KB Electronics KBIC-240DS - Manual (Page 18)

18
FIGURE 7. CL TRIMPOT RANGE
0
150 %
300 %
(Factory Set to 150% of Full Load)
7.4 Current Limit Trimpot (CL)
The CL Trimpot sets the current limit (overload), which
limits the maximum current (torque) to the motor. The
CL also limits the AC line inrush current to a safe level
during startup. The CL Trimpot is factory set to 1.5
times the full load rating of the motor. To increase the
current limit, rotate the CL Trimpot clockwise (do not
exceed 2 times (200%) motor current rating (maximum
clockwise position)). To decrease the current limit,
rotate the CL Trimpot counterclockwise. See Figure 7.
Note: The correct value Plug-In Horsepower Resistor® must
be installed for the CL to operate properly. Calibration
of the CL Trimpot is normally not required when the
proper Plug-In Horsepower Resistor
® is installed.
To Recalibrate the CL Trimpot:
1. Disconnect the AC power and wire a DC ammeter in series with either motor armature lead.
Note: If only an AC ammeter is available, wire it in series with either AC line input lead.
2. Re-Apply power.
3. Set the Main Speed Potentiometer to approximately 30 - 50 % clockwise position.
`
4. Set the CL Trimpot fully counterclockwise.
5. Lock the motor shaft. The CL LED will illuminate red.
WARNING - DO NOT LEAVE MOTOR SHAFT LOCKED FOR MORE THAN 2-3 SECONDS OR
MOTOR DAMAGE MAY RESULT.
6. Rotate the CL Trimpot clockwise until the desired current reading is observed on the DC
ammeter. Factory Current Limit setting is 1.5 times the full load rating of the motor (with a DC
ammeter wired in series with the motor armature). If using an AC ammeter wired in the AC line
input, set the CL 0.75 times the full load rating of the motor. Do not exceed 2 times motor current
rating. Refer to Figure 7.
Note: On cyclical loads, it may be normal for the CL LED to momentarily flash.