Siemens SINAMICS G120 CU240B-2 Operating Instructions Manual page 188

Functions
7.9 Technological functions
Inverter braking methods
Depending on the particular application, there are different methods for dealing with
regenerative energy.
DC braking
Advantage:
The motor is braked without the inverter

having to convert the regenerative energy
Disadvantages:
significant increase in the motor

temperature; no defined braking characteristics; no
constant braking torque; no braking torque at standstill;
braking power is lost as heat; does not function when the
power fails
Compound braking
Advantage:
Defined braking characteristics, the motor is

braked without the inverter having to convert any
regenerative energy
Disadvantages:
significant motor temperature rise; no

constant braking torque; braking power is dissipated as
heat; does not function when the power fails
Dynamic braking
Advantages:
defined braking characteristics; no

additional motor temperature increase; constant braking
torque; in principle, also functions when the power fails
Disadvantages:
A braking resistor is required;

regenerative power is lost as heat; the permissible
thermal load of the braking resistor must be taken into
account
188
The regenerative energy is converted to heat in the motor.
The inverter converts the regenerative power into heat using
a braking resistor
Inverter with CU240B-2 and CU240E-2 Control Units
Operating Instructions, 07/2010, FW 4.3.2, A5E02299792B AA