How to use and pay attention to the weighing junction box:
1: The connection between the load cell and the junction box
Pass the cable of the load cell through the weighing platform, and enter the Ningbo Goodshineintelligent junction box through the sealed joint, according to the different color codes of the four-core or six-core cables, or according to the positive and negative excitation power, positive and negative feedback, The positive and negative signals are connected to the corresponding terminals in the junction box. Bind the remaining cables of the load cell with plastic cable ties.
2: The junction box is connected to the weighing display instrument
Put one end of the special shielded cable into the junction box through the sealed joint, each core wire is connected to the corresponding terminal in the junction box, and the other end is welded to the special plug corresponding to the weighing display instrument through the metal tube, so that it can be inserted into the weighing indicator. Re-display instrument socket.
There are three points to note:
2.1: After the input and output lines in the junction box are connected, tighten, tighten and seal the joints, put desiccant, and do a good job of moisture-proof work, and then the junction box board can be fixed;
2.2: For different load cells, it is necessary to distinguish input, feedback, and output according to different color codes, and be sure not to make mistakes;
2.3: For different weighing display instruments, the types of weighing display sockets and plugs used are different, and the connection methods are even more different, so don’t make mistakes.
3: System grounding
The grounding of the electronic scale system is very important. It not only protects personal safety, but also ensures the stable and reliable operation of the system. The grounding measures of the system must not be underestimated. Generally, the electronic scale system has two grounding points, one is the grounding pile in the weighing room, which grounds the instrument shell; the other is the grounding of the weighing platform, and one or several grounding cables are used to connect the scale body to the grounding pile.
Load cell and junction box:
1: The connection between the load cell and the junction box
Pass the cable of the load cell through the weighing platform, enter the junction box through the sealed joint, and connect it according to the different color codes of the four-core or six-core cables, or according to the positive and negative excitation power supply, positive and negative feedback, and positive and negative signals after measurement. on the corresponding terminals in the junction box. Bind the remaining cables of the load cell with plastic cable ties.
2: The junction box is connected to the weighing display instrument
Put one end of the special shielded cable into the junction box through the sealed joint, each core wire is connected to the corresponding terminal in the junction box, and the other end is welded to the special plug corresponding to the weighing display instrument through the metal tube, so that it can be inserted into the weighing indicator. Re-display instrument socket.
There are three points to note:
2.1: After the input and output lines in the junction box are connected, tighten, tighten and seal the joints, put desiccant, and do a good job of moisture-proof work, and then the junction box board can be fixed;
2.2: For different load cells, it is necessary to distinguish input, feedback, and output according to different color codes, and be sure not to make mistakes;
2.3: For different weighing display instruments, the types of weighing display sockets and plugs used are different, and the connection methods are even more different, so don’t make mistakes.
3: System grounding
The grounding of the electronic scale system is very important. It not only protects personal safety, but also ensures the stable and reliable operation of the system. The grounding measures of the system must not be underestimated. Generally, the electronic scale system has two grounding points, one is the grounding pile in the weighing room, which grounds the instrument shell; the other is the grounding of the weighing platform, and one or several grounding cables are used to connect the scale body to the grounding pile.
The function and wiring method of the load cell junction box:
We generally use multiple load cells to measure the weight of objects inside. For example, a tank, silo, or platform with 4 support frames will have a load cell under each support frame. Alternatively the weighing platform could consist of a square plate with load cells located under each corner. The output values of the 4 load cells need to be averaged on site, and a single representative load cell signal output is sent to the weighing instrument or signal transmitter to be realized through the load cell summation junction box, which is sometimes referred to as for the junction box. However, it’s not just an empty junction box for connecting load cell wires, so you don’t have to connect 4 sets of wires to the control cabinet or connect the Ningbo Goodshinesmart weighing instrument. This integrates the electronics required to average or sum the load cell outputs into a single representation.
Considering that the key materials, strains and projectiles of Ningbo Goodshinesmart load cells are different, as well as factors in the manufacturing process, the main parameters of each load cell are not counted, usually the sensitivity is not counted, this kind of difference is Generally speaking, the angle difference is because the output signal of the load cell is connected to the junction box first after entering the junction box, and then sent to the instrument. The angle difference is adjusted by adjusting the potentiometer in the junction box, so that the sensitivity of each load cell is close to one. Number, so as to ensure the balance of the whole scale body.
Inside the junction box you will find the associated screw terminals marked on the printed circuit board. Each connected load cell will have an adjustment potentiometer. The potentiometer allows you to adjust the sensitivity of the 4 load cells to be equal, ensuring they give the same
output under the same load, resulting in more accurate readings than would otherwise be possible. In addition to combining the load cell signals, the junction box is also used to distribute the required excitation voltage to each load cell. The load cell junction box also provides 8 channels to support tools. Considering that the load cell junction box is field installable, it is possible to have an explosion proof enclosure for use in hazardous areas. They can also provide P67/IP68 moisture resistance;
Method Setup and Adjustment for Load Cell Summing Junction Box:
For example, take a flat installation environment as an example. A load cell will be installed under each corner. Rotate all potentiometers counterclockwise until all potentiometers are at the end point (they will click when rotating beyond the end point;
Connect all load cells. Apply the excitation voltage. Mount the test weight on top of the load cell or place the weight on the corner of the platform and record the output reading.
You can record the output in volts on the multimeter, or whatever the amp/readout meter indicates, like kilograms, etc.
Select the 4 that will have the lowest reading among the load cells and keep their potentiometers. It is recommended that you seal this potentiometer with some locking glue. Now place the test weight on the other load cell and adjust the potentiometer clockwise. The output reading associated with that load cell is the same as the output recorded by the load cell with the lowest reading;
Repeat step 2 on the remaining 4 load cells or horns, making sure that when the test weight is applied to each load cell, its potentiometer is adjusted until the output of the junction box is the same as mentioned in step 4. The output of the load cell is the same. Seal all potentiometers with
locking glue. All load cells are now standardized to contribute equally to the total output weight reading. On a floor scale, you should be able to center the test weight and still get the same output value.
You have now installed all 4 load cells under the system with all weights and set zero on the indicator or amplifier. Using test weights, you can begin calibrating your system. Set the amplifier or indicator output to read the correct weight of the test weight. It should only indicate the value of the test weight, not the weight of the system tank, hopper, etc. Recheck the zero and loaded weights, repeating with different weights, up to the maximum weight for which the system is designed. Next, remove all test weights. When the system is empty, adjust the amplifier or monitor to provide zero output. Add test weights and confirm correct reading one last time..
