KB Electronics KBMA-24DF - Manual (Page 23)

The CL Trimpot is factory set to 160% of the drive rated current. To
increase the current limit, rotate the CL Trimpot clockwise. To decrease
the current limit, rotate the CL Trimpot counterclockwise. See Figure 22.
Figure 23 shows the I 2 t Trip Time vs. Motor Overload. Also see Section
4.2, on page 13.
*UL approved as an electronic overload protector for motors.
CAUTION! Adjusting the current limit above 160% of the motor
nameplate rating can cause overheating of the motor. Consult the motor
manufacturer. Do not leave the motor in a locked rotor condition for more than a few seconds since
damage may occur.
In order to ensure that the motor is properly protected with the I 2 t feature, it is required that the
CL Trimpot be set for 160% of the motor nameplate rated current, as described on page 16.
Note: This adjustment must be made within 6 seconds or an I 2 t Trip will occur.
The current limit may be adjusted as follows:
1. Connect an AC RMS ammeter in series with one motor phase.
2. Set the CL Trimpot fully counterclockwise.
3. Adjust the speed setting to 30%.
4. Lock the motor shaft and adjust the CL Trimpot to 160% of the motor nameplate rated current.
23
CL 120
80 40
160 200
FIGURE 22 – CURRENT LIMIT
TRIMPOT RANGE
(Shown Factory Set to 160% Full Load)
Tr
ip
Time (Minutes)
CL (Factory Setting)
140 110 120 130
0.1
Motor Current (%)
1
160 150
10
100
1000
FIGURE 23 – I 2 t TRIP TIME VS . MOTOR CURRENT