
Control Loops CME 2 User Guide
124 Copley Controls
11.6: Position Loop Setup and Tuning
Initial position loop proportional gain (Pp), velocity feed forward (Vff), and acceleration
feed forward (Aff) values can be calculated with The Calculate Function (p. 54).
Enter Basic Position Loop Settings
Click P Loop to open the Position Loop Values screen:
Change/verify Position Loop Values as needed. Click Close when done.
Acceleration feed forward. Range: 0 to 32,767. See Trajectory Limits (p. 131).
Velocity feed forward. Range: 0 to 32,767. 100% Vff: 16,384.
See Trajectory Limits (p. 131).
Position loop proportional gain. Range: 0 to 32,767. See Trajectory Limits (p. 131).
Position loop output is multiplied by this value before going to the velocity loop. In dual
encoder systems, the multiplier’s initial value is calculated based on the ratio of motor
encoder turns to position encoder turns. See Feedback Parameters (p. 46).
The level (in encoder counts) at which the following error produces a fault, which stops
the servo loop. We recommend raising the fault level before tuning the loop.
See Following Error Fault Details (p. 91).
The level (in counts) at which the following error produces a warning (without stopping
the loop). See Following Error Fault Details (p. 91).
Stops following error from faulting. See Following Error Fault Details (p. 91).
Width of tracking window in counts. See Tracking Window Details (p. 92).
Position must remain in the tracking window for this amount of time to be considered
tracking. See Tracking Window Details (p. 92).
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