Consider the system of five tanks that are supplied with liquid by a single feed pump. Each of the tanks has a level transducer and an on/off inlet valve. The interlock system is designed to work according to the following logic. If the level in the tank exceeds a predefined upper limit value, then its inlet valve is locked to a closed position. The feed pump is locked closed if all the inlet valves are closed (feedback provided by closing a limit switch) and any of the predefined level upper limit values of the tanks is reached.
1. Please make the logic solver diagram using the logical gates.
2. Please describe the operation of the interlock system.
3. Please describe the operation of the interlock system when one of the level upper limit transducer fails due to a low signal.
4. Please describe the operation of the interlock system when one inlet valve limit switch fails (i.e. remains in an opened switch position).
5. Provide a safer design for the interlock system.
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