Danfoss VLT 6000 HVAC Series User Manual

Reference type
The example shows how the resulting reference is cal-
culated 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 percent-
age of the reference range. If terminal 53 is energized
by an analog input voltage of 4 V, the resulting refer-
ence 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 refer-
ence 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 ref-
erence 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 ref-
erence 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 ref-
erences (parameters 211-214 Preset reference) is add-
ed 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 ex-
ternal 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 com-
munication.
NB!
If Sum or Relative is selected, one of the
preset references will always be active. If
the preset references are to be without in-
fluence, they should be set to 0% (as in
the factory setting) via the serial commu-
nication port.
VLT
®
6000 HVAC Series
= factory setting, () = display text, [] = value for use in communication via serial communication port
MG.61.B5.02 - VLT
®
is a registered Danfoss trademark 119
Programming

Danfoss VLT 6000 HVAC Series Specifications

General

Brand	Danfoss
Model	VLT 6000 HVAC Series
Category	DC Drives
Language	English