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AC Drives-Hybrid at Pack Expo 2013

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

Paul Heney, the editorial director at Design World, interviewed Richard Fritts of KB Electronics about the KB Hybrid Drive at PACK EXPO 2013 in Las Vegas. The Hybrid Drive combines digital technology with an analog interface providing the efficiencey and precision of a microprocessor with the ease and simplicity of an analog device.

Find out more about KB Hybrid Drives and AC Drives at:


Visit the Design World website at:


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



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