New user here still setting things up.

I have a Wanhao Duplicator i3 that I have just wired up to a DuetWiFi.
I generated the config files using most of the suggested settings found here: https://configurator.reprapfirmware.org/
Basically only changed the direction of two of the steppers so they move in the correct direction.

My printer successfully homes all axii, but after each stepper comes to a stop, I can hear a soft hum/whine that continues until I press the emergency stop.
Is this normal behavior? I also just upgrade my PSU to a super quiet computer PSU so I'm not sure if it always made this noise and I couldn't hear it over the original PSU fans.