Connecting the PSSu system
Installation Manual PSSuniversal
21262-EN-07
46
Example 4: Module supply and periphery supply from a common power supply, floating
supply group.
Module Supply
Periphery Supply
Periphery Supply
Module Supply
Module SUpply
C-rail
Earth rail
Moun!ng rail
Module Supply
Periphery Supply
Func!onal earth
Control cabinet
Earth fault monitoring
in accordance with
EN 60204 / VDE 0113
is required
Fieldbus
Periphery:
- Sensors
- Actuators
PSSuniversal
6.3
Earthing
When modules are attached to the mounting rail, a contact spring makes the electrical con-
tact between the modules' functional earth and the mounting rail.
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Always connect the mounting rail to the protective earth via an earthing terminal. This
will be used to dissipate hazardous voltages in the case of a fault.
The earthing terminal is available as an accessory. The mounting rail must be properly
earthed to ensure interference-free operation in accordance with EMC regulations.
The supplies on the PSSuniversal module bus (module supply, periphery supply, C-rail) are
not connected to the functional earth through the contact spring.
On analogue modules and counter modules with base modules without a C-rail, the contact
spring also connects the shielding connections to the mounting rail.
Earthing the mounting rail:
