Siemens 440 - Manual (Page 180)

Parameter Description Issue 01/06
MICROMASTER 440 Parameter List
180 6SE6400-5BB00-0BP0
P1574[3] Dynamic voltage headroom Min: 0
CStat: CUT Datatype: U16 Unit: V Def: 10
P-Group: CONTROL Active: Immediately QuickComm.: No Max: 150
Sets dynamic voltage headroom for vector control.
If max. output voltage is reached, the voltage headroom is used for balancing lead values and disturbances.
Parameter P1574 gives a control-reserve, that is valid also in field weakening
Index:
P1574[0] : 1st. Drive data set (DDS)
P1574[1] : 2nd. Drive data set (DDS)
P1574[2] : 3rd. Drive data set (DDS)
Note:
- Increasing of the reserve decreases the maximum output voltage (r0071).
- Decreasing the voltage headroom can lead to instabilities of the control.
P1580[3] Efficiency optimization Min: 0
CStat: CUT Datatype: U16 Unit: % Def: 0
P-Group: CONTROL Active: Immediately QuickComm.: No Max: 100
The efficiency for load-dependent magnetization can be optimized using parameter P1580.
P1580 = 0% :
No load-dependent magnetization (de-activated)
P1580 > 0% :
Load-dependent magnetization activated
When the flux is decreased, the motor stator losses in the partial load range are reduced. When the load
increases, the setpoint flux increases and therefore the magnetizing current corresponding to the torque-
generating current.
Index:
P1580[0] : 1st. Drive data set (DDS)
P1580[1] : 2nd. Drive data set (DDS)
P1580[2] : 3rd. Drive data set (DDS)
Note:
- When using the optimization routine, it is necessary to increase the smoothing time of the flux setpoint
(P1582).
- The load-dependent magnetization (P1580 > 0) in the partial load range restricts the dynamic
performance of the drive.
- Under no-load conditions, a value of 100 % represents the full flux reduction (i.e. 50 % of the rated
motor flux, refer to the diagram).
i
sq
= i
sd,N
P1580
i
sq
i
sd ,N
i
sd
P1580 = 0 %
P1580 = 100 %
P1580 = x %
i
sd,N
⋅ 5 . 0
-
P1580 can be activated at the same time with P1570. This allows an optimum adaptation both under
no-load conditions/in the partial load range using P1580 as well as in the full load range using P1570.
i
sq
= i
sd ,N
i
sq
i
sd,N
i
sd
P1580 = 0 %
P1580 = 100 %
P1580 = x %
i
sd,N
⋅ 5 . 0
i
100
1570 P
N , sd
⋅
i
N
Level
3
Level
2