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Manual 26659
ProAct P-Series FL Position Controller
Woodward
65
Figure 6-3. Auto Cal Inertia & Friction Screen
Adjusting the Inertia Setting
The inertia setting calibrates the position controller to the load inertia. A setting of
zero represents the actuator shaft with no load attached. The higher the load
inertia, the higher the required inertia setting.
The position calibration wizard provides an opportunity to test the settings. When
the Test button is pressed, the actuator will go to the 30 % position, pause, go to
the 60 % position, pause, return to the 30 % position, pause, and go to the 0 %
position. The actuator response to these steps helps determine the correct inertia
setting.
If the inertia setting is too low, there may be a slow oscillation when the actuator
should be steady, or the step response may show excessive overshoot and
ringing. If the inertia setting is too high, a high frequency oscillation or limit cycle
may be seen. If a range of values is seen to provide adequate response, the
lowest value that does not produce overshoot should be chosen.
Adjusting the Friction Setting
The friction setting represents the actuator current required to overcome static
load friction.
Where no spring return is present, the Input Current value should be increased
until the actuator just begins to move. That value of Input Current should then be
entered as the Friction Setting. Ideally, this should be done in the middle of the
travel range, and not at either end.
Where a return spring is present, the input current should be gradually increased
until the actuator begins to move against the spring, then gradually decreased
until it moves in the opposite direction. The Friction Setting should be one-half of
the difference between these two values. For example, if it takes 0.7 A to begin
moving against the spring, and at 0.5 A the actuator moves with the spring in the
opposite direction, set the Friction Setting at (0.7 – 0.5) / 2 = 0.1 A.
Содержание ProAct P Series FL
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