Siemens SINAMICS G120 Original Instructions Manual page 281

Connecting a braking resistor
Danger to life due to fire spreading because of an unsuitable or improperly installed braking
resistor
Fire and smoke development can cause severe personal injury or material damage.
Using an unsuitable braking resistor can cause fires and smoke to develop. Possible
consequences are severe personal injury or material damage.
• Only use the braking resistor approved for the inverter.
• Install the braking resistor in accordance with regulations.
• Monitor the temperature of the braking resistor.
Risk of burns due to touching hot surfaces
The temperature of braking resistors increases substantially during operation.
• Do not touch the braking resistor during operation.
Procedure
To connect the braking resistor and monitor the temperature of the braking resistor, proceed
as follows:
1. Connect the braking resistor to terminals R1 and R2 of the inverter.
2. Ground the braking resistor directly to the control cabinet's grounding bar. The braking
3. If you have to fulfill EMC requirements, observe the rules for shielding.
4. Connect the temperature monitoring system of the braking resistor (terminals T1 and T2
Inverter with CU230P-2 Control Units
Operating Instructions, 11/2013, FW V4.6.6, A5E02430659B AG
WARNING
CAUTION
resistor must not be grounded via the PE terminals on the inverter.
on the braking resistor) to a free digital input of your choice on the inverter. Define the
function of this digital input as external fault, e.g. for digital input DI 3: p2106 = 722.3.
Setting functions
8.7 Application-specific functions
281