On Sep 2, 2011, at 11:41 AM, Alan J Fletcher wrote:
At 04:57 PM 9/1/2011, Horace Heffner wrote:
The total power of resisters (in your drawing) at 300 W + 300 W = 600
W seems low. Rossi states in Krivit's film he is using 748 watts,
from which I did the following computations:
http://www.mtaonline.net/~hheffner/KrivitFilm.pdf
In another demo the power was up over 1000 W.
I don't see wiring for any sensors that the controller might use in
the above photo. There is a white cable coming out of the back right
side in the film. It is not possible to tell if sensor wires are
included in the white cables along with the power wires.
I've seen no wires from the eCat to the computer. In this setup
Rossi looks at his computer screen and adjusts the power
controllers by hand.
Oh! I didn't get that. (Slaps forehead!) I just assumed they were
programmable controllers. Thanks for the info.
This is nonsensical to me. You can buy 1000 watt light dimmers at
Home Depot and other places very cheaply. Why go to the bother of
building the box?
http://www.homedepot.com/Electrical-Dimmers-Switches-Dimmers/h_d1/
N-5yc1vZ1xg1Zbnni/h_d2/Navigation?
langId=-1&storeId=10051&catalogId=10053&cm_mmc=SEM|THD|D27EElectrical|
DimmersLightControls&skwcid=TC|13168|%2B1000%20%2Bwatt%20%2Bdimmer||S|
b|7710963877
http://tinyurl.com/3vbjq5k
Gee, if choppers are used this creates transients in the input, and
invalidates the use of ordinary current meters or power meters.
Specs for the controller unit have been posted (here?) ... the
display reads 0 ... 9
As a first approximation they just modulate the power by chopping
it, so let's say it modulates the power linearly from 0/9 to 9/9.
Videos always show one set to '3' and one to '9'
R1 is known to be 300W
R2 is unknown
For Krivit the total power was 770W
Lewan says the controller power was 65W
So we have either
"9+3" : 9/9 * 300W + 3/9 * R2 = (770W - 65W) giving R2 =
1215W and maximum power at "9+9" is 1515W
"3+9" : 3/9 * 300W + 9/9 * R2 = (770W - 65W) giving R2 =
605W and maximum power at "9+9" is 905W
If we could trace the cables then we could pick the right one.
Or just take the average -- R2 = 910W and round it up to 1KW
The above makes no sense to me. Resistor wattage ratings are merely
the maximum wattage that can be put though them without the
expectation they will be destroyed. The power ratings are not used to
compute the power or current through them. If you put 600 W through a
300 W resistor you can expect it to soon burn out.
Best regards,
Horace Heffner
http://www.mtaonline.net/~hheffner/
