Danfoss VLT AQUA FC 202 - Sine-Wave Filter Fixed Mode

CTRL/
Modulation
Limit
f
SW
Setting
from LCP
f
SW, ref
f
SW
(load)
f
SW
(U
DC
)
f
SW
( f
m
)
f
SW
(T)
Ramp
PWM
PWM (T)
PWM (f)
Protection
flag
f
SW, ref
f
SW, ref
e30bd550.10
Illustration 24: Automatic Derating Function Block
7 0
%
f
s
w
1
6
0 %
I
m
1
6
k
H
z
@ 6
0
P
W
M
1
0
k
H z
@
S
F
A
V M
1
0
k
H
z
@
6
0 P
W
M
7
k
H
z
@ S
F
A
V M
C
T
R
L /
m
o
d
u
l
a
t
i
o
n
l
i
m
i
t
f
s
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s
e t
t
i
n
g
f
r
o
m
L
C
P
f
s
w
, r
e
f
f
s
w
,
I
f
s w
,
U
D
C
f
m
o
t
o
r
[
H
z
]
f
s
w
[
k
H
z
]
1
0
S F
A
V
M
o
n
l
y
1
5
3
. 9
4
9
. 9
f
s
w
,
f
m
2
,
f
s
w
,
f
m
3
f
s
w
,
f
m
4
f
s
w
,
f
m
1
f
s
w
U
D
C
,
T
R
I
P
U
D
C
R
e
q
u
e
s
t
e
d
f
s
w
U
D
C
,
S
T
A
R
T
D
E
R
A
T
I
N
G
P
W
M
f
m
o
t
o
r
[
H
z
]
S
F A
V
M
6
0
P
W
M
o
p
t
i
o
n
a
l
8
0
%
-
8
6
%
o
f
f
m
o
t
o
r
,
n
o
m
1 0
H
z
-
1
5
H
z
T
A
M
B
T
P
W
M
S
W
I
T
C
H
6
0
P
W
M
S
F
A
V
M
t
2
t
1
T
A
M
B
H
i
g
h
w
a
r
n
i
n
g
L
o
w
w
a
r
n
i
n
g
f
s
w
f
s
w
,
f
s
f
s
w
,
TAS
f
s
R
a
m
p
f
s
w
,
D
S
P
f
s
w
(
I
l
o a
d
)
f
s
w
(
U
D
C
)
f
s w
(
f
m
)
f
s
w
(
T
)
P
W
M
(
T
)
P
W
M
(
f
s
)
P
W
M
e30bb971.10
Protection flag
(drop to f
s
w,min
immediately)
Illustration 25: Interrelationship Between the Automatic Derating Contributions
The switching frequency is rst derated due to motor current, followed by DC-link voltage, motor frequency, and then temperature.
If multiple deratings occur on the same iteration, the resulting switching frequency would be the same as though only the most
signicant derating occurred by itself (the deratings are not cumulative). Each of these functions is presented in the following sec-
tions.
6.1.9.2 Sine-wave Filter Fixed Mode
When using sine-wave lters, it is important to operate the lters within a safe range of switching frequencies. If the switching fre-
quency is too low, the current through the lter rises, increasing the temperature with risk of damage to the lter.
During programming of the drive, it is possible to select an option for setting a minimum limit for the switching frequency. This
xed-mode function prevents the swithcing frequencies from being too low.
AJ300847815559en-000101 / 130R033740 | Danfoss A/S © 2020.09
Product Features
VLT® AQUA Drive FC 202
Design Guide