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Registered Member #1334
Joined: Tue Feb 19 2008, 04:37PM
Location: Nr. London, UK
Posts: 615
Steve McConner wrote ...
Nicko wrote ...
Its a mistake you make once only...
Yep, because if you make it twice they cancel out
Ho Ho!
Also should point out that this is not a good solution - the fail-scenario when the interrupter is turned off is then for the TC to go CW, so turn the TC off before the interrupter else the next failure mode you experience will involve expensive smoke...
As a general tenet of engineering practice, I always try to make failure modes "non-catastrophic". e.g., in the cap bank I'm making ATM, everything is designed to "fail safe", i.e. if the control logic has a problem, the HT side is automatically isolated, and when its in an isolated state, a bank of discharge resistors is engaged - most of this is electro-mechanical interlocking with contactors.
However, I'm sure at some point it'll inevitably explode...
Registered Member #1334
Joined: Tue Feb 19 2008, 04:37PM
Location: Nr. London, UK
Posts: 615
Steve McConner wrote ...
Will we see this project at Cambridge?
I hope so - it won't be in a pretty box though. Everything is a bit mental here at the moment... Middle of the rugby season... (well, start of it actually...). project still a pile of bits - board made up, everything individually tested. Need to reform the caps & some spares (!!) - they are BIG. Need to screw everything onto a board - waiting for a new small variac & a isolating step-up xfrmr from Jan Wuesten - should be testing this week/early next.
Registered Member #1403
Joined: Tue Mar 18 2008, 06:05PM
Location: Denmark, Odense C
Posts: 1968
Mads Barnkob wrote ...
Goodchild wrote ...
Then you must have the Fiber TX connected incorrectly, try inverting the signal to the fiber TX.
I know both work as I use that interrupter with my DRs and they all use that driver.
(edit) I just took a look at your pic again, it looks like that's the correct output to the GDT to me.
The TX is just a "LED", connected to the pin 3 output from the interruptor through a resistor
I would have thought the GDT output should be on for like 5% and off 95%, its very close at running in CW mode as it is now, the dead time areas are much more spread out than I could draw by hand its more like: |||||||||||||||||||||||||||||||||_|||||||||||||||||||||||||||||||||_|||||||||||||||||||||||||||||||||_|||||||||||||||||||||||||||||||||
And I think it should be like this, which is obtained by using the inverted output from IC3A, pin 6 instead of pin 5: ________________________||||_________________________||||_________________________||||_________________________||||
The BOLD is not a good solution, as this will invert the OCD signal too resulting the driver in going into CW mode when the OCD trips, so if it wasnt already dying it sure would...
The fix is ofcourse to remove the inverting schmitt triffer IC1F from the interruptors signal path, pin 5 and 6.
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Wards universal driver, inverted signal problem (solved)
