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Allen Bradley offers ControlLogix power supplies for the ControlLogix control systems with 1756 chassis. Collectively these power supplies are identified as ‘1756 ControlLogix power supplies.’ There are five types of power supplies, including ControlLogix standard AC, ControlLogix standard DC, ControlLogix-XT, ControlLogix redundant, and ControlLogix-XT redundant. These power supplies can provide DC power directly to the chassis backplane in the range of 1.2V, 3.3V, 5V, and 24V. This guide provides in-depth technical knowledge for the selection of ControlLogix power supplies. Allen Bradley ControlLogix There are six models of standard AC power supplies. Comparing the size, some of the models are wider than others. The slim variants of standard AC power supplies are low-capacity models, which include PA50 and PA50K. The large-size models are higher in capacity and include PA72/C, PA72K/C, PA75/B, and PA75K/B. Input Voltage and Frequency : The input voltage for the standard AC power...
A modular control system comprises a power supply, CPU, input/output modules, and an operator interface device. Modular controllers contain up to three input/output modules, including programmable logic controllers (PLCs), distributed I/O systems, actuators, or sensors, each used in various combinations depending on their intended purpose. SLC 500 Power Supply is made for Pollution Level 2 Industrial use in situations that have overvoltage Category II levels (as defined in IEC publication 60664-1). Up to 2,000 meters (6,561 feet), this equipment can still be classified as an industrial-grade Class A, Group 1 machine. This means that although there are occasional issues with EMC(electromagnetic compatibility) when using it in other environments, these complications can easily be avoided when the right precautions are taken. It is also supplied as an open type device. Anyhow, the user must use it with proper housing according to its environment. Allen Bradley PLC SLC 500 1746-HSRV Each...
In industry, servo motors provide precise position and speed control to assist various machine control operations. Industrial servos are mainly alternating current (AC) servos that control AC motors. The manufacturing and process industries are becoming fully automated, limiting human intervention in most tasks, thus increasing efficiency, safety, and quality. Mitsubishi’s AC Servo Systems (MELSERVO) has fulfilled industries’ demands for years by providing complete servo solutions. MELSERVO provides three types of control operations: position, speed, and torque corresponding to applications in warehouse management, spin coaters for the semiconductor industry, and industrial printers, respectively. The AC servos configuration comprises three devices; the servo amplifier, the servo motor, and the controller (exceptions exist). The servo amplifier works as the control unit, the servo motor acts as the drive unit, and the controller functions as the command unit. The controller provides...
The RX3i CPU series has only one standalone CPU (IC695CPE400 ). It functions independently, unlike other models which are usually plugged into a backplane. Two mounting possibilities are facilitated; mount on a DIN rail or install in a cabinet. The CPE400 is the latest and most advanced CPU with unmatched processing power, performance, and features. It has a quad-core 1.2 GHz AMD G-Series processor. The operating system in this CPU is VxWorks, similar to all other CPU variants. This CPU operates in a temperature range from -40°C to 70°C, unlike all others having a 0°C to 60°C operating temperature range. CPE400 has battery-backed 64 Mbytes of RAM and a similar capacity non-volatile flash memory. CPE400 has built-in non-switched and four switched RJ45 Ethernet ports. Additionally, it has an Embedded Field Agent (EFA) RJ45 Ethernet connector, the specialty of CPE400 alone. In contrast, all other CPU models support high-speed PCI and Serial module backplanes for data transfer. A user can...
The PowerFlex Human Interface Modules (HIMs) are used for configuring and monitoring of PowerFlex AC drives and their attached peripherals. These HIMs are available with most PowerFlex drives and come with a high-definition LCD. They support several languages and give practical explanations of parameters and events, so you don’t have to look through a handbook for specifics. This article discusses HIM’s features, types, components, and compatibility with AC drives. This information will help you to choose a suitable HIM for your application. HIMs are categorized into following categories. Allen Bradley 20-HIM-A3 Basic PowerFlex 7-Class HIMs: 20-HIM-A3 and 20-HIM-A5 are basic PowerFlex 7-class HIMs. 20-HIM-A3 is an LCD operator interface that is compatible with PowerFlex 70, 700, 700H, 700S, and 700L AC drives. This basic HIM features a liquid crystal display along with a full numeric keypad as an operator interface. You can either use this HIM as a hand-held device or mount it...
VFDs or Variable Frequency Drives are controller systems including motors that give varying output speed as per input command. The capacitor forms DC links the whole VFD system. The voltage across this DC link is an important parameter to be controlled. This voltage is input to the inverter and thus acts as a reference voltage in the system. Variations in DC link voltage or voltage across the capacitor impacts the speed and performance of motor greatly. The selection of capacitor is equally important as its size will define the ripple factor, noise, and smoothness in the running of the motor. While it is important to know the significance and working of capacitors in a drive system, let’s understand the basics of the drive system, associated terminologies, and common topologies. To understand the purpose of capacitors in VFDs, one should have an idea of the purpose of VFDs and their basic work topology. Variable Frequency Drives are electromechanical systems in which the speed and...
Allen Bradley’s PowerFlex 750 series of alternating current drives are available in a variety of enclosure ratings to meet a wide range of requirements as per the user’s application. It’s critical to pick the correct enclosure ratings for your drive since you don’t want your system to go down or production to be affected if your drive fails. Enclosures for drives are evaluated according to their compatibility for specific applications and how well they shield equipment. A number is assigned to each type of enclosure depending on its capacity to bear up environmental factors. For this drive’s series, enclosures have Ingress Protection (IP), NEMA, and UL Type classifications. We will look into the details of these standards, so you’ll know precisely what to look for while selecting a drive from the PowerFlex 750 series. We’ll only concentrate on available enclosures for these drives in this guide. Then, we will discuss possible enclosure codes – a combination of NEMA, IP, and UL...
Induction motors are extensively used for a variety of industrial and domestic applications. For industrial applications, three-phase AC motors are the most popular due to their simple and robust construction, high-power output, low maintenance requirements, high efficiency, and suitability to function reliably in any working condition. However, at standstill, the windings of such motors are characterized by a low impedance. They thus draw huge amounts of current during start-up to accelerate to nominal speed. This makes them prone to input current surge known as “inrush current”. A high inrush current is usually 5 to 8 times higher than the rated current of an induction motor at full load. And since induction motors are not designed to tolerate the high inrush, their windings can get quickly damaged which reduces the motor’s performance and lifespan. Also, high inrush currents are likely to cause a huge dip in the line voltage resulting in low levels of the supply voltage. This can...
VFD stands for Variable Frequency Drive. It is a type of motor controller that drives an electric AC motor by varying the voltage and frequency of its power supply. By adjusting the frequency of the AC voltage being supplied to the motor, the VFD is able to control the speed of the motor. This is possible because, Frequency, given in Hertz (Hz), is directly related to the motor speed given in Revolutions per minute (RPM). In other words, the faster the frequency of the supply voltage, the faster the motor speed in RPM. There are a variety of other names that may be used to refer to a Variable Frequency Drive (VFD), including: Adjustable Speed Drive Adjustable Frequency Drive Variable Frequency Drive Variable-Voltage Drive Variable Speed Drive(VSD) Frequency Converter Variable Frequency Inverter(VFI) AC Drive Microdrive Whatever the name used, a Variable Frequency Drive is always a type of motor controller used to drive and control electric AC motors. There are a variety of factory and...
Capacitor Value picoFarad (pF) nanoFarad (nF) microFarad (µF) milliFarad (mF) Farad (F) Inductor Value nanoHenries (nH) microHenries (µH) milliHenries (mH) Henries (H) Results Resonant Frequency (MHz) A Tank circuit is also called an LC circuit, a resonant circuit, or a tuned circuit. It is an idealized RLC electric circuit with zero resistance. It consists only of an Inductor (L) and a Capacitor(C), connected in a series or parallel configuration; hence the name LC circuit. Tank circuits are particularly useful due to their resonance property. They are implemented in a variety of electrical applications, such as frequency tuners, filters, and oscillators. In any AC (Alternating Current) circuit containing Resistance(R), Capacitance(C), and Inductance(L) elements, the voltage phase across the circuit and the current phase in the circuit are generally different. But if you adjust the parameter values of the L or C components or the power supply frequency, you can make the voltage and...
Maximum Current (Imax) Amps (A) Amps Voltage Volts (V) Volts Stepper Motor Inductance (L) milliHenry (mH) mH Steps Per Revolution Steps Steps Results Maximum Power Watts Minimum Time per Step ms Maximum Speed revolutions/second A stepper motor is simply an electromechanical device that converts electrical power into mechanical power. It is a popular type of brushless, synchronous electric motor that converts input discrete(digital) pulses into mechanical shaft rotations. It divides a full shaft rotation into an expansive number of precise movements called steps. If you drive a stepper motor using a DC power supply that is sequentially switched, then the rotor shaft of the stepper will consist of discrete angular movements with uniform magnitudes. Unlike other standard types of DC (Direct Current) motors which rotate continuously for an arbitrary number of spins until the DC voltage being supplied is turned off. Stepper motors are a type of discrete input-output device for precise...
A Soft Starter is a device that provides an alternative startup method to a typical AC motor with fewer power requirements at start-up. It reduces the amount of drawn inrush current and limits the motor starting torque; this helps reduce potentially damaging mechanical and electrical shocks on the motor system. When a soft starter is added to a motor’s circuit, it continuously regulates the motor’s supply voltage during the start-up phase. This means that the motor will gradually adjust to the machine’s load behavior. So, the soft starter provides the motor with a smooth acceleration up to full speed. This improves the operating behavior and lengthens the service life of your motor; it also smooths workflows. As the name suggests, soft starters are mainly used in the start-up phase of electric motors or other mechanical operating equipment. But they can also be used to stop, accelerate, reverse and protect such equipment. Moreover, they are used to reduce motor heating in case of...
No matter what industry you work in, you’ve almost certainly dealt with electrical components made by companies under the Eaton Corporation’s umbrella. Generations of industrial power and controls professionals have turned to Eaton for solutions, and as the Eaton family of companies continues to grow, we find ourselves handling products that our predecessors trusted all the same, just under different brand names. One of these evolving product families is found in Eaton’s SVX and HVX Adjustable Frequency Drives, previously sold under the Cutler-Hammer banner. In this article, we’ll update you on the current state of these still-relevant SVX and HVX drive models, as well as offer a comparison between their features. While most control hardware buyers know Eaton Corporation for its wiring, power distribution, and panel hardware products, the company has an extensive array of higher-level control and automation devices positioned to compete against industry giants Rockwell Automation and...
Modern industries need extremely compact and energy efficient variable frequency drives which ensure future configurability as well. EATON has introduced a variety of variable or adjustable frequency drives that can be used for HVAC, industrial, waste, and water treatment plants, etc. so machines could perform as per requirements. EATON’s SVX series brings about a wide range of variable frequency drives – equipped with sensorless vector control technique which makes these drives suitable for high speed applications that could also contain multiple drive systems. Other important features of this drive series are the presence of application-specific integrated circuits (ASIC), and an adaptive motor model to estimate real-time parameters. SVX drives are designed with three major modules, namely power module, control module, and keypad module – each of these having unique features and sub-modules or subsystems. Here, various important characteristics of SVX industrial variable frequency...
Newton-meters Foot-pounds Inch-pounds Newton-meters Foot-pounds Inch-pounds Torque is a measure of the force which can make an object rotate about an axis. In linear kinematics, the force causes an object to accelerate linearly, similarly, torque is what causes an object to acquire an angular acceleration. It’s a vector quantity, meaning it has both magnitude and direction. The direction of the torque vector depends on the direction of force acting on the rotational axis. In physics, torque is simply a twisting or a turning force. Different terminologies are used interchangeably to describe torque such as Moment or Moment of Force. We can say torque is a special case of Moment, as it relates to the rotational axis driving the rotation. On the other hand, for Moment to cause rotation, a driving external force is required. For any object to experiences torque, it must have a pivot point. If you have ever opened a door, then you have an intuitive understanding of torque. Torque is what...