Operation mode filling level 2, parameter
440 = 3
This operation mode can be used, for example, for contents level control.
The minimum value monitoring prevents an acceleration of the drive if the actual
value is missing.
If the actual value is missing (< 0.5%) the output frequency is guided to the Fixed
frequency
441. This is done using the set Deceleration (clockwise) 421.
If there is no control deviation (actual value =reference value) or if the control devia-
tion is negative (actual value>reference value), the output frequency is guided to
Minimum frequency 418. This is done using the set Controller settings. Additionally
Deceleration (clockwise) 421 limits the ramp. If Minimum frequency 418
the power stage is switched off in this case.
The drive accelerates as soon as an actual value is present again or the control de-
viation exceeds the positive
Hysteresis 443. The drive stops if Actual value ≥ Refer-
ence value, the control output reached 0 Hz and
Minimum frequency 418
M
in
i
mu
m
v
al
ue
>
0.
50
%
A
mpl
if
ic
at
io
n
444
P
D
if
fe
r
en
ti
a
l
Ti
m
e
6
18
I
In
t
eg
ra
l
T
i
me
4
4
5
+
+
-
M
ax.
P-
Comp
one
nt
Dif
fe
re
nc
e
1
0
Ma
x.
I
-Com
pon
ent
T
ec
h
no
lo
g
y
C
o
n
t
r
ol
l
e
r
Ac
t
.
P
er
ce
n
ta
ge
S
o
ur
c
e
4
7
8
Ref
. Pe
rce
nta
ge
Cha
nne
l
Re
f.
Pe
rc
en
ta
ge
S
ourc
e 4
76
P
.4
78
0
.5
0
%
<
F
ix
ed
F
re
qu
e
nc
y
Lim
ita
tion
222 Operating Instructions ACU 06/13
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