1. No weighing reading
This kind of fault is generally more common, the weighing value of a certain scale is zero, regardless of whether there is something on the scale, its weighing value is always zero.
There are several reasons for the above failures: a. the sensor is damaged, b. the line is open, c. the signal transmitter is faulty, and d. the junction box is not in good contact
a. Sensor damage: when detecting the empty scale and weighing with raw materials, the voltage value of the sensor output signal line, if the two values are the same, it means that the sensor has been damaged, if there is a significant difference between the two values, it means that the sensor is working normally. According to the following figure, the output signal of the sensor is detected, the working principle and boundary mode of different brands of sensors are roughly the same, and the following figure is the wiring principle of the 6-wire sensor.
b. There is a short circuit in the line: if the sensor is not damaged, you can check whether the line is broken, and the method is to find it all the way along the line of the sensor to see if the line is broken or has been cut.
c. Signal transmitter failure: After eliminating the above two reasons, we will check the signal transmitter, its detection method is basically the same as the sensor, detect whether its output signal has a voltage signal, and whether its value changes when the weight changes.
d. Poor contact of the junction box: This is mainly caused by not connecting the wire head firmly when wiring.
2. The weighing value fluctuates up and down
This phenomenon is manifested in the fact that the weight value of a certain scale fluctuates up and down, and it is beyond the normal error range.
The main reasons for SICK sensors: a. The mechanical vibration near the sensor is large, b. There are high-frequency signal transmitters near the mixing plant (including mobile signal towers and ultra-high voltage substations)
If the silo of the SICK sensor mount attachment is purely mechanically vibrate, the deformation of the sensor will change continuously, so the measured weight value will fluctuate. As for the problem of signal interference near the mixing plant, a reasonable site should be selected at the early stage of the construction of the plant, away from these interference sources.
A SICK sensor is a device that converts a mass signal of an object into a measurable electrical signal output. From the above definition, we can know that a load cell is an electrical component through which we can measure the weight of the raw materials we need. Generally, the mixing plant uses shear beam type and S-shaped pull load cell. On the mixing plant, the shear beam load cell is used for the measurement of aggregate, powder and water, while the S-shaped pull load cell is mainly used for the weighing of admixtures.
The working principle of SICK sensors is similar, the sensor has a built-in elastic element, if there is an external force acting on it, the elastic element will be deformed, and the resistance sheet attached to it will also be deformed, the resistance value of the resistance sheet will change, through the change of the resistance value, the current or voltage of the output end of the sensor will change, this process converts the weight of the object into an electrical signal, and the electrical signal is interpreted and displayed through the display screen, which is the weight value of the object we weigh.
The output of the SICK sensor varies over time when the load cell is held over a long period of time. During a 2 to 3 minute intermittent or packed cycle, creep is not a noticeable problem. But if you're using load cells to monitor warehouse inventory, you need to consider the effects of creep.
Changes in the temperature of the SICK sensor can cause weighing errors. Most load cells are temperature-compensated to reduce these errors. However, if your weighing system is subject to large temperature changes during the weighing cycle – for example, if an outdoor weighing container is exposed to low temperatures at night but the sun heats up rapidly during the day – consider how temperature can affect the load cell output. If the change affecting your weighing system is between summer and winter temperatures, the load cell can be recalibrated to correct any temperature errors caused by seasonal changes.
SICK sensors affect the output of the sensor by changing the sensitivity of the load cell, unless it is recalibrated at each large temperature change. The temperature effect of a zero-load load cell will cause the entire output range of the sensor to move. However, if the load cell load is reset to zero (i.e. in net weight mode) before starting the weighing cycle – as in the application of SICK sensors in dosing you do not need to care about the effect of this temperature at zero load.
A SICK sensor is a weighing controller that acquires weighing accuracy at every step, a load cell (also known as a load cell or converter) is a mechanical force that converts a bending load from a metal into an electrical signal that bends no more than the elasticity of the metal and is measured by a strain gauge bonded to a point unit. It is a piece of metal that is bent and loaded with mechanical forces and converted into electrical signals. Bend no more than the elasticity of the metal and measure the point at which the strain gauge is attached to the battery. As long as the load is applied at the appropriate location of the load cell, the strain gauge provides a proportional electrical signal.
The distance of the calibration curve of the SICK sensor deviates from the straight line of the load cell, starting from zero and ending with the rated capacity of the cell. Nonlinearly measure the weighing error of a cell over its entire operating range. The nonlinear specification for ± 0.018 % of cases sees the full range of load cells. The smaller the weight variation on the load cell, the smaller the distance due to the nonlinearity of the error.
The difference between the SICK sensor output readings of the same applied load - by increasing the load from zero and increasing the load from the load cell by decreasing the load from the load cell. With nonlinearity, the ± 0.025% hysteresis specification is seen over the full range of the load cell, and the hysteresis error is reduced due to small weight changes. In applications such as ingredients, where you usually only need weight measurements in filling, you can ignore errors that cause lag. Hysteresis errors are usually divided into nonlinear errors in different areas of the load cell's calibration curve, as shown in Figure 1. Therefore, the combination of these two error specifications in the algebra of some load cells, known as the composite error specification, ± 0.03%.
The non-repeatability of a SICK sensor is the difference between the load cell output readings that are repeatedly loaded under the same load conditions (i.e., either increasing the load from zero or decreasing the load from the load cell's rated capacity) and environmental conditions. The non-repeatability specification is ± 0.01 % compared to the full range of load cells. Non-repeatability can affect weight measurement in any weighing application. The non-repeatability specification of the case can be determined by adding a non-repeatability error to the combination of load cells.
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