We work with ABB mostly... They have internal protection... On Nov 26, 2016 10:20 AM, "Ken Hohhof" <[email protected]> wrote:
> “This is why we can’t have nice things.” > > > > *From:* Af [mailto:[email protected]] *On Behalf Of *Chuck McCown > *Sent:* Saturday, November 26, 2016 10:49 AM > *To:* [email protected] > *Subject:* Re: [AFMUG] OT 3 phase transformers > > > > I would have to be standing in front of it to tell you. I think the low > input voltage may have caused it to draw more current than designed for. I > hope that if I open it up I will find a blown fuse or blown trace. My son > saw an arc flash coming from inside it when it failed. It is used to > control the speed of some blower motors. > > > > *From:* Jaime Solorza > > *Sent:* Saturday, November 26, 2016 8:11 AM > > *To:* Animal Farm > > *Subject:* Re: [AFMUG] OT 3 phase transformers > > > > 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> > >
