Siemens SINAMICS S120 Manual page 356
Air-cooled chassis power units
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Also See for SINAMICS S120:
- Function manual (1094 pages) ,
- Diagnostic manual (947 pages) ,
- Manual (848 pages)
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7.2 Braking resistors
Fire due to overheating because of inadequate ventilation clearances
Inadequate ventilation clearances can cause overheating with a risk for personnel through
smoke development and fire. This can also result in increased failures and reduced service
lives of braking resistors.
• It is essential that you maintain a ventilation clearance of 200 mm on all sides of the
Fire and device damage as a result of ground fault/short-circuit
Inadequate installation of the cables to the braking resistor can result in a ground
fault/short-circuit and place persons at risk as a result of the associated smoke and fire.
• 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:
Risk of fire as a result of braking resistor thermal power loss
A braking resistor which is not mounted properly can cause components to overheat with
the associated risk of fire and development of smoke.
• Only mount braking resistors on a baseplate/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.
Burns resulting from high surface temperature of the braking resistor
The braking resistor can become very hot. You can get seriously burnt when touching the
surface.
• Mount the braking resistors so that contact is not possible. If this is not possible, attach a
354
WARNING
component with ventilation grilles.
WARNING
– Use cables with double insulation.
– Maintain adequate clearance, e.g. by using spacers.
– Lay the cables in separate cable ducts or conduits.
WARNING
Sufficient space must be available for dissipating the energy converted by the braking
resistor.
CAUTION
clearly visible and understandable warning notice at hazardous positions.
Air-cooled chassis power units
Equipment Manual, 06/2020, 6SL3097-5AE00-0BP3
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