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VLT
®
6000 HVAC Series
Programming
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 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
with
feedback 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
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
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
.
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
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
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
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
.
✭
= factory setting. () = display text [] = value for use in communication via serial communication port
MG.61.A5.02 - VLT is a registered Danfoss trademark
125