Asphalt Concrete Mixing Plant Dosing And Weighing System Line Faults:
Mixing plant batcher of each electronic weighing system all by mixing tank (scale), weighing sensor, junction box, control instrument and connecting parts, use common in poor preparation scale is not stable, drifting, linear failure, affect the normal work of the station.
Dosing and weighing machine line fault, display an error message, weighing signal suddenly or disorderly jump, reason has the following two cases:
1. One is the sensor itself quality has a problem. Show the sensor input, output, resistance to change. Sensor input resistance is normally 400 Ω + 10 Ω, the output resistance of 350 Ω Ω plus or minus 3. Sensor is the main fault, terminal or lead solder joints fall off; Zero temperature compensation or sensitivity to temperature sensor to compensate the resistance virtual soldering or desoldering. Internal chip sensor seal is bad, be affected with damp be affected with damp.
2. The second is the connection between the sensor and control meter line open circuit. The external fault is mainly was caused by improper installation and use, if use multimeter to check sensor input and the output resistance, resistance are normal. The cause of failure is: wire broken, cause break; Cable is loose or not use soldering welding joint, etc.
Electronic scale zero anomaly is also more common fault. One reason for this is not to do temperature compensation of sensor and sensor’s zero point and sensitivity changes with the change of environmental temperature, lead to electronic scale zero malfunction, according to international standard sensor with temperature compensation in the process of production process, should through the high and low temperature box analog sensor using the environment temperature compensation, but many domestic sensor manufacturers have no high and low temperature box, can’t make a temperature compensation of sensor; Second reason is sensor serious overload, resulting in elastomer plastic deformation and damage of sensors.
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Post time: Jul-31-2017