Wiring
34
4.10.2 Potential equalization for the DIN-rail hosuing
If the DIN-rail housing is used, the potential equalization must be connected in the cabinet, e.g. at
a metallic DIN rail:
#
Warning!
The grounding line of the sensors FDU91F/93/95/96 and FDU83/84/85/86 must be connected
to the local potential equalization system after a maximum of 30 m (see section 4.3.1).
L00-FMU90xxx-04-00-00-xx-008
(a): Terminal (isolated from the DIN rail); (b): Protective earth terminal (with contact to the DIN rail); (c): Protective ground
via DIN rail
"
Caution!
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 identiacal to the potential of the sensor electronics.
Pay attention to the potential difference if the sensors are connected to ground!
!
Note!
• The longest required distance has to be taken into account when removing the jacket of the sensor
cable (GNYE in the above example).
• When shortening the sensor cable, comply to the notes in section 4.5, "Shortening the sensor
cable".
4.11 Post-connection check
After wiring the transmitter, carry out the following checks:
• Is the terminal assignment correct?
• For the field housing: Are the cable glands tight and is the cover of the terminal compartment
securely closed?
• If auxiliary energy is switched on: Does a display appear on the display module (if available) and
does the green LED light up?
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
1
Service
Relay
2
1
GNYE
FDU91F/93/95/96
(FDU83/84/85/86)
FMU90
(a)
L
NPEPE
(b)
90 … 253 VAC
10,5 … 32 VDC
(c)
3
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