KB Electronics KBRC-240D - Manual (Page 22)

To reset the control after it has gone into TCL , momentarily set the Start/Stop switch to
the “START” position or disconnect and reconnect the AC line. See Figure 43, on page
21.
Resetting the Control after TCL – To reset the control after it has gone into TCL, set the
Start/Stop switch to the “STOP” position and then momentarily to the “START” position or
disconnect and reconnect the AC line. If the Start Switch is jumpered (START and RET
terminals connected) the control must be restarted by disconnecting and reconnecting the
AC line. If the Power On/Off Switch is installed, set it to the “OFF” position and then back
to the “ON” position.
To Calibrate the TCL Trimpot:
1. Run the motor at approximately 30 -50% of rated speed at no load.
2. With Jumper J8 set to the “TCL” position, set the TCL trimpot to the desired position
and lock the motor shaft.
3. Monitor the time it takes for the control to shut down.
4. If the TCL time is not as desired, reset the control and repeat steps 1 - 3.
Warning! When the control shuts down in TCL, the AC line voltage is still present in
the control.
Non-Timed Current Limit (NTCL) – When jumper J3 is set to the “NTCL” position and
an overload condition exists, the control will remain in current limit and will not shut down.
IX. DIAGNOSTIC LEDs
The KBRC-240D is designed with LEDs mounted on the front cover to display the control’s
operational status.
A. Power On (ON): The ON LED will illuminate green when the AC line is applied to the
control.
B. Stop (STOP): The STOP LED will illuminate yellow when the Start/Stop switch is set to
the “STOP” position. When the AC line is applied, this LED will also be illuminated until
the Start/Stop switch is momentarily set to the “START” position.
C. Overload (OL): The OL LED will illuminate red when the control goes into current limit,
indicating that the current limit set point has been reached (set by the CL trimpot and the
position of jumper J4). This LED will remain illuminated if the control times out in TCL
(Jumper J8 set to the “TCL” position).
The control can be reset by either setting the Start/Stop Switch to the “STOP” position
and then momentarily to the “START” position or by disconnecting and reconnecting the
AC line. If the overload condition still exists when the control is restarted or AC line reap-
plied, the OL LED will illuminate again. If the OL LED remains illuminated during normal
control operation, a fault condition may exist. Possible causes for this condition are as
follows.
1. Motor is overloaded. Check motor current. If the motor is a shunt wound type, the
field may be open or not receiving proper voltage.
2. Motor may be defective. Check motor for shorts or grounds.
3. CL may be set too low. Check position of CL trimpot and setting of jumper J4.
Note: In some applications, especially those requiring the motor to cycle on and off or
from one speed to another or from stop to high speed, the OL LED may blink, indicating
a transient overload. This may be a normal condition for the application.
X. OPTIONAL ACCESSORIES
Complete instructions and connection diagrams are supplied with all accessories to facilitate
installation.
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