Endress+Hauser prowirl 77, Руководство по эксплуатации

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4 Electrical Connection
4.1 Connecting the Transmitter
Caution!
•
All relevant national installation regulations must be observed.
•
When installing an Ex version transmitter, please read the separate
Ex documentation supplied.
Procedure
1. Unscrew the front cover.
2. Loosen the two Phillips screws on the upper cover plate and let it swing down.
3. Feed the power and signal cables through the cable gland.
4. Wire up according to the wiring diagram shown on this page.
5. Replace the cover plate and secure.
6. Screw the front cover securely again to the transmitter housing.
4.2 Wiring Diagram
Connect cable according to wiring diagram.
•
Connect cable cores to clamp 1 and 2. An exchange of the polarity has no
influence on operation.
•
Connect cable shielding to the internal grounding.
•
The external ground terminal must be connected to the potential equalization grid.
The grounding design of the plant is to be observed.
The bus cable should always be screened at both ends.
Caution!
1 2 3
+
-
PROFIBUS-DP
Segment coupler
ba
037y
1
6
PROFIBUS-PA
Cable screen
Potential equalization
31.25 kbit/s
PA+ PA–
Fig.11
Connection of PROFIBUS-PA
devices to a PROFIBUS-DP
network
Prowirl 77 PROFIBUS-PA 4 Electrical Connection
Hauser 15