Technical information

20-20 Feedback Function
Option: Function:
setpoint reference. If all feedback signals are
above their corresponding setpoints, the PID
Controller will use the feedback/setpoint pair in
which the difference between the feedback and
setpoint is the least.
NOTE
If only two feedback signals are used, the
feedback that is not to be used must be
set to No Function in 20-00 Feedback 1
Source, 20-03 Feedback 2 Source or
20-06 Feedback 3 Source. Note that each
setpoint reference will be the sum of its
respective parameter value (20-21 Setpoint
1, 20-22 Setpoint 2 and 20-23 Setpoint 3)
and any other references that are enabled
(see parameter group 3-1*).
[6] Multi
Setpoint
Max
Multi-setpoint maximum [6] 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 farthest above its corresponding
setpoint reference. If all feedback signals are
below their corresponding setpoints, the PID
Controller will use the feedback/setpoint pair in
which the difference between the feedback and
the setpoint reference is the least.
NOTE
If only two feedback signals are used, the
feedback that is not to be used must be
set to No Function in 20-00 Feedback 1
Source, 20-03 Feedback 2 Source or
20-06 Feedback 3 Source. Note that each
setpoint reference will be the sum of its
respective parameter value (20-21 Setpoint
1, 20-22 Setpoint 2 and 20-23 Setpoint 3)
and any other references that are enabled
(see parameter group 3-1*).
NOTE
Any unused feedback must be set to “No function” in its
Feedback Source parameter: 20-00 Feedback 1 Source,
20-03 Feedback 2 Source or 20-06 Feedback 3 Source.
The feedback resulting from the function selected in
20-20 Feedback Function will be used by the PID Controller
to control the output frequency of the frequency
converter. This feedback can also be shown on the
frequency converter’s display, be used to control a
frequency converter's analog output, and be transmitted
over various serial communication protocols.
The frequency converter can be configured to handle multi
zone applications. Two different multi zone applications
are supported:
•
Multi zone, single setpoint
•
Multi zone, multi setpoint
Parameter Description
VLT
®
HVAC Drive Programming Guide
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®
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