Siemens CU240B-2 - Braking with Regenerative Feedback to the Line

Advanced commissioning
6.7 Application-specific functions
Converter with the CU240B-2 and CU240E-2 Control Units
292 Operating Instructions, 01/2016, FW V4.7 SP6, A5E34259001B AC
6.7.3.4
Braking with regenerative feedback to the line
The typical applications for braking with energy recovery (regenerative feedback into the line
supply) are as follows:
● Hoist drives
● Centrifuges
● Unwinders
For these applications, the motor must brake for longer periods of time.
The inverter can feed back up to 100% of its rated power into the line supply (referred to
"High Overload" base load).
Technical data, PM250 (Page 469)
Setting the braking with regenerative feedback to the line
Parameter
Description
Limiting the regenerative feedback for V/f control (p1300 < 20)
p0640
Motor series overload factor
(factory setting: 0.00 A, default for quick commissioning)
It is only possible to limit the regenerative power with V/f control by limiting the motor
current.
If the current exceeds this value for longer than 10 s, the inverter shuts down the motor
with fault F07806.
Limiting feedback with vector control (p1300 ≥ 20)
p1531
Power limit generative
(factory setting: -0.01 kW)
The inverter calculates the parameter based on the quick commissioning or with p0340
= 5.