01/02 AWB8230-1415GB
Controlled deceleration
161
If the mains power fails during controlled deceleration
(PNU b050 = 01), deceleration starts as soon as the internal DC
link voltage V
DC
falls below the threshold set under PNU b051.
To ensure that the control electronics are supplied with power, the
current output frequency f
O
is reduced by the frequency jump set
under PNU b054. The motor then runs in regenerative mode and
feeds the internal DC link voltage V
DC
. Deceleration now takes
place after the set deceleration ramp (PNU b053). If, due to a high
mass inertia, the internal DC link voltage V
DC
becomes excessi-
vely high, the deceleration ramp is interrupted until the voltage
falls below the threshold defined under PNU b052.
Figure 166: Function chart for controlled deceleration
V
DC
:Internal DC link voltage
V
UV
:Voltage threshold for the control electronics
f
O
: Output frequency
U
UV
PNU b052
PNU b051
PNU b054
PNU b053
PNU b053
U
DC
f
O
t
t
PNU Name Adjustable in RUN mode Value Function WE
Normal Extended
b050 Controlled
deceleration
– – 00 Controlled deceleration is not active. 00
01 Controlled deceleration is active.
b051 Starting
voltage for
deceleration
– – 0 to 1000 V When the internal DC link voltage falls below this value,
controlled deceleration starts
0.0
b052 Voltage for
ramp stop
– – 0 to 1000 V When the internal DC link voltage rises again, the decelera-
tion ramp PNU b053 is interrupted.
0.0
b053 Deceleration
time
– – 0.01 to 3600 s During this time, the motor is decelerated. 1.00
b054 Frequency
jump
– – 0.00 to
10.00 Hz
The frequency inverter reduces the output voltage by this
value so that the motor works in regenerative mode.
0.00
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