Category Archive for: «Automation»

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What can a PLC do? Why do we use them?

The meaning of PLC… “PLC” means “Programmable Logic Controller”, that’s clear. The word “Programmable” differentiates it from the conventional hard-wired relay logic. It can be easily programmed or changed as per the application’s requirement. The PLC also surpassed the hazard of changing the wiring. The PLC as a unit consists of a processor to execute the […]

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Let’s develop the simple PLC program for lighting control system

Lighting control system A lighting control system is to be developed. The system will be controlled by four switches, SWITCH1, SWITCH2, SWITCH3, and SWITCH4. These switches will control the lighting in a room based on the following criteria: Any of three of the switches SWITCH1, SWITCH2, and SWITCH3, if turned ON can turn the lighting […]

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5 Most Common Motor Load Types

Load profile (speed range, torque and power) Certain load types are characteristic in the industrial world. Knowing the load profile (speed range, torque and power) is essential when selecting a suitable motor and frequency converter for the application. Some common load types are shown. There may also be combinations of these types. Constant Torque Quadratic […]

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Basics of Built-in Motor Protection for Beginners

Why is motor protection necessary? In order to avoid unexpected breakdowns, costly repairs and subsequent losses due to motor downtime, it is important that the motor is fitted with some sort of protective device. This article will deal with built-in motor protection with thermal overload protection to avoid damage and breakdown of motor. The built-in […]

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Motor Connection for Clockwise and Counterclockwise Direction of Rotation

Star-delta (Y-Δ, wye-delta) starting Star-delta (in North America the designation “wye-delta” is commonly used instead) starting is the simplest method for reducing the starting current of a motor. The technique can be used with all squirrel-cage induction motors that are delta-connected for normal operation and whose windings ends are individually connected to terminals. The reduction […]

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Field Data Interface Devices as Eyes and Ears of a SCADA System

It’s all about information // Field data interface devices form the “eyes and ears” of a SCADA system. Devices such as reservoir level meters, water flow meters, valve position transmitters, temperature transmitters, power consumption meters, and pressure meters all provide information that can tell an experienced operator how well a water distribution system is performing. […]

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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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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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