Lenze DSD - Manual (Page 398)

15 Results: comparing, optimising, logging
15.6 Reserves with regard to the drive dimensioning
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Lenze · Drive Solution Designer · Manual · DMS 4.2 EN · 12/2013 · TD23
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15.6.6 Reserves for brake resistors and brake choppers
Brake resistors are non-critical components, so that they don't immediately fail or are switched off
if the rated power is exceeded.
• If the rated power of the resistor is exceeded continuously, the temperature monitoring of the
resistor can be activated and switch off the system.
The brake choppers do not feature a current monitoring.
• The maximum permissible current can be exceeded by an incorrect assignment of the brake re-
sistor, which, however, is checked by the DSD.
• The continuous load limit of the brake chopper is also checked by the DSD.

Danger!
Without a temperature monitoring on the resistor, the surface temperature can reach
impermissible values and possibly present an ignition source for combustible materials
close-by!

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).
The reserves for brake resistors/brake choppers should be at least 15 ... 25 %.