HVAC inverter includes PLC and HMI

02 July 2013

The compact CFW501 frequency inverter has been designed by WEG to meet the needs of the heating, ventilation and air conditioning (HVAC) industry.

Currently, available with a power range from 0.18 to 7.5 kW the drives are suitable for cooling and heating systems in commercial buildings, as well as for all pump and fan applications in general. Thanks to their advanced features and design, they help users to optimise the operation of their motors, while being quick and easy to install and cost-effective to maintain.

The CFW501 is based on the same modular plug and play platform as the CFW500 product family. The units include a built-in micro-PLC, programmable according to IEC 61131-3, and an HMI. The interface offers specific engineering units for HVAC applications, such as bar, mbar and m3/hr, and is also available as a remotely controlled version for installation in a panel door. To allow for direct communication with the most important protocols in building automation, the CFW501 supports BACnet, MetaSys N2 and Modbus-RTU.

The inverter has been designed with simplicity of installation and operation in mind. It can identify up to 64 different plug-in modules, which makes it simple to also connect to major fieldbus systems including Profibus-DP, DeviceNet and CANopen. Additionally, expansion plug-in modules are available enabling easy customisation for bespoke applications.

A fire mode function prevents the motor from stopping when critical operating conditions are detected by the drive, such as a high internal temperature. The unit is also equipped with a bypass function which enables the user to power the motor directly from the mains. Both, scalar (V/f) and vector control methods are available to control AC electric motors. It features three PID controllers for process monitoring and more precision; the main PID controls the process while the two additional ones are intended to control independent process variables. Depending on the motor speed and load conditions, the power saving function reduces flux, thus decreasing losses and improving energy efficiency.

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