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Victor SPX User Guide
vexpro.com ctr-electronics.com
Copyright 2018, VEX Robotics Inc., Cross the Road Electronics
Updated: 2021-11-29
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Additional Information
Brake & Coast Modes
The Victor SPX has two modes: Brake and Coast. When a neutral signal is applied to the Victor SPX in Brake
mode, the motor will resist rotation, especially high-speed rotation. This is accomplished by essentially
shorting the motor leads, which causes a Back Electromotive Force (Back-EMF) to resist the rotation of the
motor. Brake mode does not have any effect when the motor is not rotating, but can make a large difference
in robot behavior when used on a motor attached to a high reduction gearbox. Brake mode does not impact
performance when a non-neutral signal is applied.
When a neutral signal is applied to the Victor SPX in Coast mode, Back-EMF will not be generated, so the
motor’s rotation will not be affected by the Victor SPX.
Switching between Brake & Coast:
To switch between Brake and Coast mode, simply push the B/C CAL button at any time. The Victor SPX is in
Brake mode when the button is illuminated red and Coast when the red light is turned off. Brake/Coast
settings are saved even if power is removed from the Victor SPX.
