Operating instructions

Functions
5.10 Technological functions
CU240S and CU240E Control Units, FW 3.2
Operating Instructions, 03/2009, A5E02440075B AA
129
Different electrical braking methods for different applications
Table 5- 49 Braking methods and Power Modules depending on the application
Application examples Electrical braking method Power Modules that can be
used
Pumps, fans, compressors,
extruders, mixers
Not necessary PM240, PM250, PM260
Fans, grinding machines,
conveyor belts
DC braking, compound braking PM240
Dynamic braking PM240 Centrifuges, vertical conveyors,
hoisting gear, cranes, winders
Regenerative braking PM250, PM260
Braking methods depending on the drive inverter being used
Table 5- 50 Power Modules depending on the braking method
SINAMICS G120 Power Module
PM240 PM250 PM260
DC and compound braking X --- ---
Dynamic braking X --- ---
Regenerative braking --- X X
Advantages and disadvantages of the braking methods
● DC braking
–
Advantage: The motor is braked without the inverter having to convert the braking
energy
–
Disadvantages: significant increase in the motor temperature; no defined braking
characteristics; no constant braking torque; no braking torque at standstill; braking
energy 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 significant amount of braking energy
–
Disadvantages: no constant braking torque; excessive motor temperature rise; braking
energy is dissipated as heat; does not function when the power fails