What is the reason why the air compressor displays too low voltage

Technical analysis report on abnormal voltage of compressed air system

During the operation of the compressed air system, it is a common technical situation that the equipment control panel appears with abnormal voltage warnings. After systematic analysis, such problems mainly stem from the following four technical dimensions, and enterprises can conduct targeted inspections and treatment based on actual working conditions:

1. Technical analysis of power input system

1. Power supply stability testing: When the regional power grid voltage is more than 20% lower than the equipment rating, the low-voltage protection mechanism will be triggered. It is recommended to use professional instruments to measure the output voltage of the distribution box. If the measured value continues to be lower than the nominal voltage of the equipment, it is necessary to coordinate with the power supply department to optimize the quality of the power grid.
2. Line transmission loss evaluation: The length of the power supply line exceeds the standard value or the line diameter is small, which will cause the line resistance to increase. It is estimated that when the line voltage drop exceeds 5%, the terminal equipment will experience insufficient voltage, and line modification or additional compensation devices will be required.

2. Diagnosis of technical status of equipment body

1. Detection module verification: Parameter drift of voltage sampling circuit components or control panel program errors may cause deviation between the displayed value and the actual value. The voltage sensor can be calibrated through professional equipment and the control unit firmware can be updated if necessary.
2. Status inspection of protective devices: Abnormal action of protective elements such as thermal relays and fuses may indirectly trigger abnormal voltage warnings. The action threshold and response time of the protective device need to be regularly checked.

3. Dynamic impact of power grid environment

1. Voltage fluctuation adaptability: Industrial power grids often produce ±10% voltage fluctuations due to the start-up and shutdown of high-power equipment. Frequency conversion drive equipment can enhance its adaptability by adjusting the carrier frequency. It is recommended to install dynamic voltage restorers for power frequency equipment.
2. Response to sudden changes in load: 3 – 5 times the instantaneous current generated during equipment startup may cause bus voltage drop. Optimizing the starting sequence or adding a soft starting device can effectively alleviate such problems.

4. Operation status of auxiliary system

1. Air filtration system maintenance: Blocking of the intake filter will cause abnormal compression ratio. Although it does not directly cause voltage problems, it may increase the operating load of the equipment. It is recommended to clean or replace the filter element every 2000 hours.
2. Heat dissipation system effectiveness verification: Equipment overheating caused by cooling system failure may cause erroneous protection actions of the control system. It is necessary to regularly check the status of the radiator and the working accuracy of the thermostat valve.

Technical treatment suggestion process:

1. Priority should be given to power quality testing, and use a multimeter with three and a half digits or more accuracy to measure the voltage at the input of the equipment.
2. Check the reliability of the power line connection, focusing on checking hidden dangers such as oxidation and loosening of connection terminals
3. Implement the control unit self-test procedure to check the consistency of the system parameters with the factory settings
4. Install a power quality monitoring device on the front end of the distribution cabinet to record 72 hours of operation data
5. Select a technical plan based on the monitoring results: use a voltage stabilizing device when the quality of the power grid is not up to standard, implement line transformation when the line loss is excessive, and contact professional maintenance when the equipment body fails

Preventive maintenance measures:

1. Establish a regular inspection system for the power supply system and conduct quarterly voltage quality analysis
2. Improve the equipment operating environment and ensure that the temperature and humidity of the distribution room comply with GB/T 14048 standard
3. Implement special training for operators to standardize equipment start-up and shutdown processes and parameter settings
4. Build a spare parts system and reserve key testing components and protection devices

Enterprises can formulate special solutions based on the above technical analysis framework and combined with on-site conditions. For complex technical issues, it is recommended to entrust professional institutions with metrology certification qualifications to conduct in-depth testing to ensure the stable operation of the compressed air system.