Flowserve MX FOUNDATION Fieldbus Field Unit - Manual (Page 18)

MX/QX FOUNdaTION Fieldbus Field Unit FCd LMENIM2330-01 – 08/11
18
NOTE:
• Shielded twisted-pair cables are used.
• Shields are connected to earth ground at only one point in the segment to avoid ground loops.
• Clean earth-ground connection (less than 5 ohms) provides noise protection and a clear, safe
path for surge currents.
Prepare the network cable for connection to the MX/QX terminals a follows:
a CAUTION: Strip stranded conductors carefully; do not damage the strands. This will weaken
the conductor. Do not nick conductors when stripping away the insulation. Nicking stresses the
conductor and can cause the conductor to break. This type of damage may not be apparent and
failure can occur later without warning.
1. Remove two to three inches (5 to 8 cm) of the outer plastic jacket as shown in Figure 2.9. Do not
cut or nick the drain wire or the insulated conductors.
Figure 2.9 – Removing Outer Plastic Jacket
NOTE: Excess cable should be cut, not coiled or looped, to prevent noise induction into the network.
2. Separate the cable parts. Unbraid the shield and peel back the foil shield to the same point where
the outer jacket was removed as shown in Figure 2.10.
Figure 2.10 – Seperating Cable Parts