Distributed frequency inverters offer integrated positioning control
Designed for motor terminal box mounting, Nord Drivesystems' new SK 200E frequency inverter series is being offered as an alternative to complex and expensive distributed servo solutions.
Available in sizes 1 to 4 with a performance range of 0.25 to 22kW, the units feature an integrated positioning control module and connection options for incremental and absolute encoders.
According to Nord, the series allows for the use of standard asynchronous motors even in tasks where relative or absolute position control is required. The integrated POSICON position control module is designed to enable users to program up to 63 absolute positions. Position information can also be transferred via a fieldbus interface, and up to six step lengths can be stored in the frequency inverter.
In all tasks, the control module's motion algorithm is optimised to ensure fast and safe positioning. Nord says even the basic versions include encoder evaluation, positioning control, an integrated brake chopper, a control module for an electromagnetic brake and a high performance sensorless current vector control which ensures that a position is held even under strong load fluctuations.
Furthermore, customers can adapt the inverters to suit the needs of any application through a range of internal and external expansion modules.
