http://www.linkedin.com/in/fwchristian> <http://facebook.com/packetflux> > <http://twitter.com/@packetflux> > >
