Endress+Hauser Prosonic S FMU90 - Page 27

Prosonic S FMU90 Flow Measurement PROFIBUS Wiring
Endress+Hauser 27
3.10.2 Potential equalization for the DIN-rail housing
If the DIN-rail housing is used, the potential equalization must be connected in the cabinet, e.g.
at a metallic DIN rail:
L00-FMU90xxx-04-00-00-xx-008
1 Terminal (isolated from the DIN rail)
2 Protective earth terminal (with contact to the DIN rail)
3 Protective ground via DIN rail
The signal evaluation electronics and its direct connections (display interface, service interface
etc.) are galvanically isolated from the supply voltage and the communication signals. Their
electric potential is identical to the potential of the sensor electronics.
CAUTION
!
Limitation of electrical safety.
‣ Pay attention to the potential difference if the sensors are connected to ground!
‣ Route the protective conductor (GNYE) in such a manner that the protective conductor will
be the last to get strained when the cable is being pulled.
Display
POWER
HART
0/4…20mA
Sync
Fuse
I
1
FDU-
Sensor
RD
11
BK
10
YE
9
40
39
5
4
6
7
8
1
Service
Relay
2
1
GNYE
FDU91F/93/95/96
(FDU83/84/85/86)
1
L
N PE PE
2
90 … 253 VAC
10.5 … 32 VDC
3
3