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Everything About VFD Variable Frequency Drive In Water Pump
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Everything About VFD Variable Frequency Drive In Water Pump

Views: 236     Author: Edgar     Publish Time: 2022-07-13      Origin: www.bedford.com.cn

Water pumps play a vital role in running industries and daily domestic tasks. However, several water pumps have been installed with VFD variable frequency drives to ensure efficiency and durability. For example, VFD variable frequency drives can be installed in water centrifugal pumps to save valuable energy and increase the pump's durability. These drivers also allow monitoring systems to be more flexible than constant speed pumps, resulting in low electricity costs and minimal noise. Although these drives have been proven to provide you with a more energy-efficient pump, but are they worth the investment? Keep reading to discover everything you want to know about VFD variable frequency drives and if they'll be a good fit for your next water pump.

What Is The VFD Variable Frequency Drive And How Does It Work?

A variable frequency drive (VFD) is an electrical motor that uses one or more electric motors in place of a typical permanent magnet alternator. The electric motors are typically combined with an electronic feedback control system to regulate the output speed, which provides power when needed.

Most pumps take power from a direct current (DC) source, like a wall outlet, battery, or other sources. Once the DC voltage is applied to the motor shaft, it turns clockwise or counterclockwise until it slows down or stops. A VFD pump takes power from an alternating current (AC) source. VFD pumps convert the power from AC to DC using electronic circuitry within the pump itself. It lets DC power drive the motor's shaft directly without going through a gearbox or other mechanical parts that may need to be adjusted periodically. VFDs divide the output power equally between the input terminals, so each input terminal receives the same amount of power to run efficiently.

The Requirement Of The VFD Used In Water Pump

You need a manual and an electronic control unit (VFD) to control a pump. And it's advisable to have both of these. However, if you use only one of them, you will have to pay attention to the following.

For example, if you use a VFD on a pressure gauge pump, it will not be possible to set the maximum pressure limit with the automatic setting. In this case, the value that appears on the gauge will be the minimum value allowed by the electronic controller – this may not be enough for cleaning equipment or valves. So you might have to use the electric control unit for optimal operation. The electric control unit is a high-performance, programmable device that regulates the flow, pressure, and temperature with the help of a microprocessor.

How To Choose VFD?

It's a common misconception that VFD variable frequency drives are solely for "power-hungry" machines like water pumps and generators. But there is a wide range of applications for these drives, from pumps to compressors to fans and even pumps for air conditioning systems. The trick is to understand which loads you're dealing with and how the VFD can help meet their higher efficiency. In general, there are four types of loads.

1. Constant Torque Loads

These are used to provide direct current voltage to the motor windings without any feedback. A constant torque load requires very little mechanical energy to operate but extremely high amperage to drive the standby motor mode. This type of load does not require an inverter for operation. A constant torque load is often used in highly technical applications where frequent start-up or restarting may not be necessary but is required for safety reasons.

2. Variable Torque Loads

These are designed to vary their torque output with changes in load. This type of VFD works best with high-torque and high-speed motors because they can precisely control motor speed while still keeping constant torque at low speeds. It's also useful for pumps with variable loads like those found in rainwater tanks, lawnmowers, or other sprinkler systems.

3. Constant Horsepower Loads

Constant horsepower loads (the most common application) represent steady-state performance, where the output stays consistent over time. Take an example; if your pump is running in reverse and you set it for constant horsepower, then it will run at its highest output when running in reverse. When connected to constant load torque, the normal operating speed will differ from that of a constant horsepower load. If you want to determine if your system requires a VFD and what type should be used, first determine if your pump can handle constant horsepower or constant torque loads. To find a constant horsepower load, you'd check the RPMs of a motor as it runs overtime.

4. Impact Loads

Impact loads, on the other hand, represent short bursts of high-power, a high-speed operation that occurs every few seconds. An impact load is often associated with applications such as an air compressor or an electric motor in a blender. These drives tend to be cheaper than constant horsepower drives, but they still need a voltage source. It can mean a dedicated power supply or an auxiliary DC/DC converter, which you can use to provide the needed voltage from your existing panelboard wiring.

Various designs and functions of variable frequency drive selling in the market, it is important to choose a suitable one from a trusted inverters manufacturer . We at Bedford try our best to offer the best quality product and earn customers' prizes. Here recommend you our popular VFDs.

Bedford VFD Variable Frequency Drive For Water Pumps

Variable frequency drives are a cost-effective and environmentally friendly solution for water pumping applications. Our Bedford's variable frequency drive (VFD) is a great way for homeowners who want to upgrade their pumps after years of hard use. The B503D and B603D series drives have upgraded features that deliver the exact amount of energy required at any given moment without the need for external controls. The drives are designed for optimal operation from the synergy function to the anti-clogging and anti-freezing function. Additionally, they have two operating modes, multiple water supply fault alarms, and 22 fault protection functions. Therefore, you can use them with complete confidence.

Why Choose Bedford?

Bedford VFD variable frequency drive is designed to provide extreme precision for a smooth and efficient motor start-up. These drives are available in various models, including compensation and Overspeed protection options, pulse width modulation (PWM) control for improved efficiency, intelligent load sensing technology, and extended service life.


Bedford has been China's leading manufacturer of water pumping equipment for 35 years. It is an advanced technology, and excellent expertise that makes many customers in different fields trust us to solve their technological problems. So if you want to save money or automate your water pump and transfer your water pressure on a timer, you should definitely give Bedford a try!