Main Menu - Fc Closed Loop - Group - Danfoss VLT HVAC Basic Drive FC 101 Programming Manual

Parameters

3.14 Main Menu - FC Closed Loop - Group

20
This parameter group is used for configuring the closed-
loop PI controller that controls the output frequency of the
frequency converter.
3.14.1 20-0* Feedback
This parameter group is used to configure the feedback
signal for the closed-loop PI control of the frequency
converter.
20-00 Feedback 1 Source
Option: Function:
This parameter defines which input is
used as the source of the feedback
signal.
[0] No function
*
[1] Analog Input 53
[2] Analog Input 54
[3] Pulse input 29
[100] Bus Feedback 1
[101] Bus Feedback 2
[104] Sensorless Flow
[105] Sensorless Pressure
20-01 Feedback 1 Conversion
Option: Function:
This parameter allows a conversion function to
be applied to feedback 1.
[0] Linear [0] Linear has no effect on the feedback.
*
[1] Square [1] Square root is commonly used when a
root pressure sensor is used to provide flow
feedback.
(
( flow ∝ pressure)
20-03 Feedback 2 Source
Option:
[0] No function
*
[1] Analog Input 53
[2] Analog Input 54
[3] Pulse input 29
[100] Bus Feedback 1
[101] Bus Feedback 2
20-04 Feedback 2 Conversion
Option:
[0] Linear
*
[1] Square root
MG18B502
Programming Guide
).
Function:
Function:
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20-12 Reference/Feedback Unit
Option: Function:
Select the unit to be used with
references and feedbacks for closed
loop.
[0] None Expressionlimit
*
[20] l/s
[23] m3/s
[24] m3/min
[25] m3/h
[71] bar
[73] kPa
[74] m Wg
[75] mm Hg
[120] GPM
[121] gal/s
[122] gal/min
[123] gal/h
[124] CFM
[125] ft
3
/s
[126] ft
3 /min
[170] psi
[171] lb/in2
[172] in WG
[173] ft WG
[174] in Hg
3.14.2 20-2* Feedback/Setpoint
Parameter group for feedback function and setpoints.
Select which setpoint and feedback to use. The setpoint
and feedback can be a fixed pair or selected separately
based on logic comparisons.
20-20 Feedback Function
Select how the feedback should be calculated. The feedback can
be either a single feedback source or a combination of several
feedbacks.
Option:
[0] Sum
[1] Difference
[2] Average
[3] Minimum
*
[4] Maximum
3
Function:
85
3