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Compressor Causes LED Troffer Flicker

1893 Views 5 Replies 4 Participants Last post by  Kevin
I replaced 10 2X2 Fluorescent troffers with LED troffers. The LED troffers flicker while the compressor is running.
Details:

1. Flickering occurs during the entire time the compressor is running which may be a duration of 10 minutes.

2. I measured voltage drop at a fixture when the compressor was off and again while it was on. On: 119V. Off 115V

3. Spec on LED troffers says 110V -277V

4. Connected a Variac to one LED fixture and dialed down to 100V. No flicker

5. Customer said flurorescents used to flicker. There was a combination of magnetic and electronic and I'm not sure which were or were not flickering.

6. New LED troffers have 0-10V dimming but this feature is not connected.

7. Compressor and lighting circuit both come from a 208V 3-phase panel. The compressor takes 2 of these legs with a dedicated circuit. The lights share a leg - not a circuit - with the compressor. The lights are on a dedicated circuit.
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Discussion Starter · #5 ·
Can you put the lights on the leg which does not feed the compressor?

How "loaded" is the service?

Did you check all the connections in the lighting circuit back to the panel?
Problem occurs when nothing is running except a few computers. Also occurs when portable power tools are run. There was no heavy electrical equipment running while I was on site though I'm sure the customer has jobs that require it.

I'll change the legs the next time I go there
 

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Problem occurs when nothing is running except a few computers. Also occurs when portable power tools are run. There was no heavy electrical equipment running while I was on site though I'm sure the customer has jobs that require it.



I'll change the legs the next time I go there
Be careful just changing the leg that feeds the lights. If there's a common neutral on 3 circuits, you could end up overloading the neutral. You *might* have to move 3 breakers.

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