Hi Thank you for contacting us. I am sorry to hear that you are having these issues with your build. With regards to your VFD, how is your spindle running? Does it immediately spin to the maximum speed or spin to the minimum speed and then not adjustable? Our VFD parameters for programing the VFD can be found here: http://makerhardware.net/wiki/doku.php?id=electronics:1.5kw_spindle_vfd#vfd_parameters To use the Emergency Stop switch, you will need to flash the xPRO-V5 controller with the appropriate firmware. Our Emergency stop switches are the normally closed type and the xPRO will need to be flashed to enable this operation, for more information on how to do this, please visit our guide here:http://makerhardware.net/wiki/doku.php?id=electronics:xpro_v5_motion_control_system#emergency_stop_door_sensor Please let me know if you have any other questions, please feel free to contact us via our livechat or email. Kind regards Tawanda