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 offering 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.
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 program, monitor and control the drives using Allen-Bradley DriveExplorer and DriveTools SP software.