User Guide

Note: If the IR compensation is set too high, unstable (oscillatory) operation will

result.

To Calibrate the IR Trimpot:

1. Run the motor at approximately 30 - 50% of rated speed at no load and

measure the actual speed.

2. Load the motor to the rated current. Adjust the IR trimpot so that the loaded

speed is the same as the unloaded speed measured in the previous step.

X. DIAGNOSTIC LEDs

The KBWS is designed with PC board mounted LEDs to display the control’s oper-

ational status.

A. Power On (PWR ON) – The PWR ON LED will illuminate green when the AC

line is applied to the control.

B. Overload (CL) – The CL LED will illuminate red when the control goes into cur-

rent limit, indicating that the current limit set point has been reached (established

by the CL trimpot setting and the selection of the Plug-In Horsepower Resistor®).

If the CL LED remains illuminated during normal control operation, a fault condi-

tion may exist. Possible causes for this condition are as follows.

1. Motor is overloaded. Check motor current.

2. Motor may be defective. Check motor for shorts or grounds.

3. CL may be set too low. Check setting of CL trimpot.