Ten Principles of Maintenance of Frequency Converters and Maintenance of Electrical Equipment

Ten principles of inverter maintenance:

1. First, move the mouth and then start to work. For faulty electrical equipment, do not respond to hands-on operations. Before and after the failure, you should ask about the failure and phenomenon.

For unfamiliar equipment, you should also be familiar with the circuit principle and structural characteristics, and abide by the relevant rules. Before disassembling, you must fully familiarize yourself with the functions, locations, and connection methods of each electrical component and the relationship with other devices around you. In the absence of an assembly drawing, you should remove them while drawing a sketch and mark the mark 2. Should first check the equipment for obvious cracks, defects, understand its history of maintenance, service life, etc., and then check the machine. Before the demolition, the fault factors in the surrounding area should be lined up, and it can be disassembled after being determined as a fault in the machine. Otherwise, blind demolition may cause the equipment to be repaired and damaged.

3. After the machine is mechanical, check the electrical aspects only after determining that the mechanical parts are not faulty. When inspecting circuit faults, the fault location should be found by using the testing equipment, and after confirming that there is no fault of the fault, the operational relationship between the circuit and the machine can be specifically viewed to avoid misjudgment.

4. First static and dynamic After the device is not powered, determine the quality of the electrical equipment buttons, contactors, thermal relays, and fuses to determine the location of the fault. Power test, listen to its sound, test parameters, determine the fault, and finally repair. If the motor lacks phase, if the measured three-phase voltage value cannot be discriminated, one should listen to the sound and measure each relative ground voltage separately to determine which phase is missing.

5. First, after cleaning, repair the heavy pollution electrical equipment, first clean the button, wiring point and contact point, and check if the external control key is malfunctioning. Many of the faults are caused by dirt and conductive dust, which are often ruled out by cleaning.

6. The failure rate of the power supply part of the equipment after the first power supply occupies a high proportion in the entire faulty equipment, so the maintenance of the power supply first can often be a multiplier.

7. First, after the general failure caused by the quality of assembly parts or other equipment failures, generally accounts for about 50 common faults. The extraordinary faults of electrical equipment are mostly soft faults, which require *experience and metering to measure and repair.

8. Do not rush to replace the damaged electrical components before the outside first, then consider replacing the damaged electrical components when confirming that the peripheral circuit is normal.

9. After the first DC and AC maintenance, you must first check the static working point of the DC circuit and then the dynamic operating point of the AC circuit.

10. Debugging after the first fault For the electrical equipment that coexists with debugging and faults, the fault should be eliminated first, and then debugging. The debugging must be performed under the premise of the electrical line speed.