0-10 Volt dimming

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JdoubleU

Senior Member
I am installing some LED high bays and they are going to have the dimming option. What I did not know is that the 10volts comes from the light fixture and the + and - go to a dimming controller and somehow I guess it drops the voltage. How is the dimming controlled? I always thought that the controller gave the light fixture 0-10 volts dimming the light depending on the amount of voltage it was giving the light.
 
A lot of them will work either way - feed 0-10v from a controller or just use a pot across grey/purple.
/mike
 
You need to be careful here ... there are two dimming systems which sound similar but are very different!

In the entertainment work there has been for many years a system of 0-10V control where the controller sends an analogue voltage to the dimmer unit & it controls the lamps. In tis scheme 0V = fully off & 10V = fully on, with proportional control inbetween ... ie 5V = 50V.

There is also another system which first originated for fluorescent lights which is the 1-10V system. This is very different to 0-10V & they are not compatible! With the 1-10V system the lighting fixture supplies the voltage between the two terminals - when the terminals are open circuit the voltage will be 10V. The controller applies a 'resistance' between these to pull a current, the more current that is pulled, (ie. the lower the resistance) the more the voltage falls and the more the fixture dims.
 
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