3.1.4 Reference Handling
Details for Open Loop and Closed Loop operation.
Speed open
loop
Configuration
mode
Input command:
freeze reference
Process
control
Scale to
Hz
Scale to
process
unit
Remote
reference/
setpoint
±200%
Feedback
handling
Remote
reference in %
maxRefPCT
minRefPct
min-max ref
Freeze
reference &
increase/
decrease
reference
±100%
Input commands:
Speed up/speed down
±200%
Relative
reference
=
X+X*Y/100
±200%
External reference in %
±200%
Parameter choise:
Reference resource 1,2,3
±100%
Preset reference
Input command:
preset ref bit0, bit1, bit2
+
+
Relative scalling reference
Intern resource
Preset relative reference
±100%
Preset reference 0 ±100%
Preset reference 1 ±100%
Preset reference 2 ±100%
Preset reference 3 ±100%
Preset reference 4 ±100%
Preset reference 5 ±100%
Preset reference 6 ±100%
Preset reference 7 ±100%
Extern resource 1
No function
Analog reference
±200 %
Local bus reference
±200 %
LCP potmeter 0~100 %
Extern resource 2
No function
Analog reference
±200 %
Local bus reference
±200 %
LCP potmeter 0~100 %
Extern resource 3
No function
Analog reference
±200 %
Local bus reference
±200 %
LCP potmeter 0~100 %
Y
X
130BB900.13
Illustration 3.4 Block Diagram Showing Remote Reference
The remote reference is comprised of
•
Preset
references
•
External references (analog inputs and serial
communication bus references)
•
The preset relative reference
•
Feedback controlled setpoint
Up to 8 preset references can be programmed in the
frequency converter. The active preset reference can be
selected using digital inputs or the serial communications
bus. The reference can also be supplied externally, most
commonly from an analog input. This external source is
selected by one of the 3 Reference Source parameters
(3-15 Reference 1 Source
, 3-16 Reference 2 Source and
3-17 Reference 3 Source). All reference resources and the
bus reference are added to produce the total external
reference. The external reference, the preset reference or
the sum of the two can be selected to be the active
reference. Finally, this reference can by be scaled using
3-14
Preset Relative Reference.
The scaled reference is calculated as follows:
Reference
=
X
+
X
×
(
Y
100
)
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 will not be affected by the scaling.
Introduction to VLT® Micro ...
VLT
®
Micro Drive FC 51 Design Guide
20 MG02K202 - VLT
®
is a registered Danfoss trademark
33
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