Transcript:
[0m:00s] Hey there, I'm Mitchell, and welcome to another video in the RSP Educational Series. Today, we're going to talk about basic electrical elements and how electricity powers everything in industrial automation, from tiny sensors to massive motors. But do you really understand the fundamental building blocks behind it? If you want to master electrical systems, you need to know volts, amps, ohms, watts, joules, and more. In this video, we’re going to focus specifically on voltage and how it’s crucial to the foundation of electric flow. Whether you’re troubleshooting automation equipment or designing industrial control panels, understanding these concepts is critical to working with electrical systems. As always, if you like this kind of content and want more educational videos, please like and subscribe. This video is for educational purposes only. Always consult a professional for your application. RSP Supply is not liable for any misuse of this information. With that said, let’s get right into it.
[1m:03s] Voltage is the electrical pressure that pushes current. It’s often abbreviated as V or volts. In industrial automation, voltage is a critical parameter that determines the operation and safety of control systems, motors, sensors, and power distribution networks. It’s the driving force behind electrical signals and power delivery that ensures automated systems function reliably. It’s important to understand that voltage is always relative. It’s measured between two points, not at a single location. For example, a voltage of 120 volts in an electrical system means that one point is 120 volts higher than another point, usually ground or neutral. A 9-volt battery means the positive terminal is 9 volts higher than the negative terminal, while a 120-volt outlet means the hot wire is 120 volts higher than neutral or ground.
[2m:01s] Think of voltage like pressure in a water hose. The more water in the tank, the higher the pressure pushing water through the hose. When you open the nozzle, water flows because of this pressure. Too much water pressure can burst a hose, and too much voltage can damage electrical devices. That’s why we always use the correct voltage for each application. In automation, electrical power is supplied at different voltage levels depending on the application. Common ratings for low voltage include 24 volts DC, 120 volts AC, or 240 volts AC. These are used for control circuits, PLCs, sensors, and actuators. For example, a 24-volt DC power supply provides control power to a PLC in a control panel.
[3m:00s] Electricity is delivered in two main forms: alternating current (AC) and direct current (DC). They behave differently, which makes each useful in specific situations. Direct current flows in one direction and provides a constant voltage level, like water moving in a straight pipe. A 24-volt DC sensor in an automation panel receives a steady voltage to ensure reliable operation. Alternating current changes direction periodically. In the United States, AC voltage reverses direction 60 times per second, or 60 hertz. AC is better for transmitting power over long distances with less energy loss, which is why it’s used for power grids, industrial equipment, and high-voltage motors. A 480-volt AC motor in a manufacturing plant runs on alternating current because it’s more efficient for large loads.
[4m:29s] Understanding the difference between AC and DC is essential in industrial automation because different systems require different power types. For example, sensors and PLCs often use lower DC voltages, while motors and transformers, which demand higher power, typically operate on AC. Voltage also plays a key role in motor control. Variable frequency drives (VFDs) and soft starters adjust motor speed and torque by regulating voltage and frequency. For instance, a VFD reduces voltage when starting a pump to lower inrush current and prevent damage. Motor starters and contactors use control voltage, typically 24 volts DC or 120 volts AC, to switch higher power circuits such as 480-volt AC on and off.
[5m:09s] There are a few important considerations when working with voltage in industrial automation. Long cable runs can lead to voltage drops, which may require thicker cables or local power sources. Isolation and protection are also critical. Devices like surge protectors, fuses, and circuit breakers prevent damage from voltage spikes. Power quality is another concern. Automation systems often use uninterruptible power supplies (UPS) or industrial power conditioners to maintain stable voltage levels. Safety is equally important, as higher voltages require proper lockout and tagout procedures along with personal protective equipment.
[6m:00s] In industrial automation, voltage determines power availability, control signal integrity, and equipment operation. Whether it’s 24 volts DC for PLCs, 120 volts AC for control circuits, or 480 volts AC for motors, understanding voltage ensures proper system design, troubleshooting, and safety. That wraps up our dive into voltage, one of the most fundamental concepts in electrical systems. This is just the beginning of our foundational concept series, where we’ll explore other essential elements of electricity such as amps, ohms, watts, and joules. Each plays a crucial role in industrial automation, control systems, and power distribution. As always, for hundreds of thousands of other industrial automation products, visit our website. For more information and other educational videos, go to RSPSupply.com, the internet’s top source for industrial hardware.