Spindle RPM not correct

[Owlwood]

Hi Guys
Finally got around to setting up the Spindle control with UCCNC - AXBB-E and my HY VFD.
Everything is working great apart from the RPM is not accurate.
When UCCNC calls for 12000 RPM the VFD is correct and shows 12000 RPM
When UCCNC calls for 16000 RPM the VFD only reach's about 14800 RPM just about 10% difference
The error gets bigger the higher the RPM
What settings do I need to adjust to get the VFD to reach the correct RPM?
Cheers

[cncdrive]

Try to higher the PWM max. value if it is not already on max. 100%.
Also you can adjust the VFD's input Volts/Hz parameter.