Faulty LED Driver? Voltage Adjust screw is changing current and Io Adjust screw is changing nothing

Using a second hand HLG-240H-36A LED Driver to power 2x QB132 v2’s Quantum boards which are 75w max each, so 150w together.

Trying to use the driver Adjustment screws for Voltage and Amps

The Io ADJ screw is doing nothing at all. And the Vo ADJ screw is changing amp current while the voltage stays the same, which is back to front?

Voltage won’t change from 247v on a (kill-a-watt meter) (in the UK)

Is the driver damaged or is it something else?

Is it safe for the amperage to be changing from the voltage adjustment?

Thank you

Vo adjust changes voltage which can change how much current your boards can draw, it will change current coming out of the driver.


The killawatt is on your ac side, right? So no much use to measured the DC side except for total load.

How are you measuring current on your dc side?

Io adjust will not trim current back to 0, only to around half of max output. Yes there are marginal situations where what you see would be normal.
My suggestion: min Io adjust and max Vo adjust, and then slowly increase Io adjust; do you see any increase in current? Thru multimeter on the DC side or just increased light intensity? If so then all is normal afaics.

Thanks for the reply

Yea Iv realised the kill-a-watt meter only works for total watts now haha.

But the Io adjust screw doesn't do anything it turns lock to lock (doesn't spin round like its broken or anything).

If i turn the Vo adjust all the way up wouldn't it blow up my boards? its a 240 watt driver and the boards are 150 watts altogether.

I have upgraded from the same driver but the 120w version HLG-120H-36A on this one the Io adjust screw worked fine.

Is my driver faulty? Is the driver to over powered for the Io adjust to work?

Thanks

I think you may have a problem with the Io adjust hole, pot thingie. Make sure the screw driver is actually grabbing the screw in the bottom. And if no joy, yeah, no Io adjust. You'd need to set it to a dim with Vo adjust and keep it there, or get one of these little DC volt/amps display and control the intensity with the display spliced in to your circuit.

Thanks for the reply, Turned out that the Io adjust screw was not working until I turned the Vo adjust screw all the way up.

Discovered this while trying to brighten the light. The Vo adjust stopped raising the watts after about 90w even with screw turned all the way up. And then the Io adjust screw started working and now lets me have full control from that

Problem solved!

Hopefully this info might help others in the future!

Thanks
Fruit

PhenoFruit said:

Thanks for the reply, Turned out that the Io adjust screw was not working until I turned the Vo adjust screw all the way up.

Discovered this while trying to brighten the light. The Vo adjust stopped raising the watts after about 90w even with screw turned all the way up. And then the Io adjust screw started working and now lets me have full control from that

Problem solved!

Hopefully this info might help others in the future!

Thanks
Fruit

Click to expand...

My LG ballast perform like this, I will see if that changes it, haven’t had time to mess with them, thanks.

PhenoFruit said:

Thanks for the reply, Turned out that the Io adjust screw was not working until I turned the Vo adjust screw all the way up.

Discovered this while trying to brighten the light. The Vo adjust stopped raising the watts after about 90w even with screw turned all the way up. And then the Io adjust screw started working and now lets me have full control from that

Problem solved!

Hopefully this info might help others in the future!

Thanks
Fruit

Click to expand...

This is why I asked you to turn Vo all the way up. Think of it like this: Vo adjust establishes a "upper limit" in how much each board can draw, maximum. Then Io adjust lets you play with intensity within this range.

Rocket Soul said:

This is why I asked you to turn Vo all the way up. Think of it like this: Vo adjust establishes a "upper limit" in how much each board can draw, maximum. Then Io adjust lets you play with intensity within this range.

Click to expand...

You were completely right! makes sense now