| a. Check whether the display of the operation panel is normal, and observe whether the display of the panel is damaged, shallow or incomplete. If there is any abnormality, replace the panel or repair it in time. | ||||||
| b. Check whether the power supply voltage, output voltage and DC bus voltage are normal. Use a mechanical multimeter to measure the three-phase power supply voltage respectively. Under normal circumstances, it should be balanced. The voltage value is within the normal range, and the single-phase power supply voltage is also within the normal range. If the u/v/w three-phase is unbalanced or the output voltage is low, the frequency converter should be shut down for maintenance. The DC voltage value is too low (compared with the monitoring value d-4/d0.007), which also needs to be checked and repaired. | ||||||
| c. Check whether the input and output cables are heated, deformed or burnt out. If so, the wiring terminals are usually loose and need to be tightened, or the wires need to be replaced after shutdown. | ||||||
| d. Check whether the fan operates normally. If not, stop the machine and clean it or replace it. | ||||||
| e. Check whether the temperature of the radiator is normal (it can be measured with an infrared thermometer). If it is abnormal, if the ambient temperature is too high, measures should be taken to reduce the ambient temperature; If the fan has reached its service life and accumulated dust and oil, resulting in the temperature rise of the radiator, it should be cleaned or replaced. | ||||||
| f. Check the frequency converter for vibration. A long handle screwdriver can be used to touch the frequency converter with one end, and the ear is close to the screwdriver handle, and slight vibration can be found. This phenomenon is usually caused by mechanical vibration, which will cause mechanical damage to electronic devices. Rubber pads can be added to reduce or eliminate vibration, or on the premise of ensuring accuracy, parameters can be adjusted to avoid mechanical resonance points. | ||||||
| g. Check whether the frequency converter has peculiar smell during operation | ||||||
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