Braking resistors
9.2 Safety instructions for braking resistors
Booksize Power Units
Manual, (GH2), 07/2016, 6SL3097-4AC00-0BP8
551
Safety instructions for braking resistors
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 27) 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.
Risk of fire due to 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.
• Use the local installation regulations to avoid this fault.
• Protect the cables against mechanical damage.
• Also implement one of the following measures:
– Use cables with double insulation.
– Maintain adequate clearance, e.g. by using spacers.
Lay the cables in separate cable ducts or conduits.
Risk of fire through overheating if there are insufficient ventilation clearances
Inadequate ventilation clearances can cause overheating with a risk for personnel due to
smoke and fire.
• Maintain a cooling clearance of 100 mm on all sides of the braking resistor
Risk of burns due to high surface temperatures
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 clearly visible and understandable warning notice at hazardous positions.
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