The electronic floor scale error causes the weighing to be inaccurate
Electronic floor scale application range: The correct use range of the loadometer is about 70%, and the upper limit of the loadometer is generally not more than 90%. Long-term load use affects the service life of the sensor. Your floor scale range of choice is suitable for your application.
Such as: general weighing range of about 30-70t, should choose 100t weighbridge.
The electronic floor scale has been used for a long time because the third aspect causes the floor scale to weigh inaccurately on the floor scale. What should be done? The maintenance method is as follows:
The 100-ton electronic floor scale is conventionally an error of 20kg, but in the course of weighing, the error of a 100-ton electronic platform scale becomes 50kg, or the weight value of each corner is different. How can we solve this kind of time?
Electronic floor fault phenomenon: a heavy truck (about 100 tons) in the parking position of the scale is different, the value of the weighing is different.
Analysis and processing:
1. From the fault phenomenon, it can be analyzed that the weight of each scale (a total of 8 points) of the scale is large, the excitation voltage and output signal of each sensor are tested, and compared with the original record, it is found that the voltage of the northwest medium sensor to stimulate the electronic weigh scale is large, check the terminal block (At the junction box) A problem with the trim resistor was found and the junction box was considered to be a problem. Replace the junction box, press with a weight (8 points), calibrated with a standard checker.
2. After checking the scale body, limit device, junction box, sensor force status, all plugs, and information lines with no problem, use a weight press (8 points), calibrate with a standard inspection scale, or calibrate with a full-scale weight. .
Note: For the large difference processing, we must carefully and carefully check the various components, test the input and output voltage of the sensor, after confirming the cause of the malfunction, we can use the method of pressing the point with the weight.
Electronic floor fault phenomenon: The meter display is not normal, up to 8 tons at zero drift, sometimes stable, short failure duration, sudden large, sometimes days, sometimes a few hours.
Analysis and processing:
1. Test instrument input and output voltages, grounding wires and contact conditions of the connection plugs are all normal; suspect that the instrument performance is bad, replace the new meter, the school scale is qualified, the above-mentioned failure phenomenon occurs again in a few days, and the cause of the meter is excluded; Power supply section of the instrument, to see whether there is strong electromagnetic interference around the measurement room, found after the measurement room has a large disk hung and machine tools and other equipment. When the instrument indicates a stable value, the above equipment is repeatedly started and stopped, the instrument indicates that the values ​​are stable, and the external electromagnetic interference is eliminated; the power supply of the instrument is taken again, the UPS power is removed, and after a few hours, the above-mentioned failure phenomenon is found again;
2. When the meter shows the above phenomenon again, without turning off the power of the meter, immediately open the sensor junction box and test the sensor signal one by one. It is found that the output signal of the northwest corner sensor varies between 1.1mv and 4.7mv, and the excitation voltage does not change and the meter is turned off. After the power is turned on again, the meter shows stability, and the signal of the sensor is tested to be unchanged at 1.1mv.
3. Recall that in the past few days, when the instrument indicates that the value is drifting, after the power is turned off and then the instrument is powered, the indication value is stable and is consistent with the above test results. Therefore, it is determined that the sensor has a problem.
4. Replace the sensor and re-calibrate the scale. So far, the scale is operating normally.
Remarks: The replaced sensor (CZL-YB-7J 30t) is returned to the factory for verification, and several indicators have passed the test.
Electronic scale special instructions:
1. Solving weak transmission signals and interference problems The output signals of analog sensors are generally in the tens of millivolts. During the transmission of these weak signals from cables, it is very easy to be interfered with, which results in unstable system operation or reduced measurement accuracy. The output signals of digital sensors are all around 3-4V, and its anti-interference ability is much larger than that of analog signals. It has strong moisture-proof and anti-corrosion capabilities. The digital sensors are made of stainless steel welded housing and they are extremely waterproof and moisture-proof. Anti-corrosion capability, protection class IP 68, suitable for all kinds of harsh working environment. Digital sensors have a lightning protection design and are particularly important when installed in multi-ray areas.
2, to solve the time effect of creep problems When the load is added to a load cell for a long time, the output often has a large change, digital load cell software through the internal microprocessor, automatically compensated for the creep without weighing Redisplaying the Meter Reduces the Failure Rate of the Truck Scale The digital truck scale can be directly connected to the computer to display the weighing process, which reduces the weighing troubles. Now that the computer hardware is extremely reliable, the resulting weighing system is more secure and reliable.
3, to solve the problem of partial load temperature
Digital electronic truck scales automatically compensate and adjust for the effects of offset loads and temperature changes. Consistency and interchangeability are good. After multiple sensors are connected in parallel to a group scale, linear correction and performance compensation can be achieved by using software methods to reduce systematic errors and simplification of on-site installation, adjustment, calibration and adjustment of the scale body.
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