Ferrites And Option Board Cabling - Mettler Toledo IND780 Guide D'installation

IND780 Terminal Division 2 and Zone 2/22 Installation Manual
Figure 2-14: Wallboard or Drywall Installation
Periodically inspect the terminal to insure that it is securely anchored to the wall. If
not, remove the terminal and retighten the mounting anchor bolts.

Ferrites and Option Board Cabling

Ferrites
In order to meet certain electrical noise emission limits and to protect the IND780
from external influences, it is necessary to install a ferrite core on each cable
connected to the terminal. Two types of ferrites are supplied with the basic
terminal, and additional ferrites may be supplied with each of the options.
• The large clamp ferrites can be attached to larger cables such as Ethernet, USB
and some PLC cables.
• The large core ferrite is used with the panel mount power cable.
• The small clamp ferrite is to be used on the ground wire of the POWERCELL
board. In this case, no wrap is required.
To install the large core ferrite on the panel mount power cord, remove the
insulation and shielding from the end of the cable. Before attaching the power
connector, route the blue and brown wires through the center of the core and take
two wraps around the outside of the core, each time routing the cables through
again. Note that he striped green and yellow ground wire does not pass through
the core.
Figure 2-15: Ferrite Core on Panel Mount Power Cord
When using a clamp type ferrite, a loop can be made in the cable and the ferrite
snapped over the spot where the cable overlaps itself. Either the complete cable or
individual wires can be wrapped through the ferrite.
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