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AC Drivers/Controllers/VFDs
AC Speed Controller

Anaheim Automation carries a broad line of rugged AC Variable Frequency Drives for OEM and Industrial applications, combining high performance and cost efficiency into one powerful package. Available in input voltages of 120V and 240V and capable of powering AC motors from 0.25 to 30Hp, these VFDs are great for normal duty and soft-start operation. Our variable frequency drives provide energy savings and increased efficiency, making them ideal for fan, pump, and HVAC applications. They are equipped with a number of different features such as momentary power loss restarts, flying starts, auto-acceleration/deceleration, and sensorless vector control. These features make the VFDs compatible with most AC motors and allow for flexibility within an application. If you require assistance in selecting the appropriate VFD for your application, please contact an Anaheim Automation Applications Engineer, we are happy to help.

Anaheim Automation offers a large selection of AC Speed Controllers that are priced with OEM applications in mind. These AC Motor Speed Controllers come in wide variety of power ranges from 6 watts to 536 HP.

AC Speed Controllers - The ACP-US series is a driver and motor combo that provides closed loop speed operation. It also provides a large LED display for monitoring motor RPM. ON/OFF switch easily provides the user to stop and run the motor when needed. These speed controllers are available in power ratings from 6W - 90W. The ACSD050 offer simple control for Universal, Shaded Pole, and Split-Phase Motors. The ACSD050 series has a compact package that can easily fit into existing systems and features quick disconnects for easy removal and maintenance.


  • Input Voltage: 120 or 240VAC
  • Max Power: 0.25 to 30.00 hp
  • V/F Control; Open-Loop Vector Control
  • Standard Equipped with Modbus and RS485 Communication
  • Built-in PID Control
  • Improve Efficiency of Variable Torque and Constant Horsepower Load Applications
  • Ideal for Fan, Pump, and HVAC Applications
  • Auto Torque Boost & Auto Slip Compensation Function
  • Input Range: 110VAC or 220VAC
  • Max Power: 6 to 600 Watts
  • Closed Loop Operation Available
  • RPM Display Available
  • Simple, Cost-Effective Design
  • Small Package Designs
  • Covers a Wide Range of Motor Applications
  • Customization is Available
Fundamentals of AC Drivers/Controllers

Helpful Information
Advantages
- Process temperature can be controlled without a separate controller - Low maintenance - Longer lifespan for your AC motor and other machinery - Lower operating costs - Equipment in your system that cannot handle excessive torque is protected

Applications
Variable Frequency Drives can be used in many different industrial and commercial applications. Most often used to control fans in air conditioning and heating systems, Variable Frequency Drives allow for more control of the airflow. Variable Frequency Drives also aid in adjusting the speed of pumps and blowers. More recent applications include conveyors, cranes and hoists, machine tools, extruders, film lines, and textile-fiber spinning machines.

Basics
Variable Frequency Drives are a particular kind of adjustable-speed drive that is used to control the speed of an AC motor. In order to control the motor’s rotational speed, Variable Frequency Drives control the frequency of the electrical power supplied to it. Adding Variable Frequency Drives to an application allows the motor speed to be adjusted in accordance with the motor’s load, ultimately saving energy. Commonly used in a myriad of applications, Variable Frequency Drives can be found operating ventilation systems, pumps, conveyors and machine tool drives.

Components of Variable Frequency Drives
Typically, Variable Frequency Drives consist of three basic parts: the rectifier, and inverter, and a DC link to connect the two. The rectifier converts AC input into DC (direct current), while the inverter switches the DC voltage to an adjustable frequency AC output voltage. The inverter can also be used to control output current flow if needed. Both the rectifier and inverter are directed by a set of controls to generate a specific amount of AC voltage and frequency to match the AC motor system at a given point in time.

History
Nikola Tesla invented the first AC Induction Motor in 1888, introducing a more reliable and efficient motor than the DC motor; however, AC speed control was a challenging task. When precise speed control was required, the DC motor became a replacement for the AC motor, because of its efficient and economical means of controlling speed accurately. It wasn’t until the 1980’s that Variable Frequency Drives became a competitor. Over time, Variable Frequency Drives technology eventually transformed into an inexpensive and reliable competitor to the traditional DC control. Now, Variable Frequency Drives are capable of speed control with full torque attained from 0 RPM through the maximum rated speed.

How Variable Frequency Drives Works
When complete voltage is applied to an AC motor, it accelerates the load and drops torque initially, keeping current especially high until the motor reaches full speed. Variable Frequency Drives operate differently; they eliminate excessive current, increasing voltage and frequency in a controlled manner as the motor starts. This allows the AC motor to generate up to 150% of its rated torque, which could potentially be generated from the beginning, all the way up to full speed, without wasting energy. Variable Frequency Drives convert power through three different stages. Firstly, AC power is converted to DC power, followed by the switching on and off of the power transistors, causing a voltage waveform at the desired frequency. This waveform then adjusts output voltage according to the preferred designated value.

Physical Properties
Typically, Variable Frequency Drives involve an AC motor, controller, and operator interface. The three-phase induction motor is most commonly applied to Variable Frequency Drives because it offers versatility and cost-effectiveness in comparison to a single-phase or synchronous motor. Though they can be advantageous in some circumstances, Variable Frequency Drives often utilize motors that are designed for fixed-speed operation. Variable Frequency Drives operator interfaces allow for the user to adjust operating speed, and start and stop the motor. The operator interface might also allow the user to switch and reverse between automatic control, or manual speed adjustment.

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