C280S - Bidirectional drive

Code 280S series drive is a tachometer feedback three-phase voltage regulator using controlled diodes (SCR) driven by phase-limiting system. The voltage that powers the motor is the result of an analog process which maintains the speed constant, through the differential control between the reference value as an actual speed value, picked up by the tachometer generator, and the one set by the potentiometer or external analog voltage.

The result obtained by the combination of this system with the Rowan three-phase motor is an extremely silent and uniform constant torque and speed system, from zero to the maximum speed of the motor. The fact that controlled diodes (already overdimensioned) were adopted for the power portion enhances reliability in the case of overvoltages or overcurrents. Speed and rotation sense of the motor are determined respectively by the value and polarity of the reference signal with a max. range of ±10VDC. Functioning extends to all 4 dials; the matching motor is able to generate a driving torque and a braking torque in both rotation directions with a starting torque up to 3 times the rated torque. 

The system code 280S + Rowan motor is therefore particularly suited for fast movements (e.g. axes control) also when large inertial loads are driven, and without requiring any external device such as the braking resistors typical of frequency controls for normal asynchronous motors and DC motor drives.