Product # 7774
T
ERMINAL
B
OX
The Terminal Box provides easy, reliable connections for splicing wires and
cables. All connections are housed in a weather-resistant enclosure. The terminal box can simplify and speed up the task of wiring the weather station sensors, sensor interface module (SIM), and communication lines.
Note:
The terminal blocks in the Terminal Box are rated for 300V, 10A and are intended for 26-16 AWG
(.08-1.5 mm) wire. When wiring, all applicable building and electrical codes must be followed.
When connecting shielded cables to shielded cables, connect each colored wire
to the same colored wire on the extension cable (or other cable). In twisted-pair
cables, all black wires are ground and may be shorted together.
When connecting standard cables to standard cables, you may also connect
each colored wire to the same colored wire on the extension cable (or other
cable). In some cases, however, wires may be combined in order to use fewer
terminals on the terminal block. Consult the table below:
S
ENSOR
W
IRES IN
STD. C
ABLE
W
IRES
U
SED
N
OTES FOR
S
TANDARD
C
ABLES
Rain Collector 4 2 Twist RED and BLACK as one wire and GREEN and YELLOW as
another wire.
Temp/Hum Sensor 6 5 Twist RED and BLACK as one wire (ground).
Temp Sensor 4 2 Twist RED and BLACK as one wire (ground). Ignore GREEN.
UV/Leaf Wetness Sensor 6 3 Twist RED and BLACK as one wire (ground). Ignore GREEN and
BLUE.
Solar Radiation Sensor 4 3 Twist RED and GREEN as one wire (ground).
Anemometer 4 4
SIM/Junction Box Cable 8 8
Page 2 Terminal Box
C
OMPONENTS
The Terminal Box includes the following components. Please make sure you
have all listed components before continuing.
✦
Terminal Box with Terminal Blocks
✦
Two #8 x Ω ” (19 mm) Self-Threading Screws
T
OOLS
AND
M
ATERIALS
N
EEDED
You may need some of the following tools and materials in order to install the
terminal box.
✦
Medium Slotted Screwdriver
✦
Small Slotted Screwdriver
✦
Drill with #29 (.136”, 3.5 mm) Drill Bit
✦
Center Punch
Mounting the Terminal Box Page 3
M
OUNTING
THE
T
ERMINAL
B
OX
Y ou may mount the Terminal Box against a wall or other vertical surface or you
may simply lay it down on a horizontal surface. The preferred mounting
method is to mount it on a vertical surface in a protected location with the rubber grommet facing down.
Note: You may install the wires through the grommet and into the terminal blocks before or after mounting
the Terminal Box.
1. Hold the Terminal Box against the mounting surface and mark the location of the two
screw holes.
Use a pencil or a center punch to mark the location of the screw holes.
2. Drill pilot holes in the marked locations using a drill with a #29 (.136”, 3.5 mm) drill
bit.
3. Secure the Terminal Box to the mounting surface using the #8 x Ω ” (19 mm) screws
as shown below.
M
OUNTING
THE
T
ERMINAL
B
OX
Page 4 Terminal Box
C
ONNECTING
TO
THE
T
ERMINAL
B
LOCK
Route cables into the box by passing them up through the grommets at the bottom of the box. If routing cable to the top terminal block, you may route cables
either under the metal plate (to which the terminal blocks are attached) or over
the metal plate, as picture below.
R
OUTING
C
ABLES
Connecting to the Terminal Block Page 5
The Terminal Box uses terminal blocks containing high-reliability stainless
steel spring-loaded cage clamps. You will be placing one or two wires into each
individual cage clamp in order to make the connection. If placing two wires
into a single cage clamp, twist the two wires together before inserting. To place
wires into the cage clamp, first strip about 1” (2.5 cm) of the jacket (the outer
covering) and shield (the foil-like inner covering on shielded cables) off the
cable. Then strip about 5/16” (8 mm) of the insulation (the colored outer covering) off each wire in the cable. Finally, use a small screwdriver to push down on
the spring strip next to the terminal, insert the exposed wire into the opening
created on the side of the terminal, and release the spring strip. When you
release the spring strip, the wire(s) will be held in place by the cage clamp.
I
NSERTING
W
IRES
I
NTO
T
ERMINALS
Each terminal block has 12 terminals. The wire inserted into a terminal on one
side of the terminal block connects to the wire inserted into the same terminal
on the other side of the terminal block. (The two related terminal blocks are
referred to as a “position.”) It will probably aid you in keeping track of wire
connections if all of the wires coming into the Terminal Box (from the sensor,
for example) are connected on one side of the terminal block and all of the
wires leaving the Terminal Box (going to the SIM, for example) are connected
on the other side of the terminal block.
C
ONNECTING
W
IRES
TO
THE
S
AME
P
OSITION
Page 6 Terminal Box
Using the Terminal Box to Connect Standard and Shielded SIM Cables
If you wish to use the Terminal Box to splice a shielded 8-conductor cable from
the SIM to the standard 8-conductor cable running to the console, you will
need to determine the wire assignments for the terminal blocks before you
remove the modular connector at the end of the standard cable. To do this, hold
the standard cable, latch lever upward, facing the terminal block, as shown in
the illustration below. The wires in the cable are now in the same sequence as
the terminals. For future reference, write the wire colors into the spaces provided below if they do not match those of the shielded cable.
D
ETERMINING
W
IRE
A
SSIGNMENTS
Connecting to the Terminal Block Page 7
Product Numbers: 7774
Davis Instruments Part Number: 7395-103
Terminal Box
Rev. A Manual (7/8/99)
This product complies with the essential protection requirements of the EC EMC
Directive 89/336/EC.
© Davis Instruments Corp. 1996. All rights reserved.
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