LED Dimming with 5101R

Hi
Looking at a project where the consultant is using the Philips LED outdoor lighting. These use the Philips Xitanium CC Xtreme LED drivers provide constant current output, optimal for a single string of LEDs. and use 1-10v for dimming. (see Xitanium 150W 0.70A 1-10V 230).
I am thinking of using the 5101R in each lighting column.(about 120 in total on two projects).
Just been looking at the spec of the 5101R and one bit puzzles me, and makes me think if this is suitable 1. it only shows as 0-10v control and the other is "This is not a general purpose 0-10v output as available on the 5104AM".
Please any advise would be appreciated.
If this cant be used what is the maxium lenght of cable run (CONTROL) if we use the 5104AM
Many Thanks

 

The 0-10V capabilities of the 5101R and L5504AMP (DIN replacement for the old 5104AM) are quite different.

The 5101R can act effectively as a digital potentiometer to load down a 0-10V signal. If a current-limited 0-10V supply is connected to the 5101R then it will attempt to load that signal down using PWM. What this means is that you can really only connect 1, or in some cases 2, ballasts of any kind to the 5101R. Any more than this and the current coming down the 0-10V line will be too great and the 5101R won't be able to pull the line voltage low enough to get the desired dimming behaviour.

The L5504AMP is a proper sinking/sourcing 0-10V control signal, however it too has some limits. From page 11 of the Installation Instructions:

• Output Rating - Sourcing 2.5mA (i.e. minimum of 4kΩ)
• Output Rating - Sinking 15mA at Vout = 0V 8mA at Vout = 10V (i.e. I = 15-(0.7*Vout)mA)

Regarding the maximum cable length you can run on the L5504AMP, this will all come down to how many mA of current are being supplied or drawn from the 0-10V lines by the control gear, how many units are connected in parallel and what the impedance of the wiring used is.

 

thanks. The maxium number of electronic LE drivrs is two on any lampost.
What is the maxium distance between the 5101R 0-10v termina and the Balsst or Elecronic LED Driver

 

A max of 2 might be OK. That will be determined by how much current they source to the 0-10V control circuit.

There is no simple answer for this as it is influenced by several factors (predominantly ballast 0-10V current & cable impedance). I suggest you connect 1 of your ballasts up to a 5101R on the bench and confirm that it dims to an acceptable level. Then add a second ballast and confirm that it still dims OK. Then replace the connection between the 5101R and the ballasts with a much longer one using the two ends of a roll of cable (or whatever your maximum cable length will be) and re-test it. If the minimum brightness is not low enough try using a larger diameter cable.

There are no C-Bus network issues introduced by using a long cable (unlike the Bus Coupler) so the limit to the length of cable is determined by what works and what doesn't.