VLT
®
6000 HVAC
117MG.60.B1.02 - VLT is a registered Danfoss trade mark
★ = factory setting. ( ) = display text [ ] = value for use in communication via serial communication port
Programming
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 VLT frequency
converter will calculate the difference between
Setpoint 1 and feedback 1 as well as Setpoint 2 and
feedback 2.
After the calculation, the VLT frequency converter will
use the smaller difference. A negative difference, i.e.
one where the setpoint is lower than the feedback, is
always 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.
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 Reference handling.
Used in Closed loop [1] parameter 100 Configura-
tion.
Description of choice:
Set the required value. The process unit is selected in
parameter 415 Process units.
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]
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 VLT 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 VLT frequency
converter will compare feedback 1 with feedback 2
and regulate on the basis of the higher feedback
value.
If Sum [2] is selected, the VLT 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 VLT frequency
converter will subtract feedback 1 from feedback 2.
If Average [4] is selected, the VLT 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 VLT frequency
converter will calculate the difference between
Setpoint 1 and feedback 1 as well as Setpoint 2 and
feedback 2.
After this calculation, the VLT 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.
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