Ziegler-Nichols Tune (Closed Loop) - Fisher Wizard

[@lucianoferrari5066]

Excellent video. This is just a simple and great way to see what in essence automatic control actually is. Thank you so much.

[@AutomationCliff]

No problem! I’m glad you found it useful. I had fun making it!

[@KumarSunil060]

Hi, your video is quite helpful. Can you put any video on how to perform calibration and preventive maintenance of this controller.

[@AutomationCliff]

Thanks for the feedback! I will consider making a second video if I have access to the equipment in the future.

[@NoPlan.Goworld]

Wow your explaination is so amazing. It is exactly what i was looking forward.

[@AutomationCliff]

준의롱보드 I’m glad I was able to help!

[@hrcsanchez271]

thank you so much

[@AutomationCliff]

You’re welcome!

[@darinluciow]

What a fantastic video and explanation. This deserves more views and likes. Thank you for this. My process control class makes a lot more sense to me now.

[@wojciechmikoajczyk789]

Mr Long, it would be useful to add some explanations for beginners concerning difference between K and 1/K=% : additionally to show how this regulator would operate in P and PID modes

[@AutomationCliff]

Yes, I agree. If I have access to this equipment again in the future, I will definitely consider making a second video. Thanks for the feedback!

[@Amineben89]

I have the same controller but with a dial 3 to 15 psi

[@AutomationCliff]

Cool! What is it controlling pressure on?

[@fawazalhamdan5469]

I have a model 4195KAME remote setpoint adjustment my question is can I move the setpoint by hand like what you did in this video??

[@AutomationCliff]

I haven’t used a 4195 with a remote setpoint adjustment before. The manual it says the ‘M’ designates the remote set point option. It says it has a capsular element with a linkage to the set point indicator. You need to apply pressure to the capsular element to adjust the setpoint. Increasing pressure to the element increases the setpoint and decreasing pressure decreases the setpoint. Based on this information I would assume you would not be able to adjust the setpoint indicator like I did in this video unless you were able to disconnect the linkage between the setpoint indicator and the capsular element. If you cannot disconnect the linkage, you would have to move the indicator by applying pressure to the capsular element.

[@MaxKharevsky]

Hi, Man) Thanks for video, very informative and understandable ❤❤❤ Just one question, Dude: we have supply air pressure for Controller, our Controller gives output signal from 3 to 15 Psi usually, but I guess this pressure not enough for valve actuator, I mean same air pressure 3-15 psi going to our valve actuator 😮?

[@AutomationCliff]

Sorry, I don’t follow your question. Are you saying you have a problem with the controller working with your valve actuator?

[@MaxKharevsky]

@AutomationCliff Nope, I don't have any problem, but I'm just curious about this topic. And if, for example our valve operated by controller, which pressure going to actuator, same 3-15 psi, or this is only control air and for actuator actuation going another air?

[@kingmode4]

Where is the Zero and span adjustment? Can you do a video on calibration input vs output?

[@oliversalvador8694]

Sir if I may where 0.45 came from?

[@AutomationCliff]

It is the value from the Ziegler-Nichols tuning method for use when tuning and proportional plus integral controller. If you look up the Ziegler-Nichols tuning method, you will find it in a table.

[@oliversalvador8694]

@@AutomationCliff thank you sir

[@tiennghiabui2532]

hi Sir, this is good video for me. The controller used for diaphragm actuator with single acting. how about for piston actuator? is it working normally with?

[@AutomationCliff]

Tiennghia Bui the controller can be configured to output either a 3-15 or 6-30 psi pneumatic signal, so the actuator would need to be compatible with that type of signal.

[@SonNguyen-mb5be]

Dear sir, thanks so much for your video. Would you please explain me about these concepts in DVC6200 Fisher Positioner are proportional gain, velocity gain and minor loop feedback gain. the 1st gain is Kp but what are the other

[@AutomationCliff]

Son Nguyen That’s a good question. Making an educated guess I would say the velocity gain is derivative gain and minor loop feedback gain is an integral gain. It almost appears they changed the names to be more specific to a positioner. Knowing that position is a fast process to control and looking in the DVC6200 manual at these gain values used for different configurations, the higher suggested minor loop feedback gain and the lower suggested velocity gain match gain values that would be used for integral and derivate gain values on faster processes. This would have to be confirmed with Fisher to be 100 % certain though.

[@alkiviadiszournatzis4161]

This method can be used also for pi controllers??

[@AutomationCliff]

Alkiviadis Zournatzis, yes, the Ziegler-Nichols method can be used for proportional, proportional-plus-integral (PI) and proportional-integral-derivative (PID) controllers.

[@jorch778]

sir i really like your video, i have a question, from where this relation come from Kp=100%/P.B and how we choose P.B value for a system

[@AutomationCliff]

jorch778 thanks for asking this. Proportional band (PB) is a way to express the sensitivity of the proportional setting on a controller. It will be available as an adjustment on any controller using PB. The other way of expressing this sensitivity on a controller is proportional gain. Proportional band represents the amount of controller error that will cause the controller’s output to change by 100%. As noted in the video, proportional band is directly related to the proportional gain. Some controllers will use a PB adjustment and others will use gain adjustment. It’s really whatever the manufacturer decides when they design the controller. This particular controller in the video has the PB adjustment, so we had to convert our proportional-gain value calculated from the Ziegler-Nichols tune to a PB value.

[@faisalawan6287]

Sir nice video. My question is that in an equation Kp=0.45 (ku) , where you get 0.45 ? and similar in an equation TI=Tu/1.2, wher you get 1.2?

[@AutomationCliff]

faisal awan these were values determined by Ziegler and Nichols when they came up with the tuning method. These values can be found online by doing a quick google search. I use the traditional values for producing quarter-amplitude decay in this video, but there are also some modified values floating around out there for producing a response without overshoot as well.