Category Archive for: «Variable Speed Drives»

Here is why you MUST use variable speed drives in pumping applications

Variable speed drives in pumping applications Pumping applications represent a significant opportunity for applying variable speed drives (VSDs) in new, as well as retrofit installations. The majority of pumping applications need to be controlled. It is unlikely that a pump will run continuously at a maximum speed. Variable speed drives are crucial when limiting the life […]

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What size of a frequency converter do I need? (4 methods to find out)

Frequency converter (FC) rating When determining the rating of a frequency converter at a given load the first step is to consider the load characteristics. There are four different methods for calculating the required output performance and the choice of method depends on the motor data. However, first let’s start with the basics of motor […]

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Comparison of 4 Different Flow Control Methods Of Pumps

Pump as a part of the process // When in use, the pumps are always part of a pumping system. A pumping system is usually a network of pipes, tanks, valves and other system parts. The receiver is usually at a higher geographic level than the supply of the system. These parts can be also […]

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Applying Variable Speed Drives To Control Pressure

Pressure Control Pump Station // Using variable speed drives (VSDs) to control pressure reduces the electrical energy requirements by reducing the amount of hydraulic energy actually produced. A basic pressure control pump station is equipped with one pump controlled by one variable speed drive (VSD). In some pump stations, pumps connected in parallel are a more […]

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Selection of a suitable softstarter for application with conveyor belts

Comparison of starting methods // Conveyor belts can have a lot of different looks and directions of use. It is a typical constant torque load with low to high braking torque depending on how heavy it is loaded. Let’s take a look at the most common motor starting methods and then select the most suitable […]

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Few Good Tips For Estimating and Optimizing Pumping Energy Costs

Duration diagram // To help estimate pumping energy costs To compare different system and pumping equipment proposals and make an intelligent choice, three facts will need to be established: Will the process require varying flow rate, and, if so, must it be continuously variable or can flow rate be varied in steps? Can on-off batch pumping […]

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Comparison of Soft Starting and Frequency Converter Motor Starting

Soft starting A soft starter is, as you would expect, a device which ensures a soft starting of a motor. A softstarter has different characteristics to the other starting methods. It has thyristors in the main circuit, and the motor voltage is regulated with a printed circuit board. The softstarter makes use of the fact […]

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What To Check When Commissioning Variable Speed Drives

The purpose of commissioning VSDs The main purpose of commissioning VSDs is to ensure that: The AC converter and motor have been correctly installed and meet the wiring and safety standards such as IEC 60364 or Australian standard AS 3000. The power and motor cables are correctly sized, installed and terminated. All power cable shields […]

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Comparison of Motor Speed Control Methods

Why motor speed control? It is often desirable to control the motor speed, usually for reasons process control for such variables as flow or pressure. Such applications as fans and pumps often have varying output requirements, and control of the motor speed is more efficient than mechanically limiting the process output with such devices as […]

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Line Harmonic Currents – Adjustable Frequency Control Created

Nonlinear loads Nonlinear loads like adjustable frequency controls create line harmonics when connected to the AC power distribution system. These harmonic currents are a result of non-sinusoidal current, which is a characteristic of all adjustable frequency controls using diodes or silicon controlled rectifiers (SCRs) on the input. The control’s input current is composed of the fundamental sinusoidal current […]

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