How to choose a frequency inverter for a borehole pump


  1. Why one should put a frequency inverter on a borehole pump
  2. How to choose a VFD

Nowadays, the task of autonomous water supply via a borehole is often required in both private households and industrial facilities. 

The motivation to switch to such a method of water supply can be poor water quality, interruptions in water supply, the desire to save money. To obtain a cost-effective system of autonomous water supply with a high level of reliability and functionality should consider the use of a frequency inverter for the borehole pump 220V.

Although a frequency inverter for the borehole pump is relatively expensive, the system will be more reliable, durable and protected if properly selected and designed.

Why one should put a frequency inverter on a borehole pump

Despite the apparent complexity and redundancy of control in a simple system, a frequency inverter for a submersible borehole pump is justified even for domestic solutions. The installation of such equipment allows:

  • Get a smooth start of the pump without current consumption spikes and water hammer;
  • Maintain accurate system pressure regardless of fluid consumption;
  • Allows the construction of stable autonomous water supply systems with a small and inexpensive storage tank;
  • Protect the pump motor against mains voltage surges;
  • Detect leaks in the system;
  • Protect the motor against jamming and dry running.

In fact, such a system protects an expensive pump from breakdowns for various reasons and ensures optimum consumption of energy. In other words, the additional investment in a frequency inverter and a pressure sensor for feedback pays for itself very quickly.

How to choose a VFD

To select a frequency inverter for a borehole pump, the following factors must be taken into account:

  • The power rating of the pump and the starting current. A frequency selector is required, which has similar parameters slightly higher. The best option is a reserve of 20-25% or more.
  • Possibility to connect a system pressure feedback sensor.
  • Monitor pump running modes and deal with emergencies.

Also in most cases a 220v frequency inverter for a borehole pump is required, as most applications use low-power pumps and there is no possibility of connecting to a three-phase mains supply.

There are various types of frequency inverters on the market today, taking into account the operating principle of the system in which they are used. For example, the inexpensive ER-G-220-02 series can be used to control a borehole pump. They are designed for 220 V mains operation and can control pumps with an output from 0.5 to 1.5 kW.

When you need help selecting a frequency inverter to control your well pump and advice on its connection and configuration in an autonomous water supply system, you can always turn to our ASB-Drives specialists.


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