Latest HVAC Technical Articles

This article investigates the basic components and wiring conventions for common three-phase motor starter…

This article investigates the basic components and wiring conventions for common three-phase motor starter configurations, including direct online, reversing, and star-delta.

Electrical and mechanical measurements are often labeled with "RMS" and "True RMS." Aside from the simple math…

Electrical and mechanical measurements are often labeled with "RMS" and "True RMS." Aside from the simple math definitions we learned in electronics class, why is this distinction actually important?

Have you ever heard of a relay? Of course you have. There are many different kinds, plus hundreds of different trade…

Have you ever heard of a relay? Of course you have. There are many different kinds, plus hundreds of different trade lingo names. What are some of the most common, and how do we use them?

Knowing what kind of control system to use: that’s a question that must be answered before setting up the factory…

Knowing what kind of control system to use: that’s a question that must be answered before setting up the factory floor. Why would someone choose pneumatic over electrical controls?

Within motors, two very different types of resistance are evident. The resistance of the windings is measured with a…

Within motors, two very different types of resistance are evident. The resistance of the windings is measured with a normal multimeter. But what is insulation resistance, and how is it measured?

In order to trace control system problems to the core, the ability to read and interpret various resources, from…

In order to trace control system problems to the core, the ability to read and interpret various resources, from facility-level diagrams to machine-level wiring layouts, is critical.

Controlling the startup of a motor not only reduces the wear on the motor, but eases the burden on the electrical supply,…

Controlling the startup of a motor not only reduces the wear on the motor, but eases the burden on the electrical supply, reducing infrastructure demands and the running cost of industrial loads.

Digital controls like VFDs and soft starts have advantages by elongating start time, but simple strategies for starting…

Digital controls like VFDs and soft starts have advantages by elongating start time, but simple strategies for starting motors with a reduced current draw, like star-delta (or wye-delta) are common.

It’s important to consider your PLC tag naming convention when using different styles. Learn when and why you might…

It’s important to consider your PLC tag naming convention when using different styles. Learn when and why you might even use more than one, depending on the circumstances and scope of your project.

We depend on circuit breakers all the time, even when you have a day off or work from home. These overcurrent protection…

We depend on circuit breakers all the time, even when you have a day off or work from home. These overcurrent protection devices keep machines running safely, reducing the risk of fires and arcing.

Rockwell Automation’s Allen-Bradley control hardware catalog has long included many series that start with 17xx, but…

Rockwell Automation’s Allen-Bradley control hardware catalog has long included many series that start with 17xx, but what are these lineups, and what function do they serve?

When we need to change the speed of an industrial motor, whether to control a process or save energy costs, we turn to…

When we need to change the speed of an industrial motor, whether to control a process or save energy costs, we turn to the variable frequency drive, better known simply as a VFD.

In this article, we will explore real-world considerations for strain gauge performance and typical applications. We’ll…

In this article, we will explore real-world considerations for strain gauge performance and typical applications. We’ll be talking about foil and wire strain gauges, but ignoring semiconductors.

Data pipelines are software services that progress the data from source to storage, hopefully without too much…

Data pipelines are software services that progress the data from source to storage, hopefully without too much programming complexity. In this article, we begin by initializing the mage.ai software.

Pressures are always rising and falling in fluid systems. Sometimes the changes are extreme and lead to damage. What…

Pressures are always rising and falling in fluid systems. Sometimes the changes are extreme and lead to damage. What causes problematic pressure changes, and how can you trace them to their source?

There are two types of winding designs inside three-phase industrial motors: Wye and Delta. Although the motors and…

There are two types of winding designs inside three-phase industrial motors: Wye and Delta. Although the motors and connections look similar on the outside, this article discusses the internal construction for Delta wound motors.

An overview of HMI data types, input controls, output indicators, and message functions, the building blocks used to…

An overview of HMI data types, input controls, output indicators, and message functions, the building blocks used to construct informative and appealing HMI applications.

Have you ever needed to know the temperature, pressure, flow, or other measurement on location, but the readout is way…

Have you ever needed to know the temperature, pressure, flow, or other measurement on location, but the readout is way off in the control room? Here’s an easy way to add a readout in the field.

A PLC can be placed in Run or Stop, or occasionally Program mode, usually through physical or virtual methods. But what…

A PLC can be placed in Run or Stop, or occasionally Program mode, usually through physical or virtual methods. But what do these modes mean, and when should they be used?