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Inverters step into servo arena

Inverters step into servo arena
The need for positioning is common in a wide range of machinery, for example lifting, rotary tables, conveyors, gates and doors. Such applications have traditionally been achieved by servo drives but today there are cost saving alternatives. Now using inverter technology a range of scalable solutions can achieve the optimum balance between performance and economy.

The 8400 inverter drive models StateLine, HighLine and TopLine open up new opportunities for simple through to fast and precise positioning, giving cost savings for many machines. Only where true top end performance is needed with highest dynamics is it necessary to select a servo drive. The 8400 StateLine is more than capable of handling simple positioning in which movement takes place to a limit switch, with or without feedback. Frequencies up to 20 cycles per minute can be achieved. Without feedback, typical accuracies of +/-10deg are possible.

Stepping up a level, the 8400 HighLine has high speed encoder evaluation at 100kHz so it suits closed loop positioning with high accuracy. Where a HTL encoder with 2048 pulses is fitted, an accuracy at the motor shaft of one pulse or 0.05deg can be achieved. Furthermore this can be done up to 180 cycles a minute suiting demanding applications such as cross-cutters and rotary feeds.

Whilst the StateLine and HighLine operate with standard asynchronous motors, higher dynamics can be achieved by using the lower inertias of permanent magnet synchronous motors. Here the 8400 TopLine is the answer, ideally matched to the Lenze MCS servo motors and capable of resolver and incremental encoder feedback.

Lenze scalable solutions then turn to servo drive technology for the highest performance where dynamic moves have to be completed in a few milliseconds. The 9400 servo range and the multi-axis ECS range are proven, for example in robotics, high speed packaging and materials handling. All these drives are programmed with the same L-force Engineer software, and have optional integrated safety that simplifies your control system.

Of course every machine design is different and the statements above are generalised, based on field experience. If you want to know the Rightsized positioning drive for your machine, the answer lies in the Lenze DSD selection software. Lenze Engineers can evaluate different options and predict performance and costs, even the costs for energy usage.
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