Temperature control using pid controller

sir i ve a doubt that how should i control temperature at a particular value using this PID controller here i attach screen shot of my block diagram.please show me the path how should i controll
Attachments:
Capture.PNG ‏20 KB

Hi,
I am also looking for some what same situation. Did you get any answer?

Similar Messages

Thruster control using PID controller

Dear All,
Actually my project is related to heading control of an underwater system using PID controller - A Labview Application.
Till now, As per this forum discussion, I have completed the rotation count measurement of a compass C-100 device using Event structure and cFP controller.
Now I need to integrate the PID controller for thruster control according to the count value measured.
Could you please anyone guide me to start implementing the same. Please do the needful.
Thanks and Regards,
Dinsulpri.

Dear nathand,
Actually I need do a heading control application of a underwater system by using PID controller by the help of thrusters.
According to this,Firstly,I have completed the rotation count measurement of the system by interfacing the compass C-100 (for checking) with the cFP controller.It is working fine.
Now I need to do the PID controller part based on this count value measures, that is , I need to give the control signal to the thruster in order to release the twist of the system.
I just gone through the PID part in the labview and understood the concept and simulated the basic examples given in that.
My Understand as follows, Please validate the same and give me your suggesion on this,
1) Need to give Setpoint should be a thruster voltage .
2) I dontknow what to give in the process variable field.
3)Apart from this, how can I show this concept schematically with out connecting the thruster manually? Is it possible to show the demo in chart analysis format?
Please validate the above points and guide me to start working on this task.
The rotation count measurement application, Till now I did was attached with this. Please go through the same.
Thanks and Regards,
Dinsulpri.
Attachments:
Compass_Event Structure.vi ‏18 KB

Laser frequency stabilization using pid controller

Does anyone know of an example where the PID controller in LabVIEW has been used to stabilize the output frequency (wavelength) of a diode laser? A PID module for our laser can be purchased, but I'm hoping to try a LabVIEW-based system. Ideally, we'd like the long-term (minutes) variation of frequency to be a few MHz.

The input to the PID is the process variable which is the output of the lock-in. The lock-in is processing a signal which is related to the frequency of the laser. Is the set point in frequency units or something else?
The output of the PID goes to the current input of the laser controller. The only scaling in the PID is based on the values for Kp, Kd, and Ki.
So it seems likely that some conversion will be appropriate. Do you know enough about your optical process to have a value for the frequency change per volt of output of the lock-in? Do you know the frequency change per amp of laser controller input? You should be able to combine those values to determine an appropriate scaling factor.
You used "accuracy" and "precision" in successive sentences and I wonder if you have them confused. Accuracy refers to how close to the actual value a measured or commanded value is. Precision essentially refers to the number of significant digits in a value.
You have set the precision of the value written to the laser controller to 2 digits after the decimal point. If you want more precision (an if the instrument supports it), you need to change the format string.
Increasing the sensitivity of the lock-in is the same as increasing Kp in the PID. At high enough values most systems oscillate.
My first concern with oscillation would be the time delay. What are the time constant settings on the lock-in? How long does the laser controller take to respond to a command over the GPIB? Time delays in a feedback system make the system very difficult to stabilize.
The system I worked on never worked completely to my satisfaction. It always required a significant amount of manual tuning.
Lynn

Mult-channel PID control using PID Toolkit

I am controlling the light level in six locations (zones) using light sensors, dimmable ballasts (which respond to a 2 to 10 VDC signal) and the PID toolkit. In my VI, I loop through 6 times (once for each zone) to control the light levels. I use the simple PID.vi to determine the next setpoint for the dimmable ballast on the lights. My problem is as follows, I think:
The PID algorithm uses past response and the current difference between the measured variable and the setpoint to calculate the next setpoint. If my understanding is correct, then I am confusing the PID algorithm by calling it with 6 different data sets. It is almost as if I need 6 separate PID functions, one for each zone.
Perhaps I am wrong about the operation of the PID algorithm. Can someone straighten me out?
Attached is a snapshot of the VI. The FOR loop goes from 1 to 6, that is, once for each sensor zone.
Message Edited by rgentry on 04-29-2007 09:11 PM
Attachments:
temp.jpg ‏92 KB

rgentry,
The PID has two modes of operation: Single Channel and Muti-channel. The way you developed your algorithm, you are using single channel algorithm with multiple setpoint and variables. This will not work properly since LV will not keep the internal states correct for each channel.
To fix this, it is pretty simple. Remove the For Loop and provide the whole 1D array to the PID.vi. This will enable the "multi-channel" mode and every time you call your VI, it will keep the internal states for each channel, as if you had 6 different PIDs in parallel. Notice that the interpolation also will work the same way, you just need to remove the build array primitive.
Hope this helps!
Barp - Control and Simulation Group - LabVIEW R&D - National Instruments

DC motor speed control using LQR controller

can i control the speed of a DC motor using Linear Quadratic Regulator (LQR) controller in LAb view

In short, yes. The best experience is when you actually have the LabVIEW Control Design and Simulation Module. Here are some examples related to this topic:
C:\Program Files (x86)\National Instruments\LabVIEW 2013\examples\Control and Simulation\Case Studies\Mechatronics\DC Motor\CDEx DC Motor with State-Space.vi
C:\Program Files (x86)\National Instruments\LabVIEW 2013\examples\Control and Simulation\Case Studies\Mechatronics\DC Motor\CDEx Robust DC Motor.vi
C:\Program Files (x86)\National Instruments\LabVIEW 2013\examples\Control and Simulation\Control Design\State-Space Synthesis\CDEx LQR.vi
Notice that you have much more examples of LQR and Motors under:
C:\Program Files (x86)\National Instruments\LabVIEW 2013\examples\Control and Simulation\Control Design\State-Space Synthesis
C:\Program Files (x86)\National Instruments\LabVIEW 2013\examples\Control and Simulation\Case Studies\Mechatronics
C:\Program Files (x86)\National Instruments\LabVIEW 2013\examples\Control and Simulation\Case Studies\Electrical Machines
Barp - Control and Simulation Group - LabVIEW R&D - National Instruments

Help me in my mini project about dc motor control using labview

hi,
actually the idea is that using pid controller in labview.. controlling motor.i.e giving a setpoint to pid... n checking whether motor is running accordinly using a sensor.. i.e feedback n/w... i dnt knw hw to proceed.. can u help me with the circuit diagram

Hi swats,
"i dnt knw hw to proceed.."
I suppose you mean "I don't know how to proceed..", something is wrong with your "o" key
I would suggest going to the library of your school or university and get a book on basics of electric devices. There you will find a lot of hints on how to measure speed of motors and how they work. In fact your question covers several seminar hours in "Electrical Measurements" course at university...
Best regards,
GerdW
CLAD, using 2009SP1 + LV2011SP1 + LV2014SP1 on WinXP+Win7+cRIO
Kudos are welcome

Usage of PID controller instead of ON OFF controller

respected sir,
I pursuing btech final year in the stream of instrumentation.sir i have a doubt while go through my project,can i use PID controller instead of using ON OFF CONTROLLER. would you please suggest me the possible ways which are going to implement in my final project intelligent wheel chair.i am eagerly waiting for your valuable acknowledgement.
thank you,
with warm regards,
BOMMAREDDY

Hi!
I am not sure if I completely understand the question but if you are wanting to do autotuning for PID there is actually a VI that will do it for you. It is called PID Autotuning.vi and can be found under the PID Control pallete in LabVIEW. The LabVIEW Help file also contains more detailed information on the inputs and outputs to the VI.
Carlton
CLD

I need to maintain a temperature profile for my process.Can i use PID control for this application?

Hi all,
I need to maintain a temperature for my process.Can i use PID control vi's for this application?
I have NI-PCI 6023E DAQ board.Should I need any other hardware components???
Any help in this regard is highly appreciated.
Thanks,
radhika

Hi,
Thanks for your reply.
I do have a temperature sensor and it is read by the DAQ (NI 6023E) .
Also i have a voltage input to the program which has to be controlled in order to control the temperature.
So , I am using a PID , the output of the PID should control the Voltage input so that the temperature is controlled.
Can I give the voltage input and the temperature to the PID through the DAQ and just use one more channel in the DAQ to get the output from the PID.Will that work???
I am not sure why you have mentioned SC2345,SCB68.
Thanks,
radhika

Temperature control system using thermocouples and cooling fans

Greetings labview community,
I'm fairly new to the labview program and though I have watched the tutorial videos and tried to search these forums I couldn't find a solution to my problem.
I need to write a program in labview that controls the temperature via use of fans inside a case with heatsinks and various electronic parts.
In particular I want to use two thermocouples, in order to measure the temperature of two transistors (one in each side of the case), where heatsinks are placed on top of them.
When the temperature is above 25 degrees, a fan should activate. The fans speed should be faster, the longer the temperature stays above 25 degrees, until it drops down to 25 degrees.
How can this be done? I thought of using a "mask and limit testing" for activating it, but I can't figure out how to control the speed of the fan in a loop automatically based on the temperature.
Here are some of my specifications:
USB-6009 (this was provided to me and is therefore my only option)
Labview 2011
NIDAQmx 9.5 driver
2 thermocouples (one for measuring the temperature for each transistor and activating one fan)
2 fans 0-5V
Below you'll see an attachment of the program I've wrote so far (just for one set of thermocouple-fan) and I'm using a slider to simulate the input from the thermocouple. If there is anymore information needed, tell me.
Thank you very much.
Attachments:
Temperature sensors and fan activation.vi ‏130 KB

Hi Lomedil
What you have is a general control problem. This statement:
"The fans speed should be faster, the longer the temperature stays above 25 degrees, until it drops down to 25 degrees. "
Is an indication that you at least need a PI-controller, or you could use a PID-controller. The I in PID stands for integral and that means that the longer you have the same value different from your reference the larger the control signal will be and thereby the faster the fan will spin.
I would recommend you to have a look at the following article to learn the basic principles of control theory:
PID Control
http://zone.ni.com/devzone/cda/tut/p/id/6440
To find the coefficients in your design you can either choose to make a mathematical approximation of your test setup and then calculate the three constants Kd, Ki, Kp using this model, or you can choose to estimate the parameters on a "trial-and-error" basis until you have the desired response time / overshoot i.e.
In general you should note that designing a control application on a General Purpose O/S as Windows will not give you deterministic timing, thus your control loop can be more unstable than expected, design your controller with this in mind! For the fan operation it should not be a problem but for more advanced control purposes your would always use a Real-Time system like the singleboardRIO, compactRIO or setting up a standard PC as a LabVIEW Real-Time Target (Converting a Desktop PC to a LabVIEW Real-Time Target - http://zone.ni.com/devzone/cda/tut/p/id/2733)
Best Regards
Anders Rohde
Applications Engineer
National Instruments Denmark

Throttle body PID control using pulse width modulation

Hello all,
I am trying to do a PID control for a throttle body (using pulse width modulation) for a set value of feedback voltage. The process variable is the pulse width duty cycle. The throttle body is expected to be fully open at a feedback voltage of 5V and pulse width duty cycle of 42.5%. When I use the highlight execution using the attached file, I can see the throttle body fully open (the values observed are: PID output 42.5 %, feedback voltage approximately 4.7V). However, when the highlight execution is unclicked, the throttle body flutters in the closed condition (still PID output 42.5%, feedback voltage approximately 0.9 V). Can any one please help by suggesting any modification to this attached file to make this throttle body respond to the set value of feedback voltage.
Many thanks
Ajith
Attachments:
Throttle body control using PWM technique - PID.vi ‏525 KB

How did you determine your P, I, and D gains? If you have not tuned your controller, you'll get poor performance. Running with execution highlighting will slow down the execution, which will change the effect of the gains. I would start with pure proportional control (I and D = 0) with a small proportional gain, and see if it responds in approximately the way you want. If so, then your code is probably correct, and you just need to do a full tuning to get good performance. There are many resources available on the web, on this forum and elsewhere, for PID tuning. Note that since your code uses a simple PID example, and not the one from the PID toolkit, the gains do not have the units that are used in many tutorials so you'll have to correct the calculations to compensate.

PID control using LabView 6i

Hallo,
We use NI PCI 6024E Card in PC with Celeron 1,1 GHz, 256 MB SDRAM,
The Card has 16 Analog input and 2 analog output. I plan to use this card as
a PID controller.
Our LabView contains the modules for motions and all the add ons to.
The question is, whether the PCI 6024E is capable to do controling, since we
have to
control the velocity of 2 mm/s with scan rate 50 S/s.
thanks

I can tell you that using a PC of similar horsepower under XP Pro and a PCI-6071E I've successfully run PID loops with sample rates of 10KS/s in 100msec bursts. At first I was seeing a fairly high rate of input buffer overflows. But when I set LabVIEW's execution priority to "High" this problem all but disappeared. (At some time in the future we plan to migrate to LabVIEW RT, which I hope will cure this problem completely.) 50S/s should be a breeze. You might want to add memory. I've got 512Meg in my machine.

How to use PID function to control a DC motor? ?

Hi everyone,
I wanna control a 6v DC motor using PID control toolkit 8.2.
- a close loop control system with an encoder sensor
- using a DAQ card model: NI USB-6008
- the DAQ card will be able to output pwm signal to the transistor then to my motor
Im stuck at getting pwm signal from the pid.vi and i wanted to know what is the process variable (PV)
pls help me on my problem, if can pls make an example VI for me
Thanks !

Duplicate Post

Problem using PID toolkit and control design toolkit to design the closed loop system. (for DC motor closed loop)

Hi, i have facing some problem during i upgrade a project. This project is an opened loop system, it only achieved up to controlling the speed of motor, detecting the speed of motor, and switching the direction of motor while controlling the motor (This motor is a 12 VDC motor).
In order to improve the project, closed-loop dc motor control system will be implemented to correct the error of the motor's speed and maintaining the speed for the initial setting. I would like to use PID control method to do the closed loop system.
I already installed the PID toolkit V8.2 and control design toolkit V2.1.2, and i'm using DAQ usb 6221, LabVIEW 8.5
Below is my problem.
http://img177.imageshack.us/my.php?image=howtocreatethesetpointnx2.jpg
question: 1. How to generate a icon for set point? my setpoint is duty cycle...
2. How to feedback the output duty cycle to summing junction?
below this is my basic concept
http://img237.imageshack.us/my.php?image=closedloopbz5.jpg
Problem 2:
http://img357.imageshack.us/my.php?image=problem1yk2.jpg
question: Why PID toolkit icon cannot wire to cd series.vi?
Below is my original program...
http://rapidshare.com/files/140538836/pwm_generate-final_PSMII.vi.html

Hi Cyrus
Have you had the opportunity to see our
developer zone site on the PID toolkit? This article also has sample
code at the bottom that may help you in developing your application. I
have also linked below knowledge bases regarding setting a point
profile and generating a PWM from a digital output line.
PID toolkit
http://zone.ni.com/devzone/cda/tut/p/id/6440
How to generate a set point profile:
http://digital.ni.com/public.nsf/allkb/125F27AC143B6AFD86256C2B0004A4DC?OpenDocument
How to generate a PWM on a digital output line:
http://digital.ni.com/public.nsf/allkb/1561D31534F07D608625727900391114?OpenDocument
Thank You
Eric Reid
Thank You
Eric Reid
National Instruments
Motion R&D

Factors to be considered while designing a PID controller

Hi ,
I am designing a PID controller for a temperature control system.
What are the factors should i consider to decide the PID controller range?
I have to adjust the heater voltage to keep the process temperature under control.
How to simulate the program without actually getting the process temperature??
Will the PID Controller work with any relation (for simulation purposes)between heater voltage and process temperature??
Am not an expert in PID controller.............
could someone guide me ...........
Thanks,
radhika

Hi Radhika,
For guidelines on setting parameters of your PID controller, you can search and find good information in books and all over the web (e.g. root locus and Bode plots).
As far as LabVIEW is concerned, you might want to take a look at the Control Design Toolkit, and its manual, available here.:
http://sine.ni.com/nips/cds/view/p/lang/en/nid/13854
And you could use something like a simulate signal express VI to simulate an input to your system.
Hope that helps! Take care,
-Sam F, DAQ Marketing Manager
Learn about measuring temperature
Learn how to take voltage measurements
Learn how to measure current

Circuit for auto tuning of pid controller in lab view

Hi sir
for my project in auto tuning of pid controller using labview,for that
i require a simple circuit diagram(lab view figure) and have no problem in running for that
i will be very thankful to you

Hi!
I am not sure if I completely understand the question but if you are wanting to do autotuning for PID there is actually a VI that will do it for you. It is called PID Autotuning.vi and can be found under the PID Control pallete in LabVIEW. The LabVIEW Help file also contains more detailed information on the inputs and outputs to the VI.
Carlton
CLD

Temperatur​e control using pid controller

Similar Messages

Maybe you are looking for

Temperature control using pid controller