Truck scale is a commonly used measuring equipment for bulk goods measurement. Regular inspection and verification can minimize errors and improve the quality of use. By analyzing the product verification, troubleshooting and maintenance of common faults, relevant technical measures are proposed.

 

1. Verification steps

 

For newly purchased truck scales that are about to be put into use after installation or maintenance, verification must be carried out. To ensure the smooth development of various tasks, preparations must be made; first check whether the components are complete, such as weighing display, sensor, scale body, etc. Secondly, check the underside of the weighing platform, check whether there is any debris or whether it is placed flat, and clean up the site. Re-verify the fixed standards of the four corners and the level of the scale body. After confirming that each installation meets the standards, close the meter circuit and perform standard verification after warming up.

 

2 Initial verification

 

For new products, products that are about to be put into use after installation, or imported products, the first verification must be carried out in accordance with national measurement regulations and technical operating procedures.

 

3 Follow-up verification

 

For truck scales that have reached the standard for the first verification, follow-up verification is required before being put into use, mainly to determine whether the maximum allowable error is consistent with the result of the first verification.

 

4 standard verification

 

For truck scales that are qualified for the first and subsequent verifications, their operating standards should be identified after they are put into use. First, whether the components and supporting equipment of the verification meet the standards of the first verification, meet the verification requirements, whether the use performance is good, and whether the measurement data Accurate; second, check the relevant qualification certificates. Third, the maximum allowable error must not exceed twice the initial verification before it can reach the working standard.

 

Two, common weighing instrument failures and troubleshooting methods

 

① Visual inspection method. Combined with the instructions, carefully observe whether each component is normal.

 

②Measurement method. For the instrument, circuit or related parts in doubt, use a universal meter to measure the resistance and voltage at both ends to check whether it is normal.

 

③Replacement method. Use standard originals to replace the problematic parts, and compare their work results to see if they are the same.

 

law. For the problem of vulnerable parts or improper operation, the indicator will display an error code to prompt, and you can consult the manual in time for troubleshooting.

 

⑤Reconnect the line method. Poor contact of the circuit plug, insurance or chip will also affect the normal use of the product. The way to eliminate the fault is to re-plug all the plugs and chips.

 

3. Common fault types and maintenance technology

 

1. The fault type and adjustment technology of the meter reset

 

1) The foundation is not strong, which affects the return of the meter. The truck scale instrument does not return to zero, on the one hand, the foundation is uneven; on the other hand, the equipment is not firmly placed. Solving these two problems can ensure that the meter returns to zero.

 

2) Poor ground connection. The truck scale has a high precision, and the resistance of the energized circuit must be less than 4Ω. Poor grounding can also cause the meter to not return to zero. The repair technique is to repair the grounding stake.

 

3) Improper limit causes the meter not to return to zero. After the horizontal and vertical limit devices of the scale body are fixed, due to thermal expansion and contraction, the limit bolts are not adjusted in time, and the scale body is sometimes pushed to the side, causing the meter to not return to zero. The elimination technique is to adjust the limit in time according to summer expansion and winter contraction.

 

4) The sensor is damaged and the meter does not return to zero. Damaged sensors are the main reason why the meter does not return to zero. The repair technique is to replace the sensor.

 

5) Inadequate maintenance will also affect the meter. Truck scales are generally placed outdoors, and sundries such as dust, leaves, coal, sand, and stones spilled from vehicles can block the standard gap at any time. Affect the instrument to zero; the maintenance method is to ensure high-standard daily maintenance.

 

2 The number flashes to indicate possible faults and maintenance techniques

 

When there are three kinds of faults, it may cause the indicator numbers to flicker. One is that there is a problem with the meter or the power supply system is unstable; the other is that the sensor's plug is in poor contact or the junction box is damp; the third is that the wiring circuit is in poor contact. The repair technique is to replace the meter, check the power supply, sort out the circuit, and dry the junction box with a hair dryer.

 

3 Non-display, cyclic display prompts failures and maintenance technology

 

The first is the instrument failure; the second is the sensor problem; the third is the poor contact of the power supply line. The faults that cause this type of fault are generally comprehensive. Therefore, it is necessary to use a universal meter to check and detect the circuit and the original one by one. Repair technology is to replace components, strengthen line joints, etc.

 

4end01-erd08 fault and repair technology

 

This is a communication failure signal, the most likely is that the communication between the instrument and the sensor is interrupted. The basic steps and techniques for repairing this type of failure are to check the power supply system of the sensor first. The first step is to check the junction box. If the junction box is not defective and in good working condition, all indicators are standard, then check the wire circuit and take a look. Whether there is power outage caused by open circuit, short circuit or other uncertain factors. The technique to repair this type of failure is to replace the sensor and repair the circuit.

 

5 Faults and repair techniques that indicate the loss of calibration data

 

Various factors, such as power supply problems, ungrounded sensors, ungrounded weighing platforms, and replacement of ground wires by the neutral wire, will cause the calibration data to be lost. This will affect the unstable communication of the sensor, live working of related equipment, and damage the instrument. The basic technical point for repairing this type of fault is to check the grounding status of the power supply first. If the grounding state is not good, it must be repaired quickly. It is a circuit problem. Repairing the circuit is a component problem and re-installation and debugging. Ungrounded factors are absolutely not allowed.

 

Four, conclusion

 

Truck scale is a high-precision measuring equipment. The verification of each link is the basis to ensure the high standard service of truck scale. Therefore, the product verification must be carried out in strict accordance with the national measuring instrument testing step standard to ensure that the product is qualified before it is put into use ; In the course of use, the owner or staff must carefully do daily maintenance, remove dust and surrounding garbage, regularly check the damage of wiring, meters, sensors and other components, and repair them in time.