Bruce EVangel Parmenter wrote:
>
>
> At 210 VAC at 50 amps the PFC-50 output was 72 amps at
> 105VDC. I ran the PFC-50 at this power level for 15 minutes.
> The 10-3 cable and connectors barely got warm.
>
> But the output current decreased as the pack voltage rose to
> 153VDC. At some point a ticking sound ocurred and
> progressively increased in frequency until the yellow limit
> led was visible. Otmar believed that was the PFC-50 current
> limiting circuit kicking in.
>
>
Bruce and Otmar: I need to know more about this event.
Something sounds a bit fishy. First that ticking sound should NOT be
present. If you get your volts up the yellow should come on with the
flashing blue. If you only get the Yellow, it's getting warm, If the
Yellow starts flashing it's now hot and the current should fall off.
There should be no current fall off before the yellow goes from dim
solid to bright flashing.
Volts limit should be solid bright yellow with blue flashing IF you
have Dip Sw 1 on for voltage engaged timer.
72 amps of 105 VDC. Ummm how did you get this number???? this is a VERY
hungry 132 volt Battery.
Also Your PFC50 is set to draw only 50 amps. of 120, or 208 or 240 or
anything inbetween.
Also I think Otmar's system is a inverter from a solar charged Battery
pack. If there is some kinda thermal cut back on the inverter this would
explain the funny ticking sound. Also if the output was a NOT a perfect
sine wave, then there are more questions. But thier is a thermal sensor
in the main inductor that if the core gets hot then you have a thermal
cutback also. I have never been able to verify if the main inductor
actually gets hot enough for this to occur. Suppose I should test that.
I do have some comfort knowing it's there, used or not.
That ticking AIN't Supposed to happen!!!!
> I shutdown by turning the current knob to off while the
> PFC-50 breakers were still on. This allowed the PFC-50 to
> continue to cool off by letting its fans run. But the amount
> of heat coming out of the PFC-50 would not even defrost a
> window. My hands says it was under 300 watts. The outside
> air was 70 degrees F, so the PFC-50 does not waste much
> energy on heat.
The worst efficientcy numbers are at 72 amps output with 120 volts
input. Max input and Max output amps. 220 VAC into 100 VDC, is better
but it's making a LOT of heat at this point. For contrast at 400 VDC
output and 240 VAC... it's scarey like 600 watts of waste heat.. The
watt log shows 654 watts of losses at 402 VDC and like 1800 at 150VDC.
Well these number were taken in July, and I have been warned to publish
them because they were not verified with the Scope and Wavestar. So...
By my numbers you make 5 x the waste heat at 100VDC output and 240VAC
input. HUmmm ... My guess is that you could have hit the theraml limits
at 105 VDC, but NOT at 150 VDC.
Rich Rudman
Manzanita Micro
www.manzanitamicro.com
1-360-297-7383,Cell 1-360-620-6266
