Siemens SINAMICS G120XA - CO: VDC Controller Output (U;F); Vdc_Ctrl Output; Open-Loop;Closed-Loop Control Operating Mode; Op;Cl-Lp Ctrl_Mode; Vdc_Min Controller Speed Threshold (U;F); Vdc_Min N_Thresh

Value: 0: Buffer Vdc until undervoltage, n<p1297 -> F07405
1: Buff. Vdc until undervolt., n<p1297 -> F07405, t>p1295 -> F07406
Note
For p1296 = 1:
The quick stop ramp entered in p1135 must not be equal to zero, to prevent overcurrent shutdown if F07406 is triggered.
p1297[0...n] Vdc_min controller speed threshold (U/f) / Vdc_min n_thresh
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 .
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.
r1298 CO: Vdc controller output (U/f) / Vdc_ctrl output
Access level: 3 Calculated: - Data type: FloatingPoint32
Can be changed: - Scaling: p2000 Dynamic index: -
Unit group: 3_1 Unit selection: p0505 Function diagram: 6320, 6854
Min:
- [rpm]
Max:
- [rpm]
Factory setting:
- [rpm]
Description: Displays the actual output of the Vdc controller (DC link voltage controller)
p1300[0...n] Open-loop/closed-loop control operating mode / Op/cl-lp ctrl_mode
Access level: 2 Calculated: - Data type: Integer16
Can be changed: C2(1), T Scaling: - Dynamic index: DDS, p0180
Unit group: - Unit selection: - Function diagram: 6300, 6301,
6851, 8012
Min:
0
Max:
20
Factory setting:
0
Description: Sets the open and closed-loop control mode of a drive.
Value: 0: U/f control with linear characteristic
1: U/f control with linear characteristic and FCC
2: U/f control with parabolic characteristic
4: U/f control with linear characteristic and ECO
7: U/f control for a parabolic characteristic and ECO
20: Speed control (encoderless)
Dependency: For Standard Drive Control (p0096 = 1), settings p1300 = 0, 2 are possible, for Dynamic Drive Control (p0096 = 2) only
p1300 = 20 can be set.
Only operation with U/f characteristic is possible if the rated motor speed is not entered (p0311).
See also: p0300, p0311, p0500
NOTICE
Active slip compensation is required in the U/f control types with Eco mode (p1300 = 4, 7). The scaling of the slip
compensation (p1335) should be set so that the slip is completely compensated (generally 100%).
The Eco mode is only effective in steady-state operation and when the ramp-function generator is not bypassed. In
the case of analog setpoints, if required the tolerance for ramp-up and ramp-down should be actively increased for the
ramp-function generator using p1148 in order to reliably signal a steady-state condition.
Parameters
7.3 Parameters
SINAMICS G120XA converter
Operating Instructions, 03/2019, FW V1.0, A5E44751205B AB 509