Lenze frequency inverter helps polyester rope producer to solve quality and downtime issues
Lenze
SMV frequency inverter
Lenze has supplied a manufacturer of polyester rope with an SMV frequency inverter to solve issues of poor product quality and unplanned downtime, owing to breakages, on a 10-station winding machine.
The client — based in Poland — needed an integrated system that would eliminate downtime, remove the need for manual adjustments and produce an evenly wound product.
The retrofit system used the IP31 version of the SMV inverter — a sensorless vector drive suitable for dynamic speed control — for mounting in a cabinet. A version of the SMV is also available in an IP65 enclosure for decentralised installation.
Position signals from each of the 10 stations’ dancer rolls are inputted into the SMV’s integrated PID processor, which compares actual signals with a set point and adjusts the pull speed in order to compensate for any errors.
SMV inverters are available for single-phase inputs of 0.37–2.2kW and three-phase inputs of 0.37–45kW and feature a plug-in memory chip that stores all of the drive parameters, enabling them to be quickly reprogrammed. They are available with a range of communications options, including CANopen, Profibus, Ethernet/IP and Devicenet.
Key benefits of product application
- The inverter maintains a steady tension in the rope strand
- As a result, reels of rope are consistent in shape
- It has also eliminated rope strand breakages and the resulting downtime
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