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Registered Member #15
Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068
Nice job! Glad its working for you.
wrote ...
My very first Coil is finally up and running, Well sort of. I am still unable to reproduce Daniel's 4' Arcs. Later this week I am going to fine tune it and see if that makes a huge difference.
4' Arcs is a definitely challenge. 3' should be relatively easy once you get through fine tuning. Getting 4' is all a compromise between reliability and performance. I typically run my current limit so that 3' is the maximum arc length. This keeps it at a good reliability.
Registered Member #141
Joined: Sat Feb 11 2006, 01:14PM
Location: Southern California
Posts: 96
Austin wrote...
Two Words...... It's Alive!
Great to see some sparks! What blew at the end of the vid? Another fuse or...
Reaching wrote...
I see that Wirenut has his current limiter set to full 1000 amp peak before it cuts off to get his 48 inch spark length....may be out of the safe operating area of the IGBT's and IGBT's may not last long that way especially with some ground arcs.
Dan wrote...
4' Arcs is a definitely challenge. 3' should be relatively easy once you get through fine tuning. Getting 4' is all a compromise between reliability and performance. I typically run my current limit so that 3' is the maximum arc length. This keeps it at a good reliability.
Yeah, I definitely like to push the limits for performance. I am well aware of the risks and I keep a spare set of IGBTs on hand because of this. So far, so good, though!
Registered Member #1169
Joined: Wed Dec 12 2007, 09:16AM
Location: Portland OR
Posts: 251
Wirenut wrote ...
Austin wrote...
Two Words...... It's Alive!
Great to see some sparks! What blew at the end of the vid? Another fuse or...
Believe it or not I blew one of the wires connected to mmc where the 4th cap would go. since then i have put a "bigger wire" there but i have yet had a chance to tune the coil. I have been so busy with my new job.
Registered Member #15
Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068
Also, note if your PRF is low, current increases per pulse (as voltage droop on the DC bus caps is less), so ideally you want to stay at least 100Hz for less stress.
Registered Member #1169
Joined: Wed Dec 12 2007, 09:16AM
Location: Portland OR
Posts: 251
Bennem wrote ...
Well done Austin!!
Bet it feels great to get your coil working?...
As Reaching said, best keep your on times to a safe limit for less stress on your components.
What is your current limiter set to?
Just play around with your tuning now.
Mel.
It feels great Mel, I cried a bit once it made its first light. Just kidding
There is not current limit set at the moment. I was going to set it to aprox 500A when I tune my coil but I just have not had the time due to my new job.
The current meter is not currently working either, so I have to figure out whats wrong with that as well. I remeber the test procedures for the meter was somewhat confusing. The bottom lights work on the meter but thats it about it. They don't go higher or lower. Its probably another fine tuning issue with the POTS.
Registered Member #154
Joined: Sun Feb 12 2006, 04:28PM
Location: Westmidlands, UK
Posts: 260
Austin wrote ...
The current meter is not currently working either, so I have to figure out whats wrong with that as well. I remeber the test procedures for the meter was somewhat confusing. The bottom lights work on the meter but thats it about it. They don't go higher or lower. Its probably another fine tuning issue with the POTS.
I haven't read Dan's miniBrute book, just read his first book on the ISSTC 2, but with my coil which uses his current meter circuit, i tested out its function by inputing a variable supply to the bargraph and adjusting the pot to read 1 volt = 1 LED on, 2 volts = 2 LED's on etc.. With my current transformer and burden resister combination (1000:1 and 10 ohm) 100 amp peak = 1 volt = 1 LED on
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