GE AF-600 FP Design Manual page 31
Fan and pump drive
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Also See for AF-600 FP:
- Quick manual (260 pages) ,
- Operating instructions manual (176 pages) ,
- Design and installation manual (129 pages)
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NB!
While the default values for the drive's Closed Loop controller will often provide satisfactory performance, the control of the system can often be optimized by
adjusting some of the Closed Loop controller's parameters. It is also possible to autotune the PI constants.
The figure is a block diagram of the drive's Closed Loop controller. The details of the Reference Handling block and Feedback Handling block are described in their
respective sections below.
2.8.5 Feedback Handling
A block diagram of how the drive processes the feedback signal is shown below.
Feedback handling can be configured to work with applications requiring advanced control, such as multiple setpoints and multiple feedbacks. Three types of
control are common.
Single Zone, Single Setpoint
Single Zone Single Setpoint is a basic configuration. Setpoint 1 is added to any other reference (if any, see Reference Handling) and the feedback signal is selected
using par. CL-20 Feedback Function.
Multi Zone, Single Setpoint
Multi Zone Single Setpoint uses two or three feedback sensors but only one setpoint. The feedbacks can be added, subtracted (only feedback 1 and 2) or averaged.
In addition, the maximum or minimum value may be used. Setpoint 1 is used exclusively in this configuration.
If Multi Setpoint Min [13] is selected, the setpoint/feedback pair with the largest difference controls the speed of the drive. Multi Setpoint Maximum [14] attempts
to keep all zones at or below their respective setpoints, while Multi Setpoint Min [13] attempts to keep all zones at or above their respective setpoints.
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AF-600 FP Design Guide
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