Wiring sample of the C94 board connection with Huanyang VFD



  • The initial installer configured UCCNC or Mach3/4 to control the spindle, you only need to set the max spindle speed and set the jumpers on the C94 to control the relay logic (FOR/REV or ON/OFF and CW/CCW).
  • Before wiring to the VFD, use a multimeter to verify that you do get a 0-10vdc proportional to the commanded speed and that the relays are clicking as expected when you command the spindle.
  • After wiring, make sure to configure the VFD to take the control signals from the terminals.