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KB Electronics KBMM-225D User Manual

Page 27

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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

!

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