Dynamic Voltage Headroom; Efficiency Optimization - Siemens MICROMASTER 440 Parameter Manual

Parameter Description
P1574[3]

Dynamic voltage headroom

CStat: CUT
P-Group: CONTROL
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

CStat: CUT
P-Group: CONTROL
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
sd
i
sd ,N
P1580 = 100 %
⋅ 5 i
. 0
sd,N
- 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
P 1570
⋅
i
sd N ,
100
i
sd,N
⋅ 5 i
. 0
sd,N
180
Datatype: U16
Active: Immediately
Datatype: U16
Active: Immediately
P1580
P1580 = 0 %
P1580 = x %
i = i
sq sd,N
sd
P1580 = 0 %
P1580 = x %
P1580 = 100 %
i
Unit: V
QuickComm.: No
Unit: %
QuickComm.: No
i
sq
= i i
sq sd ,N N
MICROMASTER 440
Issue 01/06
Level
Min: 0
3
Def: 10
Max: 150
Level
Min: 0
2
Def: 0
Max: 100
i
sq
Parameter List
6SE6400-5BB00-0BP0