Siemens SINAMICS SM120 Operating Instructions Manual page 25

5. Damage from pressure build-up during electric arcs in the event of a fault
6. Dangerous electric arcs during internal faults
Dangerous electric arcs during internal faults
Defects such as damage to components, overvoltages, or loose parts, as well as exceptional
operating statuses, can cause a failure within the enclosure. This can result in an internal
electric arc. If an electric arc occurs and people are nearby, this could lead to death, serious
physical injury, and damage to property.
● Ensure that only qualified personnel perform work on the drive.
● Observe the safety and operating instructions in this documentation and on labels at the
Note
There are no standards for medium-voltage drives stipulating requirements or inspections for
electric arc resistance. There is therefore neither formal guidance provided nor formal
certification available with regard to electric arc resistance.
SINAMICS SM120 6SL38715
Operating Instructions 07/2015
If the building has not been designed correctly for the drive in terms of how it has been
dimensioned, damage can result from the pressure that can possibly build up inside.
The drives are designed according to the relevant IEC standards and have been tested in
line with strict type-testing procedures. They were developed and manufactured so that
there is a very low probability of internal faults occurring. However, internal faults cannot
be completely ruled out.
WARNING
drive for all work on the drive.
Safety instructions
2.7 Residual risks
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