One common issue with contactors is unreliable contact, which can lead to poor performance and potential equipment failure. When the contact resistance between the moving and stationary contacts increases, it causes excessive heat at the contact surface, leading to a transition from surface contact to point contact or even complete loss of contact during operation. This can result in intermittent or failed circuit connections. The main causes of this problem include:
1. Contamination on the contact surfaces, such as oil, dust, or foreign particles.
2. Oxidation of the contact surface over time due to long-term use.
3. Arc erosion caused by repeated switching, which may create defects, burrs, or metal debris on the contact surface.
4. Mechanical jamming in the moving parts of the contactor, preventing smooth operation.
To address these issues, the following repair methods are recommended:
1. For minor contamination like oil, dirt, or foreign objects, gently clean the contacts using a soft cloth, alcohol, or gasoline. Be careful not to damage the contact surface during cleaning.
2. If the contact is made of silver or a silver-based alloy, oxidation or slight burning caused by arc activity is usually normal and does not significantly affect performance. You can clean the surface with alcohol, gasoline, or carbon tetrachloride. Even if the contact surface becomes uneven or slightly burnt, you can carefully remove any splatter or burrs using fine sandpaper. Avoid over-sanding, as this may reduce the lifespan of the contacts.
For copper contacts, light burns can be repaired by gently smoothing out any irregularities with a fine file. However, avoid using abrasive cloths, as they may leave behind grit that could interfere with proper contact. If the burn is severe and the contact area has been significantly reduced, it’s best to replace the contact entirely.
3. If the moving parts of the contactor are jammed, disassemble the unit for inspection and maintenance. Lubricate moving components where necessary and ensure all parts move freely to prevent future issues.
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Foshan Nanhai Jinfancheng Metal Building Materials Products Co., Ltd. , https://www.landrandoor.com