Category Archive for: «Automation»

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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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Purpose and Working Principle of Inductive Sensors

Inductive sensors use currents induced by magnetic fields to detect nearby metal objects. The inductive sensor uses a coil (an inductor) to generate a high frequency magnetic field as shown in Figure 1 below. If there is a metal object near the changing magnetic field, current will flow in the object. This resulting current flow […]

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PLC implementation of the bottle-filling application

Detection of position In this example (see Figure 1), we will implement a control program that detects the position of a bottle via a limit switch, waits 0.5 seconds, and then fills the bottle until a photosensor detects a filled condition. After the bottle is filled, the control program will wait 0.7 seconds before moving to […]

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Let’s start learning the PLC programming

Introduction For managing and control of the electrical systems there once were used electromechanical relays. In time as tehnology advanced came and PLC devices (Programable Logics Controlers). Also there is the finance aspect since now PLC are cheaper then relays. PLC Components Every PLC is consists from a couple components. Each manufacturer gives his combination […]

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