The Cummins series 300 kW diesel generator set has been widely used due to its internationally renowned brand status and mainstream 300 kW power. But some users may not be fully aware of the reasons for their undervoltage alarm shutdown. Today, we will delve into this issue to satisfy everyone's curiosity.
Firstly, one possible reason is the issue with mechanical speed regulation. The Cummins series 300 kW diesel generator set has an oil pump mechanism that controls the fuel volume and oil circuit, and is equipped with a pull rod. The speed control rod is equipped with a speed limit top rod and a speed control top rod on both sides. If low voltage is reported after running for 20 seconds and the voltage and frequency cannot increase, it may be caused by speed issues. You can try adjusting the speed control lever.
Secondly, loose voltage sampling lines are also a possible cause. Once the voltage sampling line becomes loose, the voltage cannot be detected.
In addition, residual magnetism issues may also lead to undervoltage alarm shutdown. If the Cummins series 300 kW diesel generator set does not have residual magnetism, the voltage system will not be established. At this point, it is necessary to check the excitation output voltage of the AVR voltage regulator of the generator and connect it to the voltage source for magnetization accordingly.
Furthermore, if there is a grounding fault in the Cummins 300 kW diesel generator set, such as three-phase grounding, it will result in low voltage and current. At this point, it is necessary to check whether the grounding discharge device is closed or grounded.
In addition, board failure may also be one of the reasons for the undervoltage alarm shutdown. Especially in parallel situations, due to the AVR voltage regulator adjusting based on the main bus voltage, there may be signal connection errors or the need to adjust the voltage.
Finally, damage to the varistors or rectifier bridge diodes on the windings of the Cummins 300 kW diesel generator set may also result in undervoltage alarm shutdown.
Cummins has two Sino-US joint ventures, Chongqing Cummins and Dongfeng Cummins, in China. Its parent company, Cummins USA, is a leading manufacturer of diesel engines and compressed natural gas engines. The Cummins series 300 kW diesel generator set combines advanced manufacturing technology from the United States and the characteristics of the Chinese market, developed and designed with the concept of heavy-duty engine technology. It has significant advantages such as strong power, high reliability, good durability, fuel economy, small size, high power, high torque, strong universality of components, and environmental protection.