Phoenix Power supply unit hissing sound

Vivek_PV said:
We are doing pre commissioning. We have a simulation panel for all inputs and outputs. I measured the output currents when no load. For one power supply, it is 20mA and for other it is 19mA.
UPS supplies are not connected. They are directly connected to the mains
Click to expand...

Can you add a load of say, 5A and see what happens? The currents you're measuring are tiny and i suspect thats the issue.

A 24V anti condensation heater or two is a good load if you can't add real system load
 

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