1、 Power supply and communication failure

1. Unable to function properly
   • phenomenonThe sensor has no indication or abnormal output signal.
   • solution：
     • Check if the power connection is correct, ensure that the power supply voltage is stable and meets the requirements of the sensor.
     • Check if the communication line is disconnected or loose, reconnect or replace the cable.
     • If the problem persists, it may be a damaged sensor and a new sensor needs to be replaced for testing.
2. Communication failure
   • phenomenonThe sensor cannot communicate with other devices (such as controllers).
   • solution：
     • Check if the communication line connection is correct, including interface type and line sequence.
     • Confirm if the communication protocol settings (such as RS485, Modbus, etc.) match.
     • If the problem persists, it may be a fault in the sensor communication module and the manufacturer needs to be contacted for repair.

2、 Abnormal reading

1. The reading does not match the actual situation
   • phenomenonThe sensor output value deviates significantly from the actual tension.
   • solution：
     • Calibration errorRe calibrate the sensor and follow the calibration method provided by the manufacturer (such as using standard weights or tension calibrators).
     • Range mismatchCheck if the sensor range is consistent with the controller settings (e.g. if a 500kg sensor is mistakenly set to 100kg range), adjust parameters or replace the sensor.
     • Sensor damagedIf the calibration is still abnormal, it may be due to a broken strain gauge or an unbalanced bridge inside the sensor, and the sensor needs to be replaced.
2. The reading is unstable
   • phenomenonThe reading fluctuates greatly, sometimes high and sometimes low.
   • solution：
     • Loose connectionCheck if the connection between the sensor and the object being measured is secure to avoid poor contact caused by vibration.
     • External interferenceStay away from electromagnetic interference sources (such as motors and frequency converters), or use shielded cables and single ended grounding.
     • mechanical vibrationOptimize mechanical structure and reduce vibration transmission (such as using elastic couplings).

3、 Installation and mechanical failure

1. Improper installation
   • phenomenonThe sensor has a large measurement deviation or is easily damaged.
   • solution：
     • Alignment calibrationUse a laser calibrator to ensure that the coaxiality between the sensor axis and the transmission shaft is ≤ 0.1mm, in order to avoid bending moment errors caused by eccentric loads.
     • Flange fixationSelect high-strength bolts (such as grade 12.9) and tighten them three times in diagonal order to ensure that the installation surface roughness is ≤ Ra3.2 and the contact area is>85%.
     • Coupling matchingUse an elastic diaphragm coupling to avoid vibration transmission from a rigid coupling, and reserve a 0.5-1mm gap in the axial direction to compensate for thermal expansion.
2. mechanical damage
   • phenomenonThe sensor housing is deformed or the internal strain gauge is detached.
   • solution：
     • Prevent the sensor from being impacted or overloaded by external forces (such as using beyond the range).
     • Regularly inspect the appearance of the sensor and replace it immediately if any deformation or cracks are found.

4、 Malfunctions caused by environmental factors

1. temperature effect
   • phenomenonReading drift in low or high temperature environments.
   • solution：
     • Choose temperature resistant sensors (such as high temperature water cooling type, low temperature antifreeze type).
     • Add a thermistor to the sensor signal conditioning circuit and enable temperature compensation algorithm through software.
2. Humidity and Corrosion
   • phenomenonMoisture or corrosion inside the sensor can cause short circuits or poor contact.
   • solution：
     • Choose sensors with high protection levels (such as IP67) to avoid use in humid or corrosive environments.
     • Regularly check the sealing of the sensor and promptly clean or replace it if oil or moisture seeps in.

5、 Execution mechanism and load issues

1. Execution mechanism malfunction
   • phenomenonThe sensor reading is normal, but the tension control fails (such as the magnetic powder brake not working).
   • solution：
     • Check if the power supply of the actuator is normal (for example, the magnetic powder brake requires DC24V power supply).
     • Measure the current of the actuator. If it continues to overload (>1.2 times the rated value), upgrade the controller model or optimize the load.
2. load mutation
   • phenomenonDuring the rolling process, there is a significant fluctuation in tension, resulting in material wrinkling or breakage.
   • solution：
     • Check the rigidity of the mechanical system (if the clearance between the guide roller bearings is greater than 0.1mm, high-precision bearings need to be replaced).
     • Adjust the parameters of the speed ring and tension ring (such as extending the acceleration time of the frequency converter to more than 1 second and enabling the S-shaped acceleration and deceleration curve).

6、 Maintenance and preventive measures

1. periodic calibrationCalibrate the sensor according to the manufacturer's recommended cycle (e.g. every 6 months) to ensure measurement accuracy.
2. Cleaning and maintenanceRegularly clean the surface dirt of the sensor to avoid affecting heat dissipation and signal transmission.
3. data recordingRecord historical sensor data and analyze trends to detect potential faults in advance.
4. Spare Parts ManagementReserve commonly used spare parts (such as sensors and couplings) to shorten the time for fault repair.