Activates or deactivates the undervoltage control of the intermediate DC link.
If the DC voltage drops due to input power cut off, the undervoltage controller
automatically decreases the motor speed in order to keep the voltage above
the lower limit. By decreasing the motor speed, the inertia of the load causes
regeneration back into the drive, keeping the DC link charged and preventing
an undervoltage trip until the motor coasts to stop. This acts as a power-loss
ride-through functionality in systems with a high inertia, such as a centrifuge