Siemens SINAMICS S110 List Manual page 260

Parameter
List of parameters
p1578[0...n] Flux reduction flux decrease smoothing time / Flux red dec t_sm
SERVO_S110-CAN, Can be changed: U, T
SERVO_S110-DP,
Data type: FloatingPoint32
SERVO_S110-PN
P-Group: Closed-loop control
Not for motor type: PEM, REL, FEM
Min
20 [ms]
Description: Sets the smoothing time for the flux setpoint when decreasing the flux due to flux reduction (p1581 < 100 %).
Dependency: Refer to: p1579, p1581
p1579[0...n] Flux reduction flux build-up smoothing time / Flux red up t_sm
SERVO_S110-CAN, Can be changed: U, T
SERVO_S110-DP,
Data type: FloatingPoint32
SERVO_S110-PN
P-Group: Closed-loop control
Not for motor type: PEM, REL, FEM
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, p1581
Note: An excessively long smoothing time extends the time until the maximum torque is reached from the no-load phase.
p1581[0...n] Flux reduction factor / Flux red factor
SERVO_S110-CAN, Can be changed: U, T
SERVO_S110-DP,
Data type: FloatingPoint32
SERVO_S110-PN
P-Group: Closed-loop control
Not for motor type: PEM, REL, FEM
Min
20 [%]
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.
Recommend.: 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 set-
point is smoothed (current setpoint filter (p1656 ...) or speed actual value filter (p1441)).
Dependency: Refer to: p1578, p1579
Note: It only makes sense to activate this function if there are low dynamic requirements placed on the speed controller
and there are frequent phases with a low load.
In order to avoid oscillations, if required, the speed controller parameters should be adapted (decrease Kp (p1460,
p1470), increase Tn (p1462, p1472)).
When used without an encoder, flux reduction is not possible for induction motors with closed rotor slots.
1-260
Calculated: CALC_MOD_REG
Dynamic index: DDS, p0180
Units group: -
Scaling: -
Max
5000 [ms]
Calculated: CALC_MOD_REG
Dynamic index: DDS, p0180
Units group: -
Scaling: -
Max
5000 [ms]
Calculated: -
Dynamic index: DDS, p0180
Units group: -
Scaling: -
Max
100 [%]
© Siemens AG 2012 All Rights Reserved
SINAMICS S110 List Manual (LH7), 06/2012, 6SL3097-4AP10-0BP3
Access level: 3
Func. diagram: 5722
Unit selection: -
Expert list: 1
Factory setting
200 [ms]
Access level: 3
Func. diagram: 5722
Unit selection: -
Expert list: 1
Factory setting
4 [ms]
Access level: 2
Func. diagram: 5722
Unit selection: -
Expert list: 1
Factory setting
100 [%]