Siemens SINAMICS G120X - VDC Controller Integral Time; Vdc_Ctrl Tn; VDC Controller Proportional Gain; Vdc_Ctrl Kp; Vdc_Max Controller Speed Threshold; Vdc_Max N_Thresh

p1249[0...n] Vdc_max controller speed threshold / Vdc_max n_thresh
Access level: 4 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.
p1249[0...n] Vdc_max controller speed threshold / Vdc_max n_thresh
G120X_DP
(Vdc_max),
G120X_PN
(Vdc_max),
G120X_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.
p1250[0...n] Vdc controller proportional gain / Vdc_ctrl Kp
Access level: 3 Calculated: - Data type: FloatingPoint32
Can be changed: T, U Scaling: - Dynamic index: DDS, p0180
Unit group: - Unit selection: - Function diagram: -
Min:
0.00
Max:
100.00
Factory setting:
1.00
Description: Sets the proportional gain for the DC link voltage controller (Vdc_min controller, Vdc_max controller).
Dependency: The effective proportional gain is obtained taking into account p1243 (Vdc_max controller dynamic factor) and the DC
link capacitance of the power unit.
p1251[0...n] Vdc controller integral time / Vdc_ctrl Tn
Access level: 3 Calculated: - Data type: FloatingPoint32
Can be changed: T, U Scaling: - Dynamic index: DDS, p0180
Unit group: - Unit selection: - Function diagram: 6220
Min:
0 [ms]
Max:
10000 [ms]
Factory setting:
0 [ms]
Description: Sets the integral time for the DC link voltage controller (Vdc_min controller, Vdc_max controller).
Dependency: The effective integral time is obtained taking into account p1243 (Vdc_max controller dynamic factor).
Note
p1251 = 0: The integral component is deactivated.
Parameters
7.2 Parameter list
SINAMICS G120X converter
Operating Instructions, 06/2019, FW V1.01, A5E44751209B AC 657