G203V progress report
Hi,
OK, I'm calling the G203V a Vampire drive now as in "cannot be
killed".:-)
I opened a new files section folder for it called "G203V". That
folder has two .gif files in it: Reverse 24VDC.gif and Reverse
100VDC.gif for your perusal. The G203V testing has now entered
exploring the wild-side operation phase.
Both are scope traces of the G203V with 24VDC and 100VDC applied to
the power input terminals but with the polarity reversed. Normally
this results in a satisfying flash of blue light, a sharp "crack"
sound and lots of smoke in that order.
The G203V pyrotechnic effects were far less spectacular; in fact
there weren't any. The only sequelae was a very dead 7A Picofuse; the
G203V was healthy and running once the fuse was replaced.
Note the reversed polarity current into the G203V at 100VDC; it
peaked at 250A. The drive saw less than 140mJ of energy though; (8V *
250A * 70uS).
The power supply had a 15,000uF cap charged to 100VDC. A 25A
contactor-type relay was used to apply that cap to the G203V with
real authority.:-)
The Tektronix Hall-effect current probe cannot accurately measure
250A. I used a 0.01 Ohm non-inductive resistor in parallel with a 0.1
Ohm non-inductive resistor in the current path. The current probe was
around the 0.1 Ohm resistor which acted as a 10:1 current divider.
Also note the fuse blew in 70uS. Now that's fast-blow!
If the G203V can take this and live, it can take anything.
Mariss