Flexible and configurable cabinet inverters are compact
13 April 2010
SK 500E series cabinet inverters from Nord are available in six modular sizes with performance ratings to 22kW and a wide selection of interfacing options and expansion modules that allow industrial automation applications from simple speed control to complex servo positioning. For complete flexibility these options and modules can be applied throughout the SK 500E range and within each power rating the cabinet's external dimensions are unaffected ensuring that retrofitting, system scalability, and functional upgrades may be carried out with minimum inconvenience and maximum efficiency.
All models provide sensorless current vector control and feature brake management, a brake chopper, and Class A line filtering as well as a PID controller for process control, configurable parameter sets, and automatic flux optimization which can save up to 30% energy. Even the basic model which is equipped with five digital inputs, two analog inputs, one analog output, and two relay outputs, provides a wide range of connection options.
Advanced models can include such extras as 'Safe Stop' in compliance with EN 954-1 and EN 13849-1 (up to safety category 4, stop category 0 and 1), an on-board CANopen interface, a TTL incremental encoder input, additional digital input and output channels, or the POSICON positioning control. Expansion modules called Technology Units include Profibus, CANopen, DeviceNet, and INTERBUS modules for direct fieldbus control as well as an AS-interface with provision for two sensors and four actuators.
Furthermore, models are available with a separate 24V power supply for the control card, allowing access to parameter data and the bus interface even if the mains power is switched off. This enables specific applications such as elevator evacuation and increases online availability. Many SK 500E models are optionally available as cold plate versions or with heat sinks for installation outside the control cabinet (through-hole installation).
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