Siemens SIMATIC S7-1500 System Manual page 89

Connecting
6.9 Protective conductor and potential equalization, functional ground
Potential equalization
If there is no common bare metal mounting plate, you need different potential equalization
that comes as close as possible to a cross-section in accordance with the "Cable cross-
section for copper protective conductors" table, or at least with the same conductance.
①
②
③
④
⑤
⑥
⑦
⑧
⑨
⑩
⑪
⑫
Note
The ground potential and enclosure (PE) for the SIMATIC Drive Controller are connected
over a low-impedance internal connection.
Electric shock without grounding
If there is no protective conductor connection or the connection is incorrectly implemented
for devices with protection class I, high voltages can be present at open, exposed parts,
which can result in death or serious injury if the parts are touched.
• Ground the device in compliance with the applicable regulations.
88
SIMATIC Drive Controller
SINAMICS S120 Line Module
SINAMICS S120 Double Motor Module
SINAMICS S120 Single Motor Module
SINAMICS Sensor Module Cabinet-Mounted (SMC)
SINAMICS Terminal Module (TM)
Power supply, for example, SITOP
HMI device
Control cabinet
Functional ground bar
Flexible protective conductor
Control cabinet door
WARNING
SIMATIC Drive Controller
System Manual, 11/2019, A5E46600094-AA