Setting the C4 Value

Scaling the Analog Speed Signal

Why set the C4?

Every Stagehand motion controller sends an analog speed signal to the VFD telling it how fast to go. Depending on the Stagehand type, this same signal also describes the direction the motor should spin. These speed signals are called Unipolar (speed only) and Bipolar (speed and direction).

  • The Stagehand Pro 3 &4 and Stagehand Apprentice utilize a 0-5vdc speed signal with seperate direction switches.

  • The Stagehand Classic and Stagehand Pro 2 utilize a +/-10vdc speed and direction signal.

In either case, the Mitsubishi VFD needs to be calibrated to the analog speed signal coming in so that 100% speed signal results in 60hz output to the motor. Some models have been calibrated at CCI HQ and have a label on the back or on the VFD Keypad showing the value that should be entered in Parameter C4.

Set C4 from A Known Value

How to Use the VFD Keypad

  1. Press until the display reads P.0

  2. Rotate CCW until you get to C…. Press

  3. Rotate CW until you get to C4. Press

    • The screen will display a value of X.X (close to 0.0)

  4. Rotate CW ONE CLICK to view the current C4 value (Default is 100)

  5. Rotate CW to your known C4 value. Press to confirm value

  6. Cycle power to the VFD

Set New C4 Value

How to Use the VFD Keypad

  1. Press until the display reads P.0

  2. Rotate the CCW until you get to C…. Press

  3. Rotate the CW until you get to C4. Press

    • The screen will display a value of X.X (close to 0.0)

  4. Jog the Stagehand forward to 100%

  5. Continuing to hold the FWD Jog at 100% and press the key on the VFD keypad

    • Wait a moment for the VFD to beep and flash between your new value and P C4

  6. Release the FWD Jog button

  7. Cycle power on the VFD

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