SEtting Fuling DBZ200 Inverter

Hi everyone i`m new to the forum and would like a little help please.

I have a Fuling DZB200 inverter driving a motor which i would like to run/control from an external controller.
The controler will have an OFF---Run FWD, and Run REV switch and a Potensiometer to vary the speed of the motor.

My problem is i cannot see which terminal will give the +Vdc to supply the OFF--FWD--REV switch which will link to the FWD and REV terminals on the inverter terninal block.

There is a +10Vdc terminal but as i understand this is for the supply to the Pot.

Any help would be appreciated.
Many Thanks.
Reg