Danfoss VLT HVAC Drive FC 102, Instruction Manual

Page: 104 / 140

20-20 Feedback Function
Option: Function:
[5] Multi
Setpoint
Min
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 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 two.
NOTICE!
If only two 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 , or
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 ).
[6] Multi
Setpoint
Max
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 uses the feedback/setpoint pair in
which the feedback is farthest above its
corresponding setpoint reference. If all feedback
signals are below their corresponding setpoints,
the PID controller uses the feedback/setpoint
pair with the least difference between the two.
NOTICE!
If only two 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 , or
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 ).
NOTICE!
Set any unused feedback 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 PID controller uses the feedback resulting from the
function selected in
parameter 20-20 Feedback Function to
control the output frequency of the adjustable frequency
drive. This feedback can also:
•
Be shown on the adjustable frequency drive’s
display.
•
Be used to control an adjustable frequency drive's
analog output.
•
Be transmitted over various serial communication
protocols.
The adjustable frequency drive can be configured to
handle multi-zone applications. Two different multi-zone
applications are supported:
•
Multi-zone, single setpoint
•
Multi-zone, multi-setpoint
How to Program
VLT
®
HVAC Drive FC 102
102 Danfoss A/S © 08/2014 All rights reserved. MG11F522
6 6