Siemens SINAMICS V20 - Page 267

Parameter list
8.2 Parameter list
SINAMICS V20 Converter
Operating Instructions, 10/2019, A5E34559884-012
265
Parameter
Function
Range
Factory
default
Can be
changed
Scaling
Data set
Data
type
Acc.
Level
P1240[0...2]
Configuration of Vdc
controller
0 - 3 1 C, T - DDS U16 3
Enables/disables Vdc controller. The Vdc controller dynamically controls the DC link voltage to prevent
overvoltage trips on high inertia systems.
0
Vdc controller disabled
1
Vdc_max controller enabled
2
Kinetic buffering (Vdc_min controller) enabled
3
Vdc_max controller and kinetic buffering (KIB) enabled
Caution:
If P1245 increased too much, it may interfere with the converter normal operation.
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 converter. If the con-
verter trips with F3 immediately, try increasing the dynamic factor P1247 first. If still tripping with F3 try
then increasing the switch on level P1245.
r1242
CO: Switch-on level
of Vdc_max [V]
- - - - - Float 3
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 [%]
10 - 200 100 U, T - DDS U16 3
Defines dynamic factor for DC link controller.
Dependen-
cy:
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 converter data.
P1245[0...2]
Switch on level kinet-
ic buffering [%]
65 - 95 76 U, T - DDS U16 3
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 converter 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]
- - - - DDS Float 3
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 converter trips with un-
dervoltage.