VLT
®
6000 HVAC
117
MG.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.