Siemens Sinamics G120 Series Parameter Manual page 147
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p1240[0...2]
Configuration of Vdc controller / Vdc controller
PM240
Access level: 3
Quick comm. NO
Can be changed: C, T
Min
0
Description:
Enables / disables Vdc controller.
The Vdc controller dynamically controls the DC link voltage to prevent overvoltage trips on high inertia systems.
Values:
0:
1:
2:
3:
Caution:
If P1245 increased too much, it may interfere with the drive 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 drive. If the drive trips with F0003
immediately, try increasing the dynamic factor P1247 first. If still tripping with F0003 try then increasing the
switch on level P1245.
r1242
CO: Switch-on level of Vdc-max / Vdc-max ON lev
PM240
Access level: 3
Unit: [V]
Displays switch-on level of Vdc max controller.
Description:
Following equation is only valid, if p1254 = 0 :
r1242
otherwise :
r1242 is internally calculated
p1243[0...2]
Dynamic factor of Vdc-max / Vdc-max dyn. fact.
PM240
Access level: 3
Quick comm. NO
Can be changed: C, U, T
Min
10 [%]
Defines dynamic factor for DC link controller in [%].
Description:
Dependency:
P1243 = 100 % means parameters 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.
© Siemens AG 2007 All Rights Reserved
SINAMICS G120 Control Units CU240S, Edition 05/2007
Vdc controller disabled
Vdc-max controller enabled
Kinetic buffering (Vdc-min controller) enabled
Vdc-max controller and kinetic buffering (KIB) enabled
=
1.15
⋅
2
⋅
V
. 1
15
=
mains
P-Group: -
Active: YES
Max
3
P-Group: -
⋅
2
⋅
p
0210
P-Group: -
Active: YES
Max
200 [%]
Parameters
List of Parameters
Data type: Unsigned16
Data set: DDS
Factory setting
1
Data type: Floating Point
Data set: -
Data type: Unsigned16
Data set: DDS
Factory setting
100 [%]
1-147
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