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01/04/2020 - 16:14 PM

Application of VFD-CP2000 inverter to save electricity in pressurized pump system

Working principle and function of the inverter for pressurized pump solution:

The inverter is inserted into the motor's electronic circuit and it can change the circuit frequency thereby changing the number of revolutions on the motor shaft, according to the same law in centrifugal pumps, when the number of revolutions the flow rate and pump head will change accordingly.

Working principle of the inverter for pressurized pump solution:

  • The inverter system applies the principle of closed-loop control
  • Pressure signals from the water supply network are brought back to the processor, compared with the pressure signals installed as required.
  • The deviation between these two values will be processed by a program specifically for the system to give the optimal control signal to the frequency converter.
  • The inverter is programmed to process the signal and output the appropriate frequency for the current flowing to the motor. The number of revolutions on the pump shaft is varied and meets both the required flow and pressure on the pipeline network.

Principle of system adjustment for pressurized pump solution:

  • When the water demand is lower than or equal to the supply capacity of a pump, the water pump is equipped with a frequency converter.
  • When the demand for water increases greater than the supply capacity of a water pump and is less than or equal to the supply capacity of two pumps, one pump will run at maximum with the rated number of revolutions, the inverter pump replenishes. enough traffic as required.
  • As the flow requirement increases further or decreases, the same goes for tuning.

Functions of the inverter for pressurized pump solution:

  • Automatically control pump number and pump rotation to provide enough Q as required.
  • Automatically alternately change the pump and the backup pump.
  • Soft start and soft stop avoid voltage drop in the system current.
  • Protects against overload, circuit break, phase loss, and surge

Application of the inverter for pressurized pump solution:

  • Modulate, stabilize the flow and pressure at a certain level of the pressurized pump system
  • The inverter is widely used for all pressurized pump stations from small to large capacity.
  • It is used to regulate capacity and alternate pressure for water supply systems using air conditioners.
  • The inverter has high cost but the ability to save and reduce the construction area of the pump station.

Consulting on Delta pump solution with VFD-CP2000 series

  • According to the traditional control method, the flow adjustment of the pump is done by a throttle valve so the engine still runs at rated mode even when the load demand is satisfied and therefore does not lead to efficiency. energy saving.
  • The operating principle of the vfd-cp2000 inverter is quite simple, firstly, a 3-phase or 1-phase AC power source is rectified and filtered into a DC power source by a diode rectifier bridge and a capacitor.
  • This DC voltage will be inverted to a three-phase alternating voltage with variable amplitude and frequency.This is done through IGBT with PWM pulse width modulation method.
  • With today's developed semiconductor technology, the pulse switching frequency can reach the ultrasonic frequency range to reduce motor noise and reduce losses on the motor core.
  • Considering a two-pump system as follows, the requirement is to stabilize the pipe pressure so that the pipeline pressure is always constant at the set value.
  • We will use a pressure sensor to send the pipe pressure signal to the inverter, the inverter will perform calculations based on the set pressure signal and the feedback pressure followed by the PID algorithm to keep it. The pressure on the pipe is constant.


For detailed explanation of solution, please go to Download / Select device "Inverter" / Select document "Application"

Diagram of Control Solution for multiple pressurized pumps with VFD-CP2000 inverter:

Application of VFD-CP2000 inverter to save electricity in pressurized pump system

Picture Application of VFD-CP2000 series inverter to pressurized pump solution:

Application of VFD-CP2000 inverter to save electricity in pressurized pump system

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Hotline: 0916 949 582

** Bussiness Department
Hotline: 0913 949 582

 (According to the Product Engineering Department of ETEC)


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