Fadal 4020 Crackling noise in my Inverter transformer cabinet

[FADALDMU50]

Hi Guys
I have this intermittent "CRACKLING NOISE" in my electrical cabinet.
On the Invert-er box it does show a red light on the Y delta
and a yellow/red light on the servo light.
But machine is running OK.
Looking forward to your feedback.

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[warrenb]

Check the connections for arcing. "Crackling" could be something as simple as a a piece of debris stuck in a cooling fan.

Get someone else to run the control panel while you watch and listen.

[FADALDMU50]

I will do that.

thanks so much...