How to reduce the interefence on LEDs from 3 Phase main

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siddharthtaunk

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Hello,

I have a series of LEDs which are in a very close vicinity of the three phase supplye(24V LEDs) which I switch on the three phase mains supply. The LEDs start flickerring without an input to it.

As far as I know this is the intereference from the three phase.

Please suggest a solution for the above.

I am not in the liberty to move either the three phase nor the LEDs away from each other.

Thanks in advance.

Siddharth
 
Last edited:

crutschow said:
What is the supply to the LEDs?

You might try adding a capacitor across the LEDs.
Click to expand...

And a resistor in parallel. What value depends on the rated led voltage on the line. It helps to dissipate the influenced power.

...

if you have a single pole switch for the leds, then a double pole may help also, if it is capacitive coupling.

Hope this helps
Klaus
 

I guess, the LED indicator (with built-in current limiting resistor) is driven by a relays or PNP output from 24V. If the circuit is open, the cable picks-up some capacitive currents from mains voltage lines running next to it. Similar effects are well-known for open circuit glow-discharge indicator lamps. Placing a capacitor or additional load resistor across the indicator circuit should help. Or separating the cables.
 

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