Siemens SINAMICS G120 - p1297[0...n] Vdc_min controller speed threshold (U;f); Vdc_min n_thresh; r1298 CO: Vdc controller output (U;f); Vdc_ctrl output; p1300[0...n] Open-loop;closed-loop control operating mode; Op;cl­lp ctrl_mode

Parameters
List of Parameters
1-186
© Siemens AG 2011 All Rights Reserved
SINAMICS G120 / Control Units CU240B/E-2 Parameter Manual (LH11), 01/2011
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 .
Description: Displays the actual output of the Vdc controller (DC link voltage controller)
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
3: U/f control with parameterizable characteristic
4: U/f control with linear characteristic and ECO
5: U/f control for drives requiring a precise freq. (e.g. textiles)
6: U/f control for drives requiring a precise frequency and FCC
7: U/f control for a parabolic characteristic and ECO
19: U/f control with independent voltage setpoint
20: Speed control (encoderless)
22: Torque control (encoderless)
Dependency: Only operation with U/f characteristic is possible if the rated motor speed is not entered (p0311).
Operation with a U/f characteristic is not supported for 1LE4 synchronous motors.
Refer to: p0300, p0311, p0500, p1501
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.
Note: Only by selecting closed-loop speed control (p1300 = 20) is it possible to change over in operation to closed-loop
torque control (p1501). At the changeover, the setting of p1300 does not change. In this case, the actual state is
displayed in r1407, bit 2 and bit 3.
For the open-loop control modes p1300 = 5 and 6 (textile sector), slip compensation p1335, resonance damping
p1338, and the Imax frequency controller are switched off internally so that the output frequency can be set pre-
cisely. The Imax voltage controller remains active.
During operation (the pulses enabled) the open-loop/closed-loop control mode cannot be changed by changing
over drive data sets.
p1297[0...n] Vdc_min controller speed threshold (U/f) / Vdc_min n_thresh
PM240 Access level: 3 Calculated: p0340 = 1 Data type: FloatingPoint32
Can be changed: U, T Scaling: - Data set: DDS, p0180
Units group: 3_1 Unit selection: p0505
Min Max Factory setting
0.00 [rpm] 210000.00 [rpm] 50.00 [rpm]
r1298 CO: Vdc controller output (U/f) / Vdc_ctrl output
PM230
PM240
Access level: 3 Calculated: - Data type: FloatingPoint32
Can be changed: - Scaling: p2000 Data set: -
Units group: 3_1 Unit selection: p0505
Min Max Factory setting
- [rpm] - [rpm] - [rpm]
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: C(1), T Scaling: - Data set: DDS, p0180
Units group: - Unit selection: -
Min Max Factory setting
0 22 0