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What should be paid attention to in the installation of diesel generator set speed sensor?
May 17, 2022
There are three main sensors for diesel generator sets, namely oil pressure sensor, temperature sensor and speed sensor. The speed sensor monitors the speed of the diesel generator set in real time. Generally speaking, the rotational speed of the diesel generator set is stable at 1500 rpm or 1800 rpm. If the rotational speed of the diesel generator set is abnormal, there will be problems with the voltage and frequency, which will cause the diesel generator set to fail to operate normally. This requires us to understand the installation precautions of the diesel generator set speed sensor.
1. Due to the vibration of the sensor mounting bracket when the diesel generator set is running, the measurement signal is inaccurate, and the alternating magnetic field changes irregularly, causing fluctuations in the speed indication.
Treatment method: Reinforce the bracket and weld it with the diesel engine body.
2. The distance between the sensor and the flywheel of the diesel generator set is too far or too close (generally this distance is about 2.5+0.3mm). If the distance is too far, the signal may not be sensed, and if it is too close, the working surface of the sensor may be worn out. Due to the radial (or axial) movement of the flywheel during high-speed operation, too close a distance poses a great threat to the safety of the sensor. It has been found that the working surface of several probes has been scratched. According to practical experience, the distance is generally about 2mm, which can be measured with a feeler gauge.
3. If the oil thrown from the flywheel sticks to the working surface of the sensor, it will have a certain impact on the measurement results. If an oil-proof cover is installed on the flywheel, it can have a good effect.
4. The failure of the speed transmitter makes the output signal unstable, causing fluctuations in the speed indication or even no speed indication, and the electrical overspeed protection malfunction will be triggered due to its unstable operation and poor contact of the wiring head. In this regard, the frequency generator can be used to input the frequency signal to verify the speed transmitter, and the terminals shall be tightened. Since the speed transmitter is controlled by PLC microcomputer, it can be readjusted or replaced if necessary.
The above are the installation precautions for the speed sensor of diesel generator sets. The speed sensor in the automatic diesel generator set is an indispensable and important part, and the quality of the speed sensor directly affects the stability and safety of the automatic generator set, which requires users to I have a deeper understanding of the correctness of the installation and use of the diesel generator set speed sensor, I hope this article can help you.
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