Maintenance and common problems of weighing instrument
The weighing instruments used in weighing equipment belong to the category of high-precision instrument equipment. The installation, application, and maintenance must be done in accordance with the regulations in the instructions for use to ensure the safety of the instrument panel, and everything is normal. accurate. Otherwise, it is very likely to cause damage to the dashboard or reduce its service life. 1. Generally, the instrument panel should be placed in a natural environment with clean, dry, natural ventilation and suitable temperature for installation. The instrument panel should be fixed, and there is no need to move it often, otherwise it is likely to cause the internal wires of the communication cable power plug to fall and cause common failures. 2. Switching power supply weighing instruments mostly use 220 volt alternating current, and the allowable range of working voltage is generally 187 volts ---242 volts. After changing the switching power supply route, remember to accurately measure whether the working voltage meets the regulations before connecting the power supply to the instrument panel. If the 380V switching power supply is mistakenly connected to the instrument panel, it is likely to cause damage. Places where the power supply voltage fluctuates greatly should be equipped with a regulated power supply with excellent characteristics to ensure all normal applications of the instrument panel. It is not necessary to use the same power plug with strong interference signals (such as motors, electric bells, fluorescent tubes) to prevent unstable information values u200bu200bdisplayed on the dashboard. Some dashboards are dual-purpose for AC and DC power supplies. Be aware when installing into battery applications, battery leakage will destroy the dashboard. When the rechargeable battery power supply system is not used for a long time, the rechargeable battery should be removed. 3. The weighing instrument of the grounding device should be connected to a separate and good wire connector (the resistance of the grounding wire is less than 4 ohms, and the wire of the grounding device should be as short as possible). The wire connector has a two-way function: it not only maintains the safety of the actual operating staff, but also has a key anti-interference function, which can ensure the smooth operation of the instrument panel. The ground wire is connected to the instrument panel power plug. If the instrument panel is connected The grounding wire is connected to the public weak current protection area network, which is likely to affect the switching power supply of the instrument panel and make the information value displayed on the instrument panel fluctuate. Regular maintenance of the grounding wire node is not good. After a long period of time, the air oxidation and rust caused by the nodes will cause the instrument panel to actually fail. 4. Sun protection should prevent the sun from shining on the gray-black case of the dashboard, otherwise it may cause the dashboard office environment to exceed the rated temperature range and be destroyed. 5. Moisture-proof Under normal conditions, although the ambient humidity of the dashboard office environment reaches 95%, it is required not to cause condensation. The unique stainless steel case with moisture-proof effect is outside the instrument panel. 6. Anti-corrosion chemicals must not penetrate into the dashboard, otherwise it will etch the components on the pcb circuit board and the pcb circuit board itself. Over time, it is likely to damage the dashboard. Even the instrument panel with anti-corrosion effect, if the closed type is not tightly closed, the same result will occur. 7. The anti-electric shock weighing equipment belongs to the integrated wiring system, which is very easy to be attacked by lightning and destroy the components. The key to lightning strikes enters the dashboard from two levels: guided by the power plug and guided by the weighing platform via the data signal cable. Under all normal temperatures, the actual operating staff can control the main power switch, but in the case of close lightning strikes, be sure to unplug the power cord of the instrument panel and the power plug of the communication cable of the weighing platform. It is best to adopt anti-electric shock countermeasures, such as lifting anti-surge protectors in the switch power supply control loop of the dashboard. 8. The zero line of the live wire of the switching power supply above 220 volts to prevent weak current accidentally hits the weighing platform or uses the weighing platform as a ground wire, and the actual operation of arc welding on the weighing platform is likely to destroy the instrument panel. 9. Cleaning In the natural environment of industrial production, if there is dust or environmental pollution on the dashboard cabinet, be sure to wipe it off with a wet towel often when the power is turned off. But be careful not to scrub the display information window with organic solvents such as ethanol, otherwise the light transmittance will be affected and the displayed information will be blurred. 10. Once the instrument panel is damaged, it needs to be repaired. In order to better accelerate the speed of round-trip transmission, some companies prefer to remove the PCB board of the dashboard and use expedited express mail, which creates a problem of anti-static. When taking the PCB board, hold the four corners of the board by hand, and don't touch the area with field effect pins. Because that is very easy to damage the FET by electrostatic induction. The disassembled PCB should be put into the shielding bag immediately, and it can be wrapped in general newspapers without the shielding bag. If the board is placed on a desktop with a high insulation layer, it is very likely to destroy the PCB board. When receiving the repaired PCB board and having to install it in the instrument panel again, also pay attention to anti-static. 11. When transporting the anti-vibration instrument panel, it is best to put it in the original wooden box, or adopt suitable anti-vibration countermeasures. 12. Explosion-proof type If the instrument panel is used in composite or intrinsically safe explosion-proof system software, the relevant requirements of explosion-proof type shall be complied with. 13. Job Responsibilities Weighing equipment is a relatively excellent weighing equipment, and the actual operation and maintenance should be professionally undertaken by trained staff. At this stage, most weighing instruments clarify the functions and characteristics of electronic weighing instruments based on the main parameter settings and calibrations on the mobile phone software. Once this main parameter is changed randomly, it is likely to compromise the accuracy and function of the weighing (such as no copying or no communication, etc.). Therefore, it is also very important to clarify the respective job responsibilities of actual operation staff and maintenance staff.
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