KB Electronics KBMA-24DF - Manual (Page 6)

3 INTRODUCTION
Thank you for purchasing the KBMA Adjustable Frequency Drive. KB Electronics, Inc. is committed to providing
total customer satisfaction by producing quality products that are easy to install and operate. The KBMA is
manufactured with surface mount components incorporating advanced circuitry and technology. The KBMA
Series Adjustable Frequency Drives are variable speed controls housed in a NEMA-1 / IP-40 enclosure. They are
designed to operate 208 – 230 Volt 50 & 60 Hz 3-phase AC induction motors from 1/8 HP thru 1 HP. The sine
wave coded Pulse Width Modulated (PWM) output operates at a carrier frequency of 16 kHz which provides high
motor efficiency and low noise. Adjustable Linear Acceleration and Deceleration make the drive suitable for
soft-start applications. The Motor Horsepower Selection Jumper allows the drive to be used on a wide range of
motor horsepower (1/8, 1/4, 1/2, 3/4, 1 HP) without recalibration or programming. Model KBMA-24DF contains a
built-in AC line Class A RFI (EMI) filter which meets the CE Council Directive 89/336/EEC Industrial Requirement.
Its user-friendly design makes the KBMA easy to install and operate. Setting the drive to specific applications is
accomplished with selectable jumpers and trimpots, which eliminates the computer-like programming required on
other drives. However, for most applications no adjustments are necessary. For more advanced programming, PC
based Drive-Link™ software is available.
Main features include adjustable RMS Current Limit and I 2 t Motor Overload Protection. 1 In addition, Adjustable
Slip Compensation with Static Auto-Tune and Boost provides high torque and excellent load regulation over a
wide speed range. Power Start™ delivers over 200% motor torque to ensure startup of high frictional loads.
Electronic Inrush Current Limit (EICL™) eliminates harmful AC line inrush current. A Run/Fault Relay is provided,
which can be used to turn on or off equipment or to signal a warning if the drive is put into the Stop Mode or a
fault has occurred.
Standard front panel features include an On/Off AC Line Switch, a pilot light for power on, and a Main Speed
Potentiometer. Other features include PC board mounted diagnostic LEDs (Power On (ON), Drive Status (ST) and
Overload (OL)), Barrier Terminal Blocks to facilitate wiring (AC line, motor, ground (earth), and Run/Fault Relay
Output Contacts), adjustable trimpots (MIN, MAX, ACCEL, DECEL, COMP, CL), customer selectable jumpers (AC
Line Input Voltage Selection, Motor Horsepower, Automatic or Manual Start and Reset 2 , Motor Frequency,
Frequency Multiplier, and a Run/Fault Output Relay).
Optional accessories include: Forward-Stop-Reverse Switch 2 , AC Line Filter, and Programming Kit.
Notes: 1. UL approved as an electronic overload protector for motors. 2. The optional Forward-Stop-Reverse
Switch is required for Manual Start.
3.1 STANDARD FEATURES
• Simple to Operate – Does not require programming. Uses trimpots and jumpers, which are factory set
for most applications.
• Dual AC Line Input Voltage (115 or 208/230 Volt AC Operation) – Controls 208 – 230 Volt AC, 50
& 60 Hz, 3-phase motors from 115 or 208/230 Volt AC line. (Jumper J1 must be installed for 115 Volt
AC line operation.)
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This product complies with all CE directives pertinent at the time of manufacture. Contact our Sales
Department for Declaration of Conformity. Installation of a CE approved RFI filter is required. See RFI
Filters & Chokes Selection Guide D-321 (Part No. A42027) for selection of filters to meet the Industrial or
Residential Standard. Additional shielded cable and/or AC line cables may be required along with a signal isolator.