Rice Lake 420 Plus, Руководство по установке

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420 Plus Installation Manual - Installation 5
2.0 Installation
This section describes procedures for connecting load
cells, digital inputs, and serial communications cables
to the
420 Plus indicator. Instructions for field
i n s t a l l a t i o n o f t h e a n a l o g o u t p u t o p t i o n a n d
replacement of the CPU board are included, along
with assembly drawings and parts lists for the service
technician.
• Use a wrist strap to ground yourself and protect
components from electrostatic discharge (ESD)
when working inside the indicator enclosure.
• This unit uses line fusing which could create an
electric shock hazard. Procedures requiring
work inside the indicator must be performed by
qualified service personnel only.
• The supply cord serves as the main power
disconnect for the
420 Plus
. The power outlet
supplying the indicator must be installed near
the unit and be easily accessible
2.1 Unpacking and Assembly
Immediately after unpacking, visually inspect the 420
Plus to ensure all components are included and
undamaged. The shipping carton should contain the
indicator with attached tilt stand, this manual, and a
parts kit. If any parts were damaged in shipment,
notify Rice Lake Weighing Systems and the shipper
immediately.
The parts kit (PN 85219) contains the items listed
below:
• Two, six-position screw terminals (PN 70599)
for connectors J4 & J1, two, three-position
screw terminals (PN 71125) for connectors J2
and J3, and one, four-position screw terminal
(PN 71126) for connector J6 (see figure 2-4).
• Two 8-32NC x 7/16 fillister head screws (PN
30623).
• Four 8-32NC x 3/8 machine screws (PN
14862) for the indicator backplate (see #1 in
Figure 2-8 12).
• Six neoprene washers (PN 45042) for
backplate screws included in the parts kit.
• Four rubber bumpers (“feet”) for the tilt stand,
(PN 42149).
• Three reducing glands (PN 15664).
• One capacity label (PN 42350).
• Three each of grounding clamps (PN 53075),
external tooth lock washers (PN 15133), and
k e p n u t s ( P N 1 4 6 2 6 ) f o r c a b l e s h i e l d
grounding against the enclosure.

• One SEC C (section cap) and CLC
(Concentrated Load) (PN 85552) label.
• Annunciator labels (PN 85555), replacement
overlay decals for labeling primary and
secondary units LEDs.
2.2 Enclosure Disassembly
The indicator enclosure must be opened to connect
cables for load cells, communications, digital inputs,
and analog output.
The
420 Plus
has an on/off switch for
the load cells and processor functions.
Before opening the unit, ensure the
power cord is disconnected from the
power outlet. The power outlet must be located near the
indicator to allow the operator to easily disconnect power
to the unit.
Ensure power to the indicator is disconnected, then
place the indicator face-down on an antistatic work
mat. Remove the screws that hold the backplate to the
enclosure body, then lift the backplate away from the
enclosure and set it aside.
2.3 Cable Connections
The 420 Plus provides four cord grips for cabling into
the indicator: one for the power cord, three to
accommodate load cell, communications, digital
inputs, and analog output cables. Two of the three free
cord grips come with a plug installed to prevent
moisture from entering the enclosure. Depending on
your application, remove the plug from any cord grip
that will be used and install cables as required.
The unit will keep the date and time as long
as it is plugged in, Even if display and load
cells are turned off. When the unit is
unplugged, it will lose date and time
information.
Figure 2-1 shows the recommended assignments for
the
420 Plus cord grips.
Figure 2-1. Recommended Cord Grip Assignments
Caution
Warning
Note
Setup Switch
Access Screw
Communications Access
Cord Grip (Plugged)
Power Cord
Front of
Indicator
Backplate
Bottom View
Load Cell Cable
Cord Grip (Open)