1. Not manifested. This situation is relatively common, generally in the normal condition of the external three-phase power supply, it is the switching power supply of the inverter burned, and the 24 volt power supply on the output board of the inverter terminal can be measured, if not, it is this problem, this situation is generally the switch tube is burned more, and it can be briefly replaced.
2. The output is unbalanced. If the unbalance rate exceeds plus or minus 15%, it must not be used, it can be measured by the voltage level of the multimeter whether the voltage is balanced, and the clamp meter is used to measure the current conditionally, and the connection line between the inverter and the motor is disconnected when the three-phase output is confirmed to be unbalanced, and the resistance value of the resistance between the three phases of the motor is briefly measured with a multimeter alone, if the motor has a problem, the motor needs to be repaired. If the motor is normal, this situation is generally that the IGBT is broken, and the drive circuit is generally faulty.
3. The speed is unstable. Try to avoid the inverter operating at low frequency, the general need to set the inverter above 8Hz, if the high frequency is still unstable, you can adjust the V/F ratio to a lesser point. If it is a vector control form, the motor parameters may change and cause parameter mismatch, so you can redo the parameter matching between the inverter and the motor, and then save it.
4. The motor is too loud and the motor temperature is high. If the carrier frequency can be appropriately increased, the output waveform of the inverter will be more ambitious. If the inverter interferes with other equipment during operation, the carrier frequency can be appropriately reduced.
5. The newly installed inverter cannot start the operation. Many inverters are set to the panel operation form at the factory, that is, they are started through the start button of the panel, and the frequency is given through the key of the panel, so if you use the external terminal control of the inverter, of course, it cannot be used directly, and you can find the frequency source and the given signal source in the parameters, and set it to the corresponding external control form.
6. If the current of the inverter is too large for a long time, you can check the fan of the inverter outlet to see if there is a lot of dust or the like, sticking to the fan blades, or there are many dirty things in the main circuit of the inverter.
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