Thyristor medium frequency induction heating furnace power supply maintenance 10 rules

Thyristor medium frequency induction heating furnace power supply maintenance 10 rules

The thyristor intermediate frequency induction heating power supply uses a thyristor to convert three-phase power frequency alternating current into single-phase alternating current of hundreds or thousands of kilohertz. It has the characteristics of convenient control, high efficiency, reliable operation and low labor intensity. The rapid development of the past decade has made its reference field more and more extensive. The characteristics of non-standard products, medium frequency power supply, furnace body, capacitors, mechanical transmission, and the linkage between hydraulic station and water circulation system require maintenance personnel to have professional basic knowledge of water, electricity and gas, and on-site maintenance experience.
The maintenance of intermediate frequency furnace equipment should follow the following 10-stage principle of electrical equipment maintenance.
1.open the mouth first and then start. For faulty electrical equipment, do not respond to it, you should first ask the fault phenomenon before and after the fault. For unfamiliar devices, you should also be familiar with circuit principles and structural features and follow the appropriate rules. Before disassembly, familiarize yourself with the function, location, connection method, and relationship to other equipment around the electrical components. If there is no assembly drawing, sketch and mark it.
2. Before the outside and inside, check the equipment for obvious cracks and defects, and understand its maintenance history and service life, then check the machine. Before disassembly, the surrounding fault factors should be excluded and disassembled after it is determined to be an internal fault. Otherwise, blind disassembly may cause the device to deteriorate.
3. Electrical after the machine First, after confirming that there is no malfunction of the mechanical parts, perform an electrical inspection. When checking for circuit faults, use the test instrument to find the fault location and confirm the fault-free fault after contact, and then check the operational relationship between the line and the machine to avoid false positives.
4. Static and Dynamic First, when the device is not powered, determine the electrical device buttons, contactors, thermal relays and fuses to determine the fault. Start the test, listen to the sound, measure the parameters, judge the fault, and finally perform maintenance. For example, when the motors are out of phase, if the three-phase voltage value cannot be determined, the relative ground voltage should be heard and measured separately to determine which phase is defective.
5. Cleaning after cleaning For the most polluting electrical equipment, first clean the buttons, wiring points and contact points, and then check if the external control keys are faulty. Many faults are caused by dirt and conductive dust, which is often removed after cleaning.
6. After power supply, the failure rate of the power supply part of the equipment accounts for a large proportion of the total faulty equipment, so it is often more effective to check the power supply first.
7. First of all, it is common and special due to failure of assembly or other equipment failure, which usually accounts for about 50% of common faults. The special faults of electrical equipment are mainly soft faults, experience and instrument measurement and repair.
8. First, after external and internal, do not rush to replace damaged electrical components. When confirming that the peripheral circuit is normal, consider replacing the damaged electrical component.
9. When first DC and then AC repair, you must first check the static operating point of the DC circuit and then check the dynamic operating point of the AC circuit.
10. The first fault after commissioning For electrical equipment that is simultaneously commissioned and faulty, the fault should be eliminated before commissioning. Commissioning must be done at the wire speed.
 

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