Flashing LED's

PhilCumbria · Dec 23, 2015

I have a friend that has had 4 under cupboard LED Lights fitted. They are connected to an LED Driver - it is a 24V DC LED Driver 100W. However when they switch on the leds they just flash, Can anyone help with this and how to get them working properly? Thanks

PhilCumbria · Dec 23, 2015

Hi Murdoch I have posted pics to davesparks post...

davesparks · Dec 23, 2015

It might have helped to give a bit more information at the start, or now even. Being an electrician helps, what tests have you carried out and what were the results?

Octopus · Dec 23, 2015

PhilCumbria said:
Yes I agree he should not have to pay, and I am an electrician, I am just trying to put right someone else's shoddy work, I am baffled by it and I am on here trying to get some help. the original leccy is some 100 miles away now and not interested anymore. I would like to fix it for my mate as cheaply as possible so he is not spending a fortune on other drivers. As I Say there are four LEDs and are switched via a normal 1 gang switch - no dimmer. pics attached - hopefullyView attachment 31020 View attachment 31021

Honesty at last. Your previous posts do suggest this too...

So just ring up Knightbridge and ask them FGS

Octopus · Dec 23, 2015

What make are the LED's?

PhilCumbria · Dec 23, 2015

davesparks said:
It might have helped to give a bit more information at the start, or now even. Being an electrician helps, what tests have you carried out and what were the results?

To be honest I was just there to exchange a Fan for them and they asked me to take a look as an after thought asthey have never worked since being fitted, so I took a couple of pics and thought i would ask on here in case this is a common easy fixed fault. I have read some of the previous posts and will check the neutrals and connections etc, but I am beginning to suspect there are not enough LEDs for the driver.

PhilCumbria · Dec 23, 2015

Actually I will ring Knightsbridge in the new year but no idea as to the LEDs, will have to try and find out I suspect bought separately as a kit would have probably worked correctly.

Octopus · Dec 23, 2015

PhilCumbria said:
Actually I will ring Knightsbridge in the new year but no idea as to the LEDs, will have to try and find out I suspect bought separately as a kit would have probably worked correctly.

I would suggest you get this information before making the call.... or Knightsbridge are likely to say they can't help you......

Lagentium · Dec 23, 2015

I've had a look at the data sheet, maybe not enough load for the driver, but by the looks of it the voltage is variable, would this have a bearing on anything?

https://www.mlaccessories.co.uk/file-download/479f896e579989f4

Hellmooth · Dec 23, 2015

Maybe gaining some more information before jumping down someone's throat would have been more helpful Dave.........it is Xmas after all don't go all Scrooge on us again haha :santa_smiley:

davesparks · Dec 23, 2015

Maybe giving some information and test results in the first place would have been more helpful.

K Macnamara · Dec 24, 2015

Ok Phil here's what I reckon your problem is.

Most LED strips I have fitted in my time are 12v. From your picture your driver is 24v. Secondly are you able to find out what the demand for the strip is? This does vary and is usually done on a amp per meter basis. If you can't find out this info then I would try counting how many LEDS you have per meter, find a similar strip at a wholesalers and use that as a guide. After working out your demand purchase a driver which will comfortably perform the said task.

HandySparks · Dec 24, 2015

K Macnamara said:
Ok Phil here's what I reckon your problem is.

Most LED strips I have fitted in my time are 12v. From your picture your driver is 24v. Secondly are you able to find out what the demand for the strip is? This does vary and is usually done on a amp per meter basis...

These are four individual LED fittings, not strips. See words/photos earlier in the thread.

OP
May be worth pulling a fitting out and seeing if there's any marking or perhaps matching them to pics of similar devices online.

Also worth measuring the output voltage of the power supply as currently set (as it's adjustable).

davesparks · Dec 24, 2015

Looking at the picture they look like a bare high power led in an enclosure, which suggests they need a constant current driver ant not a constant voltage driver as fitted.
Are they wired in series or parallel? For constant current they will need to be in series.

amlu · Dec 24, 2015

davesparks said:
Looking at the picture they look like a bare high power led in an enclosure, which suggests they need a constant current driver ant not a constant voltage driver as fitted.
Are they wired in series or parallel? For constant current they will need to be in series.

^^^that. high power leds will effectively short-circuit the supply, it will go into protection mode and try to restart. thats why the blinking. get spme out and try finding what they are. fingers crossed that they are not fried already (they need a current regulated supply, not only voltage!)