Contactors and relays are the core executive components of the electrical control of cold storage units, and the integrity of their contacts directly determines the stability of unit power supply and start-stop control. Contact erosion, which may seem like mere local wear of components, will actually lead to frequent start-stop or even failure to start of the unit, interrupt the refrigeration cycle, accelerate equipment wear, and lay hidden operational and safety hazards.

The causes of contact erosion are closely related to long-term operating conditions, which are prone to poor contact. Long-term frequent start-stop, current overload, contact oxidation or arc burning will cause contact wear, erosion and even adhesion, leading to unstable or open circuit contact, which in turn triggers abnormal unit control and faults such as frequent start-stop or failure to start.

          Frequent start-stop or failure to start of the unit will induce multiple hazards. Frequent start-stop will accelerate the wear of core components such as compressors and motors, increasing energy consumption and fault risks; failure to start will directly cause refrigeration interruption, temperature rise in the cold storage, threaten the safety of goods storage, and increase equipment maintenance costs and operational losses.

          Standard operation and maintenance require proper protection and detection of contacts: regularly inspect the contact status of contactors and relays, timely clean contact dust and oxide layers to avoid aggravated erosion; control the unit start-stop frequency to avoid current overload; when contact erosion or adhesion is found, replace components in a timely manner to ensure good circuit contact and accurate control.

          Ensuring the integrity of contactor and relay contacts is the key to stable start-stop of the unit. Doing a good job in daily inspection and component replacement can avoid abnormal unit control, maintain continuous refrigeration cycle, extend equipment service life, reduce faults and operational losses, and protect the stable operation of the cold storage.