Electrical Connection - Siemens SINAMICS S120 Equipment Manual

5.2.4

Electrical connection

The Braking Module must only be connected when the Basic Line Module, Smart Line
Module, Active Line Module, or Motor Module has been disconnected from the power
supply and the DC link has been discharged.
CAUTION
The braking resistor cables must be laid in such a way that they are short-circuit and
ground-fault proof.
The length of the connecting cables between the Braking Module and external braking
resistor must not exceed 100 m.
Recommended cable cross-sections:
● For 25/125 kW: 35 mm²
● For 50/250 kW: 50 mm²
Thermostatic switch
A thermostatic switch is installed to protect the braking resistor against overload. Its floating
contacts must be integrated in the fault chain on the line side.
Table 5- 7
Terminal
T1
T2
Max. connectable cross-section: 2.5 mm²
Chassis power units
Manual, (GH3), 10/2008, 6SL3097-2AE00-0BP3
WARNING
Thermostatic switch connection
Function
Thermostatic switch connection
Thermostatic switch connection
DC link components
5.2 Braking resistors
Technical specifications
Voltage: 250 V AC
Load current: max. 1 A
207