5motor control (mctrl) – Lenze 8400 TopLine User Manual
Page 279
Lenze · 8400 TopLine · Reference manual · DMS 6.0 EN · 06/2014 · TD05/TD14
279
5
Motor control (MCTRL)
5.10
Parameterisable additional functions
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
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.)
[5-28] 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
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