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Appendix
INTELLIGENT ACTUATOR
Servo Gain Adjustment
Since the servo has been adjusted at the factory in accordance with the standard specification of the
actuator, the servo gain need not be changed in normal conditions of use.
However, vibration or noise may occur depending on how the actuator is affixed, specific load condition,
and so on, and therefore the parameters relating to servo adjustment are disclosed to allow the customer
to take quick actions should adjustment become necessary.
Particularly with custom models (whose ball screw lead or stroke is longer than that of the standard
model), vibration/noise may occur due to external conditions.
In these cases, the parameters shown below must be changed. Contact IAI for details.
Position Gain
Axis-specific parameter
number
Unit Input range Default
(reference)
60 / sec 0 to 9999 30
This parameter determines the level of response with respect to a position control loop.
Increasing the setting improves compliance with the position command.
However, increasing the setting too much increases the tendency of the actuator to overshoot.
If the setting is low, compliance with the position command drops and the positioning time increases as a result.
Speed Loop Gain (Parameter List 1)
Driver card parameter
number
Unit Input range Default
(reference)
43 - 1 to 32767 500
This parameter determines the level of response with respect to a speed control loop.
Increasing the setting improves compliance with the speed command (i.e., servo rigidity increases).
The greater the load inertia, the higher the setting should be.
However, increasing the setting too much increases the tendency of the actuator to overshoot or oscillate,
resulting in increased mechanical vibration.
Speed
Setting is high (overshoot)
Setting is low
Time
Speed
Setting is high (overshoot)
Setting is low
Time
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