Re: Power conditioners and filters

<cbarn24050@xxxxxxx> wrote in message
news:1134575808.573235.214120@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

> Depends what kind of noise it is. RF will be removed with a simple
> filter.

>From what I've read, any change to a sine wave (e.g. a square wave) can be
thought of as many harmonics being added to it, esp high freq harmonics.
But I guess this doesn't count as RF, does it?

> Why is your earth floating?

The GenSet provides a floating earth and the UPS *was* set for M.E.N. We
converted the UPS to floating in case that was the problem. It wasn't.

AFAIK, floating earth simply means the Neutral is not tied to the earth
line. So, there's a potential between A-E and N-E which added together
provides the mains potential between A-N.

The earth wire is connected through the GenSet to a steel stake in the
ground.

> >
> > I now believe it is the noisy waveform that the GenSet supplies. It
provides
> > a reasonably steady 54Hz and 240V, but the waveform is quite noisy. In
> > particular, at peak voltage there is a > 10-20% short-lived voltage
drop.
> .
>
> These are caused by the capacitors in smps charging, you cant do much
> about them without spending lots of money.

Do you mean that the *cheaper* power conditioners (such as the APC I
mentioned) can't fix this in the waveform, or do you mean that no power
conditioner can fix it?

tia,
RR


.

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