Analysis of Causes and Implementation of Countermeasures for Main Switch Failures
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Analysis of Causes and Implementation of Countermeasures for Main Switch Failures
| Failure | Assumed cause | Countermeasure | |
|---|---|---|---|
| Failure in electrical characteristics | Contact failure | Foreign matter is attached to the contacts. | Use sealed switches to prevent the entry of foreign matter. |
| Films forming on contact surfaces | Use switches with gold contacts, which have wiping effects. | ||
| Insufficient contact force between the contacts caused by an incorrect stroke. | Set a suitable stroke. | ||
| Malfunction | Contact chattering caused by vibration or shock. | Use switches with large contact forces between the contacts (i.e., with a high operating force (OF)). | |
| Welding | The switching capacity of the contacts was exceeded. | Use a high-capacity switch. Insert a contact protection circuit. |
|
| Insulation deterioration | The contacts are spattering due to arcing. | Use a high-capacity switch. | |
| Failure in mechanical characteristics | Failure to operate | The mechanism is damaged due to an incorrect stroke, overload, or shock. | Set a suitable stroke and operate the switch at a suitable operating speed and with a suitable load. |
| Foreign matter has entered the switch and is caught in the mechanism or contacts. | Use sealed switches to prevent the entry of foreign matter. | ||
| External damage | An overload was placed on the actuator because of the dog or cam shape or because an unsuitable operating method was used. | Change the design of the dog or cam and use suitable operating methods. | |
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