Rice Lake SURVIVOR 420HE Hostile Environment - Installation Manual - Manual (Page 10)

6 420HE Installation Manual
2.0 Installation
This section describes procedures for connecting load
cells, digital inputs, and serial communications cables
t o t h e
4 2 0 H E i n d i c a t o r. I n s t r u c t i o n s f o r f i e l d
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.
CAUTION
• 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
420HE . 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
420HE to ensure all components are included and
undamaged. The shipping carton should contain the
indicator, 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 87973) 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 2-3).
• Three reducing glands (PN 15664).
• One capacity label (PN 42350).
• Three each of grounding clamps (PN 53075),
external tooth lock washers (PN 15134), and kep
nuts (PN 14626) for cable shield grounding
against the enclosure.
• One capacity label (PN 85552).
• Annunciator labels (PN 85555), replacement
overlay decals for labeling primary and secondary
units LEDs.
• Three reducing glands (PN 15664) used in cord
grips for cable size less that 1/4 in.
2.2 Enclosure Disassembly
The indicator enclosure must be opened to connect
cables for load cells, communications, digital inputs,
and analog output.
Ensure power to the indicator is disconnected, then
place the indicator on an antistatic work mat. Unhook
draw latches, located at the two front corners of the
indicator. See Figure 2-4 9.
2.3 Cable Connections
The 420HE provides four cord grips for cabling into the
i n d i c a t o r : o n e f o r t h e p o w e r c o r d , t h r e e t o
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.
Figure 2-1 shows the recommended assignments for
the
420HE cord grips.
Power Cord Communications Access Load Cell
Cable
Bottom View
Front of Indicator
Figure 2-1. Recommended Cord Grip Assignments