Siemens SINAMICS G120 CU240B-2 - Page 189

Functions
7.9 Technological functions
Inverter with CU240B-2 and CU240E-2 Control Units
Operating Instructions, 07/2010, FW 4.3.2, A5E02299792B AA
189
Braking with regenerative feedback into the line supply

Advantages: Constant braking torque; the regenerative
power is not converted into heat, but is regenerated into
the line supply; can be used in all applications;
continuous regenerative operation is possible - e.g.
when lowering a crane load

Disadvantage: Does not function when power fails
a a
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The inverter feeds the regenerative power back into the
mains
Braking method depending on the application
Table 7- 24 What braking method is suitable for what application?
Application examples Electrical braking methods Power Modules that can be
used
Pumps, fans, mixers,
compressors, extruders
Not required PM240, PM250, PM260
Grinding machines, conveyor
belts
DC braking, compound braking PM240
Dynamic braking PM240 Centrifuges, vertical conveyors,
hoisting gear, cranes, winders
Braking with regenerative feedback
into the line supply
PM250, PM260
Table 7- 25 What Power Module do you require for a specific braking method?
SINAMICS G120 Power Module
PM240 PM250 PM260
DC braking X X X
Compound braking X --- ---
Dynamic braking X --- ---
Braking with regenerative feedback into the
line supply
--- X X