Inverter fault handling method

Inverter abnormality refers to the three situations of undervoltage, phase loss and power outage, and sometimes it is a combination of several situations. The primary cause of the power defect is the lightning strike, and the short circuit of the power supply system. Sometimes, due to power supply problems, the self-supplied generator set is used to generate electricity, resulting in a voltage that is not determined and the frequency is not determined. Most things are short-lived (usually a few seconds), and once the power returns to normal, the device continues to operate. At this time, the inverter should have an instantaneous power failure and restart function. The following methods are usually used to avoid the above-mentioned defects:

1. When the power failure time is long, if there is a motor or electric furnace directly starting near the inverter, when the grid voltage drops beyond the normal operation plan of the inverter, the inverter is usually cut off from the power supply.

2. The power outage is instantaneous, and the equipment should be satisfactory for continuous operation. At this time, the inverter should be operated normally. First of all, we must understand the motor deceleration characteristics of the drag load, and use the tachogenerator to measure the internship speed of the restart. This control is called the instantaneous power failure restart function of the inverter.

3, the most important equipment, must not allow the inverter to work intermittently, and it is necessary to use the non-stop power supply (UPS) and the inverter to actively switch.

There is also a case where the power supply sometimes has a phase loss, and the inverter is in a phase loss operation. At this time, the overcurrent condition and current ripple of the rectifier are constantly checked.