1、 Daily use and maintenance

1. environmental control
   • Temperature managementKeep the working temperature within the module specification range (usually -10 ℃~+50 ℃) and avoid being close to heat sources (such as radiators, transformers) or direct sunlight. High temperature can accelerate component aging, while low temperature may lead to cold start failure.
   • humidity controlRelative humidity is recommended to be ≤ 85% to prevent condensation from entering the interior of the module. In humid environments, dehumidification devices can be installed or sealed enclosures can be used.
   • Dust and dirt preventionRegularly clean the surface dust of the module (once a week) and avoid using corrosive cleaning agents. For environments with high levels of dust (such as factories), dust nets can be installed and replaced regularly.
   • Ventilation requirementsEnsure there is sufficient heat dissipation space around the module (leaving at least 10cm gap) to avoid blocking the air vents. When multiple modules are used in parallel, they need to be arranged in intervals or equipped with cooling fans.
2. Load management
   • Avoid overloadingStrictly use the module according to its rated power (such as 100W) and current (such as 10A), and prohibit long-term overload operation. Overload can cause module overheating, performance degradation, and even damage.
   • Light load protectionSome modules may not be able to output stably under light loads (such as load current<10% of rated value), and this issue needs to be resolved through false loads or adjusting the output range.
   • Dynamic load testingRegularly (once a month) simulate actual working conditions with a variable load meter and check the dynamic response capability of the module (such as output voltage fluctuations of ≤± 1%).
3. Input power management
   • voltage stabilityEnsure that the input voltage is within the allowable range of the module (such as AC 85V~265V or DC 18V~36V), and avoid frequent fluctuations. Can be equipped with a voltage regulator or UPS power supply.
   • Anti reverse connection protectionWhen connecting the input power supply, confirm that the polarity is correct. Some modules have built-in reverse connection protection circuits, but frequent reverse connections may still damage components.
   • Lightning protection measuresIn areas prone to lightning, surge protectors (SPDs) need to be installed at the input end to prevent voltage surges from damaging the module.

2、 Regular maintenance and inspection

1. Visual inspection
   • Shell integrityCheck the module casing monthly for cracks, deformations, or burnt marks, especially on the heat sink section.
   • Connector statusCheck if the input/output terminals are loose, oxidized, or burned. When oxidation is detected, clean the contact surface with an alcohol swab and apply conductive paste.
   • Indicator light statusConfirm that the power indicator light (such as green) and fault indicator light (such as red) are displaying normally. Abnormal flashing may indicate an internal malfunction.
2. Electrical performance testing
   • Output voltage calibrationMeasure the output voltage quarterly using a high-precision multimeter (such as a 6.5 digit meter) and compare it with the nominal value. When the error exceeds ± 0.5%, it needs to be adjusted or repaired.
   • Ripple and noise testingMeasure the ripple voltage at the output terminal (usually ≤ 50mVpp) using an oscilloscope (bandwidth ≥ 100MHz). Excessive ripple may be caused by capacitor aging or improper layout.
   • efficiency testMeasure the input power (P_in) and output power (P_out) at rated load, and calculate the efficiency (η=P_out/P_in). A decrease in efficiency of more than 5% may indicate component aging.
3. Maintenance of cooling system
   • Fan cleaningFor air-cooled modules, clean the fan dust every 3 months (using compressed air or a soft bristled brush) and check the lubrication of the bearings. Fan failure can cause module overheating protection shutdown.
   • Replacement of heat dissipation pasteFor modules sealed with thermal conductive silicone grease, replace the heat dissipation paste (such as Xinyue 7921) every 2 years to ensure thermal conductivity efficiency.
   • Temperature sensor calibrationSome modules have built-in temperature sensors, and infrared thermometers need to be used regularly to compare the actual temperature. Calibration is required when the error exceeds ± 2 ℃.

3、 Fault prevention and handling

1. Common faults and causes
   • No output voltagePossible causes include blown input fuse, damaged switch tube, or control circuit malfunction.
   • Low output voltagePossible reasons include feedback resistance drift, decreased output capacitance, or excessive load.
   • Frequent triggering of overheating protectionPoor heat dissipation, high ambient temperature, or excessive load current.
   • noise anomalyInductive howling may be caused by switch frequency resonance, and it is necessary to adjust the layout or install absorbing materials.
2. Fault handling process
   • Power off inspectionFirst, disconnect the input power and use a multimeter to measure if the input voltage is normal.
   • static testingCheck whether key components (such as MOSFETs, diodes) are short circuited or open circuited.
   • dynamic testingGradually increase the current under low load and observe the changes in output voltage and temperature.
   • Professional repairIf it cannot be repaired by oneself, it is necessary to contact the manufacturer or authorized repair point to avoid expanding the fault.
3. Spare Parts Management
   • Backup of key componentsReserve commonly used vulnerable parts (such as fuses, electrolytic capacitors, fans) to shorten maintenance time.
   • Firmware updateFor digital control modules, regularly check the firmware updates released by the manufacturer, fix known vulnerabilities, or optimize performance.