What are the key points of frequency converter maintenance?
Frequency converter routine maintenance and repair workDo a good job of frequency converter routine maintenance and repair work, including:(1) regular (three months) of dust on the inverter, the focus is the electrical control cabinet, inverter inverter main base, terminal block, inverter air inlet and outlet is dust or because of too much dust and jam. Frequency converter because of its cooling requirements, ventilation volume, so after running a certain period of time, the surface dust is very serious, must be regularly cleaning dust.(2) to drive the front door open, carefully check the AC and DC bus has no deformation, corrosion, oxidation, busbar connection screws are loose, the fixed point solid screws are loose, fixed with insulating piece or insulation column aging or cracking deformation, such as a replacement, and when fastening, on bus has been deformed to be re installed after correction.
Selection of frequency converter and installation noticeType selection of frequency converter in general should pay attention to the matters (such as input supply voltage, frequency, output power, load characteristics and so on), also requires a good match with the corresponding motor requirements during normal operation, giving full play to the advantage of energy saving at the same time, to avoid the overload operation, and try to avoid dragging equipment such as pumps the inefficient work area, to ensure the efficient and reliable operation.The installation environment of inverter must try to be clean and dust, and has good ventilation environment, ventilation conditions can be considered the side wall at the bottom of the inlet exhaust, and the inverter is installed, the top and side shall be sufficient for the minimum cooling distance, inverter inverter heat dissipation, in addition, there are certain requirements the environmental humidity, high humidity, electrical insulation to reduce the inverter itself, bar metal parts easy to corrosion, and the humidity is too low and easy to cause insulation damage, generally keep the humidity between 40%-90%.
Frequency converter daily patrolDo the inverter daily inspection and inspection work, inspection contents mainly include: ambient temperature, humidity is required, ventilation windows is good; the inverter air inlet and outlet is blocked by dust or too much dust; inverter operation parameter is normal, there is no alarm; cabinet fan the operation is normal; if there is abnormal sound or vibration transducer; capacitor whether overheat.
(brief introduction of main circuit of frequency converter)The main circuit of the inverter is composed of four parts: input, rectification, filtering and inverting. The three-phase alternating current is converted into DC through rectification and filtering, and then is converted into three-phase alternating current with arbitrary frequency and voltage. Middle DC link capacitor, due to the large capacitance, DC voltage of the main circuit is relatively stable, the resistance is very small, with the characteristic of the voltage source, a voltage type inverter in the speed control system of asynchronous motor, because the motor is inductive, capacitive reactive power at the same time as a buffer storage component.
1., regular cleaningAlways check the frequency converter regularly and keep the environment clean and dry. It is strictly prohibited to place sundries near the frequency converter, and someone should regularly clean the frequency converter, blow it out, keep the cleanliness of the converter and the ventilation of the air duct.2. treatment methodsIf it is found within the inverter or radiator plate dust and debris falling into, should promptly use compressed air to blow off. Clean air filter, cooling air duct and interior dust. When it is found that the conductor and insulator have corrosion, it should be promptly cleaned with alcohol.For continuously running inverters, the running state can be visually checked from outside. Periodically inspect the converter and check if there is any abnormality when the converter is running. The following tests should normally be carried out:
