Abstract: In order to solve the trip problem of breaker system of the instrument control equipments in the case of impact situation, PDCA cycle which based on the OEC (overall every control and clear) was conducted to identify the main reason of the problem, and the appropriate disposal programs were screened out. Results show that the trip phenomenon is caused by the lower ability of breaker system in resisting impact behaviors which consequently results in the stronger vibration intensity. Therefore, a mounting bracket which contains vibration isolator was designed, finite element analysis was carried out to simulate the impact behavior of the breaker system and proved the reliability of the program. In addition, experimental test was performed to verify the effectiveness of the disposal program, which experimentally indicated the ability of breaker system in resisting impact was improved significantly. This results prove that the PDCA cycle plays a significant role in designing and improving the instrument control equipments as well.

Key words: instrumentation; breaker; PDCA cycle; impact