Siemens SINAMICS V20 Operating Instructions Manual page 251

Parameter Function
Note:
Vdc_max controller:
•
Vdc_max controller automatically increases ramp-down times to keep the DC-link voltage (r0026) within
limits (r1242).
Vdc_min controller:
•
Vdc_min is activated if DC-link voltage falls below the switch on level P1245. The kinetic energy of the
motor is then used to buffer the DC-link voltage, thus causing deceleration of the inverter. If the inverter
trips with F3 immediately, try increasing the dynamic factor P1247 first. If still tripping with F3 try then in-
creasing the switch on level P1245.
r1242 CO: Switch-on level of
Vdc_max [V]
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
kinetic 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
controller [ms]
Enters integral time constant for Vdc controller.
SINAMICS V20 Inverter
Operating Instructions, 11/2016, A5E34559884-006
Range Factory
default
- -
10 - 200 100
65 - 95 76
- -
10 - 200 100
0.00 - 10.00 1.00
0.1 - 1000.0 40.0
Can be Scaling
changed
- -
U, T -
U, T -
- -
U, T -
U, T -
U, T -
Parameter list
8.2 Parameter list
Data Data Acc.
set type Level
- Float 3
DDS U16 3
DDS U16 3
DDS Float 3
DDS U16 3
DDS Float 3
DDS Float 3
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