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AC Drive for a Portable Duct Cleaner

KB Electronics, Inc. Manufacturer of AC Drives, DC Drives & Variable Speed Controls


A portable duct cleaner is designed to perform source removal duct cleaning inside various types of structures including homes, hospitals and commercial high-rises. Compared to clumsy van or truck-mounted units, this portable system offers exceptional flexibility needed to access and clean air handling systems on the first floor or the fifty-first floor.

The duct cleaner is a vacuum that is attached directly to the air handling system within the building. The vacuum produces a powerful airflow in the duct that pulls dirt and debris into the filtration system. As the vacuum operates, the filter begins to clog with debris which increases the AC line current. The application required that maximum air flow be maintained during this process without nuisance tripping of the circuit breaker.

An AC drive is needed to monitor and adjust the motor speed as the filter begins to clog. The drive must be simple to operate, capable of working with both 15 AMP and 20 AMP circuits, and be GFCI compatible. The drive was required to be mounted inside the duct cleaning unit and able to withstand vibration.

KB Solution:

KB engineers selected model KBAC-24D with custom software for this application. The drive was configured to operate with GFCI’s and was designed to be jumper selectable for both 15 AMP and 20 AMP circuits.

The KBAC uses a custom software algorithm to automatically maximize the vacuum performance without tripping the circuit breaker. The software monitors the AC line current and adjusts the motor speed to keep the current below the circuit breaker rating. This allows the duct cleaner to maintain maximum airflow as the filter begins to clog.  An on board indicator alerts the operator when to change the filter.

In addition to the custom software, the standard NEMA 4X enclosure was modified to allow the drive to be installed within the allotted space in the equipment. In order for the drive to withstand the shock and vibration during use, the application required that a silicon compound be used to secure several of the components. 

KBAC 24D AC Drive for a Portable Duct Cleaner


Fall Training Dates

KB Electronics, Inc. Manufacturer of AC Drives, DC Drives & Variable Speed Controls

We are pleased to announce the availability of training at our Coral Springs factory this fall. Training includes Penta Power and KB Genesis products. Training sessions are held in our on-site classroom. This classroom is equipped with lab benches and offers “hands on” learning of models of our speed controls, complete with metering and motors. Each class can accommodate up to eight students.

The two day class includes the basics of AC & DC motor speed controls. The course covers all our models, VFD, SCR, PWM and Battery. An agenda for the class can be found on the following page. Tours of the KB Factory and Engineering Department are also included.

This training is designed for outside and inside distributor sales personnel. The students will learn how to specify and sell all of our products. Extensive discussion of typical applications will be included. Course materials given to students will include distributor binders.

Training Dates:

October 10 & 11, 2013    Thursday 8:30AM to Friday 3:00PM

November 7 & 8, 2013     Thursday 8:30AM to Friday 3:00PM

December 5 & 6, 2013    Thursday 8:30AM to Friday 3:00PM

Additional Details


Variable Speed Control for Pumps

KB Electronics, Inc. Manufacturer of AC Drives, DC Drives & Variable Speed Controls

This advertisement appeared in Pumps & Systems Magazine featuring variable speed AC and DC Motor Drives designed to control pumps.

Variable Speed Controls for Pumps

 Advertisement for variable speed controls, AC Drives and DC Drives in Pumps & Systems magazine.



What is motor overload protection?

KB Electronics, Inc. Manufacturer of AC Drives, DC Drives & Variable Speed Controls

KB’s AC drives contain Motor Overload Protection (I²t) with RMS Current Limit (CL). The I²t function provides overload protection and prevents motor burnout. KB’s AC drives are UL approved as an electronic overload protector for motors.

With I²t, if the motor is overloaded to 120% of the motor nameplate rating, the I²t timer will start, triggering the drive to trip in 30 minutes. As the motor continues to experience an increase in load, the time it takes the drive to trip decreases.

Finally, if the motor is overloaded to 160%, the drive will trip in six seconds. The CL factory settings are for a maximum overload of 160%, limiting the motor current and torque.

Some drive manufacturers do not have the current limit feature. During an extreme overload the I²t time is very short, which will cause an undesirable nuisance trip.

Motor Overload Protection



Introducing a new KBDF Series Digital AC Drive

KB Electronics, Inc. Manufacturer of AC Drives, DC Drives & Variable Speed Controls

KB Electronics, Inc. expands their AC Drive product line with the addition of the KBDF Digital Drive Series.

Coral Springs, FL-May 13, 2013- KB Electronics, Inc. of Coral Springs, FL, a manufacturer of AC drives and DC drives from fractional through 5 horsepower expand their AC drive product offering with new digital drives.

The KBDF Series of Adjustable Frequency Drives consist of fourteen inverter models rated for 1/8 to 5 horsepower motors. Drives are available for AC, PMSM, DC brushless, PSC, Shaded Pole, Universal and EC motors. These drives are housed in IP 20 enclosures and are available with a built-in CE approved AC Line Class “A” Industrial Standard RFI (EMI) Filter.

“We are pleased to continue to expand our AC drive offering." reports Alan Bueller, vice president sales, KB. “These digital drives allow us to offer models rated to 5 horsepower motors with a digital display and LED light indicators.”

These are ideal for OEM applications where digital programming and displays are required.

The common sense programming (CSP) organizes parameters into easy to understand intuitive groups.

The proprietary current limit software provides overload protection, prevents motor burnout and eliminates nuisance tripping.

It is UL approved as an electronic overload protector for motors.

The KBDF drive offers energy savings, using only the power the application requires.

Replacing constant speed with variable speed will significantly reduce energy costs.

GFCI software allows the equipment to operate with Ground Fault Circuit Interruption circuit breakers or outlets.

Download a copy of the KBDF Product Brochure 

KBDF Series Digital AC Drive

About KB Electronics, Inc.

Since 1967, KB Electronics, Inc. has dedicated itself to manufacturing the best AC drives and DC drives. KB manufacturers and inventories, in the United States, over 200 control models to serve the fractional to 5 horsepower market. KB’s distribution includes over 800 distributor locations in over 30 countries. The company prides itself in being able to provide customization to any of their motor drive products, thereby allowing their customers to purchase a product specific to their application. For more information on KB Electronics, Inc. please visit www.kbelectronics.com.


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