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PDF JB1010 Data sheet ( Hoja de datos )
| Número de pieza | JB1010 | |
| Descripción | Ten-Channel Junction Box | |
| Fabricantes | Rice Lake | |
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JB1010
Ten-Channel Junction Box
Installation
Manual
To be the best by every measure
36329
Free Datasheet http://www.datasheet4u.com/
1 page  
2.0 Mounting the Enclosure
The JB1010 has 4.0" x 8.75" mount-
ing centers for #10 or 1/4" screws.
Mount the enclosure for proper
service access. Avoid mounting on
weighbridges where vibration and
shock loads may loosen connections
and locations prone to flooding.
8.750"
Mounting
The standard JB1010 has water-
proof nylon cord grips to seal the
cables and provide strain relief.
7.875"
4.000" Mounting
Cable diameters from 0.157" to
0.314" can be used with these grips.
When installing the cables into the
enclosure, leave the strain relief
loose until the connections have
been routed with the enclosure fully
open. When completed, tighten the
grips with a wrench to prevent water
from wicking into the box. To pre-
vent water and other contaminants
from entering the junction box, fill
any unused cable grips with post screw plugs; P/N 19538.
10.750"
Ø.313"
If cables will be exposed to fluids, bend a short downward loop in all cables near the cord grips so any fluids
draining down the cables will drip off before reaching the junction box (see Figure 2-2).
Use a quality desiccant in the enclosure and replace it at least
every six months. Replace it more often if the environment is
very damp or is regularly wetted down.
If using the transient protection grounding feature, install the
fittings with a wrench and use an electrical grade lubricant such
as WD-40® on threads and fittings. Connect the ground lug to a
single system ground rod (if locally connected) or to the ground-
ing lug on the AC transient protector for the indicator or load cell power supply.
3.0 General Wiring Guidelines
The JB1010 is a universal trimming board, designed to trim almost any set of new or existing load cells in nearly
any configuration. To properly wire the JB1010, first determine what kind of application you have.
If the JB1010 is the only trimming junction box in a new system, continue on to the next page.
If the JB1010 replaces one or more boards in an existing system, skip to Section 8.0.
2
Free Datasheet http://www.datasheet4u.com/
5 Page 
8.0 Using the JB1010 In an Existing System
Large vehicle scales often have two, three, or four junction boxes connected into a network. When servicing
these scales, you don’t have a choice of what’s going to fail. When one of the junction boxes fails, it shuts the
whole scale down. The service technician rarely has the right board with him to replace a third party junction
board. As a universal board, the JB1010 can usually serve as a replacement.
The JB1010 can be adapted to match almost any common (and some uncommon) summing boards. To do this,
you can study the old board, look for isolation resistors, and see how the trimming works. Sometimes, however,
you have to make an intelligent guess.
Most large trimming boards use signal trim. If you see a large number of resistors on the circuit board, it is a good
bet that the board is a signal trim board. Most signal trim boards either have 2.5KΩ or 1KΩ isolation resistors.
If the board has both individual cell and section trimming, then there are often two sets of isolation resistors.
Use the following strategy to identify and match existing trim boards:
1. Are there many resistors on the existing board? If so, what is the value of the ones most prevalent on
the board. These are almost always the isolation resistors. If you can’t read the value, guess 2.5KΩ.
2. Are there any adjustment potentiometers for individual cells? Are there any adjustment potentiometers
for sections? Are there both? If there is only a single set of potentiometers, then use the value of the
isolation resistors. Guess 2.5KΩ if you aren’t sure. If there are both individual and section trimpots,
then choose the double isolation examples shown Section 7.0.
3. If you can’t find any isolation resistors, set up the board to disable trimming. Read on to tell if the trim
you have selected is correct. Disable any unused channels.
4. If the junction box you are replacing has an expansion port, use any unused cell (disable trim on it first)
as the expansion output.
In any case, power up the system and see if the indicator appears to work. If you get stable numbers, you are
on the right track.
If you are using signal trimming, you can tell if the isolation resistors match by the output of the cells. Put a
weight on cells connected to the existing box and record the value. Put the same weight on a cell connected
to the JB1010. If the reading is nearly the same, then the isolation resistor setting is probably correct. If the
weight from the JB1010 is much too high, then the isolation resistors you have chosen are too low for the rest
of the system or the system may have two layers of isolation resistors. If the weight from the JB1010 is much
too low, then the isolation resistors you have chosen are too high for the rest of the system. You must match
the isolation resistors as closely as possible so that the cell outputs are nearly the same. Once this matching is
done, then trim the total system like any other scale.
8
Free Datasheet http://www.datasheet4u.com/
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet JB1010.PDF ] | |
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