Frequency converter is an important part of the motor control system, which can output to the motor according to the set frequency and voltage, thus adjusting the speed and load of the motor. However, in the process of using the inverter, the output voltage fault of the inverter sometimes occurs, which will affect the normal operation of the equipment if it is not handled in time.
1, check whether the line is normal.
When dealing with the output voltage fault of frequency converter, it is necessary to eliminate the possibility of motor line fault first. You can check whether the motor line interface is in good contact and whether there are abnormal conditions such as short circuit and open circuit. If necessary, you can disassemble the motor shell for inspection. At the same time, it is also necessary to check whether the wiring of the output voltage of the inverter is firmly fastened and whether there is poor contact.
2. Analyze the internal fault causes of frequency converter.
If there is nothing wrong with the circuit itself, it is necessary to further analyze the internal fault causes of the inverter. The damage of internal components of frequency converter is one of the main reasons for the instability or lack of output voltage. At this time, it is necessary to check and replace the internal capacitors, resistors and transistors of the frequency converter to ensure the stable operation of the equipment.
3. Check whether the power supply voltage is stable.
The normal operation of the inverter requires a stable power supply voltage. If the power supply voltage is unstable, it will easily lead to the failure of unstable or missing output voltage. Therefore, when dealing with the fault of inverter output voltage, we should also check whether the power supply voltage is normal. If the power supply voltage fluctuates frequently or is abnormal, it is necessary to replace or repair the power supply in time.
4, adjust the inverter parameters
When dealing with the output voltage fault of frequency converter, sometimes it is only necessary to adjust the parameters of frequency converter properly to eliminate the fault. For example, the output voltage, frequency and start/stop time of the inverter can be adjusted to eliminate the noise, vibration and other undesirable phenomena when the motor is working. At the same time, the control accuracy and system stability can be improved by adjusting the coefficient of the feedback loop.