Right the keypad membrane buttons are momentary.I believe you will need to enable the remote functions in the menu- somewhat overstated to call it "programming"
but there are a couple things to change- you may also have to choose momentary or continuous switch contacts in the menu
I tried using one for wired mode and it only works momentarily.
Needed to use a continous contact for the wired functions. Maybe there is a provision in the menu, if so on the 5 hp Vevor model I missed it.
I do not see why the 15 volt VFD supply is needed for function control- the one in the diagram just utilizes the common for any of the selectible control inputs. I did make use of the VFD 5 Volt for LED switch lighting.