What is the use of SENSE + and - in a PSU?
Cables have some resistance, and when you pass current through them, they have a voltage drop. This causes the load to "Receive" less voltage than what is actually set on the power supply.

Sense wires measure the voltage at the load (sense wires pass very little current so they don't suffer that much voltage drop), and the PSU corrects the voltage based on the feedback they get.



Hopefully, this schematic will explain it better:







simulate this circuit &ndash; Schematic created using CircuitLab