# Asdf Essay

958 WordsApr 20, 20154 Pages
Mechanical Control Systems MECH 4450 Lab 4 On/off, PID temperature control Instructor: Alan Inglis Dan Hoeller, Set J, A00857973 Chris Racz, Set J, A00692816 INTRODUCTION In lab # 4 “On/ off and PID Temperature Control”; we looked at how proportional, proportional-integral, proportional-integral-derivative control will effect on/off systems. PID controllers will allow give you the most accurate control of your system. Simple on/off temperature controllers can control a temperature within a range, by being on until the system reaches an upper set point before switching to the off position. This works well except for the time gap between when the upper set point is reached and when the system goes into the off position. This will cause the system to overshoot the upper set limit. This is why other methods of temperature control need to be looked at. In this lab we will calculate and program temperature sensor transfer functions, and observe how the proportional controller gain will affect the performance of the controller. PART E: On/Off Control I/O Listings | Mnemonic | Address | Description | Inputs | LM35_count | Local:6:I.ch0Data[C] | Temperature sensor | Potentiometer_count | Local:6:I.ch1Data[C] | Potentiometer voltage | Compute/Math | CPT | | Compute command | Greater Than (A&gt;B) | | Greater than gate | Binary Bits | setpoint | | System set point | temperature | | System temperature | error | | Error between set point and temp. | Relay | Local:5:O.Data.5 | Internal output relay | Outputs | Relay | Local:5:O.Data.5 | Output relay to heating element | Discussion: This Circuit is designed to control a heating element via an on/off control circuit. The control circuit utilized two sensors; the LM35 temperature sensor, and a potentiometer to measure input voltage. The input voltage runs between