Siemens SINAMICS G120 Operating Instructions Manual page 275

Connecting a braking resistor
Injuries from smoke gases when using an unsuitable braking resistor
An unsuitable braking resistor may result in a fire during operation. The following risks exist
as a result:
• Smoke gas development
• Expansion of the fire due to open flames
Remedy:
• Only use the specified braking resistors.
• Maintain an appropriate distance from the other components around the braking
• Ensure adequate ventilation.
Procedure
To connect a braking resistor to the inverter, proceed as follows:
1. Connect the braking resistor to terminals R1 and R2 of the Power Module
2. Ground the braking resistor directly to the control cabinet's grounding bar. It is not
3. If you must observe the EMC guidelines, pay special attention to the shielding.
4. Evaluate the braking resistor's temperature monitoring (terminals T1 and T2) such that
Converter with the CU250S-2 Control Unit (vector)
Operating Instructions, 06/2013, FW V4.6, A5E31759476B AB
WARNING
resistor.
permissible that the braking resistor is grounded via the PE terminals on the Power
Module.
the inverter outputs a fault when the resistor has an overtemperature condition.
You can do this in the following two ways:
– Use a contactor to disconnect the inverter 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 inverter.
Setting functions
8.7 Application-specific functions
275