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How to maintain the fan speed control system in the laminar flow hood?
How to maintain the fan speed control system in the laminar flow hood?The maintenance of the fan speed regulation system in the laminar flow hood is very important. The following are some specific maintenance measures:First, regular cleaning External cleaning The outside of the fan speed control system, such as the frequency converter and the shell of the speed control motor, will accumulate dust. Periodically (at least once a week) wipe the cover with a clean, soft, damp cloth to prevent dust from entering the device and affecting heat dissipation and electrical performance. For laminar flow hoods installed in harsh industrial environments, such as near workshops where processing equipment produces a large amount of dust, the cleaning frequency should be appropriately increased. When cleaning, care should be taken to avoid moisture entering the electrical interfaces and vents. For interfaces and vents with protective covers, you can remove the protective covers and clean them before installing them back to ensure that they are well sealed. Internal cleaning (careful operation) For equipment such as frequency converters, internal cleaning needs to be carried out by professionals in the case of power failure. Generally, every six months or a year to carry out an internal cleaning, mainly to clean the dust on the circuit board. A small vacuum cleaner or compressed air tank can be used to remove dust from the surface of the circuit board and electronic components. When using the compressed air tank, it is necessary to maintain an appropriate distance to avoid excessive pressure damage to electronic components. Second, check the electrical connection. Check connection tightness Periodically (once a month) check the electrical connections of the fan speed control system, including the connections between power cables, signal cables, frequency converters, and motors. Make sure the connection screws are not loose, as loose connections may result in poor contact, heat generation, and even electrical failure. During the inspection process, you can use a suitable tool, such as a torque wrench, to tighten the screws according to the requirements of the equipment. For the connection of the plug and socket, check whether the plug is tightly inserted and whether the reed in the socket is deformed or oxidized. If the reed is found to be oxidized, you can use a special electronic cleaner to clean it, and then insert the plug into the socket to ensure that the connection is good. Line integrity check Check whether the insulation layer of the electrical circuit is damaged or aging. Especially in the parts that often move or are vulnerable to mechanical damage, such as the power cord near the fan motor, it is necessary to focus on inspection. If the insulation layer is found to be damaged, replace the line in time to avoid short-circuit accidents. At the same time, check whether the identification of the line is clear, for complex wiring systems, clear line identification helps to quickly locate during maintenance and troubleshooting. Third, heat dissipation system maintenance Radiator cleaning The frequency converter and speed-regulating motor will generate heat during operation, which needs to be dissipated by the radiator. Clean dust and debris from the surface of the radiator regularly (every three months or so) to ensure that the heat sink is not blocked between the fins. You can use a brush to gently brush away dust, for difficult-to-clean stains, you can use a small amount of detergent and water to clean, and then dry with a clean cloth. Check that the radiator fan (if any) is working properly. The speed and wind direction of the fan affects the heat dissipation effect. If the fan is abnormal, for example, the fan speed is slow or abnormal noise is generated, replace the fan in time. Temperature monitoring device check Some fan speed control systems are equipped with temperature monitoring devices for real-time monitoring of the temperature of the equipment. Periodically check whether these temperature monitoring devices are working properly, for example, by simulating a temperature rise, check whether the temperature sensor can accurately feed the temperature signal back to the control system and whether the control system can take appropriate protective measures based on the temperature signal, such as reducing the fan speed or issuing an alarm signal. Fourth, functional testing and calibration Speed control function test The speed control function of the fan speed control system is tested regularly (once a quarter). You can set the fan speed to different predetermined values by operating the control system, and then use a tool such as a tachometer to measure the actual fan speed and check whether the actual speed is consistent with the set speed. If the speed deviation is large, you may need to calibrate the speed control system. In the detection process, observe the operating state of the fan in the speed regulation process, such as whether there is abnormal vibration, noise, and so on. Abnormal vibration may be caused by an unbalance of the motor, loose of the fan impeller, and other reasons, and it needs to be investigated and treated in time. Calibration and parameter adjustment According to the test result, you can calibrate the speed adjustment according to the device operation manual. For the inverter speed control system, it may be necessary to adjust some internal parameters, such as proportional gain, integral time, differential time, and other parameters to optimize the speed control performance. For speed-regulating motors, it may be necessary to adjust the parameters of the motor controller, such as the calibration of magnetic field strength, armature voltage, and other parameters, to ensure that the fan can accurately speed. 5. Parts replacement and upgrade Replacement of vulnerable parts Some parts of the fan speed control system are vulnerable parts, such as the filter capacitor of the inverter, and the brush of the speed control motor (for the brush motor). Replace these vulnerable parts in time according to the service life and operation of the equipment. For example, the filter capacitor generally has a service life of about 3-5 years, and when it is close to its service life, the replacement capacitor should be prepared in advance to avoid capacitor failure affecting the performance of the inverter. For brushed motors, brush wear to a certain extent will affect the performance of the motor, should be regularly checked the length of the brush, and when the length of the brush is less than the specified value, timely replacement of the brush. System upgrade With the development of technology, the fan speed control system may need to be upgraded. For example, the old analog control frequency converter is upgraded to a digital communication control frequency converter to improve control accuracy and flexibility. During the upgrade process, back up the parameter Settings of the original device to ensure that the upgraded system is compatible with other components of the laminar hood and is put into use after rigorous testing. |
