COB CXB3590s aren't turning on

TroyMcClure

TroyMcClure

Member
I have 10 x Cree CXB3590s and 2 x Mean Well HLG-240H-C1750B drivers to drive them, with some CPU coolers for 6 of the lights, as well as 4 purpose-made passive heatsinks I bought with the COBs.

I tested my components before I made a DIY frame for them to test if they worked, and all seemed well, however once assembled with the frame they didn't seem to work. I put it away for a while & had been unable to make time to work on it, but I thought it was possible that the outer lights using the self mounted lights may not have been getting enough pressure on the cob holders preventing a complete circuit, so I tried connecting just the middle 4 lights on one of the drivers, however that also didn't seem to do anything. I tried connecting just 1 of the lights to reduce the amount of factors that could be failing (I understand that would be too many Amps for a single light, but intended to turn it off as soon as I got any result) however I didn't get any reaction. I also tried both drivers in both tests

Pictures of my lights & frame
https://anonfile.com/3eM27430n4/coblights2_jpg
https://anonfile.com/2eM27032n1/coblights5_jpg
https://anonfile.com/40Ma7b37n4/coblights4_jpg
https://anonfile.com/52Mf7434n9/coblights1_jpg
https://anonfile.com/64M97234n5/coblights3_jpg
https://anonfile.com/74M57d30n9/coblights8_jpg
https://anonfile.com/8dM57237n3/coblights7_jpg
https://anonfile.com/AfM87b3bn6/coblights6_jpg

Would greatly appreciate any help, can provide any extra information needed. I hope I made some obvious mistake that's easy to fix.

Thanks
 
S

Sinfor

Well-Known Member
Those drivers can handle 2, 3 or 4 36V class Cobs in series.
If you connected 1 COB, it is not to much Amps, it is too much Voltage(71V).
With a DMM measure the open Voltage to check if the driver is providing the correct one(146V).
Check that COBs are placed with the right polarity in the holders.
Try to power them in pairs.
 
Isawthelight

Isawthelight

Well-Known Member
TroyMcClure said:
I have 10 x Cree CXB3590s and 2 x Mean Well HLG-240H-C1750B drivers to drive them, with some CPU coolers for 6 of the lights, as well as 4 purpose-made passive heatsinks I bought with the COBs.

I tested my components before I made a DIY frame for them to test if they worked, and all seemed well, however once assembled with the frame they didn't seem to work. I put it away for a while & had been unable to make time to work on it, but I thought it was possible that the outer lights using the self mounted lights may not have been getting enough pressure on the cob holders preventing a complete circuit, so I tried connecting just the middle 4 lights on one of the drivers, however that also didn't seem to do anything. I tried connecting just 1 of the lights to reduce the amount of factors that could be failing (I understand that would be too many Amps for a single light, but intended to turn it off as soon as I got any result) however I didn't get any reaction. I also tried both drivers in both tests

Pictures of my lights & frame
https://anonfile.com/3eM27430n4/coblights2_jpg
https://anonfile.com/2eM27032n1/coblights5_jpg
https://anonfile.com/40Ma7b37n4/coblights4_jpg
https://anonfile.com/52Mf7434n9/coblights1_jpg
https://anonfile.com/64M97234n5/coblights3_jpg
https://anonfile.com/74M57d30n9/coblights8_jpg
https://anonfile.com/8dM57237n3/coblights7_jpg
https://anonfile.com/AfM87b3bn6/coblights6_jpg

Would greatly appreciate any help, can provide any extra information needed. I hope I made some obvious mistake that's easy to fix.

Thanks
Click to expand...
The HL320H-C1750 will drive five cxb3590 cobs.https://www.rapidled.com/mean-well-hlg-320h-c1750b/
 
D

dbrn32

Active Member
The information given by other members is accurate, but probably not the reason your light isn't turning on. Even if you were in slight overvoltage condition the meanwell hlg series cc will just regulate output current. My cxb's run under 35v at 1520ma. I would think pretty good chance you will clear constant current region on voltage. If not, it should still come on will just be weak. Shoot for 4 cobs for driver and try this.

The first thing I would do verify you didn't get 72v version expecting 36v version. if you indeed have 36v cobs, verify you have a complete series circuit. if that's good, make sure you're unplugged and check your connections. Wire is stripped proper length and seated inside of cob holders and shit like that. Also verify you don't have any bare copper touching frame, that will put driver into protection. If you still can't find anything, verify cobs are locked into holder properly and tabs are in good contact with solder pads on cobs.
 
TroyMcClure

TroyMcClure

Member
Thanks for the swift replies. I tried using a single light after connecting the others didn't seem to work. Before constructing the frame they seemed to work when I tested my circuit (5 in series on each driver). I'll ensure that everything is making proper contact and make sure no copper is touching the frame & report back
 
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