It should be possible to test it with a low current supply. Energize the
different windings with 110V or something with an inline resistor to
reduce the current, then measure the other windings to verify the ratios.
bp
<part15sbs{at}gmail{dot}com>
On 11/26/2016 11:19 AM, Chuck McCown wrote:
Not ABB, a brand I have not seen before. Lenze I think.
I just hope if I have to replace it I can figure out how to get the
parameters out of the old unit and put them in the replacement.
*From:* Jaime Solorza
*Sent:* Saturday, November 26, 2016 11:51 AM
*To:* Animal Farm
*Subject:* Re: [AFMUG] OT 3 phase transformers
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 *LenzeChuck
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?$smthumb$
<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 <tel:406-449-3345> | Address: 3577
Countryside Road, Helena, MT 59602
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