Posted by Jim Wilkins on February 24, 2010, 6:42 pm
> ...
> Dell is smoking crack.
Can't say, never worked there.
http://www.tti-test.com/solutions/61000-3-2.htm
"Harmonic currents" basically means the power supply draws a current
that isn't constantly proportional to the line voltage. The rectifier
input to a normal "switched mode" PC power supply only draws current
during the voltage peaks, pretty much matching the step output of a
UPS.
jsw
Posted by Ron Rosenfeld on February 24, 2010, 8:44 pm
wrote:
>> >In that case it may fail. Maybe get a new PSU for your dell if it
>> >doesn't work. Won't hurt to try it though
>>
>> Yeah, it may. I was hoping that there was someone around who had tried
>> this combination.
>> --ron
>I haven't tried it, but a little searching shows that the new Dells
>implement Power Factor Correction to save the planet from the evil of
>incorrect power factors, which add a load on the electric grid that
>the power companies can't charge to home users. In simple terms power
>factor is the difference between the Wattage and the Volt-Amp ratings
>of a UPS.
>Apparently they needs a purer sine wave input than stepped inverters
>provide, Dell suggests the APC SmartUPS line and will be happy to sell
>you one.
>http://www.dellups.com/
>jsw
I suspect they are probably doing because some European commission says
they have to. And it's less expensive for them to just make one power
supply than to have a selection. I've read that servers, and other types
of high-end IT equipment, already have these kinds of power supplies.
But I'll bet that if a large customer spec'd a non-PFC PSU, Dell would
likely accomodate them.
--ron
Posted by Daniel who wants to know on February 25, 2010, 2:42 am
> I suspect they are probably doing because some European commission says
> they have to. And it's less expensive for them to just make one power
> supply than to have a selection. I've read that servers, and other types
> of high-end IT equipment, already have these kinds of power supplies.
> But I'll bet that if a large customer spec'd a non-PFC PSU, Dell would
> likely accomodate them.
> --ron
The active PFC normally has nothing to do with not working on MSW power. I
have a GE electronic fluorescent ballast (GE-232-MAX-H) with active PFC that
is rated to run on anything from 100-300 volts AC and not only will it work
on MSW power but it works on straight 160V DC power too. (from the DC rail
before the output FETs on an MSW inverter.
Posted by Ron Rosenfeld on February 25, 2010, 3:42 am
On Wed, 24 Feb 2010 20:42:32 -0600, "Daniel who wants to know"
>The active PFC normally has nothing to do with not working on MSW power. I
>have a GE electronic fluorescent ballast (GE-232-MAX-H) with active PFC that
>is rated to run on anything from 100-300 volts AC and not only will it work
>on MSW power but it works on straight 160V DC power too. (from the DC rail
>before the output FETs on an MSW inverter.
Then what do you think the reason is for what I am experiencing?
Certainly there can be differences in different PSU's, and it wouldn't
surprise me if some PFC PSU's work OK on some non-sine-wave power sources.
I do know, however, that a Dell XPS 9000 will not work with an APC BackUPS
1500 RS unit which is rated at 865W/1500VA.
There are some reports on the 'net of people who have certain brands of PFC
computer PSU's that seem to work OK, but there are many, many complaints
and reports of people who solved the problem by replacing their
non-sine-wave UPS with a pure sine wave UPS (often of smaller size).
The Dell PSU has a rating 475W maximum, so I don't think that inrush
current should be the reason for it dropping off when the UPS switched to
battery backup. (While running, the XPS 9000 and a 22" LCD monitor were
drawing 155 watts; but I have no way of measuring inrush current).
--ron
Posted by Daniel who wants to know on February 25, 2010, 3:57 am
> Then what do you think the reason is for what I am experiencing?
> Certainly there can be differences in different PSU's, and it wouldn't
> surprise me if some PFC PSU's work OK on some non-sine-wave power sources.
> I do know, however, that a Dell XPS 9000 will not work with an APC BackUPS
> 1500 RS unit which is rated at 865W/1500VA.
> There are some reports on the 'net of people who have certain brands of
> PFC
> computer PSU's that seem to work OK, but there are many, many complaints
> and reports of people who solved the problem by replacing their
> non-sine-wave UPS with a pure sine wave UPS (often of smaller size).
> The Dell PSU has a rating 475W maximum, so I don't think that inrush
> current should be the reason for it dropping off when the UPS switched to
> battery backup. (While running, the XPS 9000 and a 22" LCD monitor were
> drawing 155 watts; but I have no way of measuring inrush current).
> --ron
Post the PSU manufacturer and FCC/UL ID numbers please. I have a Back-UPS
Pro 650 (BP650SX107) hooked to an MK 22NF gel wheelchair battery for my
computer and dual 19" CRT monitors (Viewsonic A90f+, Dell (Sony) Trinitron
P990). Also have a BF500 w/ dying stock battery hooked to TV and HTiB.
No clue as to the PFC issue you are having.
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> Dell is smoking crack.