We occasionally get questions about how the Danfoss low-voltage terminal blocks work that are on the VFD-- these are the ones mounted under the keypad on the drive. There are two variations that are both "spring-type" terminal blocks but the way that you release them is different.
For the older style use a flathead screwdriver in either the top or bottom slot (depending on which wire-hole you are using). Push in until the spring releases and you can insert or remove the wire.
For the newer style use a flat screwdriver into the flat spot IN BETWEEN the wire holes. Push in and both holes will recess and you can release or insert the wires.