# PID Loop

Captain O Captain
Published on 2020-10-12
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1. Introduction

The desired state of something is referred to as a setpoint (temperature, pressure, humidity, etc.). This is usually a steady function, such as a room temperature of 70°F, a room positive pressure of 0.03"" W.C., or a relative humidity of 40-60% rh.

PID math is then used to compensate for changes in equipment or processes, such as weather or if a door is left open. The procedure is looped back and replayed after a change is detected, adaptations are made, and the process is looped back and again. More commonly, PI loops (without the Derivative component) are used.

2. What is PID Loop

To turn damper actuators and hydronic reheat valves in HVAC systems, numerous motors and equipment must be controlled with modulated signals. Most controllers in the industry use a Proportional Integral Derivative (PID) controller, often known as a PID Loop, to do this. PID is a type of mathematical logic that allows these three functions to be modified as parameters, allowing equipment to perform properly and ideally.

3. How to Create a P&ID

Step 1: Define the system's scope.
Do you need to understand the overall process before drawing a P&ID? What does it accomplish?

Step 2: Make a list of the inputs.
Is it a manual or an automatic system? Where do the inputs come from and where do they lead?

Step 3: Determine the outcomes
What is the final result? What are you going to need to make it happen?

Step 4: Make a list of all the equipment involved in the process.
Consider the instruments, control devices, pipelines, and other machinery.

Step 5: Define the components' relationships.
What is their relationship like? Are they a good match?

Step 6: Put your flow together.
Start at the beginning or conclusion of the procedure and work your way through it step by step. What is the next step in the system?

Step 7: Fill in the details
Details on the pipe, component, and instruments, such as measures and diameters, should be added.

Step 8: Go over the steps again.
Keep an eye out for inefficiencies and bottlenecks.
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PID
Process Flow Diagram
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