Vectrue Technology® - WEG Variable Speed Drive Control Technology

  • Four control modes in one drive, linear and adjustable V/F, VVW (Voltage Vector WEG), sensorless vector and closed loop vector (encoder interface factory built)
  • Sensorless vector control allows for high torque and quick response in open loop, even at low speeds
  • Self-tuning function automatically matches VSD with motor - load when on Sensorless, VVW and closed loop vector mode
  • Through adjustable V/F control it is possible to adjust a quadratic V/F curve and that implies energy saving when quadratic torque loads (e.g.: centrifugal pumps and fans) are being driven

Optimal Braking® - WEG Frequency Inverters Braking Technology 

In applications where high inertia and short deceleration times are involved, a large amount of energy is returned from the motor to the VSD. To handle this energy traditional VSDs have to dissipate it as heat in power resistors, such resistors are usually large and very expensive also the heat dissipation has to be taken into consideration during installation.

As an alternative to the use of braking resistors the CFW700 features a special braking method in vector control mode named Optimal Braking®. This innovation delivers rated torque with high performance requiring no resistor. The graph illustrated shows a comparison of the braking torque offered by the different braking methods used.

Remote Keypad

The keypad can be remote assembled by using this configuration, degree of protection IP56 can be achieved.

Simplicity

The new CFW700 was designed based on the Plug & Play technology concept where by plugging in expansion modules hardware and software recognize it automatically. Also this feature allows for easy installation and safe operation with no need for additional configuration.

Main Characteristics

  • Power supply:
    • 200 V single-phase: rated output current from 6 to 10 A (1.5 to 3 cv)
    • 220 V three-phase: rated output current from 6 to 211 A (1.5 to 75 cv)
    • 380-480 V three-phase: rated output current from 3.6 to 211 A (2 to 175 cv)
  • Compact structure, ideal for installation in confined spaces
  • High precision and reliability in speed and torque control
  • Robust hardware
  • HVAC version
  • Inductors on the DC link: no line reactance needed, installation on any network, no minimum impedance restrictions, compliance with IEC61000-3-12 standard
  • Isolated input for incremental encoder
  • Isolated RS485 interface
  • 8 digital inputs and 5 digital outputs
  • Smart cooling system: monitoring of the heatsink temperature and internal air on the electronic boards, monitoring and indication of the speed and running time of the fan

Technical Features

  • Multi-Speed: up to 8 preset speeds can be programmed.
  • PID Regulation: eliminates the use of an external controller for closed loop control, thus great performance of speed and torque can be achieved.
  • Ride Through: embedded in the CFW700 control this function prevents the drive from tripping during some power outage. It uses the kinetic energy stored through a forced deceleration imposed to the load by the VSD control algorithm.
  • Speed/Torque Regulation: open and closed loop (encoder feedback required).
  • Flying Start: it is able to start smoothly a motor connected to a rotating load regardless of rotation direction.
  • Control Options for DC Bus Regulation: prevents the drive from tripping when short deceleration time is required, vital for applications with high inertia loads.
  • S ramp: the smoothness at the starting can be mandatory for process e.g. the beverage industry, by setting up properly this functionality production losses caused by traditional starting methods can be avoided.
  • Three-Wire Start/Stop Control: no retentive contact can command the drive to start/stop the motor.
  • Electronic Potentiometer: the drive keeps increasing motor speed as long as the digital input remains closed.
  • Skip Frequency: for some applications specific frequencies must be avoided in order to protect the machine against resonance effect.
  • Motor Thermal Curve Adjustment: the possibility for separate adjustment between motor and drive allows for a much more effective protection for overload cycles.
  • Copy Function: by using the flash memory card MMF-02 parameter settings can be easily stored ensuring integrity and safety in case of replacement of the drive is needed.

Applications

  • Pumps and fans - reduction of the electric energy consumption, precise control of a process variables (pressure, flow, temperature) with PID regulator, maintenance and safety alarm indication
  • Compressors - reduction of the electric energy consumption, higher efficiency and demand control, lower starting current, prevention of mechanical wear
  • Load lifting - the vector mode ensures precise stop and speed control even at low rotations
  • Machine manufacturers and processes in general - free software, excellent cost effectiveness and easy operation