variable frequency drive (VFD) installation

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VFD- Variable Frequency Drive

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variable frequency drive (VFD) installation

  1. 1. Study of VFD Installations
  2. 2. Basics Construction of VFD Inside the VFD there are 4 major sections:  rectifier (AC/DC Converter),  intermediate circuit (DC Link),  inverter (DC/AC Converter) and  control/regulation (for interface)
  3. 3. Working of VFD The operation of the drive is as follows : Power first goes into the rectifier, where the 3-phase AC is converted into a rippling DC voltage. The intermediate circuits then smoothes and holds the DC Voltage at a constant level or energy source for the inverter. The last section, the inverter, uses the DC voltage to pulse the motor with varying levels of voltage and current depending upon the control circuit. The control section uses the frequency, voltage and phase angle to control the inverter.
  4. 4. Function of VFDVFD is a system for controlling the rotational speed of a motor by controlling the frequency of the electrical power supplied to the motorVariable speed drives gradually ramp the motor up to operating speed to lessen mechanical and electrical stress, reducing maintenance and repair costs, and extending the life of the motor and the driven equipmentVariable-frequency motors on fans save energy by allowing the volume of air moved to match the system demand. By using VFDs the system can maintain a constant level or pressure without continuously cycling the pump or fan on and off. This allows for a better system control of a level or pressure, instead of cycling between a wide differential
  5. 5. How to analyze the necessity for VFD at a locationWe check for the pump valves that are throttledIf the valve is 30-40 % throttle (closed), then it indicates that flow required is lessIn such a case VFD can be installed, the valve can be opened fully and fluid’s speed and flow can be controlledFor example : Back water pump 2 at PM-1, was running at 1400 rpm taking 22 kW before installation of VFD. But after VFD installation, it consumes 12 kW while operating at 1100 rpm.
  6. 6. VFDs in Drive Room
  7. 7. VFD SHIFTING WORK IN PROGRESS VFD IN LINE
  8. 8. Wiring Diagram of Fan Pump Motor
  9. 9. VFD in Drive Room
  10. 10. How VFD works at these locationsVFDs are installed at Fan Pump motors.Fan pump motor responsible for providing stock to the Head BoxHead Box requires a control of either head or levelControl of a level or pressure in Head Box is done by VFDA reference signal is fed to the VFD and using a comparator, an error signal is generated based on the deviation of current value from the reference value. The controller in the VFD, then, increases/decreases the speed based on the signals generated
  11. 11. Head Box Pressure and Level Control LP Air from Air ReceiverDrive End Tender End HP Head box LT PT Inlet Pulp PV PCV LIC 4-20 mA IP PIC Air Drain SP Air Supply 1.4 0.2 To 1 kg/cm2 kg/cm2 Fan VFD Pump 4-20 mA IP- Current to Pressure Converter LIC- Level Indicating Controller SP- Set Point VFD- Variable Frequency Drive PV- Process Value LT- Level Transmitter PCV- Pneumatic Control Valve PT- Pressure Transmitter
  12. 12. Major Considerations while installing a VFD Motor Specifications VFD Specifications VFD input/output current Cable Size Starting parameters  Motor name plate  Reference speed  Overload current setting  Operating option (keypad/remote)  V/f ratio control
  13. 13. Conclusive advantages of using a VFD Energy Savings Better Process Control Reduced Maintenance Higher System Efficiency Remote Mounting
  14. 14. Thank You

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