Siemens SINAMICS G120XA - Bypass Configuration; Bypass Config; CO: VDC Controller Output; Vdc_Ctrl Output; Vdc_Min Controller Response (Kinetic Buffering); Vdc_Min Response; Vdc_Min Controller Speed Threshold; Vdc_Min N_Thresh

Dependency: See also: F07406
NOTICE
If a time threshold has been parameterized, the Vdc_max controller should also be activated (p1240 = 3) so that the
drive does not shut down with overvoltage when Vdc_min control is exited (due to the time violation) and in the event
of fault response OFF3. It is also possible to increase the OFF3 ramp-down time p1135.
p1256[0...n] Vdc_min controller response (kinetic buffering) / Vdc_min response
CUG120XA_USS
(Vdc_min)
Access level: 3 Calculated: - Data type: Integer16
Can be changed: T, U Scaling: - Dynamic index: DDS, p0180
Unit group: - Unit selection: - Function diagram: -
Min:
0
Max:
1
Factory setting:
0
Description: Sets the response for the Vdc_min controller (kinetic buffering).
Value: 0: Buffer Vdc until undervoltage, n<p1257 -> F07405
1: Buff. Vdc until undervolt., n<p1257 -> F07405, t>p1255 -> F07406
Dependency: See also: F07405, F07406
p1257[0...n] Vdc_min controller speed threshold / Vdc_min n_thresh
CUG120XA_USS
(Vdc_min)
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:
50.00 [rpm]
Description: Sets the speed threshold for the Vdc-min controller (kinetic buffering).
If this value is exceeded a fault is output; the required response can be parameterized .
Kinetic buffering is not started below the speed threshold.
Note
Exiting the Vdc_min control before reaching motor standstill prevents the regenerative braking current from increasing
significantly at low speeds, and after a pulse inhibit, means that the motor coasts down.
However, the maximum braking torque can be set via the appropriate torque limiting.
r1258 CO: Vdc controller output / Vdc_ctrl output
Access level: 3 Calculated: - Data type: FloatingPoint32
Can be changed: - Scaling: p2002 Dynamic index: -
Unit group: 6_2 Unit selection: p0505 Function diagram: 6220
Min:
- [Arms]
Max:
- [Arms]
Factory setting:
- [Arms]
Description: Displays the actual output of the Vdc controller (DC link voltage controller)
Note
The regenerative power limit p1531 is used for vector control to precontrol the Vdc_max controller. The lower the power
limit is set, the lower the correction signals of the controller when the voltage limit is reached.
p1260 Bypass configuration / Bypass config
Access level: 2 Calculated: - Data type: Integer16
Can be changed: T Scaling: - Dynamic index: -
Unit group: - Unit selection: - Function diagram: -
Min:
0
Max:
3
Factory setting:
0
Description: Sets the configuration for the bypass function.
Parameters
7.3 Parameters
SINAMICS G120XA converter
Operating Instructions, 03/2019, FW V1.0, A5E44751205B AB 501