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New series of compact variable speed drives for low-power motors

12th February 2016

Posted By Paul Boughton


WEG has launched a new series of compact variable speed drives (VSDs) to enhance energy efficiency across a wide range of applications requiring low motor power. Designed to drive motors with power from 180W to 4kW, the CFW300 series is ideal for relatively small machinery such as centrifugal and metering pumps, fans and ventilators, stirrers and mixers, extruders, roller conveyors, cutting machines and rotary filters.

Easy to use and maintain, the CFW300 features an integrated micro PLC and a user-friendly control panel with LCD display. Installation is also easy and quick thanks to plug-and-play extension modules and the drive unit’s fan can be easily removed for maintenance.

The CFW300 has two slots for extension modules - one for communication and the other for a wide variety of I/O modules.  This enables users to integrate RS485 or RS232 interfaces and use Modbus RTU, Bluetooth or USB communication protocols. The VSD can also be connected to fieldbus systems such as Profibus DP, CANopen or DeviceNet, or configured for operation under remote control. An Ethernet IP interface is also available. As such, it provides increased flexibility and high levels of connectivity to best fit users’ needs.  Other accessories include a plug-in EMC filter, which can be connected to the VSD quickly without tools or wiring and mounted on the top-hat rail.

Designed to operate at ambient temperatures up to 50°C without derating, the CFW300 is equipped with independently acting, integrated thermal protection functions for the motor (electronic motor circuit breaker) and the drive. In addition, the drive has varnished circuit boards (IEC 60721-3-3, category 3C2), for enhanced corrosion resistance, which contributes to longer service life, while an optional flash memory card enables optimal storage and convenient loading of parameter data sets.

The CFW300 will initially be available in frame size A for rated power from 180 W to 1.5 kW and frame size B for rated power from 2.2 to 4 kW. It will provide supply voltage flexibility with versions for single-phase and three-phase power. The single-phase version can also be powered directly from a DC supply connected to the DC link, in order to drive three-phase induction motors from a DC power source.









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