Meanwell and resistors

butcher333 · 01/12/2014, 03:08 PM

I am confused about how a resistor in line can stop an led string from glowing after the power is cut to the driver. I have 2 60-48p's hooked up to a DDC-01 PWM controller powering 24 Cree XP-G's. The controller is plugged into an analog timer. I also have 2 / 0-10V Dimmable Nano Driver's with Potentiometer driving 10 Philips Rebel's each. All purchased from RapidLed. The nano drivers come with the dimmers installed. If I cut power to the Drivers the Capacitors discharge with a very bright flash and I am under the impression that the 48p's are to be run with the dimming signal to the timer not the drivers to the timer. all strings glow when turned off via the timer. If I cut power to the timer I get discharge and having a timer is pointless. I have been reading a lot and even tried to educate myself with not much success. If a resistor is to restrict current beyond a certain point then how would a resistor in series prevent my LEDs from glowing after off. I've read 1ohm, .1ohm, 5k, 12k, 2k, 1/4w, 1/2w, 5w resistors being used. This is making me crazy and I am getting so frustrated. I do not understand why there is not a DIY thread directed at exactly this issue. I am obsessive and all I want is to have my LEDs to be off and on when I see fit. Each evening the amount of glow is Driver independent so one string may glow brighter than the others. A string may glow for 2 hours or just be off altogether. Even if I run without the timer this persists. unplugging the drivers results in discharge flash. I really appreciate any help in this matter. I just recently purchased more LED's and drivers for my new tank and want to resolve this before I complete the fixture.

butcher333 · 01/12/2014, 05:26 PM

31 views. No responses. I think I will just put myself on a timer and unplug everything (flash/Discharge) at night and plug back in the morning. I think I may just make a move to T-5's for my new tank and pull my halides out of storage and be done with this stupid LED thing until they get the issues resolved. So frustrated. 20 hours of googling and no specific answers. It's happening in the automotive industry, household lighting and everywhere LEDs are being used. There needs to be a way to restrict current below a certain threshold when off but not unplugged yet wont affect open/on.

Subw00er · 01/13/2014, 12:48 PM

When mine shut off via a timer, they flash and generally discharge the internal caps. You're are still firing low for two hours? Put a time on all of the associated power supplies.

stephenhall1987 · 09/19/2014, 04:33 PM

Bump.
I'm looking to see if anyone has solutions to these 2 issues.

gbru316 · 09/19/2014, 04:59 PM

A high resistance shunt resistor will discharge the stored electricity in the driver. It's known as a "pull down" resistor because it pulls the voltage down when no power is applied.

But are you sure this "glow" is coming from electricity flowing through the emitter? Emitter color is based upon what phosphor the emitter is coated with. This phosphor can be excited by light from nearby emitters, causing them to appear like they're slightly on. The same thing happens in my array, even with the offending strings unplugged. A shunt resistor will not be a solution if this is what you are experiencing.

mcgyvr · 09/20/2014, 08:33 AM

All you need to do is plug the ELNs into a wall timer and be done..
You don't put the dimming controller on a timer.. Just leave it on all the time letting it ramp up/down as you wish..

01/12/2014, 03:08 PM	#1
butcher333 Registered Member Join Date: Jun 2010 Posts: 28	Meanwell and resistors I am confused about how a resistor in line can stop an led string from glowing after the power is cut to the driver. I have 2 60-48p's hooked up to a DDC-01 PWM controller powering 24 Cree XP-G's. The controller is plugged into an analog timer. I also have 2 / 0-10V Dimmable Nano Driver's with Potentiometer driving 10 Philips Rebel's each. All purchased from RapidLed. The nano drivers come with the dimmers installed. If I cut power to the Drivers the Capacitors discharge with a very bright flash and I am under the impression that the 48p's are to be run with the dimming signal to the timer not the drivers to the timer. all strings glow when turned off via the timer. If I cut power to the timer I get discharge and having a timer is pointless. I have been reading a lot and even tried to educate myself with not much success. If a resistor is to restrict current beyond a certain point then how would a resistor in series prevent my LEDs from glowing after off. I've read 1ohm, .1ohm, 5k, 12k, 2k, 1/4w, 1/2w, 5w resistors being used. This is making me crazy and I am getting so frustrated. I do not understand why there is not a DIY thread directed at exactly this issue. I am obsessive and all I want is to have my LEDs to be off and on when I see fit. Each evening the amount of glow is Driver independent so one string may glow brighter than the others. A string may glow for 2 hours or just be off altogether. Even if I run without the timer this persists. unplugging the drivers results in discharge flash. I really appreciate any help in this matter. I just recently purchased more LED's and drivers for my new tank and want to resolve this before I complete the fixture.

01/12/2014, 05:26 PM	#2
butcher333 Registered Member Join Date: Jun 2010 Posts: 28	31 views. No responses. I think I will just put myself on a timer and unplug everything (flash/Discharge) at night and plug back in the morning. I think I may just make a move to T-5's for my new tank and pull my halides out of storage and be done with this stupid LED thing until they get the issues resolved. So frustrated. 20 hours of googling and no specific answers. It's happening in the automotive industry, household lighting and everywhere LEDs are being used. There needs to be a way to restrict current below a certain threshold when off but not unplugged yet wont affect open/on.

01/13/2014, 12:48 PM	#3
Subw00er Registered Member Join Date: Jan 2012 Posts: 460	When mine shut off via a timer, they flash and generally discharge the internal caps. You're are still firing low for two hours? Put a time on all of the associated power supplies.

09/19/2014, 04:33 PM	#4
stephenhall1987 Registered Member Join Date: May 2013 Posts: 236	Bump. I'm looking to see if anyone has solutions to these 2 issues.

09/19/2014, 04:59 PM	#5
gbru316 Registered Member Join Date: Jan 2012 Location: Lancaster,PA Posts: 1,720	A high resistance shunt resistor will discharge the stored electricity in the driver. It's known as a "pull down" resistor because it pulls the voltage down when no power is applied. But are you sure this "glow" is coming from electricity flowing through the emitter? Emitter color is based upon what phosphor the emitter is coated with. This phosphor can be excited by light from nearby emitters, causing them to appear like they're slightly on. The same thing happens in my array, even with the offending strings unplugged. A shunt resistor will not be a solution if this is what you are experiencing.

09/20/2014, 08:33 AM	#6
mcgyvr Registered Member Join Date: Sep 2003 Location: North Carolina Posts: 20,050	All you need to do is plug the ELNs into a wall timer and be done.. You don't put the dimming controller on a timer.. Just leave it on all the time letting it ramp up/down as you wish..