Why the Frequency of Cummins Diesel Generator Set is Unstable

There are many precautions for us to pay attention to in the use of diesel generator. Many people do not know what causes the frequency instability of diesel generator set. When the generator set operates at high frequency, the voltage is too high, and the centrifugal force on the rotor increases when the frequency increases, which will damage some parts, leading to the frequency instability of diesel generator set. Next, Dingbo Power will introduce the causes and solutions of unstable frequency of diesel genset in detail.

1. Causes of frequency instability of diesel generator set

（1）If the frequency of the diesel generator set is unstable or deviated from the ratio, it will have adverse effects on the equipment. Keep the frequency above or below the rated value of 50HZ. Remember not to exceed the rated power. When the generator set operates at high frequency, the voltage is too high and the frequency is too high, which is mainly limited by the rotating mechanical strength. High frequency and high motor speed will increase the centrifugal force on the rotor, which will easily damage some parts of the rotor. The decrease in frequency causes a decrease in the rotational speed of the rotor, resulting in a decrease in the air volume blown in by the fans at both ends, deteriorating the cooling conditions of the generator, and increasing the temperature of various parts.

（2）The speed of the motor used by the user is related to the system frequency, and frequency changes will change the speed of the motor, thus affecting the quality of the product.

（3）The frequency instability of diesel generator set will affect the normal operation of electronic equipment.

（4）When the diesel generator set operates at low frequency, the ventilation volume of the diesel generator set will be reduced. In order to maintain the normal voltage, it is required to increase the excitation current to increase the temperature rise of the generator head and rotor. In order not to exceed the temperature rise limit, it is necessary to reduce the generating capacity of the generator.

（5）The power and frequency of a generator set have a specified range. If it exceeds the range, it will have an impact on the electrical appliances. If the voltage is too high, it will burn out the electrical appliances. If the voltage is too low, the electrical appliances will also work abnormally. The output power is related to the load. For the same load, if the voltage is too high, the current will increase and the power consumption will also increase.

（6）When the frequency of the diesel generator set decreases, the reactive power load will increase, which will lead to the decrease of the system voltage level.

2. Troubleshooting method for unstable working frequency of diesel generator set

（1）The air filter is too dirty and the intake air is insufficient. At this time, it is necessary to clean or replace the air filter.

（2）The fuel filter device is too dirty and the fuel injection volume is not enough, it needs to be replaced or cleaned.

（3）The ignition time is incorrect and needs to be adjusted.

The above content about the "causes of unstable frequency of diesel generator set and troubleshooting methods", and we hope it will be helpful to you. Dingbo Power is a professional and reliable manufacturer of diesel generator sets. If you also want to buy diesel generator sets, please contact us by email dingbo@dieselgeneratortech.com.