1. The experience with the maintenance of the varianter described the recent repair of a mitsubishi a540-55k variant, which was brought to us by a new maintenance worker who had broken a module and changed it, trying to measure whether the drive was normal and dialed out the module trigger, and then jumped off the gate as soon as the power went off and found another module burned! It was possible that the trigger end of the igbt module would leave a small amount of voltage after the trigger line had been drawn, at a time when the module was semiconductive, when the power was burned on short circuits and the gtr module did not have this feature to test! We have a lot of mitsubishi a240-22k, all bad modules! The reason for this is poor maintenance, such as congestion in the radiator dust, dirty circuit boards, the failure of the dissipated silicate, etc
2. Modules (pm100csm120) are integrated modules, or the whole road will be replaced. Maintenance costs are high! Good modules are hard to find! The recent repair of an andgawa 616g5-55kw variant, which was badly damaged, used to be a fast-melted one (one of the three), the electrician might not have had experience, had not checked the module for problems and had not been able to find the fast-melting at once, replaced by a copper line, with a boom, two modules bursting, absorbing bad circuits, pushers unable to repair, new plates causing great damage! In our experience, most of the modules have problems if they're fast melting, but they don't break! We've seen it many times
3. We find that there are frequent connections to the a540-55 kw “n” line when the mitsubishi a240-55 kw variable is replaced with a540-55 kw! It's a big bang as soon as it's delivered! It's badly damaged! On the one hand, the "n" line of a540-5. 5kw is similar to that of the a240-5. 5kw variant! Some electricians connect the ground lines without seeing them clearly; others mistakenly think the "n" line is the ground line! Please connect the mitsubishi transfunctioner! A lot of people have called to ask how they measure the size of their currents in the same way
4. The electrical capacity of a module g-e or c-e is measured by the electrical capacity of a large current! Note that in the same module, an electrician called and said that he found over 1,000 volts in the output voltage of the mutator when he was testing it, asking if it was a frequency failure? Will the power burn? He still doesn't understand that a frequency transformer can only depress, not lift! Turns out he's using a digital universal meter, and since the voltage output is a high-frequency carrier, it's not easy to measure an average non-interference-proof digital chart here! This careless electrician didn't take the clips off when he was wired to the mitsubishi a540 sub-frequency, and it didn't make sense when he burned it
R and r1, t and t1 are linked, and the electrician thought that the two lines drawn from r and t were not different, and as a result, r was delivered to s1, t to r1, creating a short path between them, as r and r, t and t1 were connected through the middle of the power plate, which resulted in the burning of the power panel and the blasting of two layers! In general, there is no need for auxiliary power supply (r1, t1)! Some maintenance starters don't know how to use false loads when they're repairing a frequency transformer, say they're of poor quality when the driver fails and the module burns down! Fake loads are wired with a few hundred euros of electric resistance, which is taken off the main road if it melts quickly and is fitted with electrical resistance; if it does not melt, it can be cut off anywhere on the lord's return and tied with this barrier! It's a barrier that doesn't burn down when there's a short circuit
Many plants are powered by generators, and when the generators fail, the output of high voltage power destroys both the transmission and the electronics! We've seen this all the time. Last year, in shenzhen, a raz plant destroyed more than 20 30 kw variants and cut production for more than 10 days, causing significant losses. The plant has done a lot of protection in generators. Then we thought of a passive protection method by adding pressure-sensitive resistance to the air switch at the input end of the frequency transformer or instrument (880v with 821k, 220v471k), so that when there is high voltage, the pressure-sensitive is short, the air switch is off, the frequency is protected, the rate of frequency failure is significantly reduced, and the pressure-sensitive barrier is cheap
7. The number of pressure-sensitive resisters associated (triangularly triangulated) is not strictly required, and the amount of pressure-sensitive resistors selected to enter large currents is relatively larger (or several combinations)! It's completely short-circuit when pressure-sensitive resistance works! It also requires that your air switch be of good quality and speed. Of course it's the output end of the air switch! Some of the friends who called today, and when it comes to pressure-sensitive electrical resistance, asked about some of the end-of-fossors that also have pressure-sensitive electrical resistance, which should also be protected! But according to the reality of the frequency transformers that we've repaired, only the copper wire of the circuit board is burned, the current module is burned, the power is turned on, the cpu plate is plated, the face of the battery can be seriously injured by the fact that its metal fragments were flying around when the pressure-sensitive electrical resistance short circuit exploded; when it exploded, it was powerful
Gyrostatic and electromagnetic waves (like thunderstorms); the burning of copper wires on circuit boards renders the air switch inactive. So a lot of pressure-sensitive resistance outside the frequency transformer! An electrician at a knitting plant in shunde was awarded $2,000 because he was inspired to save a lot of electrical panels with pressure-sensitive electric resistance! There is no need for this, as in the case of module 7 mbr25nf-120, which is the same parameter as 7 mbr25ne-120, with only four additional locator feet! Since the igbt module is driven by voltage control and has a better interchangeability, many igbt modules of different types are interchangeable as long as they are resistant to voltage and current parameters! Some installations
Nine, different sizes, other holes! The gtr module also needs to consider its magnification multiplier, which is less interchangeable! How can we buy a module that is expensive to repair? First of all, you have to see if the modules have been removed, and now there are a lot of them that have been repaired, and the parameters are normal but of poor quality! Resisting values are the most important parameter and can be measured by a pressure-resisting meter, with output modules of 380 v having a resistance value greater than 1,000 v and 220 v having 600 v. The current can be compared with the capacity table to determine size! The igbt module can also test the movement with a pointer type of table 10k to trigger g-e of the module with a pointer (black-red)
It's the simplest and most basic method of measuring, which can be done by freshmen. A lot of people are repairing the changer module, which is broken in a few days. Looks like it's a small thing, but it's deadly for a frequency transformer! We found that a number of transformers, when installed on vibrating equipment (e. G. Industrial washing machines, machine beds, etc.) for a certain period of time, eased the connection screws of their main circuit and the tight screws of their modules, at a time when the first damage was typically to the modules, and if the modules were replaced without other screws, the modules would soon be broken and the quality of the modules would be poor
11, with a special emphasis on not placing it on a vibrating device, otherwise the good ones could be broken soon! We often see maintenance masters who are too confident, who don't have to falsify their loads, who find it too difficult to burn the module! If you use a false load, you can almost be sure! Unless you buy a fake module!! - - - - - - - - - - - - - - international electrical network - professional online electrician market, q: 3035207705-9-7 10:27,123
12 articles: 468 points: 3678 register: 2005-2-26, 2nd floor many people are confused about the structure of the fux g9-5. 5 kw flow module cvm40cd120, which is briefly described here: wholestream: r, s, t, a(+), n-(-) chargeable silicon: a, p1, gth (trigger) brake tubes: db, n-, g7 (trigger); db, b+ is its continuous diode switch: d8, s8, g8 thermally resistant: th1, th2
13 the shanken mf series has a general disease, i. E., sometimes displays “erc” malfunctions, at which time the following can be done: open parameter 90, write “7831”, at which time the variable displays “pass”, write “frequency transformer capacity” and restore parameters to the plant value (parameter 36 = 1)! Frequency changer capacity: 2. 2 kw - 23 3. 7 kw-24 7. 5 kw-26 15 kw-28 22 kw-30 30 kw-31 45 kw-33 75 kw-35 110 kw-37 other power hypothesis! Some people, in order to improve the rectangulars of the electrics, often adjust the rectangular parameters (or the lowest output voltage) of the transformer
14 to high! This is a very large starter. It's a lot of "overflow" and it's easy to damage the module! The rectangular upgrade should be appropriate, allowing for a gradual upturning and current-size observation, with the best "vector control" for the load load, at which point the mutator will automatically export the maximum rectangular, and the mutator will perform "modernization" (self-learning), but there are not many real mutators! Even less, the basic frequency cannot be lowered. The basic frequency of the domestic electrical design is 50hz, and when the basic frequency of the transformer is reduced, although it increases the rectangular frequency, the current is soaring that it can cause damage to both the transformer and the generator! Can't even fix it! Especially for a few brands that don't have a breaker in the frequency. The current of the breaker can't be too big
15. A common problem with the f9 g9-kw-7. 5-kw is that it has a high dispersing fan power, a high rate of turn-off, and a shorter life in a dusty working environment. When a fan is broken, it does not jump overheat protection (possibly too high protection temperature setting), at which point the overall internal temperature of the transformer is high, making the small electrical capacity to drive and power circuits susceptible to ageing, usually when the switch is the first to stop working! It's time to replace the two small caps of the fans and power circuits and restore the frequency! It's better to also change the caps of the motor circuit
We think it's very important for you to be able to use the frequency when it's running properly; when your equipment is sold far away; when you don't want trouble with mechanics! But not all of them are for you! Some of the brand-name transvestites are so delicate that they need a good environment for quality! If you have a smoother power, less heavy parking, light loads, steady power voltage, a good working environment for the frequency transformer, failure to work, a two-year break in the new machine and proximity to the maintenance service, in order to save money, you might consider buying a low-priced, well-known variable! The frequency is often bad, when the speed is too high, the electric power is high, the performance of the high frequency is self-restricted, the acceleration time is prolonged, and the low performance of the low frequency is reduced by the high power! The acceleration time is best not less than two seconds. When slowing down too fast, the transformer is subject to an electric counter-power shock and the module is vulnerable to damage! It's best to use the brake unit if the power is to shut down, or to extend the speed reduction or to introduce freedom
