AEG SB4 series User Manual Page 133

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22
Earthing and EMC-Measures
85
L1, L2, L3 External conductor
PE Protective earth conductor
NN
eutral conductor
PEN PEN conductor
L1
L2
L3
N
PE
Body
L1
L2
L3
PEN
Body
L1
L2
L3
N
Body
Earth for
L1
L2
L3
Body
Impedance
TN S mains
(protective multiple ground with an isolated
TN C mains
(protective multiple ground)
TT mains
(protective earthing and FI safety circuit)
IT main
(protective earth conductor system)
protective earth conductor (PE)
Earth for
protective earth conductor (PE)
PE
protective earth conductor)
Figure 56 Types of Mains
5.1.3 Functional Earthing
The functional earthing serves to specify the electronic equipment of the reference sys-
tem to a noise-free earth potential to discharge noise emissions (EMC) and to improve
the interference suppression.
Protective earthing and functional earthing are carried together and centrally to the
earth ground of the electronic equipment. However, measures for the functional earth-
ing may not remove nor be able to remove the safety measures (even during the start-
up).
5.1.4 Reference Conductor System
The reference conductor system is constructed in an isolated way and is connected to
a defined point of the earth ground (as short a connection as possible, cross-sectional
area of 6 mm
2
).
The following reference potentials are present in the A500:
0V reference potential of the internal electronics
M1 galvanically isolated input circuits, e.g., of the U
B
24 (24 VDC) or >24 VDC supply
M2 supply of the logic section, supply of the analogue modules supply of the analog
modules, supply of the sensors if the inputs are non-isolated
M4 galvanically isolated U
S
24 working voltage
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