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VLT
®
HVAC Drive Programming Guide
20-13 Minimum Reference/Feedb.
Range:
0.000 Proc-
[-999999.999 - par. 20-14 Proc-
essCtrlU-
essCtrlUnit]
nit*
20-14 Maximum Reference/Feedb.
Range:
100.000
[par. 20-13 - 999999.999 Proc-
ProcessCtr-
essCtrlUnit]
lUnit*
NOTE!
Configuration Mode
If operating with par.1-00
NOTE!
The dynamics of the PID controller will depend on the value set in this parameter. Please also see par.20-93
Par. 20-13 and par. 20-14 also determine the feedback range when using feedback for display readout with par.1-00
Mode
set for Open-loop [0]. Same condition as above.
3.18.3 20-2* Feedback & Setpoint
This parameter group is used to determine how the adjustable frequency drive's PID controller will use the three possible feedback signals to control the
output frequency of the adjustable frequency drive. This group is also used to store the three internal setpoint references.
20-20 Feedback Function
Option:
[0]
Sum
Function:
Enter the desired minimum value for the remote reference when operating with par. 1-00, Config-
uration Mode set for Closed-loop [3] operation. Units are set in par. 20-12, Reference/Feedback
Unit.
Minimum feedback will be -200% of either the value set in par. 20-13 or in par. 20-14, which ever
numeric value is the highest.
NOTE!
If operating with par.1-00, Configuration Mode set for Open-loop [0], par. 3-02,
Minimum Reference must be used.
Function:
Enter the maximum reference/feedback for closed-loop operation. The setting determines the high-
est value obtainable by summing all reference sources for closed-loop operation. The setting
determines 100% feedback in open-loop and closed-loop (total feedback range: -200% to +200%).
Maximum Reference
set for Open-loop [0], par.3-03
Function:
This parameter determines how the three possible feedbacks will be used to control the output
frequency of the adjustable frequency drive.
Sum
[0] sets up the PID controller to use the sum of Feedback 1, Feedback 2 and Feedback 3 as
the feedback.
NOTE!
Any unused feedbacks must be set to
Source
, par.20-03
The sum of Setpoint 1 and any other references that are enabled (see par. group 3-1*) will be used
as the PID controller's setpoint reference.
MG.11.C6.22 - VLT
®
is a registered Danfoss trademark
3 Parameter Description
must be used.
No Function
in par.20-00
Feedback 2 Source
Feedback 3 Source
, or par.20-06
3
PID Proportional Gain
.
Configuration
Feedback 1
.
3-173
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