
Functions
7.9 Application-specific functions
Frequency inverters with Control Units CU230P-2 HVAC, CU230P-2 DP, CU230P-2 CAN
Operating Instructions, 01/2011, FW 4.4, A5E02430659B AD
225
7.9.2
Braking functions of the converter
7.9.2.1
Comparison of electrical braking methods
Regenerative power
If an induction motor electrically brakes the connected load and the mechanical power
exceeds the electrical losses, then it operates as a generator. The motor converts
mechanical power into electrical power. Examples of applications, in which regenerative
operation briefly occurs, include:
●
Grinding disk drives
●
Fans
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)
Depending on the Power Modules used, SINAMICS G inverters offer the following options to
either convert the regenerative power of the motor into heat or to feed this power back into
the line supply:
●
for Power Modules PM230, PM240, PM250 and PM260
●
for Power Module PM240
●
for Power Module PM240
●
Braking with regenerative feedback to the line (Page 236)
for Power Modules PM250 and 260
A comparison with the main features of the individual braking functions is listed in the
following paragraphs.
Содержание SINAMICS G120 CU230P-2
Страница 2: ......