QNET Heating and Ventilation Trainer Workbook
Contents
1. so Control Parameters Yh amp 3 2 50 ATh J 0 25 O N WoO Ft OOD ws Ow Lc SE NESS TESST LER Sa ES cf TERE ES Pal a Figure 2 4 Calibrating the temperature in the QNET HVACT On Off Control VI 2 4 Lab 1 Relay Control 30 min 1 Make sure the QNET HVACT On Off Control vi is running and has been calibrated as instructed in Section 2 3 When running the VI should look similar to Figure 2 3 2 In the Signal Generator section set Q QUANSER e Amplitude 0 C e Frequency 0 008 Hz e Offset 0 5 C 3 Examine the actual temperature red and reference temperature blue responses in the Temperature C scope 4 Gradually vary the Offset in the Signal Generator between 0 5 C and 2 C How is the reference temperature Tr in the Temperature C scope is set Attach a sample temperature response 5 Vary the relay amplitude Vh amp in the Control Parameters section Explain how the heater voltage affects the temperature variation and in particular observe the frequency and amplitude of the chamber temperature Attach a representative temperature response 6 Explain the effect of changing the relay mean Vh_off Attach a temperature response 7 Examine the effects of changing the relay width or hysteresis DTh between 0 01 C and 1 00 C Give a short explanation and attach a temperature response with a narrow and wide hysteresis 8 Click on the Stop button to stop running the VI 2 5 La2. 1 Low and high proportional gain temperature responses in Step 5 in Section 3 4 Low and high integral gain temperature responses in Step 6 in Section 3 4 High reset time temperature and heater voltage response in Step 4 in Section 3 5 Low reset time temperature and heater voltage response in Step 6 in Section 3 5 Temperature and heater voltage response with set point weight of 0 in Step 4 in Section 3 6 Temperature and heater voltage response with set point weight of 1 in Step 6 in Section 3 6 of OS amp by Temperature and heater voltage response with designed PI gains in Step 4 in Section 3 7 lll ANALYSIS Provide details of your calculations methods used for analysis for each of the following 1 Effect of increasing reset time parameter in Step 4 in Section 3 5 2 Effect of decreasing reset time parameter in Step 6 in Section 3 5 IV CONCLUSIONS Interpret your results to arrive at logical conclusions for the following 1 Performance of designed PI control response in Step 4 in Section 3 7 NET HVACT Workbook Student Version Ea 5 3 Tips for Report Format PROFESSIONAL APPEARANCE e Has cover page with all necessary details title course student name s etc e Each of the required sections is completed Procedure Results Analysis and Conclusions e Typed e All grammar spelling correct e Report layout is neat e Does not exceed specified maximum page limit if any e Pages are numbered e
3. Control ie L Device Sampling Rate Hz 1 7 INSTRUMENTS 5 J 4 Devl 1 100 0 16 Temperature C gt QNET HVACT PI Control Setpoint 9 Measured A Digtal Scopes chamber Temp a1 gt Temp EM E 3 Signal Generator Signal Type A 5 Amplitude J 0 50 6 z Frequency ge 0200 Be 4 Hz Voltage Y Offset 1 50 8 c 10s Control Parameters kp 54 00 9 ki 0 500 10 bsp 1 00 Ja 11 Se 49 Figure 4 2 QNET HVACT PI Control VI components QNET HVACT Workbook Student Version v 1 0 ID Label Symbol Description Unit 1 Chamber Temp T Temperature inside chamber numeric C D Dia a Ambient Temp Temperature outside chamber numeric C display i e measured room tempera ture Latched ambient temperature that is C added to reference temperature from Signal Generator Calibrate Sets the red latched ambient tempera ture to the measured ambient tempera ture Signal Type Type of signal generated for the input D D SEE Amplitude Generated temperature reference signal C BBS E 7 Frequency Generated temperature reference signal Hz Ee ESS a Offset Generated temperature reference signal ge p E rene re Controller proportional gain input box Controller integral gain input box V C s Fit bsp Fog T Controler set point weight input box ee ee 7 Anti windup tracking time constant a Eea Scope with reference temperature blue and measured chamber ORA ture in red Voltage V
4. Equations are consecutively numbered e Figures are numbered axes have labels each figure has a descriptive caption e Tables are numbered they include labels each table has a descriptive caption e Data are presented in a useful format graphs numerical table charts diagrams e No hand drawn sketches diagrams e References are cited using correct format O GUA NS ER REFERENCES 1 Quanser Inc QNET Heating Ventillation Control Trainer User Manual 2011 2 Quanser Inc QNET Practical Control Guide 2011 Six QNET Trainers to teach introductory controls using NI ELVIS gt QNET DC Motor Control Trainer gt QNET HVAC Trainer gt QNET Mechatronic Sensors Trainer teaches fundamentals of DC motor control teaches temperature process control teaches functions of 10 different sensors TAA as W m mkn Gelade ETERN gt QNET Rotary Inverted gt QNET Myoelectric Trainer gt QNET VTOL Trainer Pendulum Trainer teaches control using principles of teaches basic flight dynamics and control teaches classic pendulum control experiment electromyography EMG Quanser QNET Trainers are plug in boards for NI ELVIS to teach introductory controls in undergraduate labs Together they deliver added choice and cost effective teaching solutions to engineering educators All six QNET Trainers are offered with comprehensive ABET aligned course materials that have been developed to enhance the student learning experi
5. HVACT The temperature measured at the thermistor inside the chamber is to be controlled using the heater voltage while the fan is ran at a constant speed Heat is transferred to the thermistor by radiation from the heater and by convection from the air stream Radiative heat transfer is highly nonlinear and it is therefore difficult to model the system by first principles As a result empirical tuning will be used to control the system This heat transfer plant is very similar to the systems that are used to control wafer temperature in semiconductor manufacturing There are two experiments on off control and PI control The experiments can be performed independently Topics Covered e On off control e Modeling e PI control e Integrator windup e Set point weight Prerequisites In order to successfully carry out this laboratory the user should be familiar with the following e Transfer function fundamentals e g obtaining a transfer function from a differential equation e Using LabVIEW to run VIs e ON OFF CONTROL 2 1 Background 2 1 1 Relay Control On off control or relay feedback is one of the simplest control strategies The heater is switched on when the temperature is lower than the desired value and the heater is switched off when the temperature is higher than the desired value To avoid rapid switches it is common to introduce a hysteresis in the relay switch A block diagram of a system with relay feedback is s
6. PI reg ulator Table 1 Files supplied with the QNET HVACT Laboratory 4 2 On Off Control VI The HVACT On Off Control VI implements a relay to control the temperature of the chamber This VI can also be used to model the dynamics between the heater voltage and the temperature Table 2 lists and describes the main elements of the QNET HVACT On Off Control virtual instrument user interface Every element is uniquely identified through an ID number and located in Figure 4 1 gt QNET HVACT PI Control QNET HVACT PI Control reser on NATIONAL Device Sampling Rate Hz 1 7 1 8 BY INSTRUMENTS Devi 15 100 0 16 Setpoint A Measured A Temperature C Digital Scopes 25 113 Chamber Temp 1 gt Temp EM c C3 Signal Generator Signal Type mA 5 Amplitude 0 50 6 E Frequency 930 0200 7 Hz voltage Y Heater Input Voltage Offset 1 50 8 c Control Parameters kp 514 00 9 ki 0 500 1 Qs bsp J 1 00 Tr J o 4 2 Figure 4 1 QNET HVACT On Off Control VI components QNET HVACT Workbook Student Version v 1 0 ID Label Symbol Description Unit Chamber Temp Temperature inside chamber numeric C n poa o n a Ambient Temp Temperature outside chamber numeric display i e measured room tempera ture Latched ambient temperature that is C added to reference temperature from a a Signal Generator Calibrate Sets the red latched ambient tempera ture to the measured ambient tempera ture
7. QNET_ HVACT PI Control vi is running and has been configured as described in Section 3 3 2 In the Signal Generator section set e Amplitude 0 5 C e Frequency 0 02 Hz e Offset 1 5 C 3 In the Control Parameters section set kp 8V C e ki 1 V C s e bsp 0 e Tr 1s 4 Examine the response of the measured temperature in the Temperature C scope as well as the input heater voltage in the Voltage V scope Attach the temperature and heater voltage responses 5 Try the controller with a set point weight of 1 6 Study what effects raising bsp has on the measured temperature signal in the Temperature C scope and the control signal shown in the Voltage V scope Capture the temperature response and its corresponding heater voltage 7 Click on the Stop button to stop running the VI 3 7 Lab 4 PI Control according to Specifications 30 min 3 7 1 Pre Lab Questions 1 Find the proportional and integral gains i e kp and k needed for the response to satisfy the following speci fications e 0 60 e wo 0 125 rad s Use the model gain K found previously in Section 2 5 and the design principles outlined in Section 3 1 3 7 2 In Lab Exercises 1 Ensure the QNET_ HVACT PI Control vi is running and has been configured as described in Section 3 3 2 Inthe Signal Generator section set e Amplitude 0 5 C NET HVACT Workbook Student Version aa e Frequency 0 02 Hz e Offset 1 5 C 3
8. would like to thank the following contributors Dr Hakan Gurocak Washington State University Vancouver USA for his help to include embedded outcomes assessment and Dr K J str m Lund University Lund Sweden for his immense contributions to the curriculum content Contents QUAN 1 2 A S ER Introduction On Off Control 2 1 Background 2 2 On Off Control Virtual Instrument 2 3 Startup 10 min 2 4 Lab 1 Relay Control 30 min 2 9 Lab 2 Modeling 30 min PI Control 3 1 Background 3 2 Speed Control Virtual Instrument 3 9 Startup 10 min 3 4 Lab 1 Qualitative PI Control 30 min 3 0 Lab 2 Saturation and Windup 30 min 3 6 Lab 3 Set Point Weight 20 min 3 7 Lab 4 PI Control according to Specifications 30 min System Requirements 4 1 Overview of Files 4 2 On Off Control VI 4 3 PI Control VI Lab Report 5 1 Template for Content On Off Control 5 2 Template for Content PI Control 5 3 Tips for Report Format 1 INTRODUCTION The QNET 012 heating and ventilation trainer HVACT is shown in Figure 1 1 The system consists of a plexiglass duct with a heater in one end and a blower in the other end The heater is a halogen lamp and the blower is a variable speed fan There is a thermistor sensor placed inside the duct to measure the temperature of the chamber and another thermistor sensor outside the chamber to measure the room temperature Figure 1 1 QNET heating and ventilation trainer
9. Enter the control gains obtained in the pre lab in the Control Parameters section of the VI 4 Examine the measured temperature response using your design PI gains How is the performance of the controller compared to the previous controller Attach the temperature and the heater voltage responses 5 Click on the Stop button to stop running the VI A GUA NS ER 4 SYSTEM REQUIREMENTS Required Hardware e NI ELVIS II e Quanser QNET Heating and Ventilation Trainer HVACT See QNET HVACT User Manual 1 Required Software e NI LabVIEW 2011 or later NI DAQmx 9 3 5 or later e NI LabVIEW Control Design and Simulation Module 2011 or later e ELVIS II Users ELVISmx 4 3 or later installed from ELVIS II CD E Caution If these are not all installed then the VI will not be able to run Please make sure all the software and hardware components are installed If an issue arises then see the troubleshooting section in the QNET HVACT User Manual 1 4 141 Overview of Files File Name CCC Description Z o QNET HVACT User Manual pdf This manual describes the hardware of the QNET Heat ing and Ventilation Trainer system and how to setup the system on the ELVIS QNET HVACT Workbook Student pdf This laboratory guide contains pre lab questions and lab experiments demonstrating how to design and implement controllers on the QNET HVACT system LabVIEW QNET HVACT PI Control vi Control temperature using a proportional integral
10. Q NATIONAL A INSTRUMENTS QUANSER STUDENT WORKBOOK QNET HVAC Trainer for NI ELVIS Developed by Quanser Curriculum designed by Karl Johan str m Ph D Lund University Emeritus Jacob Apkarian Ph D Quanser Paul Karam B A SC Quanser Michel L vis M A Sc Quanser Jeannie Falcon Ph D National Instruments Curriculum complies with ABET Inc is the recognized accreditor for college and university programs in applied science computing engineering and technology Among the most respected accreditation organizations in the U S ABET has provided leadership and quality assurance in higher education for over 75 years 2011 Quanser Inc All rights reserved Quanser Inc 119 Spy Court Markham Ontario L3R 5H6 Canada info quanser com Phone 1 905 940 3575 Fax 1 905 940 3576 Printed in Markham Ontario For more information on the solutions Quanser Inc offers please visit the web site at http www quanser com This document and the software described in it are provided subject to a license agreement Neither the software nor this document may be used or copied except as specified under the terms of that license agreement All rights are reserved and no part may be reproduced stored in a retrieval system or transmitted in any form or by any means electronic mechanical photocopying recording or otherwise without the prior written permission of Quanser Inc Acknowledgements Quanser Inc
11. Scope with applied heater voltage in red 5 Device Selects the NI DAQ device 16 Sampling Rate Sets the sampling rate ofthe V Pz a7 Stp Stops the LabVIEW VI from running 18 HeateroFF Enables heater when pressedin Table 3 QNET HVACT PI Control VI Components 5 LAB REPORT This laboratory contains three groups of experiments namely 1 On off control and 2 Pl control For each experiment follow the outline corresponding to that experiment to build the content of your report Also in Section 5 3 you can find some basic tips for the format of your report 5 1 Template for Content On Off Control I PROCEDURE 1 Relay Control e Briefly describe the main goal of the experiment e Briefly describe the experiment procedure in Step 4 in Section 2 4 e Effect of varying relay amplitude on response in Step 5 in Section 2 4 e Effect of varying relay offset on response in Step 6 in Section 2 4 e Effect of changing hysteresis width on response in Step 7 in Section 2 4 2 Modeling e Briefly describe the main goal of the experiment e Briefly describe the modeling procedure in Step 6 in Section 2 5 ll RESULTS Do not interpret or analyze the data in this section Just provide the results 1 Temperature response from Step 4 in Section 2 4 2 Temperature response when varying relay amplitude in Step 5 in Section 2 4 3 Temperature response when varying relay offset in Step 6 in Sec
12. Signal Type Type of signal generated for the input Be votagesignat Amplitude Generated temperature reference signal C BN aituceinputbon 7 Frequency Generated temperature reference signal Hz ESS boxe Offset Generated temperature reference signal ar e Ear Heater voltage relay amplitude input box Heater vollage relay offset input box V Ti Ath Heater relay hysteresis width C A ao eO Tel Scope with reference temperature L blue and measured chamber RRNA ture in red Scope with applied heater voltage in red 4 Device Selects the NI DAQ device 15 Sampling Rate __ Sets the sampling rate ofthe V Pz 6 Stp Stops the LabVIEW VI from running A7 HeateroFF Enables heater when pressedin Table 2 QNET HVACT On Off Control VI Components Important The reference temperature is relative to the latched ambient temperature ID 3 in Table 2 The refer ence temperature is equal to the sum of the signal generated from the Signal Generator and the latched ambient temperature 4 3 PI Control VI In the QNET HVACT PI Control VI a proportional integral compensator is used to control the temperature of the chamber The PI control includes anti windup and set point weight strategies Table 3 lists and describes the main elements of the QNET HVACT PI Control virtual instrument user interface Every element is uniquely identified through an ID number and located in Figure 4 2 QNET HVACT PI
13. b 2 Modeling 30 min 1 Make sure the QNET HVACT On Off Control vi is running and has been calibrated as instructed in Section 2 3 When running the VI should look similar to Figure 2 3 2 Inthe Signal Generator section set e Amplitude 0 C e Frequency 0 008 Hz e Offset 0 C 3 In the Control Parameters section set e Vh amp 4V e Vh off 4V e DTh 0 50 C 4 Adjust the Temperature C scope scales to see both the reference and actual temperatures see the QNET HVACT User Manual 1 for help 5 Adjust the Offset in the Signal Generator to obtain a relatively symmetrical oscillation i e the rate of increase and decrease should be similar 6 Observe the heater voltage and the chamber temperature As discussed in Section 2 1 this can be modeled by the simple transfer function P s K s Find parameter K that would describe the relation between the voltage and the temperature signals Attach both the temperature and voltage responses used to find K and show your calculations 7 Click on the Stop button to stop running the VI 3 PI CONTROL 3 1 Background The oscillations that occur with on off control can be avoided by using a linear proportional and integrating controller To design such a controller analytically a simple model representing the actual plant is needed Since the conditions shown in Figure 3 2 are representative for what happens when the temperature is controlled transfer function 2 1 can be u
14. e voltage Under certain conditions the process can be modeled by the simple transfer function P s 2 1 where the parameter K is the slope of the ramp 2 2 On Off Control Virtual Instrument Tracking a reference temperature using a relay control is first examined in this laboratory Then when commanding a fixed refernce the system can be modeled The LabVIEW virtual instrument for on off temperature control is shown in Figure 2 3 amp QNET HVACT On Off Control File Edit View Project Operate Tools Window Help gt een QNET HVACT On Off Control E Q NATIONAL Device Sampling Rate Hz NA a UANSER Measured Temperature C fees Digital Scopes 21 8 Chamber Temp GTR C 21 6 Ambient Temp FEE BER c 21 47 21 2 Calibrate 21 20 8 Signal Generator 20 6 20 4 Signal Type m 20 27 peine 20 I I I I I I I I I I mplitude J 0 00 BOD 10 0 NGO NSD 1200 S o ss abo SED 100 Frequency J 0 0080 Hz Voltage V Heater Input Voltage 9 Offset J 1 00 10 9 Control Parameters 8 Yh amp y 3 00 Vh off J 3 00 70 25 1 0 I I I I i I I I I I 100 MoS Ho MST Too 1S0 seb TSA Asoc MSN Smi Figure 2 3 Virtual instrument for on off heater control See Wikipedia for more information on relay hysteresis mathematical model transfer function and LTI system theory 2 3 Startup 10 min After powering up the ELVIS and before running any of the labs follow t
15. ence To request a demonstration or quote please email info ni com ABET Inc is the recognized accreditor for college and university programs in applied science computing engineering and technology Among the most respected accreditation organizations in the U S ABET has provided leadership and quality assurance in higher education for over 75 years 2013 Quanser Inc All rights reserved LabVIEW is a trademark of National Instruments INFO NI COM INFO QUANSER COM Solutions for teaching and research Made in Canada
16. here Te meas IS the measured temperature from the thermistor and Ty is the transfer function time constant In creasing T decreases the cutoff frequency and minimizes noise in the signal at the expense of changing the shape of the signal Temperature control typically admits high controller gains A consequence of this is that the controller output may saturate and result in integrator windup The heater is therefore useful to illustrate the usefulness of integrator feedback 3 2 Speed Control Virtual Instrument The LabVIEW virtual instrument that implements the heater PI control is shown in Figure 3 2 The control parameters kp ki bsp the anti windup tracking time constant T and the filter time constant T can all be adjusted QNET HVACT PI Control QNET HVACT PI Control eero NATIONAL Device Sampling Rate Hz INSTRUMENTS rA Devi J 100 0 Setpoint 1 Temperature C Measured oS Digital Scopes Chamber Temp EZA E PERAS ane ee ee es ee Calibrate Signal Generator Signal Type ny y I I I I I I I I I Amplitude J 0 50 z i 90 0 95 0 100 0 Frequency J 0 0200 Hz Voltage Heater Input Voltage 4 Offset J 1 50 c 10 Control Parameters kp J 4 00 VIC ki J 0 500 Wi C s bsp J 1 00 Tr J 1 00 s mo N O SC Ov sso nD DESTES eE EEE Figure 3 2 Virtual instrument PI control for heater See Wikipedia for more information on process control control theory a
17. his procedure to calibrate the QNET HVACT system 1 Open the QNET HVACT On Off Control vi is open and configured as described in Section 4 2 2 Make sure the correct Device is chosen 3 Run the QNET HVACT On Off Control vi shown in Figure 2 4 4 The cooling fan is automatically activated when the Prototyping Board Power switch on the ELVIS unit is on Let the actual temperature Tc in the Temperature C scope settle until it stops decreasing 5 Adjust the Temperature C scope scales to see both the reference and actual temperatures see the QNET HVACT User Manual 1 for help 6 As illustrated in Figure 2 4 calibrate the temperature sensors by clicking on the Calibrate button This will align the chamber temperature Tc to the measured ambient temperature Ta 7 Activate the control by clicking on the Heater OFF button in the top right corner of Figure 2 4 amp QNET HVACT On Off Control File Edit Yiew Project Operate Tools Window Help gt S QNET HVACT On Off Control a Jeo Q NATIONAL Device Sampling Rate Hz INSTRUMENTS I Devi l J 100 0 Setpoint 9 PSZ WUA NS ER Temperature C Measured Zo Digital Scopes Chamber Temp 199 G Ambient Temp FEE JER c 7 4 Calibrate B 5j Signal Generator Signal Type A Amplitude 2 P 3 0 00 0 0 5 0 10 0 15 0 20 0 25 0 30 0 35 0 40 0 45 0 50 0 Frequency 3 0 0080 Voltage Heater Input Voltage Offset J 0 50 10
18. hown in Figure 2 1 V j y AT f EH s 2 Relay Heater Chamber Figure 2 1 Block diagram of the heater system with relay feedback The error variable e in Figure 2 1 is the difference between the reference temperature T and the actual chamber temperature T The on off controller is implemented using a relay switch with hysteresis as shown in Figure 2 2 The heater actuator is represented by a saturation block and the chamber plant is represented by the transfer function P s V V of y h amp hoff Vi off a ae gt gt Al Af Z 2 Figure 2 2 Input and output relation for an on off controller with hysteresis The hysteresis width A7 in Figure 2 2 has to be chosen such that a large measurement noise does not generate GUA NS ER any unintentional switches As depicted in Figure 2 2 the output control signal voltage of the on off controller can be adjusted using a mean or offset Vi o and an amplitude Vi amp In the experiment the behavior of the heater system will be investigated for different values of controller parameters More specifically the control signal and the measured temperature will be observed 2 1 2 Modeling The on off control input and the measured temperature output from the experiment have an interesting property that makes it possible to find a simple model for the process The temperature response is a ramp due a voltage step therefore the temperature is the integral of th
19. nd PID 3 3 Startup 10 min After powering up the ELVIS and before running any of the labs follow this procedure to calibrate the QNET HVACT system 1 Make sure the correct Device is chosen 2 Run the QNET HVACT PI Control vi shown in Figure 3 2 3 The cooling fan is automatically activated when the Prototyping Board Power switch on the ELVIS unit is on Let the actual temperature Tc in the Temperature C scope settle until it stops decreasing 4 Adjust the Temperature C scope scales to see both the reference and actual temperatures see the QNET HVACT User Manual 1 for help 5 As illustrated in Figure 3 2 calibrate the temperature sensors by clicking on the Calibrate button This will align the chamber temperature Tc to the measured ambient temperature Ta 6 Activate the control by clicking on the Heater OFF button in the top right corner of Figure 2 4 7 Adjust the Temperature C scope scales to see both the reference and actual temperatures see the HVACT User Manual 1 for help 3 4 Lab 1 Qualitative PI Control 30 min 1 Ensure the QNET_ HVACT PI Control vi is running and has been configured as described in Section 3 3 2 Inthe Signal Generator section set e Amplitude 0 5 C e Frequency 0 02 Hz e Offset 1 5 C 3 In the Control Parameters section set e kp 4 V C e ki 0 5 V C s e bsp 1 e Tr 1s 4 Examine the temperature response to the square wave input 5 Se
20. sed for the model based approach to find the controller The block diagram of the closed loop system is shown in Figure 3 1 r Al Figure 3 1 Block diagram of heater PI closed loop system m The process transfer function is the transfer function in Equation 2 1 and the input output relation for a PI controller with set point weighting is ki R s Y s S U s kp bsp R s Y s 3 1 The closed loop transfer function from the relative temperature reference AT T Ta to the output temperature measured relative to the ambient temperature AT T T is kp bsp 8 ki kK a RR 2 Gart AT s s2 Ky kps Koki we The closed loop system has the characteristic polynomial K kp s Kyk 3 3 and the desired closed loop characteristic polynomial is 8 Iwo ws 3 4 where wo is the undamped closed loop frequency and is the damping ratio The characteristic equation in 3 3 matches equation 3 4 with the proportional control parameter _ 2C Wo ky K 3 5 and the integral control gain 2 k ra 3 6 Large values of wo give large values of controller gain This implies noise will create large variations in the control signal The set point weight parameter bsp can be used to adjust the overshoot of the response The sensor signal is noisy and it is therefore necessary to filter the measured signal A simple first order filter has the transfer function En Tc meas Test GUA NS ER w
21. t ki to 0 V C s and change the proportional gain kp between 2 V C and 10 V C Explain the effect proportional gain has on the temperature control performance Attach a temperature response when using a low and high proportional gain 6 Set kp to 0 5 V C s and change the integral gain ki between 0 25 V C s and 2 0 V C s and observe its effect on the temperature control performance Show the temperature response with a low and high integral gain 7 Click on the Stop button to stop running the VI 3 5 Lab 2 Saturation and Windup 30 minil 1 Ensure the QNET_ HVACT PI Control vi is running and has been configured as described in Section 3 3 2 Inthe Signal Generator section set e Amplitude 0 75 C e Frequency 0 02 Hz e Offset 1 5 C 3 In the Control Parameters section set kp 8V C e ki 4 V C s e bsp 1 e Tr 100s 4 What effect does increasing the anti windup reset parameter have on the control signal and on the temperature response Attach a response of the temperature and heater voltage See the QNET Control Guide 2 for more information on anti windup Q GUA NS ER 5 In the Control Parameters section set Tr 1 0 s 6 What effect does decreasing 7r have on the control signal and on the temperature response Capture the temperature response as well as the heater voltage 7 Click on the Stop button to stop running the VI 3 6 Lab 3 Set Point Weight 20 minil 1 Ensure the
22. tion 2 4 4 Temperature response when varying hysteresis width in Step 7 in Section 2 4 5 Response used for modeling system in Step 6 in Section 2 5 lll ANALYSIS Provide details of your calculations methods used for analysis for each of the following 1 Effect of changing signal generator offset in Step 4 in Section 2 4 IV CONCLUSIONS Interpret your results to arrive at logical conclusions for the following 1 Finding the model gain parameter in Step 6 in Section 2 5 GUA NS ER 5 2 Template for Content PI Control I PROCEDURE 1 Qualitative PI Control e Briefly describe the main goal of the experiment e Briefly describe the experimental procedure in Step 5 in Section 3 4 e Effect of changing proportional gain in Step 5 in Section 3 4 e Effect of changing integral gain in Step 6 in Section 3 4 2 Set Point Weight e Briefly describe the main goal of this experiment e Briefly describe the experimental procedure in Step 4 in Section 3 5 e Effect of changing set point weight in Step 6 in Section 3 6 3 Saturation and Windup e Briefly describe the main goal of this experiment e Briefly describe the experimental procedure in Step 4 in Section 3 6 4 PI Control According to Specifications e Briefly describe the main goal of the experiment e Briefly describe the experimental procedure in Step 4 in Section 3 7 ll RESULTS Do not interpret or analyze the data in this section Just provide the results
Download Pdf Manuals
Related Search