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  • Pipe-Fill, Broken Pipe, and Under Load Detection

    Variable frequency drive (VFD) systems help reduce energy consumption and provide smart control of the system with the integration of a pressure transducer to regulate constant pressure. To run a constant pressure system, the VFD must administer an algorithm called a proportional-integral-derivative (PID) loop ... 

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  • Motors and Drives: Even the Best Relationships Have Issues

    Over the last 20 years, variable-frequency drives (VFDs) have become the dominant form of motor control in the HVAC industry. Tremendous energy savings and more-precise control sit atop a long list of benefits that have propelled VFDs to industry-standard status ... 

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