19
Calibration
IR COMPENSATION (IR COMP)
The IR COMP trimpot setting determines the degree to which
motor speed is held constant as the motor load changes. It is
factory set for optimum motor regulation.
To calibrate IR COMP refer to the recommended IR COMP settings
in Figure 11, page 22, or use the following procedure:
1. Set the IR COMP trimpot to minimum (full CCW).
2. Rotate the speed adjust potentiometer until the motor runs at
midspeed without load (for example, 900 RPM for an 1800 RPM
motor). A hand held tachmoter may be used to measure motor
speed.
3. Load the motor armature to its full armature current rating. The
motor should slow down.
4. While keeping the load on the motor, rotate the IR COMP
trimpot until the motor runs at the speed measured in step 2. If
the motor oscillates (overcompensation), the IR COMP trimpot
may be set too high (CW). Turn the IR COMP trimpot CCW to
stabilize the motor.
5. Unload the motor.
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