DC link components
7.3 Braking resistors
SINAMICS S120 Combi
Manual, (GH9), 07/2016, 6SL3097-4AV00-0BP5
189
Danger to life if the fundamental safety instructions and remaining risks are not carefully
observed
If the fundamental safety instructions and remaining risks in Chapter 1 (Page 21) are not
observed, accidents involving severe injuries or death may occur.
• Adhere to the fundamental safety instructions.
• When assessing the risk, take into account residual risks.
Fire hazard and device damage as a result of ground fault/short-circuit
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 associated smoke.
• Comply with local installation regulations that enable this fault to be ruled out.
• Protect the cables from mechanical damage.
• In addition, apply one of the following measures:
– Use cables with double insulation.
– Maintain adequate clearance, e.g. using spacers.
– Route the cables in separate cable ducts or pipes.
Risk of burns resulting from high surface temperatures
The braking resistor can become very hot. You can be severely burnt when touching the
surface.
• Mount the braking resistor so that it cannot be touched. If this is not possible, attac
h a
c
learly visible and understandable warning notice at hazardous positions.
• To prevent adjacent components from suffering damage due to these hi
gh
t
emperatures, maintain a clearance of 100 mm on all sides of the braking resistor.
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