Category Archive for: «Automation»

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3 Conditions That Can Damage Your PLC

PLC in adverse conditions In certain applications, the operating environment may have extreme conditions that require special attention or otherwise can seriously damage PLCs. These adverse conditions include excessive noise and heat and nuisance line fluctuations. This article describes these conditions and provide measures to minimize their effects. Excessive noise Excessive heat Nuisance line fluctuations […]

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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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PLC Latch (Flip-Flop) Logic Function – Like a Sticky Switch!

Typical events used by a PLC More complex systems cannot be controlled with combinatorial logic alone. The main reason for this is that we cannot (or choose not to) add sensors to detect all conditions. In these cases we can use events to estimate the condition of the system. Typical events used by a PLC […]

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Installing Sensors Incorrectly As a Mistake #2 In Instrumentation

Four Sensor ‘Poors’ To Avoid Generally speaking, there are four ‘Poors’ that can lead to incorrectly installing instrumentation sensors: Poor placement Poor control Poor protection Poor grounding Each of above sensor ‘poors’ are described below, and by the way… have you read what is the mistake No.1 in an industrial instrumentation? 1. Sensor Placement The best sensor […]

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Selecting Wrong Sensor As a Mistake #1 In Instrumentation

Instrumentation issues Despite ongoing advancements in measurement technology, instrumenting a process for feedback control remains a technical challenge. Today’s sensors are certainly more sophisticated than ever before, and fieldbus technology has simplified many installation issues considerably. Nonetheless, much can still go wrong with an instrumentation project. Selecting the wrong sensor Technology mismatch // Although it’s […]

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4 Steps To Follow During Commissioning of a PLC System

PLC programs are never final… Yes, PLC programs are never final, it is always possible to make corrections and subsequent adaptations to new system according the customer requirements. Even during commissioning, program changes are often necessary. The commissioning of a system can be divided into four steps: Checking the hardware Transferring and testing the software […]

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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 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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