Proline Promass E 100 Modbus RS485 Electrical connection
Endress+Hauser 29
7.2.5 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.
7.2.6 Preparing the measuring device
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.
3. If the measuring device is supplied with cable glands:
Observe requirements for connecting cables → 24.
7.3 Connecting the measuring device
NOTICE
Limitation of electrical safety due to incorrect connection!
‣
Have electrical connection work carried out by appropriately trained specialists only.
‣
Observe applicable federal/national installation codes and regulations.
‣
Comply with local workplace safety regulations.
‣
Always connect the protective ground cable before connecting additional cables.
‣
For use in potentially explosive atmospheres, observe the information in the device-
specific Ex documentation.
‣
The power unit must be tested to ensure it meets safety requirements (e.g. PELV,
SELV).
To Next Page
Loading...
