Danfoss VLT 5000 Series Instruction Manual page 107

ternal references as a percentage of the actual refer-
ence.
In addition, it is possible to use parameter 308 to select
whether the signals on terminals 54 and 60 are to be
added to the sum of the active references.
If External/preset [2] is selected, it is possible to shift
between external references or preset references via
terminal 16, 17, 29, 32 or 33 (parameter 300, 301, 305,
306 or 307). Preset references will be a percentage
value of the reference range.
External reference is the sum of the analog references,
pulses and bus references. See also drawings in sec-
tion Handling of multi-references .
Par. 204 Increase
Min. reference [Hz/V]
1) 0 5
2) 10 4
3) 20 3
4) 30 2
5) 40 1
215 Preset reference 1 (PRESET REF. 1)
216 Preset reference 2 (PRESET REF. 2)
217 Preset reference 3 (PRESET REF. 3)
218 Preset reference 4 (PRESET REF. 4)
Value:
-100.00 % - +100.00 %
= factory setting, () = display text, [] = value for use in communication via serial communication port
104
Frequency Par. 215
by 4.0 V Preset ref.
20 Hz 15 %
16 Hz 15 %
12 Hz 15 %
8 Hz 15 %
4 Hz 15 %
0.00%
of the reference range/ex-
ternal reference
®
VLT 5000 Series
NOTE
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).
The example shows how to calculate the output fre-
quency if using Preset references together with Sum
and Relative in parameter 214.
Parameter 205 Maximum reference has been set to 50
Hz.
Par. 214 Reference
type = Sum [0]
Output frequency
00+20+7.5 = 27.5 Hz
10+16+6.0 = 32.0 Hz
20+12+4.5 = 36.5 Hz
30+8+3.0 = 41.0 Hz
40+4+1.5 = 45.5 Hz
Function:
Four different preset references can be programmed
in parameters 215-218.
The preset reference is stated as a percentage of the
value Ref or as a percentage of the other external
MAX
references, depending on the choice made in param-
eter 214. If a Ref • 0 has been programmed, the
MIN
preset reference as a percentage will be calculated on
the basis of the difference between Ref
Ref , following which the value is added to Ref
MIN
Description of choice:
Set the fixed reference(s) that is/are to be the options.
To use the fixed references, it is necessary to have
selected Preset ref. enable on terminal 16, 17, 29, 32
or 33.
Choices between fixed references can be made by
activating terminal 16, 17, 29, 32 or 33 - see the table
below.
MG.51.C5.22 - VLT is a registered Danfoss trademark.
Par. 214 Reference
type = Relative [1]
Output frequency
00+20+3 = 23.0 Hz
10+16+2.4 = 28.4 Hz
20+12+1.8 = 33.8 Hz
30+8+1.2 = 39.2 Hz
40+4+0.6 = 44.6 Hz
and
MAX
.
MIN