Siemens SINAMICS G120 Manual page 175

p1280[0...n] Vdc controller or Vdc monitoring configuration (U/f) / Vdc_ctr config U/f
PM240 Access level: 3
Can be changed: U, T
Units group: -
Min
0
Description: Sets the configuration of the controller for the DC link voltage (Vdc controller) in the U/f operating mode.
Value: 0:
1:
2:
3:
Note: For high input voltages (see p0210), the following settings can improve the degree of ruggedness of the Vdc_max
controller:
- Set the input voltage p0210 as low as possible (in so doing avoid A07401).
- Set the rounding times (p1130, p1136).
- Increase the ramp-down times (p1121).
- Reduce the integral time of the controller (p1291) (factor 0.5).
- Activate the Vdc correction in the current controller (p1810 bit 1 = 1) or reduce the derivative action time of the
controller (p1292) (factor 0.5).
In this case, we generally recommend to use vector control (p1300 = 20) (Vdc controller, see p1240).
The following measures are suitable to improve the Vdc_min controller:
- Optimize the Vdc_min controller (see p1287).
- Activate the Vdc correction in the current controller (p1810 bit 1 = 1).
r1282 Vdc_max controller switch-in level (U/f) / Vdc_max on_level
PM230 Access level: 3
PM240
Can be changed: -
Units group: -
Min
- [V]
Description: Displays the switch-in level for the Vdc_max controller.
If p1294 = 0 (automatic sensing of the switch-in level = off), then the following applies:
r1282 = 1.15 * sqrt(2) * V_mains = 1.15 * sqrt(2) * p0210 (supply voltage)
If p1294 = 1 (automatic sensing of the switch-in level = on), then the following applies:
r1282 = Vdc_max - 50.0 V (Vdc_max: Overvoltage threshold of the power unit)
Note: The Vdc_max controller is not switched back off until the DC-link voltage falls below the threshold 0.95 * p1282 and
the controller output is zero.
p1283[0...n] Vdc_max controller dynamic factor (U/f) / Vdc_max dyn_factor
PM230 Access level: 3
PM240
Can be changed: U, T
Units group: -
Min
1 [%]
Description: Sets the dynamic factor for the DC link voltage controller (Vdc_max controller).
100% means that p1290, p1291, and p1292 (gain, integral time, and rate time) are used in accordance with their
basic settings and on the basis of a theoretical controller optimization.
If subsequent optimization is required, this can be carried out using the dynamic factor. In this case, p1290, p1291,
and p1292 are weighted with the dynamic factor p1283.
© Siemens AG 2011 All Rights Reserved
SINAMICS G120 Control Units CU230P-2 Parameter Manual (LH9), 01/2011
Inhib Vdc ctrl
Vdc_max controller enable
Vdc_min controller (kinetic buffering) enable
Vdc_min controller and Vdc_max controller enable
Calculated: -
Scaling: -
Unit selection: -
Max
3
Calculated: -
Scaling: p2001
Unit selection: -
Max
- [V]
Calculated: p0340 = 1,3,4
Scaling: -
Unit selection: -
Max
10000 [%]
Parameters
List of Parameters
Data type: Integer16
Data set: DDS, p0180
Factory setting
1
Data type: FloatingPoint32
Data set: -
Factory setting
- [V]
Data type: FloatingPoint32
Data set: DDS, p0180
Factory setting
100 [%]
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