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Old 06-17-2013, 04:29 PM   #1 (permalink)
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cougar controller help fault

I had build a controller board for open source controller and ruining an igbt brick.

But as son as i power it on yellow led is on all the time and when i push the throttle 40% or more it powers out and kills the outpot and yellow led starts to blink.

And one more thing when i throttle up i can se the response only from 30-40% in that small part it powers and goes to max. I am ruining it on 12 v and when i watch for the voltage it
start not from zero and does not rise gradually but starts from 6.5 and at 30%of throttle and then goes to full at 40% of throttle.

I thank you on all the help.

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Old 06-17-2013, 05:52 PM   #2 (permalink)
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What sort of motor are you using?
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Old 06-18-2013, 02:16 AM   #3 (permalink)
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I haw connected only leds for now for testing and i don't have serial port on my pc i am waiting for usb to serial converter . If you want i can make a video

I cant put link go to youtube and search locoo1 that is my user an i uploaded video today

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Old 06-18-2013, 07:52 PM   #4 (permalink)
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I think I know what's wrong. The microcontroller is doing throttle proportional to current. So, let's say you give it 50% of full throttle. It will ramp up the pwm duty until the current sensor feedback is 50% of 500 amps. But with LEDs that's never going to happen (250 amps), so what you get is ramping all the way to 100% duty but with essentially zero current feedback, which is a fault, (since 100% duty and no current won't ever happen with a real motor), so the yellow led blinks fast.
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Old 06-19-2013, 05:04 AM   #5 (permalink)
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Ok i will try whit a bigger load TNX: )
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Old 06-19-2013, 03:54 PM   #6 (permalink)
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Yeeeessss i conectred 6pc fans cca 1A and it is working

Tnx you are a king

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Old 06-19-2013, 06:56 PM   #7 (permalink)
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You can loop the wire trough LEM sensor a few times so it reads a few times multiplied current; makes light loads testing easier
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Old 06-20-2013, 07:18 AM   #8 (permalink)
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No it is ok , now i nead to link the second igbt as a diode , if i connect gate to emitter i will make a powerful diode an i can use it as freewheeling diode.

And do i need a suffer capacitor if i will have a big capacitor bank.

Tnx

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