How does Low Voltage Compensation work?

Jon Danniken

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May 14, 2010, 3:09:47 PM5/14/10

to

Hi,

I notice some consumer air-conditioners (generally above 8,000 BTU) have a
feature called Low Voltage Compensation.

My question is, how does this effectively work, and by what mechanism?

I understand that any motor, and especially a compressor motor, has an LRA
(locked rotor amperage) rating which is several times that of the FLA (full
load amperage) rating, and that the LRA is one of the main reasons why it is
recommended that a plug-in type of air conditioner be located on its own
branch circuit.

Does the low voltage compensation scheme have the effect of reducing the
LRA, so that one would be able to have another device (like a lamp or a
television set) on the same branch circuit? If so, by how much does low
voltage compensation reduce the LRA?

Thanks for your time in helping me understand this,

Jon

Tony Hwang

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May 14, 2010, 5:08:49 PM5/14/10

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Hi,
My idea about this is power factor correction with a CV tranformer.

Jon Danniken

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May 15, 2010, 10:43:16 PM5/15/10

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Tony Hwang wrote:
>
> Hi,
> My idea about this is power factor correction with a CV tranformer.

Thanks Tony.

Jon

Grumpy

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May 16, 2010, 1:26:16 PM5/16/10

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"Tony Hwang" <drag...@shaw.ca> wrote in message
news:DZiHn.8381$jt....@newsfe04.iad...

> Jon Danniken wrote:
>> Hi,
>>
>> I notice some consumer air-conditioners (generally above 8,000 BTU) have
>> a
>> feature called Low Voltage Compensation.

Never hear of low voltage compensation!!!!!

>>
>> My question is, how does this effectively work, and by what mechanism?
>>
>> I understand that any motor, and especially a compressor motor, has an
>> LRA
>> (locked rotor amperage) rating which is several times that of the FLA
>> (full
>> load amperage) rating, and that the LRA is one of the main reasons why it
>> is
>> recommended that a plug-in type of air conditioner be located on its own
>> branch circuit.
>>
>> Does the low voltage compensation scheme have the effect of reducing the
>> LRA, so that one would be able to have another device (like a lamp or a
>> television set) on the same branch circuit? If so, by how much does low
>> voltage compensation reduce the LRA?
>>
>> Thanks for your time in helping me understand this,
>>
>> Jon
>>
>>
> Hi,
> My idea about this is power factor correction with a CV tranformer.

Please explain CV tranformer what is it???

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Oscar_Lives

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May 16, 2010, 8:28:52 PM5/16/10

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"Grumpy" <t.s...@verizon.net> wrote in message
news:hsovaq$1to5$1...@adenine.netfront.net...

>
> "Tony Hwang" <drag...@shaw.ca> wrote in message
> news:DZiHn.8381$jt....@newsfe04.iad...
>> Jon Danniken wrote:
>>> Hi,
>>>
>>> I notice some consumer air-conditioners (generally above 8,000 BTU) have
>>> a
>>> feature called Low Voltage Compensation.
>
> Never hear of low voltage compensation!!!!!

They are pretty quiet.

>
>>>
>>> My question is, how does this effectively work, and by what mechanism?
>>>
>>> I understand that any motor, and especially a compressor motor, has an
>>> LRA
>>> (locked rotor amperage) rating which is several times that of the FLA
>>> (full
>>> load amperage) rating, and that the LRA is one of the main reasons why
>>> it is
>>> recommended that a plug-in type of air conditioner be located on its own
>>> branch circuit.
>>>
>>> Does the low voltage compensation scheme have the effect of reducing the
>>> LRA, so that one would be able to have another device (like a lamp or a
>>> television set) on the same branch circuit? If so, by how much does low
>>> voltage compensation reduce the LRA?
>>>
>>> Thanks for your time in helping me understand this,
>>>
>>> Jon
>>>
>>>
>> Hi,
>> My idea about this is power factor correction with a CV tranformer.
>
> Please explain CV tranformer what is it???

Similar to a regular transformer, but has the CV design feature.

Grumpy

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May 17, 2010, 6:14:16 PM5/17/10

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"Oscar_Lives" <Oscar...@heaven.com> wrote in message
news:C-CdnR8nsZxZEG3W...@mchsi.com...

>
> "Grumpy" <t.s...@verizon.net> wrote in message
> news:hsovaq$1to5$1...@adenine.netfront.net...
>>
>> "Tony Hwang" <drag...@shaw.ca> wrote in message
>> news:DZiHn.8381$jt....@newsfe04.iad...
>>> Jon Danniken wrote:
>>>> Hi,
>>>>
>>>> I notice some consumer air-conditioners (generally above 8,000 BTU)
>>>> have a
>>>> feature called Low Voltage Compensation.
>>
>> Never hear of low voltage compensation!!!!!
>

> They are pretty quiet. = = = Oscar you right about that "not running"

I can see any compressor running trough a Constant Voltage Trans.
on top of that, it would may cost more the then AC itself
Example 1200VA, (=10Amp@120VAC )and waits Apx.75-80#
Some body giving some body A snow job?
Low voltage Compensation bull shit!