D. Minimum Speed (MIN) –
Sets minimum speed of the motor. The MIN trimpot is factory
set for 0% speed. For a higher minimum speed setting, rotate the trimpot clockwise.
E. Jog Speed (JOG) –
Sets “jog” speed of the motor. The JOG trimpot is factory set for 15%
of motor base speed. For a higher jog setting, rotate the trimpot clockwise. For a lower
jog setting, rotate the trimpot counterclockwise.
Note:
The Jog feature requires installation of the Run-Stop-Jog Switch assembly (P/N
9340).
F. Current Limit (CL) –
Sets current limit (overload), which limits the maximum current to
the motor. The current limit set point is established by the setting of jumper J2 and the
setting of the CL trimpot. The CL trimpot is factory set for 150% of J2 range setting. For
a higher current limit setting, rotate the trimpot clockwise. For a lower current limit setting,
rotate the trimpot counterclockwise. Two modes of current limiting operation are provid-
ed: Non-Timed Current Limit (NTCL) and Timed Current Limit (TCL). See Section IVC,
on page 10.
CAUTION!
Adjusting the CL above 150% of motor rating can cause overheating and
demagnetization of some PM motors. Consult the motor manufacturer. Do not leave the
motor in a locked condition for more than a few seconds since armature damage may
occur.
G. Timed Current Limit (TCL) –
Sets the time for the control to shut down after being in cur-
rent limit (provides electronic motor overload protection). The TCL trimpot is factory set
for 5 seconds. For increased TCL time, rotate the trimpot clockwise. For decreased TCL
time, rotate the trimpot counterclockwise. If the control remains in CL for a predetermined
amount of time (set by the TCL trimpot and if jumper J3 is in the “TCL” position), the con-
trol will shut down. To reset the control after it has shut down, momentarily set the
start/stop switch to the “START” position or disconnect and then reconnect the AC line.
Warning!
When the control shuts down in TCL, the AC line voltage is still pres-
ent in the control.
H. Non-Timed Current Limit (NTCL) –
When jumper J3 is set to “NTCL” position and an
overload condition exists, the control will remain in current limit.
I. IR Compensation (IR) –
Sets the amount of compensating voltage required to keep the
motor speed constant under changing loads. The IR trimpot is factory set for 4 Volts (for
90 Volt DC output) and 8 Volts (for 180 Volt DC output). For higher compensating volt-
age, rotate the trimpot clockwise. For lower compensating voltage, rotate the trimpot
counterclockwise.
Note:
If the IR compensation is set too high, unstable (oscillatory) operation will result. If
the control is used with a tach-generator, the IR trimpot should be set fully counterclock-
wise.
IX. DIAGNOSTIC LEDs
The KBPW-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.
Note:
When removing power to the control, the POWER LED will remain illuminated for
a few seconds until the DC bus voltage discharges.
B. Stop (STOP) –
The STOP LED will illuminate yellow when the Start/Stop switch is set to
“STOP” position. When AC line is applied, this LED will also be illuminated until the
Start/Stop switch is set to “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 J2). This LED will remain illuminated if the control times out in TCL
13
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