柴油发电机组转速测量保护系统常见故障及对策：
①传感器与飞轮之间的距离太远或太近一般此距离约为2.5+0.3 mm。距离太远将有可能感应不到信号，太近有可能磨坏传感器的工作面。由于飞轮在高速运转中，会发生径向（或轴向）窜动，距离太近对传感器的安全构成极大威胁，曾经发现有几个探头的工作面已被刮破。根据实际经验，该距离一般在2 mm左右较为适宜，可用塞尺测量。
②由于传感器安装固定架振动，使得测量信号不准确，交变磁场产生不规则变化，引起转速指示波动。处理方法：加固该支架，可以将其与柴油机本体焊接。
③由于飞轮甩出来的油粘在传感器工作面上，对测量结果产生一定的影响。若在飞轮上加装防油罩，可起到良好效果。
④速度变送器故障，使输出信号不稳定，造成转速指示波动甚至无转速指示，而且由于其工作不稳定和接线头的接触不良会触发电气超速保护误动作。对此可用频率发生器输入频率信号对速度变送器进行校验，端子进行紧固。由于该速度变送器为PLC微电脑控制，必要时可重新调整或更换。
⑤传感器故障。 在测量好间距之后，开盘车机观察传感器上的红色发光二极管，当飞轮齿通过时，其发光亮度会明显增强，或不开盘车机用金属物靠近或远离传感器，观察红色发光二极管亮度有无变化，如果亮度没有变化或者根本没有发光，则可能是传感器损坏，需要更换。CMR524系统在起动时报“调速器故障”，大都是传感器故障。
Common faults and countermeasures of speed measurement and protection system for diesel generator set:
① The distance between the sensor and the flywheel is either too far or too close, typically around 2.5+0.3 mm. If the distance is too far, it may not sense the signal, and if it is too close, it may damage the working surface of the sensor. Due to the radial (or axial) movement of the flywheel during high-speed operation, the proximity poses a great threat to the safety of the sensor. It has been found that the working surfaces of several probes have been scratched. Based on practical experience, a distance of around 2 mm is generally suitable and can be measured with a feeler gauge.
② Due to the vibration of the sensor mounting bracket, the measurement signal is inaccurate, and the alternating magnetic field produces irregular changes, causing fluctuations in the speed indication. Solution: Strengthen the bracket by welding it to the diesel engine body.
③ Due to the oil thrown out by the flywheel sticking to the working surface of the sensor, it has a certain impact on the measurement results. If an oil guard is installed on the flywheel, it can have a good effect.
④ The malfunction of the speed transmitter causes unstable output signals, resulting in fluctuations or even no speed indication. Moreover, due to its unstable operation and poor contact of the wiring head, it can trigger electrical overspeed protection misoperation. To verify the speed transmitter, a frequency generator can be used to input a frequency signal, and the terminals can be tightened. Due to the speed transmitter being controlled by a PLC microcomputer, it can be readjusted or replaced if necessary.
⑤ Sensor malfunction. After measuring the spacing, open the car machine and observe the red LED on the sensor. When the flywheel teeth pass through, its brightness will significantly increase. Alternatively, if the car machine is not opened and a metal object is used to approach or move away from the sensor, observe whether the brightness of the red LED has changed. If there is no change in brightness or no light at all, it may be that the sensor is damaged and needs to be replaced. The CMR524 system reports a "governor fault" during startup, mostly due to sensor malfunctions.
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