Precautions before installation of electronic truck scale

It has always been considered in the concept of the user that the installation method of the electronic truck scale is very important, but it is often very important to ignore the preparatory work of the truck scale before installation. In this metaphorical way, we have studied very much since we were young. Our purpose is to lay the foundation for the university entrance examination. After the foundation has been laid, there is no need to worry about it. The same rationale for the pre-installation preparation of truck scales is to provide the basis for subsequent formal installations. Therefore, if the preparatory work is not done well, it will directly result in the electronic platform scale being unable to be installed and used. Therefore, the preparation work must be done well before the electronic platform scale is installed.

1. Determine the self-filtering strength of the digital sensor.

The setting of the digital sensor's own filter strength does not have a fixed standard, and generally it can meet the field use requirements. Based on field experience, we generally recommend that the filter intensity of the sensor be set 1 to 3 levels lower than that of the final electronic floor scale. Take HBM's digital sensor as an example. If our final truck scale actually uses 5 levels of filtering intensity, we can set the digital sensor of HBM below level 4 (above 0.5Hz). The subsequent filtering is done by the instrument. General instrument filter can be set at level 3 or above.

2. Determine whether the communication speed, data format, and communication string format used by the digital sensor are consistent with the internal definition of the digital meter. Digital instrument and digital sensor are connected by RS485 communication, so the communication speed (baud rate), data format (including the number of data bits, stop bits, verification method, etc.) must be consistent; at the same time, communication data and commands Can be parsed correctly, the communication string format must also be consistent with the string format of the transceiver. For example, HBM's digital sensor has 9600 and 19200 communication baud rates, 7-bit and 8-bit data bits, and there are three modes of check mode: no parity, odd parity, and even parity. The format of the communication string also exists in formats such as Formate1 to Formate4. If it is not cleared before use, it can easily cause great trouble for subsequent debugging.

If there are inconsistencies in the parameters, the digital sensor's communication baud rate and data format setting must be consistent with the instrument through the digital sensor's own setup software before installation. Some digital instruments such as Yaohua's XK3190-DS1, DS2, etc. have the function of automatically detecting and setting the communication parameters when they are turned on. Directly connecting the digital sensors to the instrument one by one can complete the communication parameter setting.

3. Set and identify the communication address of the digital sensor.

The electronic floor scale sets the communication address of the digital sensor, and some people are used to installing the sensor after it is installed. In order to facilitate the later installation and commissioning work, it is recommended that this work be done before the sensor is installed. Set up the operation to use the software that comes with the sensor, or use the communication address setting function provided by the digital meter. There is no uniform requirement for this, users can choose according to site conditions. The sensor address is preferably encoded in ascending order according to the installation order, for example 8 sensors. The communication addresses can be set to 1, 2, 3, 4, 5, 6, 7 and 8 in order. After each digital sensor is set up, it is best to make obvious identification in the eye-catching position of the sensor and the interface with the junction box to facilitate subsequent installation and connection.

4. Verification of the maximum output code value of the digital sensor.

The maximum output code value of the digital sensor (ie, the full-scale output code value) is generally not of concern to the general user. In fact, the maximum output code value and the accuracy of the measurement accuracy and the indication value that can be achieved on the electronic platform are the most important. Since truck scales employ multiple sensors, the actual signal range used by each sensor is generally within 1/3 to 1/4 F.S. If the maximum output code value is 30,000 yards, if each sensor uses 1/4 range For the signal, the actual maximum output code value of each sensor is 7500 yards. If the entire scale body is composed of 8 sensors, the actual output of the scale body is 60,000 yards. If the scale is finally calibrated with an accuracy of 1/5000, then each d = 12 yards. In this case, the sensor will produce 1 index jump per 6 beats, which will lead to the final indication instability; at the same time, for the car The final zero processing of the scale also brings many problems.

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