Siemens SINAMICS G120 Operating Instructions Manual page 198

Functions
7.9 Application-specific functions
● Evaluate the braking resistor's temperature monitoring (terminals T1 and T2) such that
Figure 7-14
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).
If an unsuitable braking resistor is used, this could result in a fire and severely damage the
converter.
The temperature of braking resistors increases during operation. For this reason, avoid
coming into direct contact with braking resistors. Maintain sufficient clearances around the
braking resistor and ensure that there is adequate ventilation.
Parameterizing the dynamic braking
Deactivate the V
maximum DC link voltage (Page 179).
The dynamic braking does not have to be parameterized any further.
196
the motor is switched off when the resistor experiences overtemperature.
You can do this in the following two ways:
– Use a contactor to disconnect the converter from the line as soon as the temperature
monitoring responds.
– Connect the contact of the temperature monitoring function of the braking resistor with
a free digital input of your choice on the converter. Set the function of this digital input
to the OFF2 command.
Braking resistor connection (example: Temperature monitoring via DI 3)
WARNING
controller. The V
DCmax
controller is described in Section Limiting the
DCmax
Inverter with CU240B-2 and CU240E-2 Control Units
Operating Instructions, 01/2011, FW 4.4, A5E02299792B AB