Endress+Hauser PROline 93 II2G Serie Bedienungsanleitung Seite 57

PROline Prosonic Flow 93 FOUNDATION Fieldbus
Endress+Hauser
Potential equalisation with shielding grounded at both ends
3
R
C
Fig. 8: Examples of the connection of potential equalisation lines
1 = distributor/T-box
2 = Prosonic Flow 93 bus devices for hazardous area
3 = bus termination: R = 90...100 Ω , C = 0...2.2 µ F
4 = fieldbus power supply variant 4a
4a = shielding connected via capacitor
5 = fieldbus power supply variant 5a
5a = potential equalisation line led out
Variant 4/4a:
With capacitive grounding of the shielding in the safe area the potential equalisation line
does not need to be led out of the safe area.
Use small capacitors (e.g. 1 nF, 1500 V, dielectric strength, ceramic). The total capaci-
tance connected at the shielding must not exceed 10 nF.
Variant 5/5a:
Potential equalisation line is led out of the safe area.
1 1
r
Esc
- + E
2


E X E X
4a
r
Esc
- +
E
2
5a
4
5
19