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

Thu Jan 23 19:35:04 PST 2025

Steve,  I took my scope meter today and checked wave forms at all points.
All were clean sine waves. I checked the breaker connections and all
connections back to the inverter and all were tight.
Voltage drop when pump kicked on was small and only about 1 volt when
running. Amp were 12 on both legs.

On Thu, Jan 23, 2025 at 9:48 AM Jay via RE-wrenches <
re-wrenches at lists.re-wrenches.org> wrote:

> Are the amps leg the same?
> Jay
>
> On Jan 22, 2025, at 9:29 PM, Steve Higgins via RE-wrenches <
> re-wrenches at lists.re-wrenches.org> wrote:
>
> 
> 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.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
>>>> >
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>>>> --
>>>> Christopher Warfel, PE
>>>> ENTECH Engineering, Inc.
>>>> PO Box 871, Block Island, RI 02807
>>>> (401) 447-5773
>>>>
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