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
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 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
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