The purpose of abnormal operation test of air expansion shaft is to improve the reliability of the system and avoid unnecessary accidents as far as possible. The abnormal operation test can be carried out as follows: 

    1. Sudden external power-off experiment. When the equipment is in manual or automatic operation, no matter under what circumstances, it can be reliably stopped for external sudden power failure, and the equipment can be restored to normal operation through the prescribed operation procedures.

   2. Emergency breaking test. When the equipment is in manual or automatic operation, no matter under what circumstances, for emergency interruption operation, the equipment can be reliably stopped, and the normal operation can be restored through the prescribed operation steps.       

    3.Test for defective switch. The possibility of bad system detection switch shall be considered, especially for the parts which are easy to generate mechanical part collision, interference and affect safety, abnormal test shall be conducted for signals such as travel end detection, and it must be ensured that no safety accident will occur even if a certain detection switch is bad or damaged.

    4. Bad test of actuating element. The possibility of poor performance of system actuating elements shall be considered, especially for the actuating elements that are prone to mechanical collision, interference and affecting safety, abnormal test shall be carried out to ensure that no safety accident will occur even if a certain actuating element is poor or damaged.

    5.  Protection circuit action test. The possibility of system protection circuit action shall be considered, especially for circuit breakers, automatic switches and other protective devices, abnormal tests shall be carried out to ensure that when the protective devices act, the equipment can be reliably stopped, and the normal operation can be restored through the specified operation steps.

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