Lenze DSD - Manual (Page 397)

Lenze · Drive Solution Designer · Manual · DMS 4.2 EN · 12/2013 · TD23
397
15 Results: comparing, optimising, logging
15.6 Reserves with regard to the drive dimensioning
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15.6.3 Speed reserves
If unlimited performance of the application is also required in the case of undervoltages, voltage
drops due to long motor cables, or filters, corresponding speed reserves must be considered in the
drive dimensioning.
15.6.4 Torque reserves of the motor
Dynamic torque reserves can only be accurately planned by using the M-n characteristics of the mo-
tor.
• In the selection table of the motor the requirement of the application is represented in the M-n
characteristic.  Selection table ( 319)
15.6.5 Reserves for inverters, power supply modules, regenerative power supply modules
These are reserves for the maximum current I
max
and the thermal utilisation "ixt" of the inverter.
• The I
max
reserves should at least be 15 ... 25 %, so that the drive can always be controlled in a
safe manner.
• The ixt reserves should at least be 15 ... 25 %, so that the drive works reliably and does not
switch off.

Note!
Note that the dimensioning of this drive component defines the braking ability of the
drive train and should not be dimensioned too tightly.
With regard to the determined DC power, the DSD already allows for 10 % of reserves,
and also represents it as a requirement (incl. reserves).