Siemens SINAMICS G120 Operating Instructions Manual page 276

Setting functions
8.7 Application-specific functions
You have connected the braking resistor to the inverter.
You will find more information about the braking resistor in the installation instructions for
Power Module PM240
(http://support.automation.siemens.com/WW/view/en/30563173/133300).
Procedure: Set dynamic braking
In order to optimally utilize the connected braking resistor, you must know the braking power
that occurs in your particular application.
Table 8- 29
Parameter
p0219
p0844
276
Define the function of this digital input as external fault, e.g. for a digital input DI 3:
p2106 = 722.3.
Figure 8-25 Braking resistor connection (as example: Temperature monitoring via digital input
DI 3)
Parameter
Description
Braking power of the braking resistor (factory setting: 0 kW)
Set the maximum braking power that the braking resistor must handle in your particular
application.
Under certain circumstances, for low braking power ratings, the inverter extends the
ramp-down time of the motor.
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 power rating of 1 kW × 2 s / 10 s = 0.2 kW and set the maximum
braking power to: p0219 = 1 (kW).
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.
Operating Instructions, 06/2013, FW V4.6, A5E31759476B AB
Converter with the CU250S-2 Control Unit (vector)