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NB!
Any unused feedbacks must be set to
No Function
in par. 20-00, par. 20-03, or par. 20-06.
The sum of Setpoint 1 and any other references that are enabled (see par. group 3-1*) will
be used as the PID Controller’s setpoint reference.
[3]
*
Minimum
Minimum
[3] sets up the PID Controller to compare Feedback 1, Feedback 2 and Feedback 3 and use the lowest
value as the feedback.
NB!
Any unused feedbacks must be set to
No Function
in par. 20-00, 20-03, or 20-06. Only setpoint
1 will be used. The sum of Setpoint 1 and any other references that are enabled (see par.
group 3-1*) will be used as the PID Controller’s setpoint reference.
[4]
Maximum
Maximum
[4] sets up the PID Controller to compare Feedback 1, Feedback 2 and Feedback 3 and use the highest
value as the feedback.
NB!
Any unused feedbacks must be set to
No Function
in par. 20-00, par. 20-03, or par. 20-06.
Only Setpoint 1 will be used. The sum of Setpoint 1 and any other references that are enabled (see par. 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 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.
NB!
If only two feedback signals are used, the feedback that is not to be used must be set to
No
Function
in par. 20-00, par. 20-03 or par. 20-06. Note that each setpoint reference will be the
sum of its respective parameter value (par. 20-11, par. 20-12 and par. 20-13) and any other
references that are enabled (see par. 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.
NB!
If only two feedback signals are used, the feedback that is not to be used must be set to
No
Function
in par. 20-00, par. 20-03 or par. 20-06. Note that each setpoint reference will be the
sum of its respective parameter value (par. 20-21, par. 20-22 and par. 20-23) and any other
references that are enabled (see par. group 3-1*).
NB!
Any unused feedback must be set to “No function” in its Feedback Source parameter: 20-00, 20-03 or 20-06.
The feedback resulting from the function selected in par. 20-20 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
The difference between the two is illustrated by the following examples:
3. Parameter Description
VLT
®
HVAC Drive Programming Guide
158
MG.11.C5.02 - VLT
®
is a registered Danfoss trademark
3