37
Calibration
IR COMPENSATION (IR COMP)
The IR COMP setting determines the degree to which motor speed is held constant
as the motor load changes. It is factory set at optimum motor regulation for the high-
est motor horsepower.
To calibrate IR COMP, refer to Figure 13 (page 33), or use the following procedure:
1. Turn the IR COMP trimpot full CCW.
2. Set the speed adjust potentiometer or input signal until the motor runs at midspeed
without load (for example, 900 RPM for an 1800 RPM motor). A hand held
tachometer may be used to measure motor speed.
3. Load the motor armature to its full load 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.
Approximate calibration:
If the motor does not maintain set speed as the load changes,
gradually rotate the IR COMP trimpot CW. 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 speed.
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