Quote Originally Posted by Pugwas View Post
Hi all, just trying to set up a 4kw 380v VFD for controlling the speed of a spray booth extract fan, 3 phase 1440 rpm. out of the box using the rotary knob the max speed I am getting is about half what it was when direct on line, help would be appreciated. The manual is very difficult to take in.
You need to supply more info for us to be able to help, such as the model # of VFD Huanyang makes many different models and any parameters you have changed or set up. Also, details on the Motor plate would help. ie Voltage, current, etc.

Also, are you sure it's a 380V output VFD.? Most are 240 single-phase inputs with 240V 3-phase output. Not many provide 240v input with 380v output and I don't think Huanyang makes one but could be wrong on that.!