Humming noise coming from the motors?

I set up a Onefinity Elite machine. Should there be any humming noise coming from the machine at idle? Under “setup”, show the E stop status as High?
I also have the QCW with a stand. How do I mount the Power Supply Controller? Did it come with mounting screws? it came with a USB stick but it was empty?

Hi Ron.
Humming is normal. It is idle current holding the motors in place.

Estop high is normal when estop is not engaged.

The usb is blank and needed as the memory for the masso to run files.

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