According to the statistical analysis of the frequency and shutdown time of the specific common problems of the inverter, the repair rate of the main power supply circuit accounts for more than 60%; The main operating parameters are set improperly, resulting in about 20% of common problems; 15% of the common problems of manipulating circuit boards; 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 treatment, the occurrence of such common problems will inevitably lead to the destruction and damage of electronic equipment. This is a key part of the inverter's cost of protection.
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 use 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 that acts as the output of all electromagnetic energy from the inverter is simply overheated and penetrated. 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 removing and replacing the rectifier, it is necessary to evenly coat the surface of the radiator with a 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, the fixing screw holes must be punched and tapped 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 well closed, the current-carrying time is too long, and the battery charging resistor is burned out; or the resistance burns out due to excessive current; Or because of the light load start, the main control circuit is connected to the power supply, and the RUN data signal is connected separately, so the battery charging resistor is simply incinerated 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 devices with different capacities, the resistance values are different, you can refer to the same type of resistance values)
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