Thank you Boyan,

The controller is a complete unit so it incorporates the breakout board as such, LPT1 input. I know that they have added an analogue 0-10V output for the VFD somewhere in the other 2 ports (LPT2 & 0-10V) but I don't understand what to connect. To me it looked like LPT2 is for a second command cable from the PC, but then there are no pin diagrams for the 0-10V port. Heiz have told me to 'connect the Inverter to the Port 0-10V and to the LPT2 port'. Am I just being stupid?

The VI is a +ve voltage okay and I have the VFD running on it's own by jumping FOR & DCM and a 10k pot on ACM, VI & +10V. It's just the control from the controller that's causing me a headache.

Many thanks,

Gavin

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