Program features 77A “boost” function is also available for the activation of the timers: a signal source canbe selected to extend the activation time for a parameter-adjustable time period.SettingsParameter group 36 Timed functions (page 212).DC voltage control Overvoltage controlOvervoltage control of the intermediate DC link is needed with two-quadrant line-sideconverters when the motor operates within the generating quadrant. To prevent theDC voltage from exceeding the overvoltage control limit, the overvoltage controllerautomatically decreases the generating torque when the limit is reached. Undervoltage controlIf the incoming supply voltage is cut off, the drive will continue to operate by utilizingthe kinetic energy of the rotating motor. The drive will be fully operational as long asthe motor rotates and generates energy to the drive. The drive can continue theoperation after the break if the main contactor remained closed.Timer activeTimer enable signalBoost signalBoost time
