Inverter aging parts introduction
It is believed that many personnel who repair the inverter have found that some inverter templates are often burned out. Usually, we will replace the module with new ones, and do not consider whether the module burnout has any relationship with the drive. Therefore, in the maintenance, more attention should be paid to the aging components on the drive circuit. The following describes the easy-to-age parts in the inverter. resistance Resistance, the material's resistance to current is called the resistance of the material. A material with a small electrical resistance is called an electrical conductor, or a conductor for short. The material with a large electrical resistance is called an electrical insulator, or an insulator for short. When measuring the resistance of a capacitor, the pointer of the multimeter swings an angle. The larger the capacity, the greater the angle. Discharge the capacitor during the second measurement Insulating paint Insulating paint is a kind of special paint in the category of paints based on high molecular polymer, which can be cured into insulating film or insulation in a certain condition. Radiator aluminum sheet must also be dust, cooling fan is broken or there is a sound on the new; filter capacitor capacity reduction by 20% also have to change (generally not more than 8 years); all the main circuit connecting screws and then tighten it. Regarding the disassembly and assembly of the patch: Some people often disassemble the chip integrated block because the temperature of the soldering iron is too high to cause damage or degraded performance. Before disassembling the integrated block, a small piece of water or sprinkling may be attached to the integrated block. Paper for heat dissipation, good results! Regulator The Zener diode is also a type of crystal diode, which operates by using a stable voltage characteristic of the breakdown region of the PN junction. Regulators are widely used in voltage regulators and some electronic circuits. We call this type of diode a Zener diode to distinguish diodes used in rectification, detection, and other unidirectional conduction applications. Ordinary electricians are more difficult to detect. It is best to replace them all. When repairing the frequency converter, it is also required to perform overall maintenance: The circuit board dust should be cleaned with sprinkling, blown dry, and then sprayed with insulating paint. Optocoupler Optocoupler full name is optocoupler, also known as optical isolator, referred to as optocoupler. It has a good isolation effect on the input and output electrical signals, so it is widely used in various circuits. At present, it has become one of the most versatile and versatile optoelectronic devices. On the circuit characteristics of the circuit driven by an optocoupler: Since this circuit has a feedback detection circuit, it is to compare the output signal of the three phases (Eu, Ev, Ew) with the drive signal. When the output of the inverter is detected as abnormal Then, a high-level signal is sent to the motherboard through an optocoupler. The inverter immediately cuts off the drive signal and displays an over-current or IGBT short-circuit fault. This protection is very fast. The inverter with this circuit is not easy to burn the module, but the problem is When the performance of the drive components of the inverter is unstable, the problems such as aging easily affect the driving work.
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