A speed sensor is indispensable for a Perkins generator. And the quality of the speed sensor directly affects the stability and safety of the unit. Therefore, it is very important to ensure the quality of the speed sensor. This requires the correctness of the installation and use of the unit speed sensor. Here is a detailed introduction to you:
1. Due to the vibration of the sensor mounting bracket when the generator 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.
Treatment method: According to actual experience, the distance is generally about 2mm, which can be measured with a feeler gauge.
3. If the oil thrown by the flywheel sticks to the working surface of the sensor, it will have a certain impact on the measurement results.
Treatment method: 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, resulting in the fluctuation of 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.
1. Due to the vibration of the sensor mounting bracket when the generator 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.
Treatment method: According to actual experience, the distance is generally about 2mm, which can be measured with a feeler gauge.
3. If the oil thrown by the flywheel sticks to the working surface of the sensor, it will have a certain impact on the measurement results.
Treatment method: 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, resulting in the fluctuation of 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.
Treatment method: Use the frequency generator to input the frequency signal to verify the speed transmitter, and tighten the terminals. Since the speed transmitter is controlled by plc microcomputer, it can be readjusted or replaced if necessary.
