When performing Level 1 maintenance on industrial machinery, electrical equipment maintenance should be carried out in conjunction. For example, Level 1 maintenance on metal cutting machine tools is typically performed quarterly, with the machine tool operating for approximately 6 to 12 hours. At this time, the following maintenance should be performed on the electrical components inside the electrical cabinet:
First, clean accumulated dust and foreign objects from inside the electrical cabinet; second, repair or replace electrical components that are about to fail; next, tidy up the internal wiring to ensure it is neat and aesthetically pleasing; especially for emergency repair areas, restore them to their normal operating condition as much as possible; then, tighten the movable parts of fuses to ensure good contact; next, tighten the wire screws on the terminals and electrical components to ensure all wire connections are secure and reliable, reducing contact resistance; furthermore, perform minor and intermediate maintenance checks on the motor; finally, power on and test the machine to ensure the correct and reliable operation of the electrical components.
When performing Level 2 maintenance on industrial machinery, more in-depth maintenance of electrical equipment should be carried out in conjunction. For example, Level 2 maintenance on metal cutting machine tools is typically performed annually, with the machine tool operating for approximately 3 to 6 days. At this point, the following maintenance and upkeep should be performed on the electrical components inside the machine tool's electrical cabinet:
First, all maintenance and upkeep work performed during the first-level maintenance of the machine tool's electrical system should continue during the second-level maintenance. Second, focus on inspecting contactors and relay contacts that operate frequently and draw large currents. These components are usually made of silver or silver alloys, and a layer of silver oxide or silver sulfide will naturally form on the surface. This does not affect conductivity, so there is no need to remove it. Even if the contact surface shows signs of burning or unevenness, it is not necessary to repair or file it flat (but copper surfaces should be repaired promptly after burning). However, if the contact is severely worn to less than half its original thickness, it should be replaced. Third, inspect contactors and relays that produce significant noise. Identify the cause and repair them before continuing to use them; otherwise, replace them with new parts. Next, calibrate the thermal relay to ensure it operates normally. The calibration results should conform to the operating characteristics of the thermal relay. Then, calibrate the time relay to ensure its delay time meets the requirements. If the error exceeds the allowable value, it should be adjusted or repaired to meet the requirements again.
