“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] <mailto:[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 <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?$smthumb$> &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] <mailto:[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] <mailto:[email protected]> Sent: Friday, November 25, 2016 1:15 PM To: [email protected] <mailto:[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] <mailto:[email protected]> Subject: Re: [AFMUG] OT 3 phase transformers On 11/25/16 11:49, [email protected] <mailto:[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] <mailto:[email protected]> | <http://www.packetflux.com/> http://www.packetflux.com <http://www.linkedin.com/in/fwchristian> <http://facebook.com/packetflux> <http://twitter.com/@packetflux> <http://ws-stats.appspot.com/t/pixel.png?e=setup_page_outlook_compose> <http://ws-stats.appspot.com/t/pixel.png?e=setup_page_outlook_active&uid=e965778f9a351fad7a8a860dffc144ce> <http://ws-stats.appspot.com/t/pixel.png?e=setup_page_outlook_active&uid=e965778f9a351fad7a8a860dffc144ce>
