The inverter reports the voltage and abnormal voltage measurement of the motor: 1. The inverter reports the voltage. When the inverter reports a voltage trip, in order to determine whether the inverter is really overvoltage, the simplest and most reliable method is to measure the voltage on the DC bus. If the voltage on the DC bus is measured to reach the overvoltage value, it is reported by the inverter; if the measured voltage does not reach the overvoltage value, the inverter will be falsely reported. The reason for the false alarm of the inverter is mostly that there is a problem with the sampling detection circuit of the inverter.
The method of measuring the DC bus voltage is to hit the 47 -type multimeter to 1000V DC, and measure the voltage across the DC bus. Generally, the over-voltage alarm value of the inverter is designed between 700~780V . When the measured value is within this range, The frequency converter does generate an overvoltage fault. If the voltage is below 540~700V , it is in the normal range, it is the voltage detection circuit of the inverter false alarm. The inverter generates a false alarm that the DC bus voltage exceeds 540V , but the alarm has not yet reached the set value of the overvoltage alarm.
Regarding the overvoltage problem of the inverter, if there is no feedback energy, the general voltage will not exceed 540V , which exceeds this value, and most of the inverter generates feedback energy. In some cases, the reason why the inverter generates feedback energy is not obvious. The voltmeter can be connected for a long time, monitor the voltage on the DC bus, observe when the voltage rises, and whether there is a correspondence between the operation status of the load, etc. To determine the source of the overvoltage generated.
2. The motor works abnormally. If the motor is weak and the sound increases, first measure the output voltage of the inverter. Because the output voltage is proportional to the output frequency, the voltage is not a certain value, but the three-phase voltage is balanced. So measuring the output voltage is actually measuring whether the three-phase voltage is balanced or disconnected. The output voltage of the inverter is unbalanced, mainly because the switch bridge arm is poor or damaged, causing the output voltage to be out of phase or unbalanced.
If the three-phase output voltage of the inverter is balanced and continuous, the reason is in the motor itself.
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