Shielding And Grounding; Preparing The Measuring Device - Endress+Hauser Proline Prosonic Flow I 400 Operating Instructions Manual

Electrical connection
36
Signal transmission Modbus RS485 and additional outputs
Order code for
"Output" and
26 (+)
"Input"
Option M Modbus
B
Option O Current output
4 to 20 mA (active)
7.2.4

Shielding and grounding

Shielding and grounding concept
1. Maintain electromagnetic compatibility (EMC).
2. Take explosion protection into consideration.
3. Pay attention to the protection of persons.
4. Comply with national installation regulations and guidelines.
5. Observe cable specifications .
6. Keep the stripped and twisted lengths of cable shield to the ground terminal as short
as possible.
7. Shield cables fully.
Grounding of the cable shield
NOTICE
In systems without potential matching, the multiple grounding of the cable shield
causes mains frequency equalizing currents!
Damage to the bus cable shield.
‣
Only ground the bus cable shield to either the local ground or the protective ground at
one end.
‣
Insulate the shield that is not connected.
To comply with EMC requirements:
1. Ensure the cable shield is grounded to the potential matching line at multiple points.
2. Connect every local ground terminal to the potential matching line.
7.2.5

Preparing the measuring device

Carry out the steps in the following order:
1. Mount the sensor and transmitter.
2. Sensor connection housing: Connect sensor cable.
3. Transmitter: Connect sensor cable.
4. Transmitter: Connect cable for supply voltage.
NOTICE
Insufficient sealing of the housing!
Operational reliability of the measuring device could be compromised.
‣
Use suitable cable glands corresponding to the degree of protection.
1. Remove dummy plug if present.
2. If the measuring device is supplied without cable glands:
Provide suitable cable gland for corresponding connecting cable.
Proline Prosonic Flow I 400 Modbus RS485
Terminal numbers
27 (-) 24 (+) 25 (-)
-
A
Pulse/frequency/
switch output
(passive)
22 (+) 23 (-) 20 (+)
-
Pulse/frequency/ Modbus
switch output
B
(passive)
Endress+Hauser
21 (-)
-
A