Siemens 440 manual P15743 Dynamic voltage headroom, P15803 Efficiency optimization, 180

Parameter Description Issue 01/06

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.

Level

3

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

Level

2

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).

isd	P1580
isd ,N	P1580	= 0 %
	P1580 = x %
0.5 ⋅ isd,N	P1580 = 100 %
		isq
		isq = isd,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.

	isd
P1570	⋅ isd,N
100
	P1580 = 0 %
	isd,N
	P1580 = x %
	P1580 = 100 %
0.5 ⋅ isd,N
	isq = isd ,N	isq
		iN

180	MICROMASTER 440 Parameter List
	6SE6400-5BB00-0BP0