Series Induction Furnace Maintenance
1. Static data first, then dynamics
The so-called static data inspection is the inspection carried out before the series induction furnace is not plugged in. When it is confirmed that the static data check is correct, it can be plugged in for the dynamic check. If abnormal phenomena such as smoke and flickering are found, it should be turned on standby quickly, and the static data check should be carried out again. This can avoid energizing the series one-to-two intermediate frequency furnace when the situation is unclear, causing unnecessary damage.
As far as the precision measuring instrument equipment used in the current maintenance is concerned, only the function test and static data status analysis of the components on the circuit board can be carried out. Whether the faulty circuit board is finally completely repaired must be reinstalled on the original circuit Only detection will do. In order to obtain correct results in this testing process and to judge whether the circuit board with the replaced electrical components is in good condition, first check whether the auxiliary power supply of the series-connected one-to-two intermediate frequency furnace is properly supplied to the relevant circuit as required Check the board, and whether the sockets on the circuit board are properly plugged in. And it is necessary to eliminate the damage caused by the external circuit failure of the circuit board, so as to correctly guide the maintenance work.
2. Clean up first, then overhaul
For the series-connected one-to-two induction furnaces that are seriously polluted, it is necessary to clean the panel keys, wiring terminals, and contact surfaces first, and check whether the external keys are invalid. When checking the internal structure of the series-connected one-to-two intermediate frequency furnace, you should mainly check whether the internal structure of the series-connected one-to-two intermediate frequency furnace is cleaned. Or unnecessary solder wire, solder oil, etc., should be removed first, and then repaired, so that natural failures can be reduced, and the effect of getting twice the result with half the effort can be obtained. Practice has shown that many faults are caused by dirt, dust, and dirt, and the faults usually disappear once they are cleaned or eliminated.
3. Switch the power supply circuit first, then act on the circuit
The power supply is the heart of one drive two intermediate frequency furnaces in series. If the power supply is abnormal, it will not be able to ensure the normal work of other parts, and it will be difficult to check other faults. According to work experience, the failure rate of switching power supply accounts for the proportion of the whole. Many failures are usually caused by switching power supply. Therefore, repairing the switching power supply circuit first can often get twice the result with half the effort. When the furnace is overhauled, it is necessary to first repair the power part of the main circuit, the part of the control power supply, then the part of the control circuit, the part of the open circuit, and finally the sequence of the display part. This is because when switching on and off the power supply, each part of the one-to-two intermediate frequency furnace in series can be the energy source for normal operation, and the control circuit is the basis for normal operation.
4. Broad first, then unique
In the absence of a clear understanding of the fault location of the series-connected one-to-two induction furnace, do not blindly adjust some adjustable electronic devices in the series-connected one-to-two intermediate frequency furnace, so as not to complicate the fault artificially. When the internal circuit breaker is blown or the power resistor and other maintenance circuit electronic components are hit or damaged, first carefully check whether there is any problem with the surrounding circuit, and then replace it to repair the power distribution after confirming that there is no problem. . The failures caused by the product quality of electronic devices or external reasons generally account for 50% of common failures. The unique failures of one-to-two intermediate frequency furnaces in series are mostly soft failures, which need to be accurately measured and repaired by work experience and instrumentation equipment. According to the same characteristics of the series-connected one-to-two intermediate frequency furnace, first eliminate objective and periodic common faults, and then check the special circuit (including some special electronic devices). It is convenient to gradually reduce the fault range, from surface to point, so as to achieve the effect of shortening the maintenance time.
5. External first, then replace
After identifying the damaged components, do not rush to replace them, and consider replacing the damaged electrical components after confirming that the external circuit is normal. When checking the integrated circuit, when the working voltage of each pin of the integrated circuit is abnormal, it is not necessary to urgently replace the integrated circuit, but check its external circuit first, and then consider replacing the integrated circuit after confirming that the external circuit is normal. circuit. If you don’t check the external circuit, blindly replace the integrated circuit, it will only cause unnecessary damage, and the current integrated circuit has more pins, and it will be damaged if you don’t pay attention. It is known from the maintenance practice that the failure rate of the external circuit of the integrated circuit is much higher than that of the integrated circuit.
6. Clear the fault first, then adjust it
In maintenance, the circuit fault should be eliminated first, and then adjusted. Because the adjustment must be carried out under the normal condition of the circuit. Naturally, there are also some failures caused by unreasonable adjustments. At this time, it can be recovered by adjusting immediately. When replacing electronic components, we must pay attention to the welding quality, so as not to cause desoldering. In addition, the electric welding time should not be too long, so as not to damage the electronic components and cause unnecessary property loss. Soldering electrical equipment and electronic components many times can easily cause copper mottle to fall off the circuit board. After the replacement of electronic components, the dirty things in the series-connected one-to-two intermediate frequency furnace should be cleaned up on time, and the connections and connectors should be checked again and installed in time to prevent other human-induced failures.
7. DC first, then communication
During maintenance, the inspection of the electronic circuit must first check the static working point of the DC circuit, and then check the dynamic working point of the AC circuit. The direct current and alternating current here refer to the direct current circuit and the alternating current circuit of each electronic circuit. These two circuits are closely related, and only when the DC circuit is normal, the AC circuit can work normally.
8. Accurate measurement without plugging in first, then plugged in for detection
First, do a static data check on the one-to-two series induction furnace without plugging in the power. If everything is normal, then perform a dynamic inspection on the series-connected one-to-two series induction furnace with power on. If you plug in the power immediately, it is likely to artificially expand the scope of the fault, damage a large number of electronic devices, and cause undue damage. Therefore, before plugging in the faulty series-connected one-to-two intermediate frequency furnace, a static data inspection must be carried out, and the plug-in inspection can be performed when the static state is normal.
9. Use the same circuit first, then the module circuit
If the common-use circuit of one drive of two intermediate frequency furnaces in series fails, its kinetic energy and information cannot be transmitted, which reduces the function of each module circuit and loses its function. If the power supply of a series-connected one-to-two intermediate frequency furnace fails, the entire system will not be able to run normally, and the energy and information transmitted to various modular circuits will not be completed. Therefore, in the maintenance, the order of the common circuit first and then the module circuit should be followed, so as to quickly and accurately eliminate the faults of the series-connected one-to-two intermediate frequency furnace. the
The failures of one-to-two series induction furnaces are mainly manifested in diversity. After repairing all faulty one-to-two series induction furnaces, the failure status, reason, maintenance process, method, and experience should be recorded in a special book. Accumulate maintenance work experience, and then increase your own work experience L as the basic theory. Under the theoretical innovation, ensure the in-depth analysis of actual faults, so that faults can be eliminated accurately and quickly. Only in this way can we shape ourselves into an expert in repairing the faults of series-connected one-drag-two intermediate frequency furnaces.
