Protective Connection And Equipotential Bonding - Siemens SINAMICS S120 Manual

Cabinet design and EMC for components, Blocksize format

10.7 Protective connection and equipotential bonding

10.7 Protective connection and equipotential bonding
Protective connections
The SINAMICS S drive system is designed for use in cabinets with a protective 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 10- 18 Conductor cross-section for copper protective connections
Line supply cable in mm
Up to 16 mm
From 16 ... 35 mm
From 35 mm
For materials other than copper, the cross-section should be increased so that as a
minimum, the same conductivity is attained.
All system components and machine parts must be incorporated in the protection concept.
The protective connection (PE connection) of the motors used must be established through
the motor cable.
Danger to life 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
Protection connection concept for SINAMICS blocksize
Power Modules blocksize 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.
372
2
2
2)
2
WARNING
conductor (see below).
Copper protective connection in mm
The same as the line supply cable
16 mm
2
0.5 x line supply cable
Manual, (GH6), 07/2016, 6SL3097-4AL00-0BP5
2
AC Drive