20-13 Minimum Reference/Feedb.
Range:
Function:
0
ProcessCtrlUnit
*
[ -999999.999 -
par. 20-14
ProcessCtrlUnit]
Enter the desired minimum
value for the remote reference
when operating with
parameter 1-00 Configuration
Mode
set for
[3] Closed Loop
operation. Units are set in
20-12 Reference/Feedback Unit
.
Minimum feedback is -200%
of either the value set in
parameter 20-13 Minimum
Reference/Feedb.
or in
parameter 20-14 Maximum
Reference/Feedb.
, which ever
numeric value is the highest.
20-14 Maximum Reference/Feedb.
Range:
Function:
100
ProcessCtrlUnit
*
[ par. 20-13 -
999999.999
ProcessCtrlUnit]
NOTICE
If operating with
parameter 1-00 Configu-
ration Mode
set for
[0]
Open Loop
, use
3-03 Maximum Reference
.
NOTICE
The dynamics of the PID
controller depends on the
value set in this parameter.
See also
parameter 20-93 PID
Proportional Gain
Parameter 20-13 Minimum
Reference/Feedb.
and
parameter 20-14 Maximum
Reference/Feedb.
also
determine the feedback
range when using
feedback for display
readout with
parameter 1-00 Configu-
ration Mode
set for
[0]
Open Loop
. Same
condition as above.
Enter the maximum reference/
feedback for closed loop
operation. The setting
determines the highest value
obtainable by summing all
reference sources for closed
loop operation. The setting
determines 100% feedback in
open and closed loop (total
20-14 Maximum Reference/Feedb.
Range:
Function:
feedback range: -200% to
+200%).
3.18.2 20-2* Feedback & Setpoint
This parameter group is used to determine how the
frequency converter’s PID controller uses the 3 possible
feedback signals to control the output frequency of the
frequency converter. This group is also used to store the 3
internal setpoint references.
20-20 Feedback Function
Option:
Function:
This parameter determines how the 3 possible
feedbacks are used to control the output
frequency of the frequency converter.
[0] Sum
Sets up the PID controller to use the sum of
feedback 1, feedback 2 and feedback 3 as the
feedback.
NOTICE
Set any unused feedbacks to
[0] No
Function
in
•
Parameter 20-00 Feedback 1
Source
.
•
Parameter 20-03 Feedback 2
Source
.
•
Parameter 20-06 Feedback 3
Source
.
The sum of setpoint 1 and any other references
that are enabled (see parameter group
3-1*
References
) are used as the PID controller’s
setpoint reference.
[1] Difference Sets up the PID controller to use the difference
between feedback 1 and feedback 2 as the
feedback. Feedback 3 is not used with this
selection. Only setpoint 1 is used. The sum of
setpoint 1 and any other references that are
enabled (see parameter group
3-1* References
)
are used as the PID controller’s setpoint
reference.
[2] Average
Sets up the PID Controller to use the average of
feedback 1, feedback 2 and feedback 3 as the
feedback.
Parameter Descriptions
VLT
®
HVAC Drive FC 102
142
Danfoss A/S © 03/2015 All rights reserved.
MG11CE02
3
3
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