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How To Dim 12.96A of LED Strip Lighting With a 5A PWM Dimming Panel

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Early we covered how to dim fixed colour LED strip smoothly from 0 – 100% using the LDP-CV-5A.

Today I’m going to explain how to dim a load of more than 5A using the same LDP-CV-5A.

First we need our LED strip and we’re going to use the UltraFlex warm white strip that we used in our dimming example which consumes 8.64W of power per metre. So the total power consumption of our 4m roll is 8.64 x 4m = 34.56W. The input voltage of the UltraFlex strip is 24V, so dividing 34.56W by 24V gives us the current of the 4m length which is 1.44A. We need to know this information because the PWM dimmer we are going to use is rated at 5A. So technically, we can dim up to 12m of Ultraflex with this dimmer. 1.44A per 4m roll x 3 rolls (12m) = 4.32A.

In this example we have 12 x 4m rolls of UltraFlex (48m) to dim and by using the equation above, our circuit has a current draw of 12.96A which is well above the 5A rated load of the LDP-CV-5A.

To get around this problem of load, we use our LDR-CV-5A-3CH. This dimming repeater has 3 output dimming channels at 5A each, which is a total load of 15A.

To wire the circuit, connect a 2 core low voltage cable from the positive and negative of the 24V power supply to the input +/- of the LDP. This input voltage powers up the dimming unit to provide the PWM signal. Now run a second 2 core low voltage cable from the power supply to the +/- power input of the LDR. Both of our control devices have 24V power to them. Run a 2 core low voltage cable from the +/- output of the LDP to the +/RED (R) of the LDR. The LED strips are low side switched, so the negative is RED, GREEN, BLUE. This provides our PWM dimming signal. Now connect a single loop from the RED terminal to the GREEN terminal, and from the GREEN terminal to the BLUE terminal. The LDR can operate on fixed colour or RGB and because we are only using fixed colour, we need to bridge the dimming signal across the other 2 input channels, otherwise we will only having dimming on the RED output channel.

Now connect a 2 core low voltage cable from the V+ and RED (-) output channel to 4m of UltraFlex (4.32A). Repeat this procedure with a 2 core low voltage cable from the V+ and GREEN (-) output channel to the next 4m of UltraFlex (4.32A) and a 2 core low voltage cable from the V+ and BLUE (-) output channel to the last 4m of UltraFlex (4.32A).

Turn on the 24V power supply and the LDP rated at 5A will provide smooth dimming from 0-100% of the 12m length (12.96A) of UltraFlex strip. The 24V input voltage to the LDP and LDR is not switched, the LDP switches the strip on and off and then by turning the rotating dimming mech clockwise the strip will illuminate up to 100% full intensity.

If you have LED strip lighting installed that you would like to dim, please contact us today and get your LDP and/or LDR shipped straight to your door.

How To Dim LED Strip

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Dimming LED strip is a simple process so long as you have control gear that can provide a PWM (Pulse Width Modulation) output signal. I prefer using PWM for dimming LED strip as it it silky smooth from 0-100% and the LED driver doesn’t have to be closely matched to the load as with 1-10V dimming systems.

The first method I’m going to explain today is a 24VDC stand alone system. By stand alone I mean it is not part of a smart lighting control system like Dynalite, Crestron or C-Bus.

I’m going to use our 3000K, CLC-SuperFlex LED strip which consumes 9.6W of power per meter. So the total power consumption of our 4m roll is 9.6 x 4m = 38.4W. The input voltage of the SuperFlex strip is 24V, so dividing 38.4W by 24V gives us the current of the 4m length which is 1.6A. We need to know this information to ensure our load doesn’t exceed the rated output of the PWM dimmer, but our Dim Master has 4 x 5A channel outputs at 12-24VDC, so technically we can dim up to 48m of SuperFlex with this dimmer. 1.6A per 4m roll x 12 rolls (48m) = 19.2A.

For a 4m length of SuperFlex LED strip rated at 1.6A/4m length you will require a 24V LED power supply rated higher than 38.4W. Connect a 2 core low voltage cable from the positive and negative of the 24V power supply to the input +/- of the Dim Master. This input voltage powers up the dimming unit to provide the PWM signal. Now run a second 2 core low voltage cable from on of the 4 output channels of the Dim Master to the +/- of the LED strip. And that’s it!

The Dim Master has a large chrome rotary knob which is depressed for ON/OFF, and simply rotate the knob in a clockwise direction to ramp up to intensity of light, or anti-clockwise to dim. The Dim Master will provide smooth 0-100% dimming of the 4m length of SuperFlex strip.

If you have LED strip lighting installed that you would like to dim, please contact us today and get your Dim Master shipped straight to your door.

The second method I’m going to explain involves using a 240V Triac Dimmable LED driver, but it requires a licensed electrician to complete the installation. Have your electrician purchase a dedicated 240V LED dimmer, preferably a DIGINET LED Smart phase adaptive dimmer optimised for LED loads. The benefit of this way of dimming the LED strip is that you can have a dimmer which neatly fits your 240V wall plate, compared to mounting a PWM wall plate beside the existing switch plate.
The Triac Dimmable Driver converts the 240V output dimming signal from the 240V DIGINET dimmer to a 12VDC or 24VDC PWM signal to dim the LED strip.

For our example I’m going to use the PDV-75-24 which has an output of 75W, far exceeding the 38.4W required by the 4m of SuperFlex LED strip. The 240V switch wire from the DIGINET dimmer is connected to the input of the PDV-75-24, along with a neutral wire from the same lighting circuit. Connect a 2 core low voltage cable from the positive and negative 24VDC output channel to the LED strip and that’s it! The LED strip will dim smoothly from about 10% up to 100% full intensity.

Creative Lighting Concepts sells a full range of Triac Dimmable LED drivers from 30W loads up to 360W loads, in both 12VDC and 24VDC output voltages.

Dare to dream and let Creative Lighting Concepts bring it to light…

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