Danfoss VLT 6000 series Operating Instructions Manual page 125

417 Feedback function
(2 FEEDBACK, CALC.)
Value:
Minimum (MINIMUM)
Maximum (MAXIMUM)
Sum (SUM)
Difference (DIFFERENCE)
Average (AVERAGE)
2-zone minimum (2 ZONE MIN)
2-zone maximum (2 ZONE MAX)
Feedback 1 only (FEEDBACK 1 ONLY)
Feedback 2 only (FEEDBACK 2 ONLY)
Function:
This parameter allows a choice between
different calculation methods whenever two
feedback signals are used.
Description of choice:
If Minimum [0] is selected, the frequency converter will
compare feedback 1 with feedback 2 and regulate
on the basis of the lower feedback value.
Feedback 1 = Sum of parameter 535 Bus feedback 1
and the feedback signal value of terminal 53. Feedback
2 = Sum of parameter 536 Bus feedback 2 and the
feedback signal value of terminal 54.
If Maximum [1] is selected, the frequency converter
will compare feedback 1 withfeedback 2 and regulate
on the basis of the higher feedback value.
If Sum [2] is selected, the frequency converter will total
feedback 1 with feedback 2. Please note that the
remote reference will be added to Setpoint 1.
If Difference [3] is selected, the frequency converter
will subtract feedback 1 from feedback 2.
If Average [4] is selected, the frequency converter
will calculate the average of feedback 1 and
feedback 2. Please note that the remote reference
will be added to the Setpoint 1.
If 2-zone minimum [5] is selected, the frequency
converter will calculate the difference between Setpoint
1 and feedback 1 as well as Setpoint 2 and feedback 2.
After this calculation, the frequency converter will
use the larger difference. A positive difference,
i.e. a setpoint higher than the feedback, is always
larger than a negative difference.
If the difference between Setpoint 1 and feedback
1 is the larger of the two, parameter 418 Setpoint
1 will be added to the remote reference.
If the difference between Setpoint 2 and feedback 2
is the larger of the two, the remote reference will be
added to the parameter 419 Setpoint 2. If 2-zone
maximum [6] is selected, the frequency converter
= factory setting. () = display text [] = value for use in communication via serial communication port
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VLT 6000 HVAC Series
will calculate the difference between Setpoint 1 and
feedback 1 as well as Setpoint 2 and feedback 2.
After the calculation, the frequency converter will use
the smaller difference. A negative difference, i.e. one
[0]
where the setpoint is lower than the feedback, is
[1]
always smaller than a positive difference.
[2]
If the difference between Setpoint 1 and feedback 1
[3]
is the smaller of the two, the remote reference will
[4]
be added to the parameter 418 Setpoint 1.
[5]
If the difference between Setpoint 2 and feedback 2
[6]
is the smaller of the two, the remote reference will
[7]
be added to parameter 419 Setpoint 2.
[8]
If Feedback 1 only [7] is selected, terminal 53 is
read as the feedback signal and terminal 54 ignored.
Feedback 1 is compared to Setpoint 1 for drive control.
If Feedback 2 only [8] is selected, terminal 54 is read as
the feedback signal and terminal 53 ignored. Feedback
2 is compared to Setpoint 2 for drive control.
418 Setpoint 1
(SETPOINT 1)
Value:
Ref - Ref
MIN MAX
Function:
Setpoint 1 is used in closed loop as the reference to
compare the feedback values with. See description
of parameter 417 Feedback function. The setpoint
can be offset with digital, analog or bus references,
see Reference handling. Used in Closed loop
[1] parameter 100 Configuration.
Description of choice:
Set the required value. The process unit is selected
in parameter 415 Process units.
419 Setpoint 2
(SETPOINT 2)
Value:
Ref - Ref
MIN MAX
Function:
Setpoint 2 is used in closed loop as the reference to
compare the feedback values with. See description
of parameter 417 Feedbackfunction.
The setpoint can be offset with digital, analog or
bus signals, see reference handling.
0.000
0.000
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