According to the statistical analysis of the frequency and shutdown time of the inverter's detailed common problems, the correction rate of the main power supply circuit accounts for more than 60%; The main operating parameters are not set properly, resulting in about 20% of common problems; Common problems with control circuit boards account for 15%; 5% of common problems are caused by incorrect operations and external exceptions. According to the statistical analysis of the level of common problems and the difficulty of dealing with them, the occurrence of such common problems will inevitably lead to the destruction and damage of electronic equipment. This is a key part of the maintenance cost of the inverter.
What to do if you have a problem with the main circuit
(1) Damage to the rectifier block, damage to the rectifier tube is also one of the common problems of the inverter. The rectifier block of the inverter made in the early days was mainly a diode rectifier. At this stage, some rectifier blocks utilize the thyristor rectifier method (variable voltage radio broadcast frequency converter). Generally, the rectifier module of medium and high power inverters is a three-phase full-wave rectifier. The rectifier, which is responsible for all the electromagnetic energy output from the inverter, is simply overheating and penetrating. After damage, the inverter will not be connected, the commercial insurance will be interrupted, the three-phase input or output terminals will show low resistance values (when everything is normal, the resistance value is higher than megaohms) or short circuits. When disassembling and replacing the rectifier block, it is necessary to evenly coat the surface of the radiator with a uniform layer of silicon thermal paste with excellent thermal conductivity, and then tighten the screws. If the same rectifier block is not available, it can be replaced by another type of rectifier block with the same volume. Before installation and wiring, it is necessary to punch and tap the fixing screw holes again. For example, in the mid-to-late 80s of the 20th century, after the inverter (7.5kVA) rectifier module (elliptical type) made by Siemens PLC was penetrated, because there were no similar rectifier block parts, the rectifier block (rectangular structure) of the same volume made by Sanken was selected for replacement. It has been in operation for many years and is still functioning at this stage.
(2) The battery charging resistor of the inverter is simply damaged for the following reasons: if the communication contactor of the main control circuit is not closed well, the current-carrying time is too long, and the battery charging resistor is burned out; or the resistance burns out due to excessive current; Perhaps because the light load is started, the main control circuit is connected to the power supply, and the RUN data signal is connected independently, so the battery charging resistor is simply burned according to the current and the load inverter current. Its damage is generally characterized by damage, blackening of the shell, cracking, and other signs of damage. It is also possible to measure the resistance according to the multimeter (for equipment with different capacities, the resistance value is different, and the resistance value of the same model can be referenced)
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