Danfoss VLT AutomationDrive FC 361 Series Design Manual page 66

Basic Operating Principles ...
Feedback conversion
In some applications, it is useful to convert the feedback signal. One example is using a pressure signal to provide flow
feedback. Since the square root of pressure is proportional to flow, the square root of the pressure signal yields a value
proportional to the flow, see Illustration 8.5.
Reference signal
8 8
Illustration 8.5 Feedback Conversion
8.2.4 Control Structure Overview
The control structure is a software process that controls the motor based on user-defined references (for example, RPM) and
whether feedback is used/not used (closed loop/open loop). The operator defines the control in parameter 1-00 Configu-
ration Mode.
The control structures are as follows:
Open-loop control structure
•
Speed (RPM).
•
Torque (Nm).
Closed-loop control structure
•
Speed (RPM).
•
Torque (Nm).
•
Process (user-defined units, for example, feet, lpm, psi, %, bar).
64
VLT® AutomationDrive FC 361
Reference
PID
Parameter 20-01
Parameter 20-04
Parameter 20-07
FB conversion
FB
Flow
FB signal
P
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P
Flow
P
MG06K102