Inverter is a commonly used power control system that is applied in many different fields. There is abrasion and failure during using the inverter. Then how can we reduce abrasion and failure? How can we increase the life of the inverter? In this paper, some ways for increasing service life of inverter will be introduced.
． Application Environment of Inverter
a. Working Temperature
There are high power electronic components inside inverter, which is easily affected by the working temperature. In general, working temperature of inverter is 0 ~ 55 ℃, but in order to ensure safe and reliable work, the best temperature should be controlled below 40 ℃. In the cabinet, the inverter should be installed upper the box and it should strictly abide installation instructions mentioned in the product manual. It is absolutely not allowed to installing heating elements or easy-heating elements closely to the bottom of the inverter.
b. Environment Humidity
When humidity is too high and temperature changes greatly, condensation is prone to occur inside inverter, which insulation performance will be greatly reduced. And it may even leads to short circuit accidents. If necessary, desiccant and heater must be added to tank.
c. Corrosive Gas
If corrosive gas concentration of the use environment is large, it not only will corrode leads, printed circuit boards of component, but also it will accelerate the aging of plastic devices and reduce insulation performance. In this case, the cabinet should be made of closed structure so as to change of air.
d. Vibration & Shock
When the control cabinet with the inverter is subject to mechanical vibration and shock, it can cause poor electrical contact. Besides improving the mechanical strength, away from the vibration source and the impact of the source, to avoid the bad result, we should use anti-seismic rubber pad to fix components like electromagnetic switch inside and cabinet outside that can cause vibration. When the equipment has been operated for a period of time, it should be inspected and maintained.
e. To prevent the input over-voltage
Usually, there is overvoltage protection at input end of inverter. However, if the input voltage is high for a long time, the inverter input end will be damaged. Therefore, in actual use, it should check the input voltage of the inverter, single-phase or three-phase inverter and rated voltage of the inverter. Especially, when the power supply voltage is very unstable, there should be voltage regulator equipment, otherwise it will cause serious consequences.
2. Design of Inverter Control Cabinet
The designing of inverter control cabinet electrical schematic diagram should be reasonable: up end of inverter is without leakage protection, down end of inverter is without contactor (no conversion between power frequency and variable frequency), capacitance, cooling fans; the inverter can be controlled to star or stop flexibly without contactor on the up end.
3. The Layout of Components in Inverter Cabinet
Reasonable layout and effective distance of components in inverter cabinet need enough cooling space and reasonable alignment.
4. Reasonable Setting of Inverter Parameters
Don’t use contactor on the up end on inverter to control start or stop.
5. Maintenance of Inverter
Inverter should be timely cleaning and maintenance.
1) Regularly clear fouling and dirty in the internal and air trunk of the inverter;
2) Meanwhile, users should check the following situation of the inverter to ensure the inverter can work normally or not:
a. If there is heating and discolored of inverter;
b. If there is cracking on cement resistor;
c. If there is leakage, expansion and protruding explosion hole happen to electrolytic capacitor.
d. If PCB board can work normally;
e. If there is overheating component.
When the maintenance is finished, users should reset parameters and cables of inverter. The inverter should be powered to run with 3Hz low frequency so as to ensure the inverter can work normally.