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Found 19 results

  1. Hello Everybody, has anybody created classical heating circuit in HVAC (control block)? Idea is to control mixing valve (0-10V or 2digital outputs) based on flow temperature and outside temperature. Please share it if anyone created block already. For any adittional help, I am here. Best regards,
  2. Hi, First time I am using PID on a Jazz. I want to keep the pressure within a system steady, regulated by a solenoid valve that has a constant pressure supply on it; and in turn feeds the closed system. Attached are my setup and I have a few questions: 1. My CV is the controlled digital output on the solenoid valve that opens when the pressure drops; reads of a 0-10V pressure sensor; and closes when that pressure reaches my setpoint. How can I setup the CV to a digital output? 2. My Process Value and Setpoint I have them linked to the same MI because I want to keep t
  3. We have about 50 Vison PLCs currently in operation in many projects. A few weeks ago we started to switch from Visilogic 9.8.64 to 9.8.90. We noticed that the PID functions were not working anymore. After a long time of troubleshooting we realized that we had to delete all "PID A.TUNE Config" blocks and rebuild them again. Is this a known problem? Is there another possibility to fix this?
  4. Hi, In a control loop I am using a proportional valve with an input -10V to +10V. With that input the process can be move left and right. When it has to be go to the right the input has to be positive, depend on the distance between 0 and +10V. When it has to be go to the left, the input has to be negative between 0 and -10VDC. Therefor I am using a output -10VDC to +10VDC. Now I will use a PID loop for it. Only what I find is a positive or negative PID control, so it can just 1 side on. You can switch this between cool and heat. But I wil not use that switch
  5. I'm a student studying at De Montfort University and currently trying to design a PID autotune programme to heat an element. The programme is designed using Visilogic and is for a V350-J-TRA22 controller. I have managed to display the temperature detected by a thermocouple on the HMI and the programme is almost exactly the same as the one shown in the 'PID' tutorials video on the Unitronics main site but when the controller is wired to an oscilloscope there is no output of any kind. Various combinations and checks have been carried out but nothing so far has worked. Does the a
  6. Hey there folkz. I have a test station here that i prep for 2021. Im not to well used for plc progamming so i hope i can get my answers here. The task is to make A program to be created in sequence with a percentage increase in air pressure in the tank, with fixed consumption. The working area of the tank is 0-5bar The sequence is as follows: Tank pressure increases to 25% The pressure is kept stable for 1 min Tank increases to 50% held for 1 min Tank increases to 75% held for 1 min Tank drops to 25% and the sequence is reatarted. i understand that pid is involved i
  7. Dears, I am using PID functions...and I thik to have learned how this works but I don't found a way to "stop/reset" the autotune procedure when active!?...i try to explain what i need...I am talking about a management of heating element...if I start the autotune (PID config status = 2) and the real temperature is not increasing (heating element broken or not connected) what I have to do to stop the autotune to have back its status as "0"?...I tried to set "0" the BIT to enable the Autotune UDFB but the status stay at 2...I have wait many minutes with the BIT "1" without increasement of th
  8. Hello! I'd like to make a PI(D) without auto-tune, so that I can determine P and I myself (D is going to be zero). Which FB do I use? -Mia
  9. Dears, is possible, during the PID autotune procedure, change the set point value? I mean...if I select "Cycles.Three" the procedure will increase to reach, and go over, 4 times the set point and also decrease 4 time to be below of the set point....is possible set (pass) for each of these 4 steps a different set point?...for example 70, 90, 110, 130? in this way the autotune procedure will be "masked" in what could be a standard start up of the system. thanks
  10. I need know how can reset in PID block in state -13 fault. Don't possible set value and value is retentive , same with download this application. now I am with PID locked in state -13. Peale tell me how out this problem. regards.
  11. Hi, In my program PID auto tune is not functioning. Overshoot came across when I tried it. After that I entered values manually in the PID loop.In that also little bit of overshoot could observed. May I get some help from to solve the PID issue.
  12. Good morning guys, I implanted PID auto tune program, is to present fail. Status : (-11) My question, the is resolution ? I’m Sorry for English. Thanks
  13. Bonjour, Actuellement, je suis en BTS et j'ai un projet de régulation de pression qui doit être fonctionnelle en fin d'année. Au niveau du bloc PID. A l'entrée, j'utilise un capteur de pression 4-20mA et une sortie 0-10V qui va être envoyée au variateur. Le problème, quand le destinataire est supérieur à la valeur de l'entrée PID, l'erreur est à 12 mais la sortie de la réaction, le reste à 0.
  14. Hi everyone! I'm having some doubts. I configured the PID Config FB and after that I did an AutoTune. I tried to run the PID control loop energizing the "PID A.Tune RUN" FB and it worked very good, but I have some questions. Once I finish my PID Control loop, do I need to reset numeric MI associated to Control Output value? If I don't do that, it remains with the last value before de-energize the "PID A.Tune RUN" FB so the Duty Cycle of PWM associated to that Control Output does not go to zero. Another question: when I de-energize the "PID A.Tune RUN" FB, the PID Status m
  15. Hi , I have been working with the PID loop and it seems very complicated. I just want a simple PID loop (I'm anti auto tune) with manual mode (straight output) and automatic mode (with manual tuning) and I've seen posts that seem to imply that this can be done. Would I used the Run PID function? Or set the parameters in the config struct, Load PID AutoTune Data, then save it? and then Run PID? Would I use the PID AT Params or PID_Config struct or both? I only need a PI controller - so would I need to set SP, PV, P, I, Control Valve, Reverse Action (Does this account for a negati
  16. Hi@all, U90 Help file says about #of PID loops: "Jazz controller loop capacity varies according to model." Unitronics website says about Jazz PLCs: "Auto-tune PID, up to 4 loops" I thought about using a Jazz JZ20-R10 for my Project and need two PID loops. When I select "PID" in U90Ladder only one PID is configurable. My question: Which Jazz PLC does have 2 or more PID loops? - or - Where can I obtain informaition about # of PID loops in Jazz PLCs I searched the website, the forum, specsheets and have not found any information about it. Thanks forward! Sell
  17. Hello, Using UniLogic V 1.21.51, I was hoping to create a 'Template PID' struct containing 'PID AT Params' and 'PID Config types', but these do not appear as options when attempting to add new members. The idea was then to also add some other housekeeping fields to my 'Template PID' struct, and use it as a type to create 24 global tags to manage 24 independantly-controlled oven zones in parallel. Is this possible? I was hoping to avoid having to uniquely name 24 sets of three global struct tags (such as 'PID AT Oven1 Zone1', 'PID Config Oven1 Zone1', 'PID Housekeeping Oven1 Zone1', etc.
  18. I am trying to retain the values of a PID structure but I do not know how to do it. Any ideas? Thank you.
  19. edwi

    20160322 103121

    From the album: SOLARHARWEST

    heatexchanger using a Samba 4.3 for dual pid control of oil and water pump's,and run signal for gps sun tracker, fresnel lens is not attached yet
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