1. Overview
With the continuous development in the field of automation, the application of inverter has also penetrated into all walks of life. The development of inverter is also constantly innovating, with more and more functions and correspondingly improved reliability. However, if it is used improperly, the operation is wrong, and the maintenance is not timely, failures or changes in operating conditions will still occur to shorten the service life of the equipment. Therefore, daily maintenance and repair work is particularly important.

2. Attention

The operator must be familiar with the basic working principle and functional characteristics of the inverter, and have basic knowledge of electrician operation. Before inspecting and maintaining the inverter, the total power supply of the equipment must be cut off;

and wait until the power lamp of the inverter is completely extinguished.

3. Daily inspection items

Before powering on the inverter, check the temperature and humidity of the surrounding environment. Excessive temperature will cause the inverter to overheat and alarm. In severe cases, it will directly damage the inverter's power components and short circuit; excessively humid air will cause a direct short circuit inside the inverter. When the inverter is running, pay attention to whether the cooling system is in production, such as: whether the air duct is smooth and whether the fan has abnormal sound. Inverters with a relatively high protection level such as: inverters above IP20 can be installed directly open; inverters below IP20 should generally be installed in cabinets, so how does the cooling effect of the inverter cabinet directly affect the normal operation of the inverter. Exhaust system such as whether the fan rotates smoothly, whether there is dust and obstructions in the air inlet are all places that we can't ignore in daily inspections. Whether the motor reactor, transformer, etc. are overheated and smelly; whether the inverter and motor have abnormal noise; whether the inverter panel current display is too large or the current variation is too large, whether the output

UVW three-phase voltage and current are balanced, etc.

4 .Regular maintenance
Clean the air duct and dust inside the air filter. Check whether the screws, bolts and plug-in are loose, and whether the input and output reactors have short-circuits to the ground and the phase-to-phase resistance. The normal should be greater than tens of megohms. Whether the conductors and insulators are corroded, if necessary, wipe them with alcohol in time. When conditions permit, it is necessary to use an oscilloscope to measure the stability of the output voltage of each circuit of the switching power supply, such as: 5V, 12V, 15V, 24V and other voltages. Is there any distortion in the method of measuring each waveform of the driver circuit? Whether the UVW interphase waveform is a sine wave. Check if there is any trace of fire in the connector of the contactor. If it is serious, replace the new product with the same model or larger than the original capacity; confirm the correctness of the control voltage and carry out the sequence protection action test; confirm that the protection display circuit is not abnormal; confirm that the inverter is running alone the balance of the output voltage.
It is recommended that periodic inspections should be conducted once a year.