Electrical Connection - Siemens SINAMICS S120 Manual

5.2.4

Electrical connection

Connect only when the device is switched off
The Braking Module must only be connected when the Line Module or Motor Module has
been disconnected from the power supply and the DC-link capacitors have been
discharged.
Risk of fire and damage to equipment due to short-circuit / ground fault
The cables to the braking resistor must be routed so that a ground fault or short-circuit can
be ruled out. A ground fault can result in fire with smoke.
• Protect the cables from mechanical damage.
• Comply with local installation regulations that enable this fault to be ruled out.
In addition, apply one of the following measures:
• Use cables with double insulation.
• Maintain adequate clearance, using spacers, for example.
• Route the cables in separate cable ducts or pipes.
NOTICE
Maximum cable lengths
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), 01/2013, 6SL3097-4AE00-0BP3
WARNING
WARNING
Thermostatic switch connection
Function
Thermostatic switch connection
Thermostatic switch connection
DC link components
5.2 Braking resistors
Technical specifications
Voltage: 250 VAC
Load current: Max. 1 A
245