Danfoss VLT DriveMotor FCM 106 Design Manual page 17

Product Overview
Where X is the external reference, the preset reference or
the sum of these and Y is 3-14 Preset Relative Reference in
[%].
If Y, 3-14 Preset Relative Reference is set to 0%, the
reference is not affected by the scaling.
2.4.2 Feedback Handling
Feedback handling can be configured to work with
applications requiring control. Configure the feedback
source via parameter20-00 Feedback 1 source.
2.4.3 Feedback Conversion
In some applications it may be useful to convert the
feedback signal. One example of this 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 2.12.
Ref.
signal
Ref. +
P 20-01
-
Desired
FB conversion
ow
FB
signal
Illustration 2.12 Feedback Conversion
®
VLT DriveMotor FCP 106 and FCM 106 Design Guide
PI
FB
P
Flow
Flow
P
P
MG03M102 - 08/2015
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