Lenze 9400 - Manual (Page 208)

5 Motor interface
5.8 Parameterisable additional functions
208
Lenze · Servo-Inverter 9400 HighLine · Reference manual · DMS 10.0 EN · 11/2013 · TD05/06
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
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.)
[5-31] 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 is set at 6000 rpm and switched-on field
weakening, the DC bus is charged to over 800 V ().
• A speed limitation to 5700 rpm is required, as this speed
generates a DC-bus voltage of 800 V when the field
weakening mode is switched off.
n
U
4000
840 V
560 V
6000
> 800 V
Œ