6motor interface – Lenze E94AxPExxxx User Manual

Page 256

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6

Motor interface

6.8

Parameterisable additional functions

256

Lenze · 9400 Servo PLC· Reference manual · DMS 4.0 EN · 11/2013 · TD05/06

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Example: Voltage increase in the DC bus when field weakening is switched off
(For instance by an active setting of the controller inhibit or by tripping a fault or error at high motor

speed.)

[6-31] Example: Possible DC-bus voltage > 800 V if field weakening gets lost

Field weakening

Speed n

Motor voltage peak value

Switched off

4000 rpm

560 V

5700 rpm

800 V

6000 rpm

840 V

Switched on

6000 rpm

560 V

• If pulse inhibit occurs at 6000 rpm and switched-on field

weakening, the DC bus is loaded to more than 800 V ().

• A speed limitation to 5700 rpm is required since this speed

causes a DC-bus voltage of 800 V if field weakening is

switched off.

n

U

4000

840 V

560 V

6000

> 800 V

Œ

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