01/02 AWB8230-1413GB
Controlled deceleration
141
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
excessively high, the deceleration ramp is interrupted until the
voltage falls below the threshold defined under PNU b052.
Figure 148: Function chart for controlled deceleration
U
DC
: Internal DC link voltage
U
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
deceleration 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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