中频感应熔化炉重点维修九大方法（针对一电两炉中频感应熔化炉有效）

就目前维修中所采用的测量仪器仪表而言，只能对电路板上的元器件进行功能在线测试和静态特征分析，发生故障的电路板是否最终完全修复好，必须要装回原电路上检验才行。为使这种检验过程取得正确结果，以判断更换了电气电子元器件的电路板是否修理好，最好先检查一下一电两炉中频感应熔化炉的辅助电源是否按要求正确供给到相关电路板上，以及电路板上的各接口插件是否可靠插好。并要排除电路板外围电路故障带来的影响，才能正确地指导维修工作。

2、先清洁，后维修

对污染较重的一电两炉中频感应熔化炉，先要对其面板按键、接线端、接触点进行清洁，检查外部控制键是否失灵。检查一电两炉中频感应熔化炉内部时，应着重看一电两炉中频感应熔化炉内部是否清洁，如果发现一电两炉中频感应熔化炉内各组件、引线、走线之间有尘土、污物、蛛网或多余焊锡、焊油等，应先加以清除，再进行检修，这样既可减少自然故障，又可取得事半功倍的效果。实践表明，许多故障都是由于脏污、灰尘、异物引起的，一经清洁或清除故障往往会自动消失。

3、先电源电路，后功能电路

电源是一电两炉中频感应熔化炉的心脏，如果电源不正常，就不可能保证其他部分的正常工作，也就无从检查别的故障。根据经验，电源部分的故障率在整机中占的比例最高，许多故障往往就是由电源引起的，所以先检修电源电路常能收到事半功倍的效果，一电两炉中频感应熔化炉的维修时应按照先检修主电路电源部分、控制电源部分，再检修控制电路、触发电路部分，最后是显示部分的顺序。这是因为电源时一电两炉中频感应熔化炉各部分能正常工作的能量之源，而控制电路又是能正常工作的基础。

4、先普遍，后特殊

在没有了解清楚一电两炉中频感应熔化炉故障部位的情况下，不要对一电两炉中频感应熔化炉内的一些可调元器件进行盲目的调整，以免人为地将故障复杂化。遇到机内熔断器熔断或限流电阻等保护电路元器件被击或烧毁时，要先认真检查一下其周围电路是否有问题，在确认没问题后，再将其更换恢复供电。因元器件的质量或外部因素而引起的故障，一般占常见故障的50%，一电两炉中频感应熔化炉的特殊故障多为软故障，要靠经验和仪器仪表来测量和维修。根据一电两炉中频感应熔化炉的共同特点，先排除带有普遍性和规律性的常见故障，然后再去检查特殊的电路（包括一些特殊的元器件）．以便逐步缩小故障范围，由面到点，以达到缩短维修时间的效果。

5、先外围，后更换

在确定损坏的元器件后，先不要急于更换，在确认外围设备电路正常后再考虑更换损坏的电气元器件。在检查集成电路时，当集成电路各引脚电压有异常时，不要急于更换集成电路，而应先检查其外围电路，在确认外围电路正常后再考虑更换集成电路。若不检查外围电路，一味更换集成电路，只能造成不必要的损失，且现在的集成电路引脚较多，稍不注意便会损坏。从维修实践可知，集成电路外围电路的故障率远高于集成电路。

6、先排除故障，后进行调试

在检修中应当先排除电路故障，然后再进行调试。因为调试必须是在电路正常的前提下才能进行。当然也有些故障是由于调试不当造成的，这时只需直接调试即可恢复正常。在更换元器件时一定要注意焊接质量，不要造成虚焊。另外，焊接时间也不宜过长，以免损坏元器件，造成不必要的经济损失。多次焊接电气电子元器件容易造成铜箔从电路板上脱落。更换元器件后，一电两炉中频感应熔化炉内的异物要及时清理干净，连线和插接件要重新检查一遍，并安装到位，以免造成另外的人为故障。

7、先直流，后交流

检修时，对于电子电路的检查必须先检测直流回路静态工作点，再检测交流回路动态工作点。这里的直流和交流是指电子电路各级的直流回路和交流回路。这两个回路是相辅相成的，只有在直流回路正常的前提下，交流回路才能正常工作。

9、先不通电测量，后通电测试

首先在不通电的情况下对一电两炉中频感应熔化炉进行静态检查，若正常，则再在通电的情况下对一电两炉中频感应熔化炉进行动态检查。若立即通电，可能会人为地扩大故障范围，烧毁更多的元器件，造成不应有的损失。因此，在故障一电两炉中频感应熔化炉通电前，必须进行静态检查，在静态正常的情况下方可通电检测。

9、先共用电路，后单元电路

一电两炉中频感应熔化炉的共用电路出故障，其能量、信息就无法传送，使各单元电路的性能下降、功能丧失。如一台一电两炉中频感应熔化炉的电源出现故障，整个系统就无法正常运转，向各种单元电路传递的能量、信息就不可能实现。因此，在检修中应遵循先共用电路，后单元电路的顺序，-能快速、准确地排除一电两炉中频感应熔化炉的故障。

一电两炉中频感应熔化炉出现故障表现为多样性，任何一台有故障的一电两炉中频感应熔化炉检修完，应该把故障现象、原因、检修经过、技巧、心得记录在专用的笔记本上，以积累维修经验，并要将自己的经验L上升为理论在理论指导下，做到具体故障具体分析，才能准确、迅速地排除故障。只有这样才能把自己培养成为检修一电两炉中频感应熔化炉故障的行家里手。

Nine major methods for medium frequency induction melting furnace

(effective for one electric two-furnace medium frequency induction melting furnace )

1 , first static, then dynamic

The so-called static inspection is an inspection performed before the electric induction furnace of an electric two-furnace is not energized. When the static check is confirmed to be correct, the power can be energized for dynamic inspection. If abnormal conditions such as smoke or flicker are found, you should turn off the machine quickly and perform a static check again. This can avoid powering an electric two-furnace intermediate frequency induction melting furnace when the situation is unknown , causing undue damage.

As far as the measurement instruments used in the current maintenance are concerned, only functional online testing and static characteristic analysis can be performed on the components on the circuit board. If the faulty circuit board is finally completely repaired, it must be installed back to the original circuit for inspection. Only then. In order to obtain the correct result of this inspection process, to judge whether the circuit board with the replacement of the electrical and electronic components is repaired, it is best to check whether the auxiliary power supply of the electric induction furnace of one electric two furnace is correctly supplied to the relevant circuit board as required. The upper and the interface plug-ins on the board are plugged in reliably. And to eliminate the impact of circuit board peripheral circuit failure, in order to correctly guide the maintenance work.

2 , clean first, then repair

For an electric two-furnace medium frequency induction melting furnace with heavy pollution , first clean the panel buttons, terminals and contact points, and check whether the external control keys are malfunctioning. Examining a medium frequency induction furnace two electric melting furnace interior, it should focus on a two internal electrical frequency induction furnace melting furnace is clean, if the components found, two leads within an electrical furnace frequency induction melting furnace, the dust has to go between the lines, Contaminants, spider webs or excess solder, soldering oil, etc. should be removed first and then repaired, which can reduce natural faults and achieve twice the result with half the effort. Practice has shown that many faults are caused by dirt, dust, and foreign matter. Once cleaned or cleared, the fault will automatically disappear.

3 , the first power circuit, the rear function circuit

The power supply is the heart of an electric two-furnace intermediate frequency induction melting furnace . If the power supply is not normal, it is impossible to ensure the normal operation of other parts, and there is no way to check other faults. According to experience, the failure rate of the power supply part accounts for the highest proportion in the whole machine. Many faults are often caused by the power supply. Therefore, the maintenance of the power supply circuit can often get twice the result with half the effort, and the maintenance of one electric two-furnace intermediate frequency induction melting furnace . The main circuit power supply part, the control power supply part, the control circuit and the trigger circuit part should be repaired first, and finally the order of the display part. This is because the power source is the source of energy for the normal operation of each part of the medium-frequency induction melting furnace , and the control circuit is the basis for normal operation.

4 , first universal, after special

In the absence of a clear understanding of the electric melting furnace frequency induction furnace failure of two parts, a number of adjustable components not within a medium frequency induction melting furnace two electric furnace blind adjustment, in order to avoid artificially complex of the fault. When the protection circuit components such as fuses or current limiting resistors in the machine are hit or burned, it is necessary to carefully check whether there are any problems with the surrounding circuits. After confirming that there is no problem, replace them and restore the power supply. Failure due to component quality or external factors caused, usually accounts for 50% of the common faults of a power failure two special furnace medium frequency induction melting furnaces are mostly soft fault, rely on the experience and instruments to measure and repairs. According to the common characteristics of an electric two-furnace medium frequency induction melting furnace , common faults with universality and regularity are eliminated, and then special circuits (including some special components) are inspected. In order to gradually reduce the scope of the fault, from face to point, to achieve the effect of shortening the repair time.

5 , first peripheral, then replace

After determining the damaged components, do not rush to replace them. After confirming that the peripheral circuits are normal, consider replacing the damaged electrical components. When inspecting an integrated circuit, when the voltage of each pin of the integrated circuit is abnormal, do not rush to replace the integrated circuit. Instead, check the peripheral circuit first, and then consider replacing the integrated circuit after confirming that the peripheral circuit is normal. If you do not check the peripheral circuit, blindly replacing the integrated circuit can only cause unnecessary losses, and now there are many pins on the integrated circuit, which will be damaged if you pay little attention. It can be seen from the maintenance practice that the failure rate of the peripheral circuits of the integrated circuit is much higher than that of the integrated circuit.

6 , first troubleshoot, then debug

In the overhaul, circuit faults should be eliminated before debugging. Because debugging must be done under the premise of normal circuit. Of course, some faults are caused by improper debugging. At this time, it is only necessary to directly debug and return to normal.Be sure to pay attention to the quality of the solder when replacing components, and do not cause solder joints. In addition, the welding time should not be too long, so as not to damage the components and cause unnecessary economic losses. Multiple welding of electrical and electronic components can easily cause the copper foil to fall off the board. After replacing the components, a foreign body within two electric furnace medium frequency induction melting furnace to promptly clean up, wiring and connectors to re-check it again, and in place, so as to avoid further human error.

7 , first DC, then exchange

During the inspection, the inspection of the electronic circuit must first detect the static working point of the DC circuit and then detect the dynamic working point of the AC circuit. DC and AC here refer to the DC and AC circuits of the electronic circuit. These two circuits are complementary, and the AC circuit can work normally only if the DC link is normal.

9 , first no power measurement, after power test

Firstly , statically check one electric two-furnace intermediate frequency induction melting furnace without electric current . If it is normal, then dynamically check one electric two-furnace intermediate frequency induction melting furnace under power supply . If the power is turned on immediately, it may artificially expand the fault range, burn more components, and cause undue losses. Therefore, before the power failure of the fault -electric two-furnace medium-frequency induction melting furnace , static inspection must be carried out, and the power can be detected under static normal conditions.

9 , first shared circuit, rear unit circuit

The common circuit of the one-frequency two-furnace intermediate frequency induction melting furnace fails, and the energy and information cannot be transmitted, so that the performance of each unit circuit is degraded and the function is lost. If the power supply of a one-electric two-furnace intermediate frequency induction melting furnace fails, the entire system cannot operate normally, and the energy and information transmitted to various unit circuits cannot be realized. Thus, to be followed in order to access a common circuit, the unit circuit, - fast, accurate troubleshooting has a two-frequency induction furnace melting furnace.

The failure of an electric two-furnace intermediate frequency induction melting furnace is manifested as diversity. Any one faulty electric two-furnace intermediate frequency induction melting furnace is overhauled, and the fault phenomenon, cause, overhaul, skill, and experience should be recorded in a special notebook. In order to accumulate maintenance experience, and to increase their own experience L to the theory under the guidance of the theory, to achieve specific failure analysis, in order to accurately and quickly eliminate the fault. Only in this way can we cultivate ourselves as an expert in repairing the failure of a medium-frequency induction melting furnace .

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