PROGRAMMING
SINUS K
MANUAL
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226
Fout/
nout
t
t
t
C
3
6
O
N
O
F
F
(
a
)
U
N
D
E
R
V
O
L
T
A
G
E
D
C
L
I
N
K
V
D
C
L
I
N
K
P
D
E
X
T
R
A
D
E
C
t
t
t
(
b
)
UNDERVOLTAGE
DC LINK
V
DC
LINK
U
N
D
E
R
V
O
L
T
A
G
E
D
C
L
I
N
K
Fout/
nout
ON
OFF
Mains
Mains
Figure 15: Output frequency/speed and DC bus voltage of the inverter (V
DC LINK
) in case of mains failure with a higher
(a) or shorter (b) duration than the motor stop time.
NOTE
(IFD SW only):
At power down, if the inverter stops due to Undervoltage alarm of the bus voltage
(because energy recovered for the inverter operation is not sufficient), speed searching
will occur only if this function is enabled (C55 set to [YES A]) and under the conditions
stated in section 3.4.