KB Electronics KBMM-225D - Manual (Page 27)

wired in series with the motor armature). If using an AC ammeter wired in the AC line input, the factory
Current Limit setting will read 0.75 times the full load rating of the motor.
Do not exceed 2 times motor current rating (maximum clockwise position).
Note: On cyclical loads, it may be normal for the CL LED to momentarily flash.
WARNING! Do not leave motor shaft locked for more than 2-3 seconds or motor damage
may result.
11.6 IR Compensation Trimpot (IR) – The IR Trimpot sets
the amount of compensating voltage required to keep
the motor speed constant under changing loads. If
the load does not vary substantially, the IR Trimpot
may be set to a minimum level (approximately 1/4 of
full clockwise rotation). The IR Trimpot is factory set
to provide 3 Volts of compensation for controls with
90 Volt DC output and 6 Volts of compensation for
controls with 180 Volt DC output. To increase the
amount of compensating voltage, rotate the IR Trimpot clockwise. To decrease the amount of compensating
voltage, rotate the IR Trimpot counterclockwise. See Figure 19.
Notes: 1. The correct value Plug-In Horsepower Resistor® must be installed for the IR Compensation to
operate properly. Calibration of the IR Trimpot is normally not required when the proper Plug-In Horsepower
Resistor® is installed. 2. Excessive IR Compensation will cause the motor to become unstable, which caus-
es cogging. 3. For tach-generator feedback applications, set the IR Trimpot fully counterclockwise. See
Section 6.9, on page 18.
To Recalibrate the IR Trimpot:
1 Set the IR Trimpot to approximately 25 % rotation.
27
(Factory set to 3 Volts DC for controls with 90 Volt DC Output)
0 24, 48
(Factory set to 6 Volts DC for controls with 180 Volt DC Output)
3, 6
FIGURE 19 – IR TRIMPOT RANGE
!