解决中频炉故障的10条法则

1． 先动口再动手

对于有故障的电气设备，不应急于动手，应先询问中频炉产生故障的前后经过及故障现象。对于生疏的中频炉设备，还应先熟悉电路原理和结构特点，遵守相应规则。拆卸前要充分熟悉中频炉每个电气部件的功能、位置、连接方式以及与周围其他器件的关系，在没有组装图的情况 下，应一边拆卸，一边画草图，并记上标记。

2．  先外部后内部

应先检查中频炉设备有无明显裂痕、缺损，了解中频炉维修史、使用年限等，然后再对中频炉机内进行检查。拆前应排队周边的故障因素，确定为中频炉内故障后才能拆卸，否则，盲目拆卸，可能将设备越修越坏。

3．  先机械后电气

只有在确定机械零件无故障后，再进行中频炉电气方面的检查。检查电路故障时，应利用检测仪器寻找故障部位，确认无接触不良故障后，再有针对性地查看线路与机械的运作关系，以免误判。

4．  先静态后动态

在设备未通电时，判断电气设备按钮、接触器、热继电器以及保险丝的好坏，从而判定故障的所在。通电试验，听其声、测参数、判断故障，最后进行维修。如在电动机缺相时，若测量三相电压值无法着判别时，就应该听其声，单独测每相对地电压，方可判断哪一相缺损。

5．  先清洁后维修

对污染较重的中频炉电气设备，先对其按钮、接线点、接触点进行清洁，检查外部控制键是否失灵。许多故障都是由脏污及导电尘块引起的，一经清洁故障往往会排除。

6．  先电源后设备

中频炉电源部分的故障率在整个故障设备中占的比例很高，所以先检修中频炉电源往往可以事半功倍。

7．  先普遍后特殊

因装配配件质量或其他设备故障而引起的故障，一般占常见故障的50%左右。中频炉电气设备的特殊故障多为软故障，要靠经验和仪表来测量和维修。

8．  先外围后内部

先不要急于更换损坏的电气部件，在确认外围设备电路正常时，再考虑更换损坏的电气部件。

9．  先直流后交流

   检修时，必须先检查中频炉直流回路静态工作点，再交流回路动态工作点。

10． 先故障后调试

对于调试和故障并存的中频炉电气设备，应先排除故障，再进行调试，调试必须在电气线路速的前提下进行。

IF furnace solve 10 faults law

1 . First move again

For faulty electrical equipment, do not rush to start, you should first ask the intermediate frequency furnace before and after the failure and failure phenomenon. For the sparse medium frequency furnace equipment, you should also be familiar with the circuit principle and structural characteristics, and abide by the corresponding rules. Before disassembly, be fully familiar with the function, position, connection method and relationship with other surrounding components of the intermediate frequency furnace. If there is no assembly drawing, draw a sketch and mark it.

2 . External exterior

First check the medium frequency furnace equipment for obvious cracks and defects, understand the maintenance history and service life of the intermediate frequency furnace, and then check the internal frequency furnace. Before the disassembly, the fault factors around the queue should be queued and determined to be disassembled after the fault in the intermediate frequency furnace. Otherwise, blind disassembly may worsen the equipment.

3 . Mechanical and electrical

Only after determining that the mechanical parts are not faulty, perform an electrical inspection of the intermediate frequency furnace. When checking the circuit fault, you should use the testing instrument to find the fault location, and confirm the faultless fault after the contact, and then check the operational relationship between the line and the machine in order to avoid misjudgment.

4 . Dynamic after static

When the device is not powered, determine the quality of the electrical device buttons, contactors, thermal relays, and fuses to determine where the fault is. Power-on test, listen to its sound, measure parameters, judge faults, and finally perform maintenance. For example, when the motor is out of phase, if the three-phase voltage value cannot be determined, it should be heard and the relative ground voltage measured separately to determine which phase is defective.

5 . First clean and repair

For medium-frequency furnace electrical equipment with heavy pollution, first clean the buttons, wiring points and contact points, and check whether the external control keys are malfunctioning. Many faults are caused by dirty and conductive dust, which is often ruled out after cleaning.

6 . First power supply device

The failure rate of the power supply part of the intermediate frequency furnace accounts for a high proportion of the entire faulty equipment, so it is often more effective to repair the intermediate frequency furnace power supply first.

7 . First general after special

Faults caused by the quality of assembly parts or other equipment failures generally account for about 50% of common faults . The special faults of the intermediate frequency furnace electrical equipment are mostly soft faults, which depend on experience and instrumentation for measurement and maintenance.

8 . First outer and inner

Do not rush to replace damaged electrical components. When confirming that the peripheral circuit is normal, consider replacing the damaged electrical components.

9 . DC after AC

During maintenance, the static working point of the intermediate frequency furnace DC circuit must be checked first, and then the dynamic working point of the AC circuit.

10 . Debug after failure

For intermediate frequency furnace electrical equipment coexisting with commissioning and faults, the fault should be eliminated before commissioning. The commissioning must be carried out under the premise of electrical line speed.

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