Nord Frequency Inverter Drive Provides Position Control

Nord Drivesystems has released a variant of its Nordac SK500 family of frequency inverter drives incorporating sophisticated position control capabilities The Posicon supports closed-loop applications with sophisticated motion control features such as the ability to program relative or absolute positioning, synchronising, gearing and S-ramp movement profiles.

According to Nord, drives fitted with Posicon allow users to build systems with closed loop position and movement control, using feedback from a standard incremental or absolute encoder on the motor shaft, or from a remote mounted encoder. Posicon allows users to store up to 15 positions, which are regulated accurately, even when faced with large load fluctuations. Updating of positional data over field buses is available for applications requiring a higher number of positions.

Programming acceleration and deceleration ramps, or S-ramp movement profiles can be used to regulate the performance of drives as required in positioning applications. If the motion required is circular Posicon can automatically determine the optimum path to the target position. In addition to programming a drive using the inverter’s integral man-machine interface, users can employ Nord’s PC software package, Nordcon.

An overload capability is available to system builders. Overload currents of 200% can be provided for 3.5 seconds. However, overload currents of 150% can be maintained for a full minute.