8400 StateLine C | Reference manual
Motor control (MCTRL)
Parameterisable additional functions
216 L Firmware ≤ 11.00 - DMS 8.0 EN - 10/2011
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.)
[5-24] 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 (n).
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.
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