CONTROLLER SWITCHING-B
Determine if a control loop is in or out of control and explain why it is in or out of control when the following indicators arc observed:
• The control loop is in control if all elements of the loop arc yielding the desired process result (auto, closed loop).
• If the process result is off from what is desired, what indicator shows an out of control condition? Possible places in a loop where the malfunction could exist include: the primary element, transmitter, controller, and/or final control element.
• The process technician must troubleshoot the cause of the problem.
• Placing the problem element on manual control can help regain control of the process.
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