Electrical connection iTEMP TMT84
16 Endress+Hauser
Shielding and grounding
Optimum electromagnetic compatibility (EMC) of the fieldbus system can only be guaranteed
if the system components and, in particular, the lines are shielded and the shield forms as
complete a cover as possible.
The fieldbus system permits three different types of shielding:
• Shielding at both ends
• Shielding at one end on the feed side with capacitance termination at the field device
• Shielding at one end on the feed side
The best results with regard to EMC are achieved in most cases with one-sided shielding on
the feed side (without capacitance termination at the field device). Operation in the event of
disturbance variables as per NAMUR NE21 is thus guaranteed.
A0042591
8 Shielding and grounding of the fieldbus cable shield at one end
1 Supply unit
2 Junction box (T-box)
3 Bus termination
4 Grounding point for fieldbus cable shield
5 Optional grounding of the field device, isolated from cable shielding
5.3 Post-connection check
Device condition and specifications Notes
Are the device or cables free from damage (visual check)? --
Electrical connection Notes
Does the supply voltage match the information on the nameplate? 9 to 32 V
DC
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