Since it is an "illness born out of heat", then let us follow this heat dissipation line and peel it layer-by-layer like an onion to check down.
1. The electrical cabinet became a "big steamer"
In many factories, the electrical cabinet is sealed. The inverter and a pile of reactors and braking resistors are squeezed together, and everyone is desperately generating heat. If the ventilation fan on the electrical cabinet is broken, or the air inlet filter screen is death-muddled by oil sludge and dust, the outside cold air cannot come in, and the inside hot air cannot go out.
At this time, what the inverter sucks in is entirely the hundred-degree hot air inside the cabinet, how is it possible for it to dissipate heat?
Old hand practical operation one trick: when encountering the error, throw open the door of the electrical cabinet, and take a household large floor fan to blow fiercely against the inverter. If this way it doesn't report the error anymore, then one hundred percent the cabinet's heat dissipation design is no good, or the cabinet top fan is time to be changed.
2. The cooling fan "strikes" or "cannot turn anymore"
The cooling fan at the bottom or top of the inverter is a consumer item in name and reality. After using for two or three years, the grease inside the bearing dries up, or gets jammed by burrs and dust, and the fan will spin very slowly, or even directly jam dead.
There are even more hilarious situations: the fan wiring is connected reverse, and the wind blows in the opposite direction; or you bought a low-quality replacement fan, and the wind volume basically cannot reach Siemens' original factory requirements.
How to check? When the inverter is running, use a thin piece of paper to stick on the air outlet, and see if the paper can be powerfully blown up. Listen to whether the fan has "clack-clack" abnormal noises. For those with insufficient speed or not spinning, directly change to new.
3. The heat sink grew a "thick woolen blanket"
In some workshops (such as cement plants, textile mills, rubber and plastic plants, metal processing plants), the air is full of dust, cotton lint, or oil mist. The inverter fan draws air inside every day, and after a long time, inside those dense aluminum gaps of the heat sink, it will be stuffed full of dirty things, just like covering the heat sink with a thick layer of insulation woolen blanket.
The heat is completely smothered inside, and the heat dissipation efficiency slides straight down.
Solution: tear down the inverter, or after powering off, use dry compressed air (be careful not to carry water) to blow fiercely against the heat dissipation grids. Believe me, the dust sprayed out can make you doubt life. After blowing clean, the temperature is guaranteed to drop by more than ten degrees.
4. The machine was "tired to smoking"
If the mechanical equipment ages, the bearing lacks oil and the friction force becomes big, or the production line operates with overload, the motor is testing crazily on the edge of overload every day.
The motor eats big strength, the current output by the inverter is big, and the heat generated by the IGBT naturally increases by double. At this time, even if your fan is good, the speed of heat generation is far greater than the speed of dissipation, and it will likewise stuff out an F30004. At this time you have to check if the mechanical end is jammed, or appropriately reduce the load a bit and stretch the acceleration time a bit longer, don't let the current soar too fiercely in an instant.
If you made the cabinet as cool as an air-conditioned room, the fan is spinning flyingly, the heat sink is washed like new, and the equipment is not overloaded, but once starting the machine and running for a few minutes it still thunder-immovably trips F30004, then you have to consider hardware problems:
1. The temperature sensor (NTC/PTC) is aged or broken: the sensor itself fell sick, originally the heat sink is only 40°C, but it stubbornly reports a 110°C false data to the motherboard.
2. The temperature detection circuit is broken: the sampling resistor or operational amplifier on the drive board is burned, causing the read-out voltage signal to distort.
3. The thermal conductive silicone grease dried up and failed: between the IGBT and the aluminum heat sink, it relies on thermal conductive silicone grease to transmit heat. After using for long (such as seven or eight years or more), the silicone grease becomes a dry hard shell, the heat cannot transmit over, the IGBT is hot to death, while the heat sink might still be cool.
