Siemens SINAMICS G120 Operating Instructions Manual page 279

● After OFF1 or OFF3 (the DC brake is released via P1233) ‒ Sequence 1
● Directly selected using BICO parameter P1230 ‒ Sequence 2
For DC braking, a DC current is impressed in the stator winding which results in a significant
braking torque for an induction motor. The magnitude, duration and frequency at which
braking starts can be set for the braking current and therefore braking torque by setting the
appropriate parameters. The DC brake can therefore support a braking operation from
approx. < 10 Hz or prevents / minimizes the increase in the DC link voltage for regenerative
braking. This is realized because energy is directly absorbed in the motor. The essential
advantage and the main application of the DC brake is the fact that a holding torque can be
generated at standstill (0 Hz). For instance, this is important forapplications where after
positioning, any motion in the mechanical system / product itself can result in waste.
DC braking is especially used for:
● Centrifuges
● Saws
● Grinding machines
● Conveyor belts
Control Units CU240S
Operating Instructions, 11/2006, A5E00766042B AA
Functions
8.15 Brake functions
8-83