The cause of unstable frequency fault of generator set shall be judged from the place with high possibility and easy maintenance, and blind disassembly and inspection shall be avoided to increase the maintenance workload. From the analysis of the above fault causes, the causes of frequency instability can be divided into generator set problems and speed control system problems. Generally, the failure caused by the generator set is relatively common, and most engine management personnel are familiar with the diesel engine, so they can start with the generator set.

在排除油路問題的情況下，將噴油器拆下進行霧化試驗，發現霧化效果良好，可排出噴油器問題。為了減少維修工作量，可以將整組噴油泵拆下換到另一臺工作性能良好的柴油發電機組上進行測試。試驗表明，該機組柴油機轉速問題，電機發電頻率正常。到此，可將柴油機問題引起發電機組頻率不穩的原因排出，接下來對調速控制系統故障進行判定。

In the case of eliminating the oil circuit problem, first remove the fuel injector for atomization test. It is found that the atomization effect is good and the fuel injector problem can be discharged. In order to reduce the maintenance workload, the whole set of fuel injection pumps can be removed and replaced with another diesel generator set with good performance for testing. The test shows that the diesel engine speed of the unit is poor and the generator frequency is normal. At this point, the causes of generator set frequency instability caused by diesel engine problems can be eliminated, and then the fault of speed regulation control system can be determined.

將傳感器拆下清潔后按安裝間隙要求裝復后，故障依然，可將轉速傳感器的因素排除；在發動機停機狀態，短接控制器1、2腳，執行器應輸出大油位，經檢查發現輸出電壓正常，大供油量位置正確，電磁執行器與噴油泵齒條結合處沒有松動現象，可將執行器的因素排除；那么引起記載頻率不穩故障剩下一個原因了，就是電子調速器調整微分、增益調諧失靈。

After the sensor is disassembled and cleaned, it can be reinstalled according to the requirements of installation clearance. If the fault still exists, the factors of speed sensor can be eliminated; When the engine is stopped, short circuit pins 1 and 2 of the controller, and the actuator should output the maximum oil level. After inspection, it is found that the output voltage is normal, the position of the maximum oil supply is correct, and there is no looseness at the joint between the electromagnetic actuator and the fuel injection pump rack, so the factor of the actuator can be eliminated; Then the remaining reason for the instability of recorded frequency is the failure of electronic governor adjustment differential and gain tuning.

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