> For the complete documentation index, see [llms.txt](https://docs.creativeconners.com/docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.creativeconners.com/docs/stagehand/stagehand-parameters/setting-the-c3-value.md).
# Setting the C3 Value
Setting 0% for ambient voltage
## Why set the C3?
Every Stagehand motion controller sends an analog speed signal to the VFD telling it how fast to go. Even though we use the same components for all of our cards and Stagehands, each one of those small components has a +/- tolerance level that can affect miniscule changes to the ambient voltage of our cards. To compensate for this, we can essentially teach the drive what this ambient voltage is so it knows exactly where to assign 0%.
[How to Use the VFD Keypad](/docs/stagehand/stagehand-parameters/how-to-use-the-mitsubishi-vfd-keypad.md)
## How to Set C3
1. Press 
until the display reads **P.0**
2. Rotate 
**CCW** until you get to **C….** Press 
3. Rotate **CW** until you get to **C3.** Press
* The screen will display a value of X.X (close to 0.0)
4. Hold down the FWD Jog button on the Stagehand Control Card
* Do NOT rotate the knob. You should be at 0% speed
* The VFD screen should show a different value than it did prior to pressing FWD Jog
5. Press on the VFD Keypad to initiate the process
* Wait a moment for the VFD to beep and flash between your new value and **P C3**
6. Release the FWD Jog button
7. Cycle power on the VFD
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