Ok so I set the frequency source to 0002 and no joy, I checked the voltage between 10v and com and was getting around 13vdc it was fluctuating then when I was adjusting the frequency on the plc but it wasn't having any effect on the frequency on the inverter, I then wired in a pot between 10v and com and changed the frequency source but that wouldn't work either the inverter just flashes with the current frequency.