Compressor Causes LED Troffer Flicker
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.
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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I'm not understanding that.
He means that the compressor is on A & B phase, and the lights are also on either A or B phase.
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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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