VLT
®
4000 VT
214) will be added to the external references as a
percentage of the reference range. If terminal 53
is energized by an analog input voltage of 4 V, the
resulting reference will be as follows:
Par. 210
Reference type
= Sum [0]
Par. 204
Minimum reference
= 10.0 Hz
Reference contribution at 4 V
= 16.0 Hz
Par. 211
Preset reference
= 6.0 Hz
Resulting reference
= 32.0 Hz
If parameter 210
Reference type
is set to
Relative
[1], one of the adjusted
Preset references
(par.
211-214) will be totaled as a percentage of the sum
of the present external references. If terminal 53
is energized by an analog input voltage of 4 V, the
resulting reference will be as follows:
Par. 210
Reference type = Relative
[1]
Par. 204
Minimum reference
= 10.0 Hz
Reference contribution at 4 V
= 16.0 Hz
Par. 211
Preset reference
= 2.4 Hz
Resulting reference
= 28.4 Hz
The graph in the next column shows the
resulting reference in relation to the external
reference varied from 0-10 V.
Parameter 210
Reference type
has been programmed
for
Sum
[0] and
Relative
[1], respectively. In addition,
a graph is shown in which parameter 211
Preset
reference
1 is programmed for 0%.
210 Reference type
(REF. FUNCTION)
Value:
✭
Sum (SUM)
[0]
Relative (RELATIVE)
[1]
External/preset (EXTERNAL/PRESET)
[2]
Function:
It is possible to define how the preset references
are to be added to the other references. For
this purpose,
Sum
or
Relative
is used. It is also
possible - by using the
External/preset
function - to
select whether a shift between external references
and preset references is wanted.
See
Reference handling
.
Description of choice:
If
Sum
[0] is selected, one of the adjusted preset
references (parameters 211-214
Preset reference
) is
added to the other external references as a percentage
of the reference range (Ref
MIN
-Ref
MAX
).
If
Relative
[1] is selected, one of the adjusted
preset references (parameters 211-214
Preset
reference
) is totaled as a percentage of the sum
of the present external references.
If
External/preset
[2] is selected, it is possible to shift
between external references and preset references via
terminal 16, 17, 29, 32 or 33 (parameter 300, 301,
305, 306 or 307
Digital inputs
). Preset references will
be a percentage value of the reference range.
External reference is the sum of the analog
references, pulse references and any references
from serial communication.
NOTE
If
Sum
or
Relative
is selected, one of the
preset references will always be active. If the
preset references are to be without influence,
they should be set to 0% (as in the factory setting)
via the serial communication port.
211 Preset reference 1
(PRESET REF. 1)
212 Preset reference 2
(PRESET REF. 2)
213 Preset reference 3
(PRESET REF. 3)
214 Preset reference 4
(PRESET REF. 4)
Value:
-100.00 % - +100.00 %
✭
0.00%
of the reference range/external reference
Function:
Four different preset references can be programmed
in parameters 211-214
Preset reference
. The
MG.40.A7.22 - VLT is a registered Danfoss trademark
78