C6 - Variable Speed Control Board

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C6 - Variable Speed Control Board


This card lets you control your spindle with step and direction signals, as if it was an axis motor. It convert the step signal to an analog (0-10VDC) and by using the onboard relays you can control the direction (CW/CCW) and enable the drive (On/Off). A Variable Frequency Drive or Inverter works by modifying the frequency for AC motors. You can control most of these devices with an external analog signal (0-10VDC). That is, if there is 5VDC coming into through the control signal, the motor will run at 50% of full speed, if there was 10VDC, the motor will run at 100% of full speed. If there is no signal coming out, then the motor will stop. This unit can also be used on many DC motor controllers by replacing the potentiometer that controls the speed.


  • Inputs a frequency (step) and outputs an analog 0-10VDC.
  • Have two relays that can be used to control the direction and enable and disable the drive.
  • Opto-isolated output signals. The analog and CW and CCW signals are optically isolated, so this board can be used with drives that make grounds common with the mains that drive the VFD or motor.
  • All TTL +5VDC or +3.3VDC Signals. Interface directly with parallel port interface products and other cnc4pc.com cards. 5VDC (TTL) signals are very common among automation devices.
  • Flexible design. It works with cnc4pc’s products, directly through your parallel port, or through many other parallel port control products.
  • RJ45 Connector. This connector is for connecting the boards directly using a standard RJ45 cable, allowing can be used to carry input signal and power line.
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Documents and Download

Product Manual

Software, Installers and Configuration Files

Wiring Information


  • Mach4 C6 Speed Control Board Configuration with the ESS - Ethernet Smooth Stepper
  •  Go To


   Frequently Asked Questions and Answers

  • GlenMorr - 4 years ago
    I have a Seig FC350BJ/110V spindle drive on a X2 Harbor Freight mill. I am interested in buying the C6 board to allow Mach3 control of the spindle. Do you have wiring diagrams and Mach 3 configuration notes on how I can use the board? Thanks

    It is ideal to use a breakout board that has the spindle control circuit built-in and that uses a Safety Charge Pump.  This will greatly simplify your wiring and using a Safety Charge Pump when wiring your system delegate starting your spindle to the...
    Read more

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