7
1.3.1
Cable Grounding
Except for the power cord, all cables routed through the
cord grips should be grounded against the CPU
mounting plate. 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 1-2). 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
•
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 1-2. Tighten grounding clamp
nuts.
•
Finish installation using cable mounts and ties to
secure cables inside of indicator enclosure.
Figure 1-2. Grounding Clamp Attachment for Foil-Shielded
and Braided Cabling
Figure 1-3.
420 Plus
CPU and Power Supply Board with Analog Output Option Card
Cord grip
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
C7
RESET
R2
C15
C20
C19
R5
MECCA
C3
+5A V
R1
C13
R16
LED2
GND
GD1
C1
F1
DI
2
DI
1
DFB2
TR1
TVS2
TVS3
TVS6
C33
C31
DO2 DO1
C10
C9
+5V
G2E
R25
C30
VR3
R6
C8
U7
C5
C6
U8
R15
U1
LED1
EDP/
RS-232
JP2
C65
U3
SW1
SETUP
C32
C2
XT1
DFB1
TR2
TVS1
TVS5
TVS4
+3. 3
R7
R4
C16
C4
DIGIN
1
J1
LOAD CELL
U2
D1
U19
U6
U9
SERIAL
1
9
1
1
2
8
1
1
Gn
d
20mA+
Gnd
TxD
Gnd
Gn
d
DI
2
EXC-
19
20
E XC+
SEN-
SEN+
SIG-
1
5
1
1
1
20mA-
RxD
RxD
TxD
DI
1
SIG+
Micr o-
pr ocesso
r
DISPLA
Y
DRIVERS
KEYPAD
CONNECTOR
ANALOG
OUTPUT
OPTION CARD
REMOTE
SETUP
SWITCH
DC INPUT
R9
R10
R11
R12
ANA
ME
M
AD
HB
J9
J10
U4
OFF TEST
A / D C O N V E R T E R
U10
U11
J2
J3
J4
J7
J8
J11
J12
JP1
J1
4
3
2
1
JP2
POS
1
POS
2
JP
1
POS
1
POS
2
DIGOUT
1
+5V
DO2
Gnd
DO1
J6
R46
R47
U14
JMP3
(Factory Only)
ON
OF F
KEYPAD
CONNECTOR
HE_J2
1
2
B1
+
Summary of Contents for Revolution SURVIVOR 420HE
Page 55: ......
Page 56: ...Rice Lake Weighing Systems 07 19 PN 87972 Rev B...
