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Generator sets are key equipment for industrial production, public services and emergency support. Their operational stability is directly related to the continuity of production and the safety of life and property. The core of daily maintenance is to avoid potential hazards in advance and extend the service life of equipment through systematic inspection and maintenance, ensuring reliable activation at critical moments. This article, in combination with the characteristics of the equipment and application scenarios, sorts out the key points of operable maintenance, providing professional references for operation and maintenance work.   I. Core Principles and Objectives of Daily Maintenance   (1) Core Principles   1. Prevention first: Replace post-event repairs with regular inspections and preventive maintenance to reduce the risk of sudden shutdowns.   2. Operate in accordance with regulations: Follow the equipment manual and industry standards to avoid secondary damage caused by improper operation.   3. Precise positioning: By integrating monitoring data with sensory judgments (seeing, hearing, touching, and smelling), potential problems can be accurately identified.   4. Full-process record-keeping: Establish maintenance files to record inspection, maintenance and fault handling situations, providing support for subsequent operation and maintenance.   (II) Core Objectives   Ensure that the success rate of unit startup is no less than 99% and the emergency response time is no more than 30 seconds.   2. Maintain the rated power output to prevent power attenuation caused by component aging;   3. Extend the service life of equipment and reduce the failure rate of core components by more than 30%.   4. Reduce operating costs, cut down on fuel consumption, spare parts replacement and unplanned downtime losses.   Ii. Core Contents and Operating Norms of Daily Maintenance   The maintenance of generator sets should cover key components such as engines, generators, and control systems, and be advanced in accordance with a three-level system of "daily inspection + regular maintenance + special inspection".   (1) Daily inspection: Before startup + During operation + after shutdown   Check before startup (5-10 minutes)   - Appearance and environment: Check the firmness of the installation foundation, and ensure that the machine body is not loose or leaking. The computer room is well-ventilated, with the temperature controlled between 5 and 40 degrees Celsius. There is no accumulation of dust or flammable and explosive items.   - Fuel and pipelines: The fuel level in the fuel tank is ≥80%, there is no leakage in the pipelines, and the fuel grade is suitable for the ambient temperature. The oil and coolant levels meet the standards, without turbidity or leakage, and the tension of the fan belt is moderate.   - Electrical system: The battery voltage is normal (12V unit ≥12.5V, 24V unit ≥25V), and the terminal blocks are tight without oxidation. The control system has no fault alarm and the parameter display is normal.   2. Monitoring during operation   - Parameter monitoring: Real-time monitoring of core parameters such as rotational speed (1500r/min), voltage (380V±5%), and frequency (50Hz±1%). Stop the machine immediately in case of any abnormality.   - Status observation: Monitor the operation sound to be stable without any abnormalities, and observe that the smoke exhaust is colorless or light gray.   - Safety Precautions: Ensure that fire-fighting facilities are in good condition and emergency exits are unobstructed. Non-operating personnel are prohibited from approaching.   3. Check after the machine stops   Idle for 3 to 5 minutes and then stop the machine. Record the running duration, power and other data.   Check for any new leaks in the machine body, replenish the oil, and clean the surface dust.   When the machine is out of service for a long time, the fuel valve and the main power switch should be turned off.   (2) Regular maintenance: Carried out based on the operating duration/time cycle   Minor maintenance (every 250 hours or 3 months, whichever comes first)   - Replace the engine oil, oil filter and fuel filter, and drain the water at the bottom of the fuel tank.   Clean the air filter, tighten the battery terminals and check the charging system;   Check the freezing point of the coolant and clean the dust off the radiator.   2. Medium maintenance (every 500 hours or 6 months, whichever comes first)   - Includes all the contents of the minor maintenance;   Clean the fuel tank and pipelines, and check the atomization effect of the fuel injectors.   - Replace the coolant and check the working conditions of the water pump and thermostat;   Check the wear of the belt, clean the control panel and calibrate the accuracy of the instruments.   3. Major maintenance (every 1000 hours or 1 year, whichever comes first)   - Includes all maintenance contents;   - Check the cylinder pressure and valve clearance of the engine, and clean the carbon deposits;   - Test the insulation resistance of the generator winding (≥1MΩ) and check the lubrication condition of the bearings;   Replace the fuel injection pump filter element and test the safety protection functions and the effectiveness of the fire-fighting equipment.   (3) Special Inspection: Adaptation to special environments and working conditions   Extreme environment maintenance   - High temperature (≥35℃) : Strengthen the inspection of the cooling system and shorten the oil change cycle by 20%.   - Low temperature (≤-10℃) : Replace the engine oil, antifreeze and diesel suitable for low temperature, and install an insulation cover for the battery.   - High humidity/high salt: Regularly spray anti-rust agent, enhance insulation protection, and replace corrosion-resistant filter elements;   - Dusty environment: Shorten the replacement cycle of air filters and install dust-proof facilities.   2. Long-term shutdown maintenance (more than 30 days)   - Replace the fuel or add a stabilizer, and change the engine oil and filter element;   Fully charge the battery and disconnect the terminals. Charge it once a month.   Ensure that the cooling system is filled with coolant, cover the unit with a dust cover, and keep the machine room dry and well-ventilated.   Iii. Troubleshooting and Handling of Common Faults   Daily maintenance requires a rapid response to faults to prevent the problem from escalating. The high-frequency faults and their solutions are as follows:   1. The unit fails to start: This is mostly due to low battery power, insufficient fuel, low oil pressure or malfunction of the starting motor. It is necessary to charge or replace the battery, replenish fuel and clean the pipelines, check the oil level, and repair the starting motor if necessary.   2. Immediate shutdown after startup: This could be due to overload protection, abnormal oil or water temperature, fuel interruption, or control system failure. The load should be unloaded, the oil level and fuel filter element checked, and the control system restarted to troubleshoot sensor issues.   3. Abnormal voltage/frequency: Caused by unstable rotational speed, excitation system failure, voltage regulator issue or loose wiring. It is necessary to check the fuel supply and governor, repair the excitation module, calibrate the regulator and tighten the terminals.   4. Abnormal smoke color: Black indicates incomplete combustion. The air filter needs to be cleaned and the fuel injection volume adjusted. Blue indicates burning engine oil. The piston rings and valve oil seals should be inspected and repaired. White indicates coolant leakage. It is necessary to check the cylinder gasket and replace the coolant.   5. Abnormal noise during operation: It is often caused by mechanical loosening, bearing wear, abnormal fuel injection advance Angle or unbalanced fan. It is necessary to tighten the bolts, adjust the belt tension, replace the worn bearings, calibrate the fuel injection advance Angle and inspect and repair the fan.   Iv. Maintenance Safety Regulations and Precautions   1. Safety bottom line: Before maintenance, cut off the power supply, close the fuel valve and hang warning signs. Protective measures must be taken for high-altitude or hot work operations.   2. Tools and spare parts: Use professional tools and select genuine spare parts that match the model.   3. Professional operation: Complex maintenance must be carried out by qualified personnel. Unlicensed operation is strictly prohibited.   4. Environmental protection requirements: Waste oil, waste filter elements, etc. should be stored separately and handed over to professional institutions for treatment. Random discharge is strictly prohibited.   V. Maintenance File Management   Establish a "one machine, one file" archive, detailing the basic information of the equipment, daily inspection records, maintenance contents, fault handling processes, and spare parts replacement information. Through the archives, the status of the equipment can be accurately grasped, the maintenance cycle can be optimized, and data support can be provided for equipment upgrading and replacement.   Conclusion   The daily maintenance of generator sets should adhere to the principle of "prevention first and combination of prevention and treatment", implement the requirements of inspection and maintenance, and flexibly adapt to the working conditions and environment. At the same time, it is necessary to strengthen the training of operation and maintenance personnel and enhance their ability to handle faults, so as to fully play the role of equipment guarantee and provide stable power support for production, life and emergency rescue.

The correct shutdown of the generator set is an important final step in equipment operation and maintenance, directly related to component wear, the reliability of the next start-up and operational safety. Whether it is a normal shutdown or an emergency shutdown, it is necessary to follow the standardized procedures to avoid mechanical damage or safety hazards caused by improper operation. The specific precautions are as follows:   I. Core Processes and Key Points of Normal Shutdown   1. Load unloading in advance: Before shutting down, all electrical equipment should be gradually cut off to ensure that the unit is in a no-load state. This is to prevent the unit from shutting down under load, which may cause sudden voltage changes and damage the generator excitation system or electrical equipment. 2. Idle cooling operation: Do not stop the machine immediately after unloading. Let the unit idle for 3 to 5 minutes (for high-power units, it can be extended to 5 to 10 minutes) to allow the engine water and oil temperatures to drop naturally. This avoids sudden shutdown at high temperatures, which may cause uneven thermal expansion and contraction of components and reduce wear on core components such as cylinders and pistons. 3. Check operating parameters: During idling, reconfirm whether parameters such as oil pressure, coolant temperature, voltage and frequency are normal. Observe for any abnormal conditions such as leakage or unusual noises. If any problems are found, record them and conduct subsequent investigations. 4. Standardized operation shutdown: Shut down the machine normally by pressing the "Shut Down" button on the control panel. After the unit has completely stopped rotating and the cooling fan has stopped rotating, then close the fuel valve (a must for long-term shutdown) and the main power switch. 5. Foundation Inspection after shutdown: Clean the dust and debris on the surface of the unit, check the levels of fuel, engine oil and coolant, and replenish them in time if they are insufficient. Check the machine body for any new leakage points and tighten any loose bolts or terminal blocks.   Ii. Application Scenarios and Operating Norms for Emergency Shutdown   1. Only applicable in special emergency situations: The emergency stop button can only be used in scenarios that may cause equipment damage or safety accidents, such as fire, major leakage (large amount of fuel/coolant leakage), severe abnormal noise, abnormal speed, smoke, etc. 2. Post-emergency shutdown handling: After pressing the emergency shutdown button, the main power supply and fuel valve must be immediately cut off. Only after identifying the root cause of the fault and thoroughly resolving it can the unit be restarted. It is strictly prohibited to repeatedly start the unit without eliminating the fault. 3. Avoid abusing emergency shutdown: Under normal daily operating conditions, the emergency shutdown function must not be used. Frequent emergency shutdowns can disrupt the stability of the unit's operation, leading to insufficient oil lubrication, component impact damage, and shortening the equipment's lifespan.   Iii. Additional Precautions for Special Scenarios and Long-term Downtime   1. Extreme Environment Adaptation - Low-temperature environment (≤-10℃) : After shutdown, it is necessary to check whether the coolant has frozen. If the unit is to be out of use for a long time, the coolant can be drained (or antifreeze suitable for low temperatures can be replaced), and an insulation cover can be added to the battery to prevent freezing damage. - High humidity/high salt environment (coastal areas, ships) : After shutdown, spray anti-rust agent on the metal parts of the fuselage and terminal blocks to prevent corrosion. - Dusty environments (mines, construction sites) : Clean the dust on the surface of radiators and air filters in a timely manner to prevent blockage and affect the heat dissipation effect next time. 2. Long-term shutdown (more than 30 days) : Drain the accumulated water and sediment at the bottom of the fuel tank or add fuel stabilizer to prevent fuel deterioration. Fully charge the battery and disconnect the terminals. Charge it once a month regularly to prevent damage from low battery. Cover the unit with dust covers to keep the machine room dry and well-ventilated, and prevent components from getting damp and rusting.   Iv. Safety and Operational Taboos   1. During the shutdown process, non-operating personnel are strictly prohibited from approaching the unit, especially the rotating parts such as fans and belts, to prevent mechanical injuries. 2. It is strictly prohibited to touch high-temperature components (such as exhaust pipes and radiators) when the unit has not completely stopped running to prevent burns. 3. When maintenance personnel shut down the machine for inspection and repair, they should hang a warning sign that reads "Under maintenance, Do not start", and double-confirm that the power supply and fuel valve have been closed to prevent others from mistakenly starting the machine. 4. Do not modify the shutdown parameters of the control system at will. Strictly follow the equipment manual or the manufacturer's guidance specifications for operation.