In order to protect the inverter, when the bus voltage is too low, the inverter will report the undervoltage problem and close the pulse output of the inverter. This is an important and necessary way to protect the inverter equipment from damage. This issue also cannot be blocked.
There is a bus voltage check organization inside the inverter, and when the bus voltage measurement value is lower than a certain threshold, the inverter will report the undervoltage problem.
There are many reasons for the formation of DC bus undervoltage, which should be analyzed according to the actual situation. If you find the right source and then prescribe the right medicine, you can generally deal with it.
1. The first is the influence from the incoming line voltage.
If the quality of the power grid is not good, and there is a momentary voltage drop, it will inevitably form a bus voltage that is too low. In the process of starting large equipment, it is inevitable that the grid voltage will drop. Occasional momentary voltage drops are difficult to capture, making it more difficult to diagnose the problem. If it can be confirmed that there is a problem with the quality of the power grid (such as a short-term drop in voltage formed when the large motor is started), and it is difficult to change such a power environment, then the "active restart" function of the inverter can be enabled, and when the voltage drops, the inverter will be stopped under voltage; When the grid is restored, the inverter actively starts again.
It is also a good option to add a voltage regulator to the inlet. However, it is necessary to use the inverter-specific one.
During lightning, it may also have an instantaneous impact on the grid voltage, and it may also form an undervoltage problem of the inverter. However, lightning is also a very accidental event, and it will not always bother the operation of the inverter. However, for safety reasons, the factory should have lightning protection measures.
2. The second is the influence from the output side, that is, the inverter side.
When the motor accelerates, the motor obtains electrical energy from the inverter and converts it into kinetic energy. If the acceleration time is short and the acceleration degree is very high, the bus voltage will be quickly pulled down, resulting in an undervoltage problem. In response to this situation, the general solutions are:
Extend the acceleration moment
If the PID technology controller is used, pay attention to the echo of the descent system, subtract P and add I, and extend the filtering time
3 Finally, there is the hardware issue.
If the voltage detection organization inside the inverter is not working properly, there may be a problem with the CPU processing mechanism, which cannot be handled by setting parameters and needs to be repaired. If the bus voltage measurement with a multimeter is compared with the inverter parameters, if the bus voltage measurement value is significantly different from the displayed value, it can be considered as a frequency converter problem.
In addition, the most basic electrical problems need to be eliminated:
The power supply is out of phase
Brake unit pass-through (if any)
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