[RE-wrenches] 120-240 Transformer loud vibration and humming.

[Steve Higgins]

How do their clocks run?   Is the Xfmer quiet down when the generator runs?

If you have an O-scope, check the output waveform off the inverter. My
guess is that the output waveform will be deformed, causing extra noise for
the Xfmer. You might be able to see this on the frequency as well. It
should be solid at 60Hz, but if it's drifting or way off the high side,
FETS have probably failed.

If you pull the top cover off the inverter the and you look at the FET
board, it'll be the fets closest to the Fan on the AC board.


[image: image.png]

Steve Higgins




On Wed, Jan 22, 2025 at 7:32 PM John Blittersdorf via RE-wrenches <
re-wrenches at lists.re-wrenches.org> wrote:

> Christopher,
> Update on the Transformer Humming.  Installed a new PSX-240 from Kirk and
> it is LOUDER than the T-240 that I took out.
> I have a call into the well driller to see if they have a record of the
> pump size or other details. When connected
> directly to the grid via transfer switch, still loud noise... same with
> battery only.  I did not check the 120VAC 30 amp break
> in the backed up loads sub panel. All other wiring was redone as I
> switched the pump directly to the grid until I received the
> new transformer and back to the inverter again. so all the connections
> were redone except the 120 breaker.
>
> John
>
>
> On Wed, Jan 22, 2025 at 10:30 AM Howie Michaelson via RE-wrenches <
> re-wrenches at lists.re-wrenches.org> wrote:
>
>> John,
>> If you need a T240 (internal or external), I have a few used ones (and
>> maybe a new one) in storage.
>> Howie
>>
>>
>> On Wed, Jan 22, 2025, 10:14 AM Christopher Warfel via RE-wrenches <
>> re-wrenches at lists.re-wrenches.org> wrote:
>>
>>> I could be a loose electrical or mechanical connection. It's been
>>> installed for a while and connections could have loosened up from
>>> expansion and contraction.
>>>
>>> On 1/18/2025 9:06 AM, John Blittersdorf via RE-wrenches wrote:
>>> > Hi Wrenches,
>>> >   I have a customer with an SW4024 installed in 2003 with the Trace
>>> > T220 transformer for
>>> > her well pump.  Recently it has started making a lot of noise when the
>>> > well pump comes on.
>>> > I checked the current on the well pump and it seems to be in the
>>> > normal range.  I have never had a transformer failure. Could this be a
>>> > failing transformer?
>>> >
>>> > Also, I have not been able to source a new one (Outback T240).  Are
>>> > there other brands
>>> > some of you may have used for a step up transformer?
>>> >
>>> > John Blittersdorf
>>> >
>>> > _______________________________________________
>>> > List sponsored by Redwood Alliance
>>> >
>>> > Pay optional member dues here: http://re-wrenches.org
>>> >
>>> > List Address: RE-wrenches at lists.re-wrenches.org
>>> >
>>> > Change listserver email address & settings:
>>> > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org
>>> >
>>> > There are two list archives for searching. When one doesn't work, try
>>> the other:
>>> > https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/
>>> > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org
>>> >
>>> > List rules & etiquette:
>>> > http://www.re-wrenches.org/etiquette.htm
>>> >
>>> > Check out or update participant bios:
>>> > http://www.members.re-wrenches.org
>>> >
>>> --
>>> Christopher Warfel, PE
>>> ENTECH Engineering, Inc.
>>> PO Box 871, Block Island, RI 02807
>>> (401) 447-5773
>>>
>>> _______________________________________________
>>> List sponsored by Redwood Alliance
>>>
>>> Pay optional member dues here: http://re-wrenches.org
>>>
>>> List Address: RE-wrenches at lists.re-wrenches.org
>>>
>>> Change listserver email address & settings:
>>> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org
>>>
>>> There are two list archives for searching. When one doesn't work, try
>>> the other:
>>> https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/
>>> http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org
>>>
>>> List rules & etiquette:
>>> http://www.re-wrenches.org/etiquette.htm
>>>
>>> Check out or update participant bios:
>>> http://www.members.re-wrenches.org
>>>
>>> _______________________________________________
>> List sponsored by Redwood Alliance
>>
>> Pay optional member dues here: http://re-wrenches.org
>>
>> List Address: RE-wrenches at lists.re-wrenches.org
>>
>> Change listserver email address & settings:
>> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org
>>
>> There are two list archives for searching. When one doesn't work, try the
>> other:
>> https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/
>> http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org
>>
>> List rules & etiquette:
>> http://www.re-wrenches.org/etiquette.htm
>>
>> Check out or update participant bios:
>> http://www.members.re-wrenches.org
>>
>> _______________________________________________
> List sponsored by Redwood Alliance
>
> Pay optional member dues here: http://re-wrenches.org
>
> List Address: RE-wrenches at lists.re-wrenches.org
>
> Change listserver email address & settings:
> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org
>
> There are two list archives for searching. When one doesn't work, try the
> other:
> https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/
> http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org
>
> List rules & etiquette:
> http://www.re-wrenches.org/etiquette.htm
>
> Check out or update participant bios:
> http://www.members.re-wrenches.org
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org/attachments/20250122/d90f7c71/attachment-0001.htm>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image.png
Type: image/png
Size: 299817 bytes
Desc: not available
URL: <http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org/attachments/20250122/d90f7c71/attachment-0001.png>