Siemens SINAMICS G120XA - Vdc_Max Controller Speed Threshold; Vdc_Max N_Thresh; Vdc_Min Controller Dynamic Factor (Kinetic Buffering); Vdc_Min Controller Switch-In Level (Kinetic Buffering)

p1245[0...n] Vdc_min controller switch-in level (kinetic buffering) / Vdc_min on_level
CUG120XA_USS
(Vdc_min)
Access level: 3 Calculated: - Data type: FloatingPoint32
Can be changed: T, U Scaling: - Dynamic index: DDS, p0180
Unit group: - Unit selection: - Function diagram: -
Min:
65 [%]
Max:
150 [%]
Factory setting:
76 [%]
Description: Sets the switch-in level for the Vdc-min controller (kinetic buffering).
The value is obtained as follows:
r1246[V] = p1245[%] * sqrt(2) * p0210
Dependency: See also: p0210
WARNING
An excessively high value possibly negatively influences normal drive operation, and can mean that after the line
supply returns, the Vdc minimum control can no longer be exited.
r1246 Vdc_min controller switch-in level (kinetic buffering) / Vdc_min on_level
CUG120XA_USS
(Vdc_min)
Access level: 3 Calculated: - Data type: FloatingPoint32
Can be changed: - Scaling: p2001 Dynamic index: -
Unit group: - Unit selection: - Function diagram: 6220
Min:
- [V]
Max:
- [V]
Factory setting:
- [V]
Description: Displays the switch-in level for the Vdc_min controller (kinetic buffering).
Note
The Vdc_min controller is not switched back off until the DC link voltage rises above the threshold 1.05 * p1246 and the
controller output is zero.
p1247[0...n] Vdc_min controller dynamic factor (kinetic buffering) / Vdc_min dyn_factor
CUG120XA_USS
(PM330, Vdc_min,
Vdc_min)
Access level: 3 Calculated: CALC_MOD_CON Data type: FloatingPoint32
Can be changed: T, U Scaling: - Dynamic index: DDS, p0180
Unit group: - Unit selection: - Function diagram: 6220
Min:
1 [%]
Max:
10000 [%]
Factory setting:
300 [%]
Description: Sets the dynamic factor for the Vdc_min controller (kinetic buffering).
100% means that p1250, p1251, and p1252 (gain, integral time, and rate time) are used corresponding to their basic
settings and based on a theoretical controller optimization.
If subsequent optimization is required, this can be carried out using the dynamic factor. In this case p1250, p1251,
p1252 are weighted with the dynamic factor p1247.
p1249[0...n] Vdc_max controller speed threshold / Vdc_max n_thresh
CUG120XA_USS
(Vdc_max)
Access level: 3 Calculated: CALC_MOD_ALL Data type: FloatingPoint32
Can be changed: T, U Scaling: - Dynamic index: DDS, p0180
Unit group: 3_1 Unit selection: p0505 Function diagram: -
Min:
0.00 [rpm]
Max:
210000.00 [rpm]
Factory setting:
10.00 [rpm]
Description: Sets the lower speed threshold for the Vdc_max controller.
When this speed threshold is undershot, the Vdc_max control is switched out and the speed is controlled using the
ramp-function generator.
Note
For fast braking where the ramp-function generator tracking was active, it is possible to prevent the drive rotating in the
opposite direction by increasing the speed threshold and setting a final rounding-off time in the ramp-function generator
(p1131). This is supported using a dynamic setting of the speed controller.
Parameters
7.3 Parameters
SINAMICS G120XA converter
Operating Instructions, 03/2019, FW V1.0, A5E44751205B AB 499