Diy led help needed - The Planted Tank Forum
 
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post #1 of 6 (permalink) Old 08-29-2013, 06:28 AM Thread Starter
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Diy led help needed

hi my name is farooq iam based in bangalore india..
had setup a 4 ft planted tank with 2 x 150wmetal halide and 2x4ft t5 lights

iam planing to setup a led lighting system using these following
4 x Meanwell ELN-60-48D
two separate aluminium heatsinks
\
each heatsink would have 17 cree xte cool white
and 8 red,green,blue,purple cree xpe leds

i will be building a custom enclosure for everything inside ..will upload development in coming days

now where i need help is ..iam using a potentiometer connected to a 10v ac signal which in turn is connected to driver to dim the leds
can i use a single pot for all drivers ?
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post #2 of 6 (permalink) Old 08-29-2013, 12:37 PM
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Farooq-


The Meanwell drivers need a 10VDC dimming signal, Not AC. You can use the same 10Vdc signal to dim all your drivers, but one Potentiometer per driver will give you more control.


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post #3 of 6 (permalink) Old 08-29-2013, 12:59 PM
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Out of curiosity, how are you distributing the LED's between the drivers? I assume you'll have 2 drivers per heatsink. However, red XP-E's have a lower max current rating than the others, and the XP-E's have a lower max current rating than the XT-E's. You can only run 14 (maybe 15) of said LED's on each Meanwell, which means you'll have a couple CW XT-E's being run at a much lower current (unless you run everything at a low current, ~500 mA)


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post #4 of 6 (permalink) Old 08-29-2013, 05:42 PM Thread Starter
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iam distributing the leds among the 4 drivers....
the red , green , purple will be run at maybe at 600mA.... r,g,p will share a single driver totaling 12 leds
the whites and blues at 800mA

Also thankyou O2surplus for answering my query..... will giving a single 10Vdc signal to 4 pots result in drop of voltage/current to the 10vdc signal and also pls do clarify how the connection can be made
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post #5 of 6 (permalink) Old 08-29-2013, 05:56 PM
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Quote:
Originally Posted by farooqmallik View Post
Also thankyou O2surplus for answering my query..... will giving a single 10Vdc signal to 4 pots result in drop of voltage/current to the 10vdc signal and also pls do clarify how the connection can be made
They are to be hooked up in parallel, so the current is additive, not voltage drop. Your DC source needs to be able to handle the draw of 4 dimming inputs of drivers. I can't imagine this is much though, so you should be fine with like a 1A 12v DC power supply.

Essentially you need to split the + and - wires coming from the DC supply into 4 wires each for a total of 8 wires. They then go into their respective drivers.


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post #6 of 6 (permalink) Old 08-30-2013, 07:08 PM
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Quote:
Originally Posted by Chronados View Post
They are to be hooked up in parallel, so the current is additive, not voltage drop. Your DC source needs to be able to handle the draw of 4 dimming inputs of drivers. I can't imagine this is much though, so you should be fine with like a 1A 12v DC power supply.

Essentially you need to split the + and - wires coming from the DC supply into 4 wires each for a total of 8 wires. They then go into their respective drivers.

Personal "research" shows the Meanwell dim circuit is...
Quote:
So the DIM+ pin is drawing 1.5/1000 = 1.5mA. And that is at an applied 6.08V. It’s probably going into an NPN bipolar, and that would agree with the fact that (according to the ELN spec) you get no output for the first 1.1V input. That being so, the current with 10V applied would be 1.5mA x (10-1.1)/(6.08-1.1) = 2.68mA
1A PS is probably overkill but easy to find..

One thing to be aware of is that the dimming circuit has a low tolerance for over voltage.. The feed should be 10.3V or less (need to double check this from the hip number but it is LOW).. No more at least according to Meanwell..

For mine I use one of those cheap DC buck voltage regulators from fleabay (w/ LED out ).. Whopping $5
Throw a 12V DC out at it and turn the pot down to 10V..double check w/ VOM meter and away you go..

Quote:
DC Buck Step Down Converter LM2596 Module Regulation With LED Voltmeter Display



As to dropping the current below useable w/ 4 parallel pots.. doubt it is even possible w/ any 12V DC wall wart..
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