. The signal indicating that the electric valve involved in the interlock has been closed appears, but in reality it hasn’t been closed; this triggers the interlock. What could be the reason?
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. The signal indicating that the electric valve involved in the interlock has been closed appears, but in reality it hasn’t been closed; this triggers the interlock. What could be the reason?
It seems like you’re talking about tongue-twisters; I suggest sending a screenshot of the logic to explain it
There is a gap in the moving parts, the position of the limit switch has changed, or there is a problem with the switch itself. Variation in valve stroke
There might also be an issue with the feedback signal line; is your DI card a card with dry contacts?
The client needs to first explain the logic in detail. First, clarify what the conditions for interlocking are, and then determine who triggers the interlock. Generally, valves are the objects that trigger something, and it is rare for a valve position signal to serve as the triggering condition. There is a valve position feedback signal, which is also used to confirm whether the interlock device is functioning properly. I need to clarify what the conditions are again
The information provided by the poster is too limited; there are many possible explanations, but it’s unlikely to be of much help to you. It is recommended to provide a detailed description of the phenomenon along with the valves and control systems present at the site.
It’s hard to understand; I don’t get what the original poster means.