Parameter Description

Issue 01/06

r1482

CO: Integral output of n-ctrl.

 

Min:

-

 

Datatype: Float

Unit: Nm

Def:

-

 

P-Group: CONTROL

 

Max:

-

Displays integral part of speed controller output.

Level

3

3.29.2.2Droop

P1488[3] Droop input source

 

 

Min:

0

CStat:

CUT

Datatype: U16

Unit: -

Def:

0

P-Group:

CONTROL

Active: first confirm

QuickComm.: No

Max:

3

Selects source of droop input signal.

Level

3

With mechanically coupled motors it is very important that an even load distribution is applied to each motor. The load sharing can be achieved by enabling the droop function on both inverters.

0

Enable droop

0

 

0 ... 1

 

P1492.D (0)

 

r1170

 

Freq. setpoint

r0063

Act. frequency

 

Droop input source

Droop scaling

0 ... 3

P1488.D (0)

 

 

0.0 ... 0.50

 

 

 

 

 

 

P1489.D (0.05)

 

0

 

 

 

 

 

 

 

 

 

CO: Droop freq. [Hz]

 

 

0

 

 

 

 

r1490

 

 

1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2

 

 

 

 

 

 

 

3

r1482

 

 

1

 

 

 

 

 

 

Pre-

 

 

 

 

 

 

 

 

 

 

 

 

 

 

control

 

r1538

 

 

 

 

 

 

 

 

 

 

*)

 

PI

 

r1538

r1538

 

 

Filter

 

Speed

r1539

 

 

 

 

 

controller

 

 

Torque

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Filter

 

 

 

r1539

r1539

setpoint

 

 

 

 

r1508

 

r0079

 

 

 

 

 

 

*) only active, if pre-control is enabled (P1496 > 0)

1.Droop is applied as a frequency setpoint on each inverter.

The droop increases the slip via the negative feedback of the torque setpoint to the frequency setpoint. In a steady-state an even load distribution can be achieved if the slip characteristics are identical.

-P1488 > 0

-P1489 > 0

-P1492 = 1

2.Droop can act as a setpoint or limitation for a group of inverters (i.e. master-slave inverters)

By use of the master-slave inverter technique an even load distribution is achieved across the whole application.

This is accomplished by setting the torque setpoint (r1490) on the master inverter which then controls the frequency of the master inverter and all connected slave inverters.

-P1488 > 0

-P1489 > 0

-P1492 = 0

Possible Settings:

0Droop input disabled

1Torque setpoint

2Speed controller output

3Speed controller integral output

Index:

P1488[0] : 1st. Drive data set (DDS)

P1488[1] : 2nd. Drive data set (DDS)

P1488[2] : 3rd. Drive data set (DDS)

Dependency:

Droop scaling (P1489) must be > 0 for droop to be effective.

170

MICROMASTER 440 Parameter List

6SE6400-5BB00-0BP0

Page 170
Image 170
Siemens 440 manual R1482 CO Integral output of n-ctrl, P14883 Droop input source, 170