Danfoss vlt FC 102 - Page 182

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.
•
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. The PID controller
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.
•
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.
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.
•
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
group3-1* References) are used as
the PID controller’s setpoint
reference.
[5] Multi Setpoint
Min
Sets up the PID controller to
calculate the dierence between
feedback 1 and setpoint 1,
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 dierence between the 2.
NOTICE
If only 2 feedback signals are
used, set the non-used feedback
to [0] No Function in
•
Parameter 20-00 Feedback
1 Source.
•
Parameter 20-03 Feedback
2 Source.
•
Parameter 20-06 Feedback
3 Source.
Note that each setpoint reference
is the sum of its respective
parameter value
(parameter 20-21 Setpoint 1,
parameter 20-22 Setpoint 2, and
parameter 20-23 Setpoint 3) and
any other references that are
enabled (see parameter group 3-1*
References).
Parameter Descriptions
VLT
®
HVAC Drive FC 102
180 Danfoss A/S © 10/2019 All rights reserved. M0010001
33