1、 Daily inspection and visual inspection

1. Shell integrity
   • Check the relay housing for damage, deformation, or cracks to prevent internal components from being exposed to harsh environments.
   • Confirm that the enclosure has good sealing to prevent dust and moisture from entering and causing short circuits or electrical leakage.
2. Inspection of connection parts
   • Check if the wiring terminals are loose, oxidized, or rusted. Loose terminals need to be tightened, while oxidized or rusted terminals can be polished with sandpaper or cleaned with specialized cleaning agents, and coated with conductive paste to improve contact performance.
   • Ensure that all fasteners (such as screws and nuts) are securely fastened to prevent poor contact or short circuits caused by looseness.
3. Indicator lights and display screen status
   • Observe whether the indicator light is on or flashing normally, and whether the display screen values are accurate. Abnormalities may indicate a malfunction and require further investigation.

2、 Regular cleaning and dust prevention

1. Shell cleaning
   • After cutting off the power, wipe the dust on the surface of the shell with a dry soft cloth. Stubborn stains can be cleaned with neutral cleaning agents, but liquids should be avoided from entering the interior.
2. Internal component cleaning
   • For detachable models, after opening the casing, use compressed air to blow away internal dust, paying attention to maintaining distance and angle to avoid damaging components.
   • Precision components (such as contacts and coils) can be cleaned with specialized electronic cleaning agents to ensure a smooth and oxide free surface of the contacts, guaranteeing contact performance.
3. dustproof measures
   • When not in use for a long time, store the relay in a dry, ventilated, and non corrosive gas environment to avoid high temperatures, humidity, or strong magnetic fields.
   • In outdoor or harsh environments, use sealing materials to prevent moisture and dust from entering.

3、 Parameter testing and performance evaluation

1. Action Test
   • Use a relay comprehensive testing bench or professional instruments to test parameters such as contact continuity, action synchronization, and coil resistance.
   • For example, test the rated voltage and minimum/maximum operating voltage before action; Test the contact resistance of the contacts after the action (new relay ≤ 20m Ω, after use ≤ 1 Ω).
2. Insulation performance testing
   • Measure the insulation resistance with a megohmmeter to ensure compliance with the equipment manual requirements. If the insulation resistance value is lower than the standard, it is necessary to check for moisture or aging, and take drying treatment or replace the insulation components.
3. life assessment
   • Adjust the replacement cycle according to the usage environment:
     • Under harsh working conditions such as high temperature, high humidity, and vibration, it is recommended to replace all parts after 3 years of use or when there are multiple malfunctions.
     • Under normal operating conditions, critical circuits can be replaced after 4 years of use, while other circuits can be extended to 5 years.
     • Under good working conditions, it is recommended to replace all relays that have been in use for more than 5 years.

4、 Maintenance records and troubleshooting

1. Establish and maintain archives
   • Record the time, results, and handling measures of each inspection, cleaning, and testing to facilitate tracking of equipment status and optimizing maintenance plans.
2. Fault relay handling process
   • Remove the faulty relay and mark the train number, circuit, fault symptoms, and date.
   • Fill out the 'Fault Relay Information Record Form' and return it to the manufacturer for analysis along with the relay.
   • Common faults and solutions:
     • Contact burnoutCheck if the load circuit current exceeds the standard, or contact the manufacturer's technical support.
     • Power on without actionCheck if the input voltage and resistance of the coil are within the required range.
     • The circuit is not conductingCheck the circuit connection and contact status of the contacts.

5、 Storage and handling precautions

1. storage environment
   • Temperature range: -20 ℃ to+70 ℃; Relative humidity: ≤ 85%.
   • Avoid storing in environments with corrosive gases, strong magnetic fields, or vibration sources.
2. Handling standards
   • Handle with care, avoid severe vibrations or impacts, and prevent damage to internal components.