Questions and concerns regarding the interlock test of the device after maintenance? Everyone is welcome to offer their advice
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As titled: 1. During interlock testing, the AI signal is provided by the instruments; the SIS system can also be used for forced setting (in calibration mode). Why is the value obtained in this way so different from the actual interlock value? If 3500 is given, the corresponding value is 0.3 MPa/2. 2. For the 10-to-2 interlock, how many times do people need to conduct the interlock test? Is it (10*9/2) = 45 times? That’s quite time-consuming; P. What do people usually do in such situations? 3. Regarding the shutdown interlock for the pump, it is required to set it to the test mode before starting up; that is, the DCS motor feedback signal should cause MR** to change color (from green to red), and the control button should change from red to green. What exactly is the purpose of the circuit breaker being in the test mode? Is the inverter located after the circuit breaker? 4. For the CS3000R system, what is the relationship between the interlock values and LL alarm values in the DCS? How did you know that the LL alarm value is the interlock value? Is it possible for the low-low interlock value in DCS to differ from the LL alarm value? How can the interlock alarm value be locked in? 5. What are the functions of the LR and LC modules in the CS3000 system? Which modules are related to interlocking? 6. What are your insights and experiences regarding the organization of interlock testing? How can interlock testing be completed efficiently and quickly before operation begins?
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1 If the value difference is large, it means the conversion was not done correctly. 3 The frequency converter is after the contactor. The 4 LL values are not necessarily interlock values, as alarms are usually meant to alert operators, and it is not necessarily necessary to reach the level of interlock. 6 For testing interlocks, it is not only necessary to check whether the logical output is correct using simulation signals, but it is also essential to go to the site to verify whether the corresponding valves operate and whether the electrical pump receives the interlock signal.
The forced values for interlock tests are based on single-checking; 10 becomes 2. Once the configuration is set, there will be no errors in the program. Trying to test each case individually is something only amateurs would do.
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It is less commonly used for interlocks of 10 taken 2.
Interlocks should be tested for the equipment and electrical components after maintenance.
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Regarding the interlock value and LL mentioned by the poster, to find out whether LL is an interlock value within the system, it can be checked using the search function. The configuration of the interlock logic involves system personnel directly using the LL, HH, H, or L values of a certain parameter for logical configuration, with the design documents serving as the basis for this.