DINI ARGEO JB Equalised Junction Box User Manual
- June 12, 2024
- DINI ARGEO
Table of Contents
DINI ARGEO JB Equalised Junction Box
Product Information
The product is a junction board for load cells, specifically designed for analogic and digital load cells. It has various technical features and can be used for series connection with multiple boards.
INSTALLATION WARNINGS
- A flat and levelled laying surface.
- Stability and absence of vibrations.
- No dust or strong vapours.
- Levelled platforms or even laying surface of the load cells.
- Moderate temperature and humidity (15-30° C and 40-70%).
- Make sure about correct earthing.
- Avoid welding of load cells installed.
- Use waterproof connections and sheaths to protect the load cell cables.
- Use waterproof junctions boxes to connect the cells.
- Everything not expressly described in this manual has to be considered as improper use of the equipment.
- Tighten well the unused holes by means of caps.
- Connect the junction boxes to the grounding point with a short cable with a minimum cross section of 50mm2.
TECHNICAL FEATURES OF THE JUNCTION CARDS
- Maximum input voltage: 24Vdc.
- Maximum input current. 700mA
- Maximum input load cell signal: 1000mV
- Temperature effect: 50ppm/°C
The 10 load cell version is fitted with Surge Arresters, against overcurrent and over tension.
ANALOGIC LOAD CELL
LOAD CELL CONNECTION
Note: with 6 cables load cells, SENSE+ must be short-circuited with EXC+,
and SENSE- must be short-circuited with EXC- .
CONNECTION TO INDICATOR
SERIES CONNECTION WITH 2 OR MORE BOARDS
DIGITAL JUCTION BOARD
6 WIRES LOAD CELL CONNECTION
4 WIRES LOAD CELL CONNECTION
RCPTD LOAD CELLS CONNECTIONS
For the proper functioning of these load cells, the switch must be set to OFF
(see below).
For
the connection of the cable of the load cells on the board, follow the
instruction of the previous paragraph.
CONNECTION TO INDICATOR
SERIES CONNECTION WITH 2 OR MORE BOARDS
- The first board must have all termination jumpers open (including S1).
- Cell terminal 10 is not used for connecting the cell, but for connecting the second board. Only use pins 4 and 6 in terminal CELL10.
- The second board must have the termination jumper closed on the last connected cell.
- The indicator must have the 485 line termination resistor active.
TERMINATION JUMPER
According to the number of connected load cells, it is necessary to close one
of the jumpers which are on the board
- If the number of installed load cells is 10, or only one load cell is present, there are no jumpers to close.
- If the number of the installed load cells varies from 2 to 9, the jumper to close is always the one corresponding to the last cell (in numerical order).
- On the other side of the line it is necessary to install the 120 Ohm termination resistance between A(+) and B(-) clamps.
- Example: if there are 8 load cells, the jumper to be closed is J8.
EQUALISATION PROCEDURE
- Tighten all trimmer screws, in clockwise orientation.
- Carry out the calibration with a standard weight of about 1 / (n – 1) of the capacity (where n is the number of the cells). Position it centrally.
- Put the standard weight near to the points corresponding to the load cells. Identify the cell with the lowest visualized weight.
- Adjust the remaining cells in order to have on all of them a weight equal to the cell with the lowest signal. Follow these steps:
- Position the standard weight on the point corresponding to the cell with the highest weight.
- Loosen (anticlockwise orientation) the cell trimmer’s bolt until the weight is equal to the one of the cell with the lowest value.
- Repeat steps “A” and “B” for the remaining points related to the cells.
- Check again that each point corresponding to the cells has the same weight. If so, carry out the calibration again, by positioning the standard weight centrally. Otherwise, repeat the points 3 and 4.
N.B. For a good equalization of the system, it is advisable to use a high resolution visualization and a compact standard weight, with a laying surface reduced as much as possible.
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