Problems with LED Panel installation

[merlion]

I have replaced the hanging light on the upstairs landing with a 60x60 surface mounted LED panel.
It is on the usual stair 2way circuit but following installation fails to illuminate using either of the switches. The 2 way circuit checks out OK and the panel works OK when connected via the driver to a different 240v outlet.
I did wonder if there is a polarity issue here and if so how would I go about correcting it.
I did think of simply reversing the output connections on the driver but didn't want to try that one without advice.
Many thanks...

 

[PrenticeBoyofDerry]

Have you got two pole voltage tester?

 

[merlion]

Thanks for your response.
Only a multimeter I'm afraid - any help?

 

[PrenticeBoyofDerry]

Using a multi-meter you can confirm polarity.
I would not suggest you work live with a multi-meter though.
But you can prove polarity using dead tests, you would need to isolate circuit first.

Do you have the model/type of lamp you have purchased?

You have not changed any wiring in switches/replaced switch plates and they were working on old fitting?

 

[merlion]

No changes to the wiring at all, I'm using the terminals which fed the original light in the ceiling rose and observing the same colour codes.

 

[merlion]

The lamp is just a generic 60x60 LED panel driven by a [supplied] matching 24/42 Vdc - 1000ma driver..

 

[Aragorn84]

i wouldnt have thaught a switching psu would care all that much about polarity.

Have you temporarily reconnected a pendant to the fitting to ensure it still works?

 

[PrenticeBoyofDerry]

Have you tried re-installing, you may have trapped the cable insulation with the terminal screw, preventing a closed circuit.

 

[merlion]

Yes, done that and checked the driver is sending power to the panel but due to measurement difficulties I can't quote the actual output but when I bench tested both with a wall socket supply it works fine....totally confused..

 

[merlion]

Aragorn - Thanks, yes I have reconnected the pendant as we need some light and that works perfectly...

 

[deadshort]

Hi, it is bog standard switches yes ?

DS

 

[merlion]

Yes they are bog standard switches using the old style, referred to as 'two wire' I believe, wiring standard between them.

 

[ban-all-sheds]

So this is the situation:

1) You have a L & N at the ceiling position, and it works a pendant light OK.

2) You have an LED light which works OK when the driver is plugged into a socket.

3) The LED does not work when the driver is connected to the L&N at the ceiling even though they are known to be OK for the pendant.



It is a normal ceiling rose and a 230V pendant?

 

[merlion]

Absolutely correct..

 

[ban-all-sheds]

What happens if you have both the pendant and the LED panel connected at the same time?