when the motor is decelerating under load, the kinetic energy of that load is transferred back through the drive electronics to the power supply connection. This increase in voltage can trip the overvoltage protection of a switching power supply and the excess energy will be transmitted back to the driver, causing damage to the driver or power supply. The RC010 regeneration clamp is designed to solve this problem by absorbing the regenerated energy in the capacitor and shunting excess energy through the power resistor.
