Siemens SINAMICS G150 Operating Instructions Manual page 144

Electrical installation
4.11 Other connections
Connecting the braking resistor
The cables must only be connected to terminal block -X5 when the cabinet unit is switched
off and the DC link capacitors are discharged.
CAUTION
The cables for the braking resistor must be routed to prevent short-circuiting and ground
faults in accordance with IEC 61800-5-2:2007, Table D.1.
This can be accomplished, for example, by:
• Eliminating the risk of mechanical damage to the cables
• Using cables with double insulation
• Maintaining adequate clearance, using spacers, for example
• Routing the cables in separate cable ducts or tubes
CAUTION
The maximum cable length between the cabinet unit and braking resistor is 100 m.
Table 4- 51
Max. connectable cross-section: 70 mm²
Recommended cable cross-sections:
● For L61 (25 kW): 35 mm²
● For L62 (50 kW): 50 mm²
Connecting the thermostatic switch
Table 4- 52
Max. connectable cross-section (due to CU320-2): 1.5 mm²
142
WARNING
Terminal block -X5 – connection for external braking resistor
Terminal
1 Braking resistor connection
2 Braking resistor connection
Installing the thermostatic switch for the external braking resistor in the monitoring circuit
of the cabinet unit by connecting to the Control Unit (without option G60)
Terminal
T1 Thermostatic switch connection: connection with terminal X132:9 (DO12)
T2 Thermostatic switch connection: connection with terminal X122:5 (DI16)
Description of function
Description of function
Operating Instructions, 03/2012, A5E03263466A
Converter cabinet units