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AC and DC drives make Nuremberg debuts

20 November, 2009

At this month’s SPS/IPC/Drives show in Germany, Siemens is launching a range of modular frequency inverters designed for pump, fan, and compressor applications. It is also showing a range of DC converters that combine open- and closed-loop controls in the same housing as the power stage, resulting in a compact, space-saving design.

The compact, IP55-protected Sinamics G120P AC drives (above) cover ratings from 0.37–18.5kW and incorporate special functions for improving energy efficiency. They are characterised by low reactive power values. Extra components such as line reactors are not needed to meet the requirements of IEC/EN 61000-3-12.

The drives comprise a controller, a power module and an operating module, and can be fitted with an optional intelligent operator panel.

A hibernation function enables energy-saving standby mode based on setpoints. By switching automatically to line-fed operation at the rated speed, energy consumption can be reduced by up to 3%, Siemens claims. An auto-ramping function can limit currents and avoid power peaks.

The drives can be configured using Siemens’ Starter and Sizer software tools and a USB interface is built in for commissioning and diagnostics purposes. The software includes application-specific functions and modules, such as a digital real-time clock, flying restart and PID controller.

The new Sinamics DC Master converters (above) span ratings from 15–3,000A, with higher ratings achievable by connecting the converters in parallel. They are aimed at applications such as rolling mills, wire-drawing machines, extruders, lifts and cable railways. The scalable converters can be adapted in function and performance to suit the application. They can be commissioned using standard Sinamics Sizer and Starter tools.

There is a choice between standard or advanced controllers, or combinations of the two. The converters can be supplied for two- or four-quadrant operation. Built-in Profibus and Profinet ports, and analogue and digital interfaces, allow the converters to be integrated easily into existing and new automation systems.

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