Category Archive for: «Automation»

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When to Buy Premium Efficiency Motors?

Reducing Operating Costs Using premium efficiency motors can reduce your operating costs in several ways. Not only does saving energy reduce your monthly electrical bill, it can postpone or eliminate the need to expand the electrical supply system capacity within your facility. On a larger scale, installing efficiency measures allows electrical utilities to defer building expensive new generating plants, resulting in lower […]

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PLC Implementation Of Forward/Reverse Motor Circuit With Interlocking

Forward/Reverse Motor Interlocking Figure 1 illustrates a hardwired forward/reverse motor circuit with electrical and push button interlockings. Figure 2 shows the simplified wiring diagram for this motor. The PLC implementation of this circuit should include the use of the overload contacts to monitor the occurrence of an overload condition. The auxiliary starter contacts (M1 and […]

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Characteristics And Work Principles of Switched Reluctance (SR) Motor

SR Motor Characteristics The Switched Reluctance (SR) motor is very different from the other polyphase machines described because both the stator and the rotor have salient poles. The motor can only be used in conjunction with its specific power converter and control, and consequently only overall characteristics are relevant. The intuitively straight forward principle of […]

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Automation Migration Strategy in 3 Phases

Evolving the manufacturing systems Owing to competitive pressures in the marketplace, a company often needs to introduce a new product in the shortest possible time. The easiest and least expensive way to accomplish this objective is to design a manual production method, using a sequence of workstations operating independently. The tooling for a manual method […]

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14 energy-efficiency improvement opportunities in pumping systems

Detailed energy assessment Pump systems consist of pumps, driver, pipe installation and controls (such as ASDs or throttles) and are a part of the overall motor system. Below some of the energy efficiency opportunities for the pumping system are presented. Also, American Society of Mechanical Engineers (ASME) has published a standard that covers the assessment […]

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10 Things to Consider When Selecting a High Quality Medium Voltage Drive

10 Considerations to Identify Medium voltage drives have been available for over 35 years, but have only recently achieved very high reliability and simplicity within the past few years. Below are 10 considerations on how I would go about specifying and selecting a very high quality medium voltage drive based on my 35 years of […]

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A Few Words About Selecting AC Induction Motors for Cement Plant Applications

Introduction This technical article relies on the great paper written by Barton J. Sauer (Siemens Energy & Automation) which goes into essence of selecting the proper AC motor for cement plant applications. Although motors may appear to be the least complicated component in the specification of cement mill equipment, this article shall try to demonstrate that cement plant […]

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PLC application for reduced voltage-start motor control

Reduced-voltage-start motor control circuit Figure 1 shown below illustrates the control circuit and wiring diagram of a 65% tapped, autotransformer, reduced-voltage-start motor control circuit. This reduced voltage start minimizes the inrush current at the start of the motor (locked rotor current) to 42% of that at full speed. In this example, the timer must be set to […]

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Effects of Speed Variation on Rotodynamic Pumps

Varying the rotational speed A rotodynamic pump is a dynamic device with the head generated by a rotating impeller. Thus, there is a relationship between impeller peripheral velocity and generated head. Peripheral velocity is directly related to shaft rotational speed, for a fixed impeller diameter. Varying the rotational speed therefore has a direct effect on […]

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10 Strategies for Automation and Production Systems

Understand, simplify and automate the process Following the USA Principle is a good first step in any automation project. The USA Principle is a common sense approach to automation projects. Similar procedures have been suggested in the manufacturing and automation trade literature, but none has a more captivating title than this one. USA stands for: […]

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