Protective Connection And Equipotential Bonding - Siemens SINAMICS S120 Manual

6.10

Protective connection and equipotential bonding

Protective connections
The SINAMICS S Booksize drive system is designed for use in cabinets with a PE conductor
connection.
The protective conductor connection of the SINAMICS components must be connected to
the protective conductor connection of the control cabinet as follows:
Table 6- 12
Line supply cable in mm
Up to 16 mm
From 16 mm
From 35 mm
The values listed in this table are applicable if the protective conductor is manufactured out
of the same metal as the line conductors. If this is not the case, then the protective conductor
cross-section must be determined so that a level of conductivity is obtained that is as a
minimum, the same as the data listed in this table.
All system components and machine parts must be incorporated in the protection concept.
The protective connection for the motors used must be established through the motor cable.
Copper cables with the appropriate cross-section (> 2.5 mm
connection of PROFIBUS participants.
Further information about ground connection for PROFIBUS can be found at:
http://www.profibus.com/fileadmin/media/wbt/WBT_Assembly_V10_Dec06/index.html
Electric shock caused by high leakage currents when the protective conductor in the line
feeder cable is interrupted
The drive components conduct a high leakage current via the protective conductor.
Touching conductive parts when the protective conductor is interrupted can result in death
or serious injury.
• Carefully comply with the applicable regulations for dimensioning the protective
Protective connection concept, SINAMICS S120 booksize power units
Booksize power units should always be connected with a protective conductor to the central
PE busbar or the conductive mounting plate in the control cabinet (see the following
diagram).
Note
Ensure that for increased leakage currents, the local regulations for protective conductors at
the installation site are complied with.
Power Units in Booksize C/D-Type Format
Manual, 12/2018, 6SL3097-5AC20-0BP0
Conductor cross-section for copper protective connections
2
2
to 35 mm
2 2
2
WARNING
conductor (see below).
6.10 Protective connection and equipotential bonding
Copper protective connection in mm
The same as the line supply cable
16 mm
2
0.5 x line supply cable
) must be used for the ground
2
Cabinet design
2
125