The drive of the series cod. 290 is a 3 phase voltage regulator with tachimetrical feedback, which uses controlled diodes (SCR) controlled by a phase partializing system.
The tension that controls the motor is the resultant of an analogic process, which keeps the speed constant by means of the differential control between the real speed, from the tachometer generator, and the setting of the potentiometer or external analogic
signal.
The coupling with 3-phase ROWAN motors gives as a result a constant speed and torque system, which is extremely silent and uniform, from 0 to max motor speed. The choice of controlled diodes as power devices (they are also overdimensioned) gives more
guarantiees and reliability in case of extra-voltage or extra_current.
It is also possible to regulate acceleration and deceleration ramps according to the requirements of the device driven by the 3-phase ROWAN motor. The deceleration ramp functions only with the motor applied to move braking loads or irreversible systems;
in case of inertial loads, it is necessary to use other kinds of drives (see cod. 280), as cod. 290 has no dynamic braking. By connecting one of the following interface cards, cod. 199 - cod. 232 - cod. 249 - cod. 268, to terminal 8, it is possible
to perform a torque-speed combined control of a 3-phase ROWAN motor. This coupling is necessary when one wants to use a ROWAN motor as brake or static clutch with winders/unwinders.
