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With the maturation and perfection of low-voltage AC frequency control technology, general-purpose inverters have been rapidly and widely applied. But sometimes, due to the particularity of working conditions, general-purpose inverters seem to be stretched. For example, coal belt conveyors, hoist winches, fans, scraper conveyors and other motor-driven devices that require speed regulation, and chemical plants Some devices are just one example. Explosion-proof inverter is developed for these special conditions. For the explosion-proof inverter, simply speaking: It is a universal inverter installed in the explosion-proof shell. However, if you really want to put a universal inverter in an explosion-proof enclosure to make an explosion-proof inverter, that's a lot more problematic.
In the process of using the inverter, there will be many problems, which we cannot predict and guess. Only by looking for the cause of the failure of the explosion-proof inverter, can we solve the problem and solve the problem so that it can work and operate normally.
For the use of low voltage frequency converters in the field of explosion protection, in order to meet the needs of the market in hazardous gas environments, explosion-proof electrical appliances professionally developed by Wochuan to be used as equipment that works in companies with hazardous environments, then for electrical products, there is Some faults, for some explosion-proof inverter fault solution, in fact, is to solve the inverter fault.
When the inverter is just powered on, because the capacity of the flat wave capacitance on the DC side is very large and the charging current is very large, usually a starter resistor is used to limit the charging current. The common frequency converter starts two circuits; after the charging is completed, the control circuit passes the relay. The contact or thyristor will short-circuit the resistor. The start-up circuit fault is generally shown as a start-up resistor is burned out. The inverter alarm is displayed as a DC bus voltage fault. Generally, when the designer designs the start-up circuit of the inverter, it is selected to reduce the size of the inverter. The resistors are all chosen to be smaller, with resistance values ​​ranging from 10 to 50Ω and powers from 10 to 50W.
When the AC input power of the frequency converter is frequently turned on, or the contact of the bypass contactor is in poor contact, and the on-resistance of the bypass thyristor becomes large, it will cause the starting resistor to burn out.
For the above situation, you can buy the resistor with the same specifications, and must find out the cause of the resistor burn out.
If the fault is caused by the opening and closing of the input-side power supply frequency, this must be eliminated to put the frequency converter into service; if the fault is caused by a bypass relay contact or a bypass thyristor, these devices must be replaced. Then for these common faults can be repaired as described above, may allow the inverter to work properly.
The above content is the analysis of the charging and starting failure of the explosion-proof inverter. The engineers and technicians can refer to the reading and make an accurate fault diagnosis based on the actual situation of the inverter to make the problem repair.
What is explosion-proof inverter? What is the concept and overview of explosion-proof inverters? Here's a rough idea: