Siemens SINAMICS V20 Operating Instructions Manual page 215

Parameter Function
Displays switch-on level of Vdc_max controller.
Following equation is only valid, if P1254 = 0:
r1242 = 1.15 * sqrt(2) * V_mains = 1.15 * sqrt(2) * P0210
otherwise r1242 is internally calculated.
P1243[0...2] Dynamic factor of
Vdc_max [%]
Defines dynamic factor for DC link controller.
Dependency: P1243 = 100 % means P1250, P1251 and P1252 (gain, integration time and differential time) are used as
set. Otherwise, these are multiplied by P1243 (dynamic factor of Vdc_max).
Note: Vdc controller adjustment is calculated automatically from motor and inverter data.
P1245[0...2] Switch on level kinetic
buffering [%]
Enter switch-on level for kinetic buffering (KIB) in [%] relative to supply voltage (P0210).
r1246[V] = (P1245[%] / 100) * sqrt(2) * P0210
Warning: Increasing the value too much, may interfere with the inverter normal operation.
Note: P1254 has no effect on the switch-on-level for kinetic buffering.
P1245 default for the single phase variants is 74%.
r1246[0...2] CO: Switch-on level kinet-
ic buffering [V]
Displays switch-on level of kinetic buffering (KIB, Vdc_min controller). If the dc-link voltage drops below the
value in r1246, kinetic buffering will be activated. That means the motor frequency will be reduced in order
to keep Vdc within the valid range. If there is not enough regenerative energy, the inverter trips with un-
dervoltage.
P1247[0...2] Dynamic factor of kinetic
buffering [%]
Enters dynamic factor for kinetic buffering (KIB, Vdc_min controller). P1247 = 100 % means P1250, P1251
and P1252 (gain, integration time and differential time) are used as set. Otherwise, these are multiplied by
P1247 (dynamic factor of Vdc_min).
Note: Vdc controller adjustment is calculated automatically from motor and inverter data.
P1250[0...2] Gain of Vdc controller
Enters gain for Vdc controller.
P1251[0...2] Integration time Vdc con-
troller [ms]
Enters integral time constant for Vdc controller.
P1252[0...2] Differential time Vdc con-
troller [ms]
Enters differential time constant for Vdc controller.
P1253[0...2] Vdc controller output limi-
tation [Hz]
Limits maximum effect of Vdc_max controller.
Dependency: This parameter is influenced by automatic calculations defined by P0340.
Note: The Factory setting depends on inverter power.
P1254 Auto detect Vdc switch-on
levels
Enables / disables auto-detection of switch-on levels for Vdc_max controller. For best results, it is recom-
mended to set P1254 = 1 (auto-detection of Vdc switch-on levels enabled). Setting P1254 = 0 is only rec-
ommended when there is a high degree of fluctuation of the DC-link when the motor is being driven. Note
that the auto detection only works when the inverter has been in standby for over 20s.
0
1
SINAMICS V20 Inverter
Operating Instructions, 09/2014, A5E34559884
Range Factory Can be
default changed
10 - 200 100 U, T
65 - 95 76 U, T
- - -
10 - 200 100 U, T
0.00 - 10.00 1.00 U, T
0.1 - 1000.0 40.0 U, T
0.0 - 1000.0 1.0 U, T
0.00 - 10.00 U, T
550.00
0 - 1 1 C, T
Disabled
Enabled
Parameter list
7.2 Parameter list
Scaling Data Data
set type
- DDS U16
- DDS U16
- DDS Float
- DDS U16
- DDS Float
- DDS Float
- DDS Float
- DDS Float
- - U16
Acc.
Level
3
3
3
3
3
3
3
3
3
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