Caused by low voltage.
The unstable output voltage of the generator may be caused by the following reasons: the generator is overloaded, large electrical appliances on the load are frequently started, causing large voltage fluctuations, or the generator itself has bad factors, including unstable excitation voltage or poor carbon brush contact. Specifically, you can check the excitation winding and excitation power components.
Possible causes and solutions:
1. The load exceeds the rated power of the generator and the generator enters an overload state - check if the current after charging the generator exceeds the rated power. current, thus discharging part of the charge.
2. The generator's automatic voltage regulator (AVR) is out of tune and the voltage is too low at full load - readjust the voltage regulator.
3. Failure of the main engine that drives the generator, such as insufficient oil supply, poor governor, reduced cylinder performance, etc. - Check the oil and gas circuit, calibrate the regulator and overhaul the engine. .