KB Electronics KBWM-240 User Manual

Page 11

A. Acceleration Start – The ACCEL is

factory set at approximately 2 seconds.
To readjust to different times, set the
knob to the desired position as shown
in Figure 6A.

B. Deceleration – The DECEL is factory

set to provide a ramp-down time of 2
seconds. To change the ramp-down
time, adjust the DECEL trimpot as indi-
cated in Figure 6B.

C. Minimum Speed Adjustment – If a

higher than zero minimum speed is
needed, readjust the minimum speed
by turning the speed control knob to
zero setting (full CCW position). Then
adjust the MIN speed trimpot to the
desired setting.

Note: The minimum speed adjustment
will affect the maximum speed setting.
Therefore, it is necessary to readjust
the maximum speed after the minimum
speed.

D. Maximum Speed Adjustment – Turn

Speed Control Knob to full speed (full
CW position). Adjust MAX speed trim-
pot to new desired setting.

Note: Do not attempt to adjust the max-
imum speed above the rated motor RPM
since unstable motor operation may
occur. For moderate changes in the
maximum speed, there will only be a
slight effect on the minimum speed setting.

E. Current Limit (CL/Torque Adjustment) – CL circuitry is provided to protect the motor

and control against overloads. The CL also limits the inrush current to a safe level during
startup. The CL is factory set to approximately 1.5 times the full load rating of the motor.
(CL trimpot is nominally set to approximately 65% of full CW rotation.) Note: Proper size
Plug-in Horsepower Resistor® must be installed.

To set the CL to factory specifications adjust as follows:

1. Set speed control knob at approximately 30 - 50% CW rotation. Set CL trimpot to full

CCW position.

2. Connect a DC ammeter in series with the armature lead.

3. Lock shaft of motor (be sure CL pot is in full CCW position). Apply power and rotate CL

pot CW until DC ammeter reads 1.5 times motor rating. (Do not exceed 2 times motor
rating.) Do not leave motor in locked rotor position for more than a few seconds or dam-
age may occur. Note: The CL LED will illuminate when the control is in current limit.

10 SEC.

SLOW

0.2 SEC.

RAPID

FACTORY SETTING 2 SEC.

5 SEC.

8 SEC.

ACCEL

FIGURE 6A – ACCEL TRIMPOT ADJUSTMENT