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Old 11-07-2010, 09:17 AM   #3961 (permalink)
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Current sensor

Paul,
what is projected for the SR controller current sensor?
Are we still in the path of the LEM HASS 300-s?
if so, We will be able to upgrade to higer current handling (600) with out much softw. modification?
Thank you

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Old 11-07-2010, 09:22 AM   #3962 (permalink)
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Quote:
Originally Posted by mrbigh View Post
Paul,
what is projected for the SR controller current sensor?
Are still in the path of the LEM HASS 300-s?
if so, We will be able to upgrade to higer current handling (600) with out much softw. modification?
Thank you
You wont have to worry about upgrading current sensors until you pass 900A. Thats as high as the LEM HASS Series can read.

-Adam
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Old 11-08-2010, 08:43 AM   #3963 (permalink)
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I probably don't know enough to be posting about the LEM but if you need more than 900 amps could you just have two parallel conductors and only measure the current in one of them with the LEM? You would be measuring half the current but you could just adjust the software accordingly...
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Old 11-08-2010, 08:53 AM   #3964 (permalink)
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Quote:
Originally Posted by ElectricZX2 View Post
I probably don't know enough to be posting about the LEM but if you need more than 900 amps could you just have two parallel conductors and only measure the current in one of them with the LEM? You would be measuring half the current but you could just adjust the software accordingly...
In theory the idea works fine, but you have to guarantee that the both conductors would be sharing current evenly. If they are not, you reading will be off.

-Adam
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Old 11-08-2010, 09:16 AM   #3965 (permalink)
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Pwrx vla500

Adam,
What's the tally on the VLA500-01 subscribers?
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Old 11-08-2010, 09:19 AM   #3966 (permalink)
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Adam,
What's the tally on the VLA500-01 subscribers?
Umm...5 or 6. I'm on my phone so I will check when I get back to my computer. It's only 3 people. One is me the second is you. Lol

-Adam
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Old 11-08-2010, 09:40 AM   #3967 (permalink)
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Talking Parts questions

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Originally Posted by jackbauer View Post
the new build continues. Hope to do final testing and assembly this evening. Note the two resistors and schottky diode used on the igbt drive and the shorted gate to emitter pins on the high side for use as freewheel diode.
jackbauer
I have some 2uf x1500vdc with tabs for direct mounting to the IGBT terminals but this are to physicaly large for my application.
Witch value you used for the poly film cap in the capacitor rails and the IGBTs in your last controller build?
I have to place a parts order for the LEM HASS and would like to include the capacitors also.
Horacio
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Old 11-08-2010, 11:25 AM   #3968 (permalink)
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Quote:
Originally Posted by MPaulHolmes View Post
1000amp current sensor results!

OK part number CENTRON CSA-1V

Now, the centron was soldered to a single sided pcb. For a measurement range of 0-1016amp, the bottom of the pcb needs to be 0.75" away (actually 0.754") from the bus bar. That's 12 bare fiberglass boards (pcbs without the copper). Higher temperatures make the current read slightly less than it actually is.

I also ordered a part (that's on a 25 week back order) that should be able to be much closer to the bus bar.
What ever happened to the testing on the 1000amp current sensor

-Mark
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Old 11-08-2010, 02:26 PM   #3969 (permalink)
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The caps are 1uf 250v poly. not ideal but its what my supplier had in stock. Also count me in for the drivers.
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Old 11-14-2010, 11:32 PM   #3970 (permalink)
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Sorry for the late response on here just haven't had time to post but my situation hasn't changed so I just went back to the arduino pwm that I had only problem now is that revolt board fried almost all my fla batteries within an instant I think this board needs some serious disclaimers put into the wiki because what I originally thought was if the yellow LED didn't blink then everything was ok but apparently that is not the case if I would have known that if even one component like the NAND or comparator were bad and would cause my whole power section to blow up I probably would have not bought this board and the components and would have continued to develop my own board. I still do not buy that the issue was frequency because I have run these at 8k with a 555 circuit no prob. What if one of my Chips were bad from the factory and it ended up blowing up the mosfet section I purchased made for the revolt board would I get a refund for that? NO I wouldn't. There should be a big disclaimer addressing this issue and testing procedures before installing some of these components on the board.

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