Siemens introduces new cabinet inverter for pumps

IDT2013104098-01_300dpiWith the Sinamics G120P Cabinet, Siemens Drive Technologies Division is now able to provide an inverter cabinet unit especially adapted to pumps, fans, and compressors. The power spectrum of the existing Sinamics G120P series is thus extended to 200 kW. In line with the Integrated Drive Systems strategy, the drive is optimally adapted to operation with Simotics severe-duty and flexible-duty motors. For example, the inverter output currents have been adapted to the motor rated currents and the motors to the rated pulse frequencies of the inverters. Because the components interact as an integrated drive system, the voltage is optimally utilized and the noise level of the motor is also reduced by 4 dB. The efficiency of the overall system is 98 percent. The new inverter also has application-specific functions that enable economical operation of pumps.

Integrated energy-saving functions also contribute to the high energy efficiency of the inverter. For example, eco mode enables motor currents to be reduced in partialload operation. The Profinet-based Profienergy data interface permits unneeded loads to be disconnected, reducing costly load peaks. With variable-speed operation of pumps with quadratic torque, basically up to 70 percent of energy can be saved.

For economical pump control, Sinamics G120P Cabinet has application-specific functionalities, such as the PID controller, which controls the drive speed as a function of process variables, such as temperature, pressure, flowrate, and air quality. When requested by the PID controller, additional pumps can also be switched on and off by the motor staging function, which is an advantage, above all, for pump systems with closed-loop control of the volume flowrate. Mechanical resonance and therefore damage to the tube system is avoided by suppressing certain frequencies.

The new inverter is a ready-to-use cabinet unit that is easy to install and commission. The user is supported by software tools Sizer for configuration and Starter for parameterization and commissioning featuring pump-, fan- and compressor-specific wizards and macros. This is supplemented, among others, by a fast motor identification. There is sufficient space for flexible design of the cabinet interior. Long cables and optimized connection options also ensure flexibility of location. Thanks to its rugged design, the Sinamics G120P Cabinet also permits reliable operation in an often tough environment and offers maximum plant availability with low maintenance.

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