Lenze DSD Manual de usuario descargar pdf (Pagina 432)

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101

17 Restrictions of the drive dimensioning

17.10 Displacement of the M-n characteristic

432

Lenze · Drive Solution Designer · Manual · DMS 4.2 EN · 12/2013 · TD23

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17.10 Displacement of the M-n characteristic

If the max. available output voltage on the inverter is lower than the rated motor voltage, field

weakening already starts below the rated motor speed.

• The output voltage on the inverter depends on the mains voltage.

• Depending on the max. output voltage on the inverter, the available torque decreases.

• In overboost operation (M > M

), this effect is particularly distinctive.

• Possible causes are:

• Mains undervoltage

• Voltage drop on filters, chokes. The components are only considered in DSD if they are man-

datory for operation.

• Voltage drop on long motor cables

• The operating voltages of the inverter and motor (U

mot

mains

) are not optimally assigned,

e. g. 460 V motor on the inverter with 400 V mains supply.

[17-4] Maximum and continuous torques

 Note!

Only relevant for inverter-motor combinations which are not adjusted to each other as

regards voltage (output voltage of inverter < motor voltage).

 Motor characteristic 360 V mains voltage

 Motor characteristic 400 V mains voltage

 Motor characteristic 440 V mains voltage

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