September 7, 2023

Weighbridge junction box connection method and interpretation of installation and commissioning

The weighing junction box is a device commonly used to connect weighing load cells and indicating instruments, data acquisition instruments and other equipment. It usually contains multiple terminals, which can convert, amplify, and filter the output signal of the load cell, and output the processed signal to devices such as indicating instruments or data acquisition instruments for data recording and analysis. The weighing junction box can not only effectively reduce the interference and error of the signal line, but also facilitate the wiring and maintenance of the signal line, thereby improving the stability and reliability of the weighing system.


It works as follows:

First, the Ningbo Goldshine intelligent load cell measures the weight of the object being weighed and converts the signal into an electrical signal. This electrical signal needs to be processed and converted through the weighing junction box before it can be received and processed by the controller or instrument.

In the weighing junction box, the electrical signal is amplified, filtered, denoised and amplified to ensure the accuracy and stability of the signal, and output to the controller or instrument. In some high-precision application scenarios, the weighing junction box can also perform linear compensation and temperature compensation to improve measurement accuracy.

In general, the function of the weighing junction box is to process the electrical signal of the load cell into a signal suitable for the controller or instrument to receive and process, and to provide some signal processing and compensation functions in the process.

Installation of the weighbridge junction box:

Fix the junction box at a suitable position on the scale body, and open the top cover of the junction box. Pass the load cell cable and instrument signal cable through the corresponding interface of the digital junction box, connect all the cables according to the instructions, and tighten all the nuts after completion. The unused interface can be blocked with a sealing rubber

gasket or plasticine, and the nut should be tightened at the same time. Connect the outer shields of all cables to the grounding post of the digital junction box. The installation is complete. The analog load cell is equipped with a corresponding analog junction box, while the digital load cell is equipped with a corresponding digital junction box. Do not confuse them during use, otherwise the relevant electronic components may be burned. One thing to note is that the digital junction box can be used for analog load cells, while the analog junction box can only be connected to analog load cells.


Commissioning of the weighbridge junction box:

After installation, some debugging is required. Regarding this point, there are different debugging methods according to the different types of Ningbo Goldshine intelligent junction boxes. If it is an analog junction box, you can first adjust the corresponding potentiometer according to the output signal of the load cell and refer to the wiring diagram in the manual. But it should be noted that the potentiometer must not be adjusted too far. After debugging, the upper cover of the digital junction box should be covered, and at the same time, the screws need to be tightened. And if it is a digital load cell, it can be connected correctly according to the manual. The internal debugging can be done by debugging the software in the Ningbo Goldshine intelligent weighing control instrument. Relatively speaking, the debugging of digital electronic floor scales is relatively simple. Wireless Operate on the scale body.

When we decide to buy an electronic truck scale and choose a good truck scale, the first thing to do is the basic engineering installation steps of the electronic truck scale, that is, the electronic platform scale, which is divided into eight steps to complete.

1: The basic structure of the electronic truck scale (weighbridge) is divided into two types: shallow foundation pit and no foundation pit. Our company provides users with scheme drawings according to their needs.

2: According to the basic plan drawings provided by the user, combined with the geological conditions of the site, the user proceeds to the construction drawing plan. Special attention must be paid to three issues in the construction plan:

2.1: Basically, the bearing capacity of plain soil (earth endurance) shall not be less than 20t/m2. If the site geological conditions do not meet this requirement, reinforcement must be done.

2.2: Basic excavation must be dug below the local permafrost line.

2.3: For shallow foundation pits, drainage channels must be planned. There is basically no foundation pit to consider the surrounding drainage problems to ensure that the truck scale will not be submerged in the water due to rain.

3: The vertical and horizontal steel mesh in the basic concrete needs to be bundled with 16# iron wires for more than 50% of the intersection points, and connected to each iron floor with steel bars (used as the ground wire of the load cell).

4: The embedded parts (iron bottom plate, anchor bolts, angle iron edge protection, etc.) in the basic construction shall be prepared by the user. Measures must be taken during construction to ensure the correct position of the anchor bolts and the iron floor. For this reason, it is suggested to adopt the method of secondary grouting for positioning, and it is necessary to ensure that there is no cavity between the iron bottom plate and the concrete. During the construction, it is necessary to ensure that the levelness and elevation of each iron floor meet the requirements of the basic plan drawing. The contour difference of the center of each iron bottom plate shall be less than 2mm, the horizontal inclination of the iron bottom plate shall be less than 1/500, and the diagonal deviation of the center distance of each iron bottom plate shall be less than 2mm.

5: After the basic construction is completed, attention must be paid to maintenance. In order to shorten the construction period and maintenance time, it is allowed to add “early strength agent” and other measures to the concrete during construction. The weighing platform shall not be installed when the concrete has not reached the strength of the scheme.

6: The weighing room scheme of the electronic truck scale is determined by the user according to the actual needs: a grounding wire and 220V power supply must be installed in the weighing room for the use of the weighing control instrument. The weighing room must be close to the weighing platform. In special circumstances, please inform our company in advance.

7: Users in the northern region should consider heating in winter. Users who have the conditions use air conditioning or heating, and coal stoves are not allowed in the weighing room.

8: The weighing signal cable leads from the weighing platform and enters the weighing room through a metal tube. It is recommended to use a 1-inch metal tube and at the same time pass through the iron lead of the cable.


Ningbo Goldshine Intelligent Co., Ltd. is committed to providing users with high-quality weighing instruments, advanced weighing solutions and first-class after-sales service, and has built the company into a comprehensive electronic weighing instrument supply platform enterprise. Customize products according to customer needs and provide system weighing solutions. The company has a complete sales management and pre-sales after-sales service system, with a professional sales team and high-quality after-sales service, to provide customers with meticulous and thoughtful product services.


Precautions for connection of ground scale junction box:

1: After the input and output lines in the junction box are connected, tighten, tighten and seal the joints, put a desiccant, and do a good job of moisture-proof work, and then the junction box cover can be fixed;

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;

3: For different weighing displays, the load cell sockets and plugs used are different, and the connection methods are even more different, so don’t make mistakes.

4: When wiring, ensure effective grounding to prevent the electronic truck scale from being damaged when lightning strikes.


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