VLT
®
8000 AQUA
■
Reference type
The example shows how the resulting reference is
calculated when Preset references are used together
with Sum and Relative in parameter 210 Reference
type. See
Calculation of resulting reference
. See
also the drawing in
Reference handling
.
The following parameters have been set:
Par. 204
Minimum reference:
10 Hz
Par. 205
Maximum reference:
50 Hz
Par. 211
Preset reference:
15%
Par. 308
Terminal 53, analog input:
Reference [1]
Par. 309
Terminal 53, min. scaling:
0 V
Par. 310
Terminal 53, max. scaling:
10 V
When parameter 210
Reference type
is set to Sum
[0], one of the adjusted
Preset references
(par. 211-
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.
✭
= factory setting. () = display text [] = value for use in communication via serial communication port
MG.80.A7.22 - VLT is a registered Danfoss trademark
106
Rosewood STP ST42 General (Operation and Maintenance Manual - Part 4:
Section 6.3 Manufacturers Manuals 6.3.33 Danfoss VLT Aquadrive 8000) Vendor Manual
QP Id: VM207
Active: 03/09/2013
Page 112 of 208