Constant Voltage Dimming

Hello all,

I got 4 QB288s running on on a HLG-480-48AB driver (8 boards running 4ea in total) and at the time constant voltage really appealed to me. Anyhow after getting everything setup and they all have 100k potentiometers on them. Maxed out they run so hot had to dim and on max some boards current putting out 3.5 amps and rating is about 2.7. I dimmed them manually and all good heat wise. My goal is...I want to be able to dim 8 drivers simultaneously.

I am going the Trolmaster (drivers have 0-10v, so it works) route for electronic dimming and ultimate room control and now I am concerned on how the heck dimming is going to work effectively? I know with these drivers and most CV drivers if they are not maxed out there is going to be dead space before they start to dimm and will cause uneven dimming they say. So now using a controller that digitally shows 100% am I going to have to find the percent they all finally start to dim and still if so they are going to be uneven? Is there anyway to mess with the IO/VO adjusts on the driver itself so dimming takes place with no dead space or is my only way around this using a constant current driver and i'm SOL?

Thanks.

In my experience, there isn't any issue dimming a CV driver.
According to Meanwells spec sheet, the driver operates in CC mode if the output voltage is within 24-48 volts.
It's very easy to use a common dimming circuit for those drivers, they're designed for commercial lighting apps with multiple fixtures.
Just follow the instructions on using either a resistive or pulse width modulation to adjust dimming.

@GBAUTO so after 24v constant current kicks in? I'm a little but confused so when is 48v always supplied if someone wanted that option. I have watched all of led gardeners videos a few times and still trying to get it to soak in. But regardless are you saying if I have 8 drivers powering 4 boards each, should I set the IO/VO pots ON THE DRIVERS to full open and then using my trolmaster light control adapter 0-10v setup I should be able to dim all 8 drivers evenly and lights will dim evenly without a problem?

Try this for some more info: https://ledgardener.com/constant-current-vs-constant-voltage-drivers/
That driver is rated @ 480w driving a 48vdc circuit, so it's capable of producing 10A of drive current. That's the max it's designed to deliver.
Constant current mode means just that-it's able yo deliver that same 10A @ 24v, it's just 1/2 the power. It'll deliver the same 10A on a circuit that needs 24-48 volts.

@GBAUTO

I got the trolmaster..aka a dimmer+ up and running and to my findings I had to limit voltage so that in case one board went out current remained the same. But upon doing so the dimmer did not respond to dimming until it reached 60% and under which I believe since this is a CV driver rated for 10amps was not being fully pushed there was dead-space above until dimming was finally able to be achieved. If I cranked both PoTs on the driver dimming was able to take place from <100% but everything was being pushed to much and in the event of a disconnected board or two the current was spiking heavy.

In the event I left the voltage all the way up and dimmed current to what I needed was fine until one board (if) got disconnected then current would spike again so the better option was to dim the voltage.

So that's why this post originated with if a constant current driver was in the mix say a 2100 or 2800 that no matter what... the dimming would take place right away since current/driver is being maxed. Am I missing something here because with my current setup I have that dead space that I cannot omit.