Siemens SINAMICS G120 Original Instructions Manual page 274

Setting functions
8.7 Application-specific functions
For certain drive applications, the motor can operate in the regenerative mode for longer
periods of time, e.g.:
● Centrifuges
● Hoisting gear and cranes
● Conveyor belts with downward movement of load (vertical or inclined conveyors)
The inverter offers the following options to convert the regenerative power of the motor into
heat or to feed it back into the line: This depends on the Power Module used:
● DC braking (Page 275)
● Compound braking (Page 278)
● Dynamic braking (Page 280)
for Power Modules PM240 and PM330
● Braking with regenerative feedback to the line (Page 283)
A comparison with the main features of the individual braking functions is listed in the
following paragraphs.
Dynamic braking
The inverter converts the regenerative power into
heat using a braking resistor.
Advantages:
•
no additional motor temperature increase;
constant braking torque; in principle, also
functions when the power fails
Disadvantages:
•
regenerative power is dissipated as heat
Braking with regenerative feedback into the line
supply
The inverter feeds the regenerative power back
into the line supply.
Advantages:
•
regenerative power is not converted into heat,
but regenerated into the line supply; can be
used in all applications; continuous
regenerative operation is possible - e.g. when
lowering a suspended load
Disadvantage:
•
fails
274
for Power Modules PM230, PM240, PM250, PM260 and PM330
for Power Module PM240
for Power Modules PM250 and PM260
defined braking characteristics;
braking resistor required;
Constant braking torque; the
Does not function when power
Inverter with CU230P-2 Control Units
Operating Instructions, 11/2013, FW V4.6.6, A5E02430659B AG