Product category:
Motors and Variable speed drives
News Release from: Rockwell Automation | Subject: PowerFlex
Edited by the Processingtalk Editorial
Team on 19 March 2007
PowerFlex AC drives for fan and pump
applications
High-performance AC drives offer flexible, cost-effective speed control in a variety of variable torque fan and pump applications: increased drive power ratings expand their commercial applications
To help contractors and engineers efficiently apply variable-frequency motor control to a broader set of motor-driven applications, Rockwell Automation has expanded its Allen-Bradley PowerFlex 400 drives, to include increased power ratings up to 260kW Optimised for commercial fan and pump applications, PowerFlex 400 AC drives feature built-in network connectivity for seamless integration into building automation systems, as well as flexible packaging options for easy installation and start up
This article was originally published on Processingtalk on 27 Aug 2007 at 8.00am (UK)
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"Applications involving large centrifugal loads and changing flow rates, such as air handlers, cooling towers and chillers, are prime targets for significant energy savings," explains Jonathan Smith, UK field business leader - Drives, for Rockwell Automation: "PowerFlex 400 variable-frequency drives deliver optimum speed control to help users improve air handling efficiency, optimise energy consumption and reduce overall energy costs".
An integral RS485 communications interface provides support for most building automation networks, including Modbus RTU, N2 and Siemens P1-FLN.
These protocols are parameter selectable and require no additional hardware or software.
For expanded communication capability, optional add-on modules provide connectivity to LonWorks and BACnet networks.
PowerFlex 400 HVAC drives feature an embedded PID controller that automatically adjusts the output frequency to maintain a process variable.
Three programmable skip frequencies and bands prevent the drive from running continuously at resonant speeds, which could cause mechanical breakdowns.
Selectable fan and pump curves provide reduced voltage patterns for centrifugal fan and pump loads.
A sleep function allows the drives to be cycled off when the system demand drops below a preset level, and restarted automatically when the demand increases.
For applications that require unattended operation, a "Start At Power Up" function allows the drives to resume running once power is restored after a power outage.
Users also can connect the drives to fire and safety systems via freeze/fire and purge inputs and can easily programme, monitor and control the drives using Allen-Bradley DriveExplorer and DriveTools SP software. Request a free brochure from Rockwell Automation ...
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