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Author Topic: burned LDD-700  (Read 5056 times)

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Offline johcastro

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burned LDD-700
« on: May 23, 2016, 07:19:05 AM »
Well.... I dont know what i did but I pretty much toasted my new drivers, and im hoping to understand what I did wrong before the new ones arrive, I was using pwm, the coralux pcb board, and the drivers itself worked good before, i gave it a try on a 9w led i have for testing, and it was fine, but when i put the 7 leds per channel on the ldd, connected the 24v 5a power supply to it and turned the whole thing on, i saw smoke comming from the drivers...

I attached the picture of the fixture, Im using the arduino mega 2565 r3, i also attached the video of the whole thing working on my test led before things went horribly wrong.....

https://youtu.be/mEkOUdIXNC8

Offline Tonio

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Re: burned LDD-700
« Reply #1 on: July 11, 2016, 06:01:51 PM »
Hi there, I've burnt a couple myself and was wondering if you figured out a fix? what I've researched, you should put a fuse in between the power supply and the driver board and also you should put a 1k ohm 5watt resister by the positive of your first string of LED's.

I'm still working on my lights and controller, if I find a fix I will let you know.

Offline TheDOdblG

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Re: burned LDD-700
« Reply #2 on: July 11, 2016, 08:48:38 PM »
That first picture you have above, is that an all metal enclosure?  And did you happen to put your PCB with your LDD drivers on it in that metal enclosure?  Just trying to figure out where you went wrong with the few clues you provided.  If you did do what I suspect, then I'm fairly sure you shorted things out, as the bottom of the PCB would have made contact with the metal enclosure...  You need some kind of insulated material (ie - wood, plastic, rubber) to put in between your electronics and metal (conductive) surfaces.

Offline TheDOdblG

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Re: burned LDD-700
« Reply #3 on: July 11, 2016, 08:58:34 PM »
Also make sure none of the LEDs (or the wiring for them) are making "contact" with the heatsink. It's very easy to accidently have a little bit of wire that you soldered to your LEDs make contact with the heatsink, maybe a melted wire from all the heat you used to get the wire attached exposed the wire and is now making contact with the heatsink, or maybe a "stray" from using stranded wire might be touching it?  I use a multimeter to check for electrical shorts.  For testing, use one probe from a multimeter to touch where you have the wire attached/soldered, and use the other probe to touch the heatsink (hold that one there and use the one probe to test all the other connections).  For all your connections, there should be no continuity between them and the heatsink...

Offline devilhunt123

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Re: burned LDD-700
« Reply #4 on: September 30, 2016, 08:41:41 PM »
As above, definatly check for any shorts between the led's, wiring and the heatsink, as from looking at your images I'm guessing that your wiring to the leds goes through the heatsink if so then a visual check of the insulation at the point the wires go through would also be advised, finally would it be possible to post a drawing of your wiring plan just to eliminate any possible cross wiring, Thanks.

Offline SantaMonica

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Re: burned LDD-700
« Reply #5 on: October 07, 2016, 12:25:43 AM »
Nothing like a burnout to burn you out for the day.

Offline brett027

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Re: burned LDD-700
« Reply #6 on: November 27, 2016, 08:34:05 PM »
+1 on checking short to ground(heatsink). Just use a multimeter and do a continuity check with a probe on the heatsink, and for my own piece of mind, I touch EVERY soldered connection on the leds with the other probe. I'd be interested in the forward voltage/amperage of each led, and how they are wired? 9 watt leds are pretty decent sized bulbs.

Offline wdb2021

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Re: burned LDD-700
« Reply #7 on: April 20, 2021, 05:37:59 AM »
You made a new driver very cool. I'll be looking forward to your other handicrafts.