Endress+Hauser Proline Promass I 100 - Shielding and Grounding; Connecting the Measuring Device

Proline Promass I 100 Modbus RS485 Electrical connection
Endress+Hauser 29
Modbus RS485, non-hazardous areas and zone 2/Div. 2 (on the device side)
3
2
4
1
5
A0016811
Pin Assignment Coding Plug/socket
1 B Socket
2 A Modbus RS485
3
4 B Modbus RS485
5 Grounding/shielding
7.1.5 Shielding and grounding
The shielding and grounding concept requires compliance with the following:
• Electromagnetic compatibility (EMC)
• Explosion protection
• Personal protection equipment
• National installation regulations and guidelines
• Observe cable specification (  24).
• Keep the stripped and twisted lengths of cable shield to the ground terminal as short as
possible.
• Seamless cable shielding.
Grounding of the cable shield
To comply with EMC requirements:
• Ensure the cable shield is grounded to the potential matching line at multiple points.
• Connect every local ground terminal to the potential matching line.
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.
7.1.6 Preparing the measuring device
1. Remove dummy plug if present.
2. 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.
If measuring device is delivered without cable glands:
Provide suitable cable gland for corresponding connecting cable (  24).
3. If measuring device is delivered with cable glands:
Observe cable specification (  24).
7.2 Connecting the measuring device
NOTICE
Limitation of electrical safety due to incorrect connection!
‣
Have electrical connection work carried out by correspondingly trained specialists only.
‣
Observe applicable federal/national installation codes and regulations.
‣
Comply with local workplace safety regulations.
‣
For use in potentially explosive atmospheres, observe the information in the device-
specific Ex documentation.