Why put an electric variable drive on pump?
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Those who are looking for an answer to the question «Why put an electric variable drive on pump?» often ask the following questions:
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Here is why you MUST use variable speed drives in pumping applications (photo credit: ABB) Variable speed drives are crucial when limiting the life cycle costs (LCC) of a pump station. The three main costs are energy, initial investment and maintenance. Many analyses show that energy consumption is the dominating element of the LCC, especially ...
Using variable speed drives (VSDs) in pump applications (photo credit: motorsandcontrol.com) Pumps are one of the most common variable speed drive (VSD) system applications and special interest has focused on improving their energy efficiency by using variable speed control instead of throttling or other less efficient flow control methods.
There are two primary reasons why someone might consider operating pumps on variable frequency drives: To simplify the pumping system by minimizing the different sizes of pumps needed. To ensure the pumps operate as efficiently as possible.
VFDs (Variable Frequency Drives) can achieve reduced flow by providing variable speed pump operation. This results in reduced system pressure and operation near the pump's Best Efficiency Point. In addition, maintenance costs might be reduced.
By matching pump output flow or pressure directly to the process requirements, small variations can be corrected more rapidly by a VSD than by other control forms, which improves process performance. There is less likelihood of flow or pressure surges when the control device provides rates of change, which are virtu-ally infinitely variable.
The other benefit of using a variable speed pump is that it provides you with a constant water pressure supply. This is because you can set an operating pressure on the controller and the pump maintains this, it stops the pressure and flow spikes that occur with most conventional house and irrigation pumps.
These pumps use computerized controllers, also known as Variable Frequency Drives or VFD's, and are designed to separate people from as much of their hard earned money as possible. Many government agencies, electric utility companies, engineers, manufacturers, suppliers, and installers are either part of the scam, or just caught up in the lies themselves.
Choosing a pump sized to operate close to its best efficiency point (BEP) addresses both concerns. When an application requires variable flow or variable head, both variable speed and multiple pumps should be considered. In some cases, a combination of both may produce the most efficient solution.
A novel way to provide constant torque at higher-than-base speeds is to run a 230-volt motor on a 460-volt VFD. In these applications, the drive is programmed to provide full voltage at 120 hertz and then reduces voltage proportionally as speed is reduced.
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