KB Electronics KBIC-240DS - Manual (Page 6)

6
3 INTRODUCTION
Thank you for purchasing the KBIC ® "Standard of the Industry" DC motor speed controls. The speed
controls are designed for applications demanding good performance, high reliability and low cost. The
controls are fabricated with components that have proven reliability, including MOV transient protection,
which is used to protect the Power Bridge. Integrated circuitry is used to provide an uncomplicated design
with superior load and line voltage regulation. The Direct-Fed™ current limit circuit protects the motor and
control against overloads by limiting the maximum level of output current. It also prevents motor failure
due to demagnetization of the magnets of PM motors. Acceleration start (adjustable from 0.5 to 4
seconds) provides a smooth start each time the AC power is applied.
A unique feature of the KBIC ® control is the Plug-in Horsepower Resistor ® . It eliminates the need to
recalibrate IR Comp. and CL when the control is used over a wide range of motor horsepower. Additional
versatility is achieved by using the Auxiliary Heat Sink (optional) which is used to double the horsepower
rating of each model. The output of the control is a linear function of potentiometer rotation. The KBIC
®
can also be operated in a voltage following mode by supplying an isolated analog signal (0-7 VDC) to the
input terminals P2 (+) and F-. If an isolated input signal is not available, the optional Barrier Terminal
Board Signal Isolator (SI-5) can be used. The controls are terminated as standard with Q-D terminals
provided. A Barrier Terminal Board is available, which includes both line and armature fuse holders.
The Inhibit™ circuit (Terminals I1 and I2) are provided to electronically disconnect the armature output
voltage. Another standard feature is Auto Inhibit. This circuit prevents false starts and high surge currents
when cycling the KBIC
® control with the AC line. All models are UL Listed for the USA and Canada and
are CE approved.
4 APPLICATION INFORMATION
4.1 Motor Type – The KBIC ® is designed for Permanent Magnet (PM), Shunt Wound and Universal
(AC/DC) motors. Controls operated on 115 volt AC inputs are designed for 90 volt SCR rated motors.
Controls operated on 230 volt AC inputs are designed for 180 volt SCR rated motors. Use of higher
voltage motors will result in reduction of available maximum (MAX) speed (Trimpot Adjustment). Also,
if motor is not an SCR rated type, the actual AC line amperage at full load should not exceed the
motor's DC nameplate rating.
4.2 Torque Requirements – When replacing an AC induction motor with a DC motor and speed control,
consideration must be given to the maximum torque requirements. The full load torque rating of the
DC motor must be equal to, or greater than, that of the AC motor.