920i Installation manual - Rice Lake Weighing Systems

grounding clamps to determine cable lengths
required to reach cable connectors. Mark
cables to remove insulation and shield as
described below:
• For cables with foil shielding, strip insulation
and foil from the cable half an inch (15 mm)
past the grounding clamp (see Figure 2-2).
Fold the foil shield back on the cable where
the cable passes through the clamp. Ensure
silver (conductive) side of foil is turned
outward for contact with the grounding
clamp.
• For cables with braided shielding, strip cable
insulation and braided shield from a point just
past the grounding clamp. Strip another half
inch (15 mm) of insulation only to expose the
braid where the cable passes through the
clamp (see Figure 2-2).
2.3.3 Load Cells
To attach cable from a load cell or junction box to an
installed A/D card, route the cable through the cord
grip and ground the shield wire as described in
Section 2.3.2 on page 10.
Next, remove connector J1 from the A/D card. The
connector plugs into a header on the A/D card (see
Figure 2-3). Wire the load cell cable from the load cell
or junction box to connector J1 as shown in Table 2-1.
Cord grip
NOTE: Install lockwashers
first, against enclosure,
under grounding clamp
Insulated cable
Braid
Cut insulation here
for braided cables
J1
Foil (silver side out)
Grounding clamp
SIG+
SIG–
SEN+
SEN–
EXC+
EXC–
JP1 JP2
Shield wire (cut)
Cut insulation here
for foil-shielded cables
Figure 2-3. Single-Channel A/D Card
Length of foil before folding
back on cable insulation
Figure 2-2. Grounding Clamp Attachment for Foil-Shielded
and Braided Cabling
• For load cell cables, cut the shield wire just
past the grounding clamp. Shield wire
function is provided by contact between the
cable shield and the grounding clamp.
• Route stripped cables through cord grips and
clamps. Ensure shields contact grounding
clamps as shown in Figure 2-2. Tighten
grounding clamp nuts.
• Finish installation using cable ties to secure
cables inside of indicator enclosure.
If using 6-wire load cell cable (with sense wires),
remove jumpers JP1 and JP2 before reinstalling
connector J1. For 4-wire installation, leave jumpers
JP1 and JP2 on. For 6-wire load cell connections on
dual-channel A/D cards, remove jumpers JP3 and JP4
for connections to J2.
When connections are complete, reinstall load cell
connector on the A/D card and use two cable ties to
secure the load cell cable to the inside of the
enclosure.
A/D Card
Connector Pin
Function
1 +SIG
2 –SIG
3 +SENSE
4 –SENSE
5 +EXC
6 –EXC
• For 6-wire load cell connections to connector J1, remove
jumpers JP1 and JP2.
• For 6-wire load cell connections to connector J2 (dual A/D
cards), remove jumpers JP3 and JP4.
Table 2-1. A/D Card Pin Assignments
Installation 11