Adjustable Frequency Drive
June 2001
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The KBAC-24D Adjustable Frequency Drive from KB Electronics, Inc. is a variable speed control in a NEMA-4X/IP-65 washdown and watertight enclosure. It is designed to operate 208-230 V, three-phase a.c. induction motors through 3.6 A RMS. The sine wave coded Pulse Width Modulated (PWM) output operates at a frequency of 16 kHz, which is said to provide high motor torque, high efficiency, and low noise. Due to its user-friendly design, the device is reportedly easy to install and operate.

Tailoring to specific applications is accomplished via selectable jumpers and trimpot adjustments, which eliminate the computer-like programming required on other drives. However, for most applications, no adjustments are necessary. Features include adjustable RMS Current Limit and I2t Motor Overload Protection. In addition, Adjustable Slip Compensation is said to provide excellent load regulation over a wide speed range. Power Start delivers more than 200 percent motor torque to ensure start-up of high frictional loads. Electronic Inrush Current Limit (EICL) eliminates harmful a.c. line inrush current, and Adjustable Linear Acceleration and Deceleration make the drive suitable for soft-start applications. The Ride Through feature reportedly provides a smooth recovery to the previous set speed during a momentary power loss, and Regeneration Protection eliminates tripping due to rapid deceleration of high inertial loads.

Standard front panel features include diagnostic LEDs for power on and control status, a start/stop switch, and a main speed potentiometer. Other features include a barrier terminal block to facilitate wiring of the a.c. line and motor, adjustable trimpots (MAX, MIN, ACCEL, DECEL, COMP, CL, BOOST), and customer selectable jumpers (line voltage, motor horsepower, auto or manual restart modes, motor frequency, frequency multiplier, and fixed or adjustable boost). Optional accessories include a forward-stop-reverse switch, auto/manual switch, power on/off switch, signal isolator/run relay and a multispeed board. Quick-connect terminals are provided for easy installation of all accessories.

KB Electronics, Inc.


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