Siemens G130 List Manual page 419

p1579[0...n] Flux reduction flux build-up smoothing time / Flux red up t_sm
VECTOR_G (n/M) Can be changed: U, T
Data type: FloatingPoint32
P-Group: Closed-loop control
Not for motor type: ASM, PMSM, SESM,
REL
Min
0 [ms]
Description: Sets the smoothing time for the flux setpoint for the flux build-up due to flux reduction (p1581 < 100 %).
Dependency: Refer to: p1578
Note: An excessively long smoothing time extends the time until the maximum torque is reached from the no-load phase.
p1580[0...n] Efficiency optimization / Efficiency opt.
VECTOR_G (n/M) Can be changed: U, T
Data type: FloatingPoint32
P-Group: Closed-loop control
Not for motor type: PMSM, SESM, REL
Min
0 [%]
Description: Sets the efficiency optimization.
When optimizing the efficiency, the flux setpoint of the closed-loop control is adapted as a function of the load.
For p1580 = 100 %, under no-load operating conditions, the flux setpoint is reduced to 50 % of the rated motor flux.
Note: It only makes sense to activate this function if the dynamic response requirements of the speed controller are low.
In order to avoid oscillations, if required, the speed controller parameters should be adapted (increase Tn, reduce
Kp).
Further, the smoothing time of the flux setpoint filter (p1582) should be increased.
p1581[0...n] Flux reduction factor / Flux red factor
VECTOR_G (n/M) Can be changed: U, T
Data type: FloatingPoint32
P-Group: Closed-loop control
Not for motor type: ASM, PMSM, SESM,
REL
Min
0 [%]
Description: Sets the factor to which the flux is reduced under no-load conditions.
For a value of 100%, the flux reduction is switched out.
This parameter refers to the flux saved in the field weakening characteristic.
By reducing the flux, the losses in induction motors can be reduced under no-load conditions or at low torques.
However, the time it takes to reach the maximum torque is extended.
Recommendation: For induction motors with closed rotor slots, we recommend that the integral time of the current controller (p1717) is
e.g. increased to three times the value.
For stable operation, the maximum field-weakening factor in operation with an encoder must be less than 16 and in
operation without an encoder must be less than 4. Lower field weakening factors are recommended. The field
weakening factor is calculated as follows:
(p1082 * 100 % * 600 V) / (p0348 * p1581 * p0070)
In order to reduce losses due to magnetizing and de-magnetizing, we recommend that the smoothing times are
adapted for flux decrease (p1578) and flux build-up (p1579).
In order to reduce the losses as a result of building-up and reducing the torque, we recommend that the torque
setpoint is smoothed (current setpoint filter (p1656 ...) or speed actual value filter (p1441)).
SINAMICS G130/G150
List Manual (LH2), 07/2016, A5E03263479A
Calculated: CALC_MOD_CON
Dyn. index: DDS, p0180
Unit group: -
Scaling: -
Max
5000 [ms]
Calculated: -
Dyn. index: DDS, p0180
Unit group: -
Scaling: -
Max
100 [%]
Calculated: -
Dyn. index: DDS, p0180
Unit group: -
Scaling: -
Max
100 [%]
2 Parameters
2.2 List of parameters
Access level: 3
Func. diagram: 6791
Unit selection: -
Expert list: 1
Factory setting
4 [ms]
Access level: 2
Func. diagram: 6722
Unit selection: -
Expert list: 1
Factory setting
0 [%]
Access level: 3
Func. diagram: -
Unit selection: -
Expert list: 1
Factory setting
100 [%]
419