The KB Electronics KBWS PWM (pulse width modulated) controls are designed to operate PWM and SCR rated Permanent Magnet motors ranging from 1/50 HP to 11/2 HP. They operate at a switching frequency greater than 16 kHz to provide high motor efficiency 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 line inrush current limiter (ICL) which reduces the AC line surge current during startup.

Standard features of the KBWS include diagnostic LEDs (Power On and Current Limit) and adjustable trimpots (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 Plug- In Horsepower Resistor matches the motor characteristics to the control which eliminates the need to recalibrate the Current Limit (CL) and IR Compensation (IR) trimpots.

The KBWS contains built-in isolation for all inputs. This includes signal voltage, Main Speed Potentiometer, Inhibit Circuit and +5VDC Power Supply. The dual voltage models contain a jumper to select motor voltage and special circuitry which automatically accepts AC line input voltages of 115 or 208/230 Volts AC without having to make a jumper selection.

Optional accessories for the KBWS include a DIN Rail Mounting Kit, a Product Safety Module (PSM) and an AC Line / Armature Fuse Kit.