Siemens SINAMICS S120 Equipment Manual page 186

DC link components
6.2 Chassis
Fire due to overheating resulting from excessively long connecting cables
Excessively long connection cables between the Braking Module and the external braking
resistor may cause components to overheat with the associated risk of fire and smoke.
• The length of the connection cables between the Braking Module and the external
Fire as a result of thermal power loss from the braking resistor
An incorrectly installed braking resistor can cause overheating of components with resulting
fire and smoke.
• Only mount braking resistors on the floor.
• Mount the braking resistors so that they are in the vertical position and freestanding.
• Maintain sufficient clearance to objects that can burn.
• Do not place any objects on or above the braking resistor.
NOTICE
Damage to braking resistor due to ingress of water
The ingress of water can damage the braking resistor.
• To maintain degree of protection IP20, provide a canopy to protect against rain when
Note
Interaction between braking resistor and fire detection sensor
If a braking resistor is placed underneath a fire detection sensor, the heat generated could
trigger the fire detection sensor.
184
WARNING
braking resistor must not exceed 100 m.
WARNING
Sufficient space must be available for dissipating the energy converted by the braking
resistor.
mounting outside.
Manual, 06/2019, 6SL3097-5AL00-0BP1
AC Drive