Rice Lake 420 Plus HMI Digital Weight Indicator Installation Manual - Manual (Page 11)

420 Plus Installation Manual - Installation 7
2.3.1 Cable Grounding
Except for the power cord, all cables routed through the
cord grips should be grounded against the indicator
enclosure. Do the following to ground shielded cables:
• Use the lockwashers, clamps, and kep nuts
provided in the parts kit to install grounding
clamps on the enclosure studs adjacent to cord
grips. Install grounding clamps only for cord
grips that will be used; do not tighten nuts.
• Route cables through cord grips and 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).
• 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 mounts and ties
to secure cables inside of indicator enclosure.
Insulated cable
Foil (silver side out) Grounding clamp
Shield wir e (cut)
Length of foil before folding
back on cable insulation
Cut insulation here
for foil-shielded cables
Braid
Cut insulation here
for braided cables
NOTE: Install lockwashers
first, against backplate,
under grounding clamp
Figure 2-2. Grounding Clamp Attachment for Foil-Shielded
and Braided Cabling
2.3.2 Bypass Power Button
If jumper JMP1 is set for SW position, the power
switch on the front panel of the indicator will turn the
unit ON or OFF. If it is not in the SW position, the
indicator will power up as soon as the AC is applied.
This allows the front panel overlay power control
switch to be bypassed. Label “F” in Figure 2-3 shows
the location of JMP1. Figure 2-4 on page 8 shows
entire board.
Figure 2-3. 420 Plus CPU and Power Supply Board JMP1
Shunt Location