200
Operating Instructions ACU
09/08
Operation mode indirect volume flow control,
parameter
Operation mode
440 = 5
This operation mode is suitable for volume flow control based on pressure measure-
ment.
The square rooted actual value enables, for example, direct measurement of the
active pressure in the system via the intake nozzle of the fan. The active pressure
has a square proportion to the volume flow and thus forms the control figure for the
volume flow control. The calculation corresponds to the "Law of Proportionality"
which is generally valid for centrifugal machines.
Adaptation to the application in question and measurement are done via the
Ind. vol-
ume flow control factor
446
. The actual values are calculated from the system data
to be parameterized, reference pressure and volume flow, according to the bad point
method, as described in chapter "Volume Flow and Pressure".
The output frequency is limited by the
Minimum frequency
418
and
Maximum fre-
quency
419
.
T
ech
no
lo
g
y
Co
ntrol
ler
Ac
t.
P
er
ce
nt
ag
e
So
urce
4
7
8
Re
f.
P
er
cen
ta
g
e
Channe
l
Ref
. P
er
ce
nt
ag
e
So
ur
ce
4
7
6
Amp
lif
ic
ati
on
4
4
4
P
D
iffe
re
nt
ia
l Ti
m
e
61
8
I
Int
eg
ra
l T
im
e
4
4
5
+
+
-
Max. P-Co
mponent
Li
m
ita
ti
o
n
Ma
x.
I-
C
o
m
p
o
n
ent
Volume flo
w
Operating Instructions ACU
09/08
200
Summary of Contents for Bonfiglioli Vectron ACTIVE CUBE ACU 201 Series
Page 1: ...ACTIVE CUBE Operating Instructions Frequency Inverter 230V 400V 0 25 kW 132 kW ...
Page 2: ......
Page 259: ......
