Lenze 8400 motec - Manual (Page 143)

Lenze · 8400 motec · Reference manual · DMS 4.1 EN · 08/2013 · TD05 143
5 Motor control (MCTRL)
5.9 Sensorless control for synchronous motors (SLPSM)
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• In C000937/1 , the actually used maximally effective field-producing motor current is displayed.
• With switched-on and active field weakening: 0.00 A ... -x.xx A
• With sensorless control for synchronous motors (SLPSM), the injected current is displayed in
open-loop controlled operation: 0.00 A ... +x.xx A
• If neither field weakening nor open-loop controlled operation are active,e "0.00 A" is
displayed.

Note!
If a Lenze motor is used:
The controller is automatically parameterised so that field weakening operates
optimally and the maximally permissible speed is monitored.

Stop!
If an OEM motor is used:
If pulse inhibit is set in the controller, the DC bus is loaded with the voltage that
corresponds to the current speed of the machine.
Since with switched-on field weakening higher speeds can be achieved at a
correspondingly higher rotor voltage of the motor, the DC bus can be loaded to a voltage
higher than the set DC-bus voltage in case of pulse inhibit and a currently high motor
speed and even exceed the maximally permissible voltage of 800 V!
For device protection, either use a brake chopper or parameterise the motor speed
monitoring via C00965 in such a way that only a maximum speed is possible which
would be also reachable without field weakening with a DC-bus voltage of = 800 V.
 Motor speed monitoring ( 180)