Danfoss VLT 6000 HVAC Series User Manual

417 Feedback function
(2 FEEDBACK, CALC.)
Value:
Minimum (MINIMUM) [0]
Maximum (MAXIMUM) [1]
Sum (SUM) [2]
Difference (DIFFERENCE) [3]
Average (AVERAGE) [4]
2-zone minimum (2 ZONE MIN) [5]
2-zone maximum (2 ZONE MAX) [6]
Feedback 1 only (FEEDBACK 1 ONLY) [7]
Feedback 2 only (FEEDBACK 2 ONLY) [8]
Function:
This parameter allows a choice between different cal-
culation 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. Feed-
back 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 re-
mote 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 con-
verter 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 set-
point 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 add-
ed to the parameter 419 Setpoint 2. If 2-zone maxi-
mum [6] is selected, the frequency converter will
calculate the difference between Setpoint 1 and feed-
back 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
where the setpoint is lower than the feedback, is al-
ways smaller than a positive difference.
If the difference between Setpoint 1 and feedback 1 is
the smaller of the two, the remote reference will be
added to the parameter 418 Setpoint 1.
If the difference between Setpoint 2 and feedback 2 is
the smaller of the two, the remote reference will be
added to parameter 419 Setpoint 2.
If Feedback 1 only [7] is selected, terminal 53 is read
as the feedback signal and terminal 54 ignored. Feed-
back 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. Feed-
back 2 is compared to Setpoint 2 for drive control.
418 Setpoint 1
(SETPOINT 1)
Value:
Ref
MIN
- Ref
MAX
0.000
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 Ref-
erence 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
MIN
- Ref
MAX
0.000
VLT
®
6000 HVAC Series
= factory setting, () = display text, [] = value for use in communication via serial communication port
150 MG.61.B5.02 - VLT
®
is a registered Danfoss trademark

Danfoss VLT 6000 HVAC Series Specifications

General

Brand	Danfoss
Model	VLT 6000 HVAC Series
Category	DC Drives
Language	English