Lenze DSD - Manual (Page 438)

17 Restrictions of the drive dimensioning
17.20 Applications with low field frequencies
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Lenze · Drive Solution Designer · Manual · DMS 4.2 EN · 12/2013 · TD23
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17.20 Applications with low field frequencies
Low output frequencies are to be expected in particular if the motor is loaded at standstill or at very
low speeds (f
d
< 1 Hz).
• During longer operation in this range, inverter and motor may be thermally overloaded.
17.21 Emergency-off scenarios
For specific applications, information is required on how fast the drive can be stopped in emergency
situations under defined conditions.
• This calculation currently is not yet integrated in the DSD.

Tip!
Emergency stop scenarios can be calculated with the Application Tuner by changing the
motion profile with the emergency stop times. That way, you can check whether the drive
will still be able to handle the emergency stop scenarios. Application Tuner ( 59)
17.22 Switching in the motor cable
This check has to be carried out manually:
If several motors are operated parallel at the output of an inverter (group drives), and if they are
switched via contactor while a current is applied, further checks have to be carried out.
17.23 Filter in the motor cable
Reasons for the use of filters in the motor cable:
• An increase of the maximally permissible cable length.
• Avoiding the use of shielded motor cables.
• Protection of the motor winding against too high speeds for voltage rises.
The filters have to be dimensioned manually or by means of the DSC.

Note!
Relevant for all inverters, in particular for frequency inverters!

Note!
Only relevant for frequency inverters, for servo inverters the use of filters is not permis-
sible!