Braking With Regenerative Feedback To The Line - Siemens SINAMICS G120 Operating Instructions Manual

Set dynamic braking
Parameter
p0219
p0844
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, see section Technical data, Power Modules (Page 372)).
Setting the braking with regenerative feedback to the line
Parameter
Limiting the regenerative feedback for U/f control (p1300 < 20)
p0640
Limiting feedback with vector control (p1300 ≥ 20)
p1531
Converter with CU230P-2 Control Units
Operating Instructions, 04/2015, FW V4.7 SP3, A5E34257946B AB
Description
Braking power of the braking resistor (factory setting: 0 kW)
Set the braking power of the braking resistor.
Example: In your particular application, the motor brakes every 10 seconds. In so doing,
the braking resistor must handle a braking power of 1 kW for 2 s. Use a braking resistor
with a continuous rating of 1 kW × 2 s / 10 s = 0.2 kW, and set the maximum braking
power to: p0219 = 1 (kW).
Under certain circumstances, for low braking power ratings, the inverter extends the
ramp-down time of the motor.
For p0219 > 0, the inverter deactivates the VDC_max controller.
No coast down/coast down (OFF2) signal source 1
p0844 = 722.x Monitor the overtemperature of the braking resistor with digital input x
of the inverter.
Description
Motor series overload factor (factory setting: 0.00 A, default for basic 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.
Power limit, generating (factory setting: -0.01 kW)
The inverter calculates the parameter based on the basic commissioning or with p0340
= 5.
Advanced commissioning
6.7 Application-specific functions
255