Siemens Sinamics S120 Manual page 761

Danger to life when live parts are touched
Death or serious injury can result when live parts are touched.
• Only operate the components in electrical equipment rooms or control cabinets that can
Danger to life due to high leakage currents caused by an interrupted external protective
conductor
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.
• Ensure that the external protective conductor satisfies at least one of the following
Functional equipotential bonding
A mounting plate, which is connected with the protective conductor connection of the control
cabinet through a low impedance connection, simultaneously serves as the functional
equipotential bonding surface. This means that no additional functional equipotential bonding
is required within the drive line-up.
If a common bright mounting plate is not available, then equally good functional equipotential
bonding must be established using cable cross-sections as listed in the table above or, as a
minimum, with the same conductivity.
When mounting components on standard mounting rails, the data listed in the table also
apply to the functional equipotential bonding. If only smaller conductor cross-sections are
permissible on components, the largest cross-section must be used (e.g. 6 mm
and SMC). These requirements also apply to distributed components located outside the
control cabinet.
No functional equipotential bonding conductors are required for PROFIBUS inside a control
cabinet. For PROFIBUS connections between different buildings or parts of buildings, a
functional equipotential bonding must be routed in parallel to the PROFIBUS cable.
Booksize Power Units
Manual, (GH2), 04/2014, 6SL3097-4AC00-0BP6
DANGER
be securely locked.
WARNING
conditions:
– It has been laid so that it is protected against mechanical damage.
– If it is a single conductor, it has a cross-section of at least 10 mm² Cu.
– If it is a conductor of a multi-conductor cable, it has a cross-section of at least
2.5 mm² Cu.
– It has a second protective conductor in parallel with the same cross-section.
– It complies with the local regulations for equipment with increased leakage current.
Cables laid within control cabinets or closed machine housings are considered to be
1)
adequately protected against mechanical damage.
1)
Cabinet design and EMC Booksize
12.10 Protective connection and equipotential bonding
1)
for TM31
2
761