KB Electronics KBPI-240DR - Manual (Page 21)

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CAUTION:
1. Adjusting the CL above 150% of motor rating can cause overheating and
demagnetization of some PM motors. Consult motor manufacturer.
2. Do not leave the motor in a locked condition for more than a few seconds since
armature damage may occur.
D. IR Compensation (IR) – The IR Comp circuit is used to stabilize motor speed under
varying loads. Readjust the IR trimpot as follows:
1. Run the motor at approximately 30-50% of rated speed under no load and measure
actual speed.
2. Load the motor to rated current. Rotate IR trimpot so that the loaded speed is the
same as the unloaded speed measured in 1.
Control is now compensated so that minimal speed change will occur over a wide range of
motor load. [Note: Too much IR Comp will cause unstable (oscillatory) operation.]
XII. FUNCTION INDICATOR LAMPS.
The control contains three LED Indicator Lamps on the front cover that reflect its operational
status.
A. Power On Indicator (ON) – This lamp will glow GREEN when the AC line is connected
to the control. (Note: As a convenience, an additional power on indicator (Green) is
located on the main printed circuit board.)
B. Stop Indicator (STOP) – This lamp will glow YELLOW when the control is placed in the
STOP mode with the Run, Jog/Stop Switch or logic contact.
C. Overload Indicator (OL) – When the motor is loaded to the current limit setpoint (CL
setpoint is established by the setting of jumper J1 and the CL trimpot) this lamp will glow
RED. If the OL indicator remains lit during control operation, a fault condition may exist.
Possible causes for this condition are as follows:
1. Motor is overloaded - check motor amps with DC ammeter in series with armature.
2. Motor may be defective - check motor for shorts or grounds.
3. The CL may be set too low - check position of jumper J1 and CL trimpot.
Note: In some applications, especially those requiring the motor to cycle on and off
or from one speed to another, the OL indicator may blink indicating a transient
overload. This is a normal condition for the application.