Unexplained shutdown of the GE SIS system
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This post was last edited by mattback on 2017-7-6 08:52. The trigger conditions for the large-scale chain were not met, and there are no records of initial alarm occurrences; yet the SIS system shut down automatically. What could be the reason? Jumped out of the car for no reason. The sequence of operation for each large-scale valve is not exactly the same! Thank you all for your guidance. The trigger conditions for large chains are all analog values; everything was fine in the previous year, but suddenly this situation has arisen recently
Your question is too vague; I guess no one can answer it. Please describe the problem in detail so that everyone can help analyze it for you.
Sure, the chain reaction will occur only when the conditions are met; if it’s triggered by an analog signal, there might be temporary issues with the signal, so check the wiring and the instruments on site. Also, as mentioned above, try to provide a more detailed description.
Is the GE SIS on site GMR or MARK VIEs?
It is quite terrifying either when the SIS system malfunctions or fails to function when it should. Check the SIS communication status
If the problem description is more detailed, it will be easier for others to make a judgment. For example, what kind of GE system is used, and what is the interlock mechanism like, etc
The interlock conditions were not triggered, and there are no alarm records; moreover, the trigger signals are all analog. The interlock conditions in your SIS system are quite unusual. It is recommended to check from the perspective of control logic, such as interlock settings and signal isolation performance.
Isn’t the analog signal incorrect? Isn’t the digital signal also derived from an analog signal?
If no trigger record exists, then there should be no record of any action being taken either. Check all the wiring, cables, relays, and solenoids after the DO card.
There are only two reasons for interlock output: one is that the conditions are met, and the other is an accidental failure of the DO card. It is recommended to carefully review the SOE records and alarm records. Go through the interlocks once to see if there are any interlock conditions that you are not aware of and have not been recorded. Replace the corresponding DO card again!