Technical information

20-14 Maximum Reference/Feedb.
Range: Function:
100.000
ProcessCtrlUnit*
[ par. 20-13 -
999999.999
ProcessCtrlUnit]
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
feedback range: -200% to
+200%).
NOTE
If operating with 1-00 Configuration Mode set for Open
Loop [0], 3-03 Maximum Reference must be used.
NOTE
The dynamics of the PID controller will depend on the
value set in this parameter. See also 20-93 PID Proportional
Gain.
20-13 Minimum Reference/Feedb. and20-14 Maximum
Reference/Feedb. also determine the feedback range when
using feedback for display readout with 1-00 Configuration
Mode set for Open Loop [0]. Same condition as above.
3.18.2 20-2* Feedback & Setpoint
This parameter group is used to determine how the
frequency converter’s PID Controller will use the three
possible feedback signals to control the output frequency
of the frequency converter. This group is also used to store
the three internal setpoint references.
20-20 Feedback Function
Option: Function:
This parameter determines how the three
possible feedbacks will be used to control the
output frequency of the frequency converter.
[0] Sum
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 No
Function in 20-00 Feedback 1 Source,
20-03 Feedback 2 Source, or 20-06 Feedback
3 Source.
The sum of Setpoint 1 and any other references
that are enabled (see parameter group 3-1*) will
be used as the PID Controller’s set-point
reference.
20-20 Feedback Function
Option: Function:
[1] Difference
Difference [1] sets up the PID controller to use
the difference between Feedback 1 and
Feedback 2 as the feedback. Feedback 3 will not
be used with this selection. Only Setpoint 1 will
be used. The sum of Setpoint 1 and any other
references that are enabled (see parameter
group 3-1*) will be used as the PID controller’s
set-point reference.
[2] Average
Average [2] sets up the PID Controller to use the
average of Feedback 1, Feedback 2 and
Feedback 3 as the feedback.
NOTE
Any unused feedbacks must be set to No
Function in 20-00 Feedback 1 Source,
20-03 Feedback 2 Source, or 20-06 Feedback
3 Source. The sum of Setpoint 1 and any
other references that are enabled (see
parameter group 3-1*) will be used as the
PID Controller’s set-point reference.
[3]
*
Minimum
Minimum [3] sets up the PID Controller to com
Feedback 1, Feedback 2 and Feedback 3 and
use the lowest value as the feedback.
NOTE
Any unused feedbacks must be set to No
Function in 20-00 Feedback 1 Source,
20-03 Feedback 2 Source, or 20-06 Feedback
3 Source. Only setpoint 1 will be used. The
sum of Setpoint 1 and any other
references that are enabled (see parameter
group 3-1*) will be used as the PID
Controller’s setpoint reference.
[4] Maximum
Maximum [4] sets up the PID Controller to com
Feedback 1, Feedback 2 and Feedback 3 and
use the highest value as the feedback.
NOTE
Any unused feedbacks must be set to No
Function in 20-00 Feedback 1 Source,
20-03 Feedback 2 Source, or 20-06 Feedback
3 Source.
Only Setpoint 1 will be used. The sum of
Setpoint 1 and any other references that are
enabled (see parameter group 3-1*) will be used
as the PID Controller’s setpoint reference.
[5] Multi
Setpoint
Min
Multi-setpoint minimum [5] sets up the PID
Controller to calculate the difference between
Feedback 1 and Setpoint 1, Feedback 2 and
Setpoint 2, and Feedback 3 and Setpoint 3. It
will use the feedback/setpoint pair in which the
feedback is the farthest below its corresponding
Parameter Description
VLT
®
HVAC Drive Programming Guide
132 MG11CD02 - VLT
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