Aug 28, 2021 · The interlock would make the state of the two mechanisms mutually dependent, the major purpose of an interlock system is to protect the machine and the operator. The interlock would protect the machine and this would be done by preventing one element from changing state because of the state of the other element.

Jun 10, 2025 · Detailed Explanation of BFP Trip Logic – Interlock and Logic Schematic. The start permissive and trip logic for a 43 MW captive power plant’s boiler feed pump (BFP) unidirectional drive system is depicted in this interlock and logic diagram.

Jan 30, 2023 · Causes can include a change in the state of a digital input, a High High/Low Low alarm from an analogue input, and interlock logic, among other things. Effects can include tripping a motor or pump, closing a valve, opening a pressure relief valve, activating an emergency alarm, Beacon/Hooter, and so on. Detailed Explanation of Cause & Effect ...

Apr 28, 2004 · On any given interlock you shut off the feeds, open the nitrogen, and maybe do a couple other things. You can approach these two types seperately. For the SISO interlocks its usually most efficient to physically test the input devices and watch the output function correctly.

Nov 27, 2002 · An interlock is a condition or series of conditions that must be met to allow an operation or process to continue. Examples are numerous, but some general examples include: shield interlock- the machine cannot run unless all the safety shields are closed flow interlock - the operation cannot continue unless the coolant flow is adequate

Jan 24, 2023 · Process Functionality Description (Interlock and sequence): Sequence descriptions are step-by-step procedures that explain how the unit works. A. Sequence Area. 1. Sequence Set Points. a. Sequence Steps. Interlocks are any corrective actions that are meant to protect the product, people, or equipment.

Aug 31, 2023 · In this article we will discuss about creating an appropriate PLC program for a sequence of three motor connected with interlock. Three Motors say M1, M2 & M3 are connected in a sequence. Once the start button pressed, the M1 start running and stay for 5 secs then M2 start and stay for 5 sec then M3 Start and stay for 5 sec.

May 8, 2025 · Interlock resets; Check the behavior of the PID control loop: Set a fixed Set Point; Vary the Measured Variable; Observe the controller output; Make sure the process design matches the controller action (direct or reverse). Such as: In direct acting, when PV rises above SP, the control valve should open more.

Jun 16, 2012 · Process Interlock : Something that prevents incorrect operation or possible damage to the process or equipment. Safety Interlock : Something that prevents possible damage or death to people operating that process or equipment. DCS and many PLC systems are not considered reliable enough for you to risk your life on.

Jun 25, 2024 · Steam Turbine Interlock Scenarios and Management . In a thermal power plant, turbine interlocks are crucial safety mechanisms designed to protect the turbine and its associated systems from damage due to abnormal operating conditions.