Siemens SINAMICS G120 Operating Instructions Manual page 190

Functions
7.9 Application-specific functions
Main features of the braking functions
DC braking
The motor converts the regenerative power into
heat.
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•
Compound braking
The motor converts the regenerative power into
heat.
•
•
Dynamic braking
The inverter converts the regenerative
power into heat using a braking resistor.
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•
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Advantage:
The motor brakes without the
inverter having to process the regenerative
energy
Disadvantages:
significant increase in the
motor temperature; no defined braking
characteristics; no constant braking torque; no
braking torque at standstill; regenerative
power is lost as heat; does not function when
the line supply fails
Advantage:
Defined braking characteristics,
the motor brakes without the inverter having to
convert any regenerative energy
Disadvantages:
significant motor temperature
rise; no constant braking torque; regenerative
power is dissipated as heat; does not function
when the line supply fails
Advantages:
defined braking
characteristics; no additional motor
temperature increase; constant
braking torque; in principle, also
functions when the power fails
Disadvantages:
Braking resistor
required; regenerative power is
dissipated as heat
Inverter with CU240B-2 and CU240E-2 Control Units
Operating Instructions, 01/2011, FW 4.4, A5E02299792B AB