VLT
®
6000 HVAC
92
★ = factory setting. ( ) = display text [ ] = value for use in communication via serial communication port
MG.60.B1.02 - VLT is a registered Danfoss trade mark
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 on page 89.
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 analogue
references, pulse references and any references from
serial communication.
NB!
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.
■■
■■
■ 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. A formula for calculating the resulting reference
is given on page 156.
See also the drawing on page 89.
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, analogue 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 analogue 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 analogue 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%.
(4 Seiten)
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