What are the common sensor failures and their solutions for brushless motor automatic skimmer?
Brushless motor automatic rewinding machine in operation, all kinds of sensors play a key role in detection and feedback, common sensor failures and solutions are as follows:
First, photoelectric sensor failure
1、Fault phenomenon: can not detect the material
Failure causes
Installation position deviation: photoelectric sensor installation position may change, so that the beam can not be accurately irradiated to the material, so as not to form an effective reflection or blocking signal.
Surface contamination: dust, oil, water vapor, etc. in the working environment will adhere to the transmitting and receiving ends of the sensor, weakening the light propagation and receiving strength, affecting the detection effect.
Sensor damage: prolonged use or external impact, high temperature and other factors, the internal components of the photoelectric sensor such as light-emitting diodes, photosensitive transistors, etc. may be damaged.
Power supply problem: unstable power supply voltage, poor contact or broken power supply line will cause the sensor can not work properly.
Solution.
Re-adjust the installation position to ensure that the sensor's beam can be accurately aligned with the path of the material passing through, and carry out several tests to verify.
Use a clean and soft cloth to wipe the surface of the sensor, if the oil is heavy, you can use the appropriate amount of detergent to clean, but be careful to avoid liquid into the sensor inside.
Use professional testing equipment to test the sensor, if it is determined that the internal components are damaged, timely replacement of the same type of sensor.
Check whether the power supply voltage is within the rated operating voltage of the sensor, check the power supply line to ensure that the connection is firm, repair the broken circuit problem.
2、Fault phenomenon: false detection
Failure causes
External light interference: strong light in the surrounding environment, such as sunlight, lighting, etc., may enter the detection area of the sensor, interfering with the normal light signal, resulting in misjudgment.
Background reflection: the surface of the objects around the receiver may reflect the light, so that the sensor mistakenly take the reflected light as the feedback signal of the material.
Improper sensitivity settings: the sensor's sensitivity is adjusted too high, which will make it over-sensitive to some small light changes, resulting in false detection; sensitivity settings are too low may not be able to detect the normal material.
Solution
Install a light shield or adjust the installation angle of the sensor to avoid the external strong light directly irradiated to the detection area of the sensor.
Adjust the installation position and angle of the sensor to avoid reflecting light from background objects into the detection range, or use a sensor with background suppression function.
Re-adjust the sensitivity of the sensor according to the actual detection needs, and find the appropriate parameters by experimenting with different sensitivity settings.
Second, the proximity sensor failure
1, fault phenomenon : no signal output
Failure causes
Inappropriate sensing distance: the distance between the detected object and the proximity sensor exceeds its effective sensing range, resulting in failure to produce a sensing signal.
Sensor damage: the internal electronic components, coils, etc. may be damaged due to aging, short circuit, circuit breakers and other reasons, losing the sensing function.
Connection line problem: The connection line between the sensor and controller is loose, broken or short-circuited, which will prevent the signal from being transmitted normally.
Solution
Adjust the distance between the detected object and the sensor so that it is within the effective sensing range of the sensor, and refer to the instructions of the sensor to determine the appropriate distance.
Use a multimeter or other tools to test the electrical performance of the sensor, if damage is found, replace the sensor with a new one in time.
Check the connection line, re-plug the loose connector, repair the broken or short circuit line.
2、Fault phenomenon: frequent false triggering
Fault causes
Metal interference: the proximity of the sensor near the presence of other metal objects, these metals will affect the sensor's magnetic field distribution, resulting in false triggering.
Vibration effects: the vibration generated during the operation of the receiver may cause small changes in the relative position between the detected object and the sensor, resulting in frequent triggering of the sensor.
Electromagnetic interference: Electromagnetic interference generated by surrounding electrical equipment may affect the normal operation of the proximity sensor, causing it to misjudge.
Solution.
Remove metal objects near the proximity sensor or adjust the installation position of the sensor to avoid metal interference.
Perform vibration-damping treatment on the receivers, such as installing vibration-damping pads, reinforcing equipment, etc., to reduce the impact of vibration on the sensors.
Electromagnetic shielding of the sensor, such as the use of metal shielding cover will be wrapped up the sensor, or the surrounding electrical equipment to take shielding measures.
Third, the pressure sensor failure
1, fault phenomenon: inaccurate measurement value
Failure causes
Zero drift: pressure sensors in long-term use, the zero point may drift, resulting in the measured value and the actual pressure value deviation.
Overload damage: If the pressure sensor is subjected to pressure exceeding its rated range, it may damage the internal pressure-sensitive components, affecting the measurement accuracy.
Medium influence: The characteristics of the measured medium, such as corrosiveness, viscosity, etc., may cause damage to the sensitive components of the sensor or form dirt on the sensor surface, affecting the measurement results.
Solution
Perform a zero calibration of the pressure sensor, following the sensor's instruction manual and using a standard pressure source for calibration.
Check the pressure system to ensure that the pressure is within the rated range of the sensor. If the sensor is damaged, replace it promptly.
According to the characteristics of the measured medium, select the appropriate pressure sensor, and take appropriate protective measures, such as the installation of filters, isolation film, etc., regular cleaning and maintenance of the sensor.
2、Fault phenomenon 2: no pressure signal output
Failure causes
Pressure interface blockage: the pressure medium can not normally enter the sensor pressure interface, resulting in the sensor can not feel the pressure change.
Internal circuit failure: the sensor's internal circuit may be broken, short-circuit and other problems, so that the signal can not be output normally.
Power supply problems: power supply failure or power supply line problems, resulting in the sensor can not work properly.
Solution
Check the pressure port, clear the blockage to ensure that the pressure medium can enter the sensor smoothly.
Use professional testing equipment to test the internal circuit of the sensor, if found faulty, repair or replace the sensor.
Check the power supply to ensure that the voltage is stable and the lines are connected properly.
※ If the above ways and means still can not solve the equipment failure, please contact Xinhui mechanical and electrical equipment through the page chat tool to seek help.
