Danfoss VLT HVAC Drive FC 102 Operating Instructions Manual page 96

How to Programme
20-06 Feedback 3 Source
Option:
[102] Bus feedback 3
[104] Sensorless Flow
[105] Sensorless Pressure
20-07 Feedback 3 Conversion
Option:
[0] Linear
*
[1] Square root
[2] Pressure to temperature
[3] Pressure to flow
6 6
[4] Velocity to flow
20-20 Feedback Function
Option:
[0] Sum
[1] Difference Sets up the PID controller to use the difference
[2] Average
94
Operating Instructions
Function:
Function:
See parameter 20-01 Feedback 1
Conversion for details.
Function:
This parameter determines how the 3 possible
feedbacks are used to control the output
frequency of the frequency converter.
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, or 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.
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.
Sets up the PID Controller to use the average of
feedback 1, feedback 2 and feedback 3 as the
feedback.
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20-20 Feedback Function
Option: Function:
NOTICE
Set any unused feedbacks to [0] No
Function in parameter 20-00 Feedback 1
Source, parameter 20-03 Feedback 2
Source, or 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.
[3] Minimum Sets up the PID controller to compare feedback
1, feedback 2 and feedback 3 and uses the
*
lowest value 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, or parameter 20-06 Feedback 3
Source. 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.
[4] Maximum Sets up the PID controller to compare feedback
1, feedback 2 and feedback 3 and use the
highest value 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, or parameter 20-06 Feedback 3
Source.
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.
[5] Multi Sets up the PID controller to calculate the
Setpoint difference between feedback 1 and setpoint 1,
Min feedback 2 and setpoint 2, and feedback 3 and
setpoint 3. It uses the feedback/setpoint pair in
which the feedback is the farthest below its
corresponding setpoint reference. If all feedback
signals are above their corresponding setpoints,
the PID controller uses the feedback/setpoint
pair with the least difference between the 2.
MG11F502