Energy feedback device suppliers remind you that frequency converters are increasingly used in industrial control production. This is an electrical equipment that uses a variant circuit to convert a 50HZ power supply into an AC power supply with adjustable frequency and voltage, in order to drive three-phase AC asynchronous motors. As a frequency converter composed of microelectronics technology and power electronics modules, its electrical performance is greatly affected by environmental temperature, air humidity, mechanical vibration, dust, and corrosive gases in practical applications.
Long term failure to maintain the frequency converter can lead to a decrease in operational efficiency and safety. Especially dust and humid air, if not removed in a timely manner, can cause severe heating of the inverter and internal electronic components, leading to malfunction or shortened service life of the inverter. Therefore, it is necessary to carry out daily and regular maintenance on the frequency converter.
Daily inspection items for frequency converter:
(1) Whether there are any abnormal changes in the sound during the operation of the motor, including whether there is vibration during the operation of the motor.
(2) Has there been any change in the installation environment of the frequency converter. Regardless of whether the ambient temperature is normal or not, the working temperature of the frequency converter is generally within the range of -10 ℃ to+40 ℃, preferably around 25 ℃.
(3) Whether the cooling fan of the frequency converter is working properly, including whether the cooling channel of the frequency converter is unobstructed. Is the output data of current, voltage, frequency, etc. displayed on the display panel of the frequency converter normal. Whether the characters on the display panel are clear and whether the strokes are missing.
(4) Is the frequency converter overheating. Infrared thermometer can be used to detect whether the heat sink of the frequency converter is overheated or has an odor. Check if there are any fault alarm displays during the operation of the frequency converter.
(5) Regularly clean the filter screen of the air inlet duct inside the electrical control cabinet. Always keep the control cabinet and frequency converter in good clean condition. Effectively remove surface dust from the frequency converter to prevent accumulated dust from entering the frequency converter. Especially metal dust. Effectively remove oil stains from the cooling fan of the frequency converter.
(6) Use the annual maintenance schedule to turn on the frequency converter and focus on cleaning the internal parts that are not visible during normal daily operations. Clean the circuit board of the frequency converter and its internal rectifier module, IGBT module, DC filter electrolytic capacitor, input/output reactor, etc. Use a brush or vacuum cleaner. Replace unqualified electronic components (note: the internal filtering capacitor of the frequency converter generally needs to be replaced every 4-5 years).
(7) Check the cooling fan: As the cooling fan requires long-term continuous operation, it is a component that is prone to damage. Its lifespan is limited by the bearings (it is an axial fan). According to the frequency converter, fans or fan bearings are usually replaced every 2-3 years.