User Guide

I. INTRODUCTION

Thank you for purchasing the KBWS. KB Electronics, Inc. is committed to providing

total customer satisfaction by producing quality products that are easy to install and

operate. The KBWS is manufactured with surface mount components incorporating

advanced circuitry and technology.

The KBWS PWM (pulse width modulated) controls are designed to operate PWM

and SCR rated Permanent Magnet motors ranging from 1/50 HP to 1

⁄2 HP. They

operate at a switching frequency greater than 16 kHz to provide high motor efficien-

cy and quiet operation. Another advantage of PWM is higher output voltage (up to

130 Volts DC for 115 Volt AC line and 220 Volts DC for 208/230 Volt AC line) which

provides increased motor speed.

The KBWS contains pulse-by-pulse current sensing, which provides short circuit

protection and prevents control damage due to commutator arcing. Permanent

magnet motor demagnetization is completely eliminated because current peaks are

reduced to safe levels. The controls contain an AC inrush current limiter (ICL) which

reduces the AC line surge current during cycling of the AC line.

Standard features of the KBWS include diagnostic LEDs for Power On and Current

Limit indication. Other features include adjustable trimpots for maximum speed,

minimum speed, acceleration, deceleration, current limit and IR compensation. Also

provided is a connector for an Inhibit Switch and quick-connect terminals for AC line,

motor armature and Main Speed Potentiometer. The KBWS can be operated from

a two wire start/stop circuit or can be started from the AC line.

Due to its user-friendly design, the KBWS can be easily tailored to specific applica-

tions. See Table 1 on page 10, for electrical ratings. The Plug-In Horsepower

Resistor® matches the motor characteristics to the control without having to recali-

brate the Current Limit (CL) and IR Compensation (IR) trimpots. Therefore, for most

applications, no adjustments are necessary.