Siemens SINAMICS V20 Operating Instructions Manual page 95

Motor overheat
For DC current braking, the motor kinetic energy is converted into thermal energy in the
motor. If braking lasts too long, then the motor can overheat.
Note
The "DC braking" function is only practical for induction motors.
DC braking is not suitable to hold suspended loads.
While DC braking, there is no other way of influencing the inverter speed using an external
control. When parameterizing and setting the inverter system, it should be tested using real
loads as far as possible.
Compound braking
For compound braking (enabled using P1236), DC braking is superimposed with
regenerative braking (where the inverter regenerates into the DC-link supply as it brakes
along a ramp). Effective braking is obtained without having to use additional components by
optimizing the ramp-down time (P1121 for OFF1 or when braking from f1 to f2, P1135 for
OFF3) and using compound braking P1236.
SINAMICS V20 Inverter
Operating Instructions, 11/2016, A5E34559884-006
WARNING
Commissioning via the built-in BOP
5.6 Function commissioning
95