Lenze 4800 Manual page 290

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Selection aid
14-2
48XX/49XXSHB0399
Stop!
The peak values of the mains voltage are also reached with low armature voltages
(speed).
3. Rated armature current of the motor > rated armature current of the
controller for continuous operation. The motor cannot be fully driven in
continuous operation at this torque. The current is limited to the rated
aramture current. The torque is proportional to the armature current at
constant excitation.
Note!
With this assignment, the armature circuit gain is increased. This may lead to
overcurrents in the armature circuit, which may even cause fuse tripping. For
these application, please contact Lenze.
4. Rated armature current of the motor < rated armature current of the
controller for continuous operation. In this case, the current limitation
I (C022, C023) of the controller should be reduced to the motor
max
current to avoid thermal overload of the motor caused by impermissibly
high currents. If the difference is too high, use a smaller controller.
Note!
The current controller of 48XX/49XX controller is default-set for the application of
adapted machines. In some cases (e.g. high ratio of electrical rated data between
controller and DC machine, high dynamic control requirements) it can be
necessary to optimise the current-control circuit. For these applications, please
contact Lenze.