PID Heater Control

Started by rickman in sci.electronics.design2 years ago 47 replies
PID

If a heater is controlled by turning it on and off, does a PID algorithm help in more closely controlling the temperature? Will running the...

If a heater is controlled by turning it on and off, does a PID algorithm help in more closely controlling the temperature? Will running the PID loop faster than the temperature measurement improve anything? How would a PID control be an improvement over a simple temperature comparison with or without an anticipator? -- Rick


Looking for Ready made stand alone DIGITAL PID.

Started by Jamie in sci.electronics.design8 years ago 21 replies

As it said. We need to replace some analog PID boards due to supply and side effects the existing ones have. The PID code that comes in...

As it said. We need to replace some analog PID boards due to supply and side effects the existing ones have. The PID code that comes in digital drives and process controllers are pretty much what we're looking for how ever, we only need just a design that allows a input ref, reference feed back and a output to drive what ever device. This device should have it's own mini LCD inter...


Problems with Autotuning for a servo control

Started by Wolfgang in sci.electronics.design9 years ago 1 reply
PID

What I want: A Autotuning for a servo control The Process: The control signal is the current of the motor. The motor has an encoder which is...

What I want: A Autotuning for a servo control The Process: The control signal is the current of the motor. The motor has an encoder which is used for the field oriented control and additionaly for position control. The control loop: there is one PID controler for the position control. The Encoder delivers the real position and the error is calculated and input to the PID. The PID outputs...


Video on tuning PID controllers

Started by Tim Wescott in sci.electronics.design1 year ago 20 replies
PID

Yet another video on tuning PID controllers has been tossed into the YouTube pool. ? https://youtu.be/drYO60z6_h4 -- Tim...

Yet another video on tuning PID controllers has been tossed into the YouTube pool. ? https://youtu.be/drYO60z6_h4 -- Tim Wescott Wescott Design Services http://www.wescottdesign.com I'm looking for work -- see my website!


PID Control programming Questions

Started by RogerN in sci.electronics.design4 years ago 12 replies
PID

I have a program being ran every 20 milliseconds and I'm trying to implement PID control. So P = SetPoint - Actual, I = I + P ? , and D = P -...

I have a program being ran every 20 milliseconds and I'm trying to implement PID control. So P = SetPoint - Actual, I = I + P ? , and D = P - Old_P???? On D, should "Old_P" be from the previous round or should it be a value from a certain length of time ago? Also, is "I" just summed up or is it the sum of I over a certain length of time? I'm trying to find out if I need to set up a...


How about it? Experiments of the third kind , take 999999.

Started by Jan Panteltje in sci.electronics.design5 years ago

How about it? Experiments of the third kind , take 999999. Update Testing the temperature controller There has been some talk about PID...

How about it? Experiments of the third kind , take 999999. Update Testing the temperature controller There has been some talk about PID controllers to keep temperature constant. And I wanted to keep the 'D' out of the PID. After the melted box experiment (see early postings on this subject), I had some idea of the amount of power needed to keep the box with sensors at about 40C, and fr...


numerical methods for calculating PID equivalent functions

Started by Jamie M in sci.electronics.design3 years ago 27 replies
PID

Hi, Can a partial differential equation be numerically calculated to give a function that is equivalent to a PID loop for controlling a...

Hi, Can a partial differential equation be numerically calculated to give a function that is equivalent to a PID loop for controlling a multivariable system (ie a lunar lander with yaw/pitch/thrust to land on a given X/Y coordinate from a given altitude)? Do partial differential equation solvers ie for the heat equation, also work for large numbers of variables, ie 10? Is this method ...


how to used frequency in compensators.....................

Started by pavank ningala in sci.electronics.design10 years ago 4 replies
PID

hi, this is pavan,presently i am dealing online ups project.In that i am usin pid and pfc fuctions. in pid i get problem in using...

hi, this is pavan,presently i am dealing online ups project.In that i am usin pid and pfc fuctions. in pid i get problem in using of compensators,any one please send me voltage compensator transfer fuction equation and current compensator transfer fuction equation.please send me breifly.........! regards, pavan ningala.


PI/PID controllers and tuning

Started by George Herold in sci.electronics.design5 years ago 2 replies
PID

Hi guys/gals. A bit of a problem has caused me to revisit PID/ PI controll= ers and tuning. I have this nice paper on the Ziegler=96Nichols...

Hi guys/gals. A bit of a problem has caused me to revisit PID/ PI controll= ers and tuning. I have this nice paper on the Ziegler=96Nichols tuning me= thod that compares the closed loop period to the open loop step response of= the system. It then shows the closed loop step response for different tun= ing parameters. But I can=92t seem to lay my hands on it... grumble. I=92= ll keep se...


frequncy problem in voltage compensator transfer fuction ....................

Started by pavank ningala in sci.electronics.design10 years ago 1 reply
PID

hi, this is pavan,presently i am dealing online ups project.In that i am using pid and pfc fuctions. in pid i get problem in using...

hi, this is pavan,presently i am dealing online ups project.In that i am using pid and pfc fuctions. in pid i get problem in using of compensators,any one please send me voltage compensator transfer fuction equation and current compensator transfer fuction equation. I have one equation............ Gv(s)=Kpv((1+Tco.S)/Tco.S) here Kpv=(2K2K3/K1Km)*(Vacmax/Vacmin)*(Vac...


Any electronic use for magnetic paint?

Started by amdx in sci.electronics.design7 years ago 18 replies
PID

Ran across this Magnetic paint at Home Depot the other day, just thought I'd make others...

Ran across this Magnetic paint at Home Depot the other day, just thought I'd make others aware. http://www.rustoleum.com/cbgproduct.asp?pid=127 Mikek


New Video: Implementing the PID Controller in Software

Started by Tim Wescott in sci.electronics.design1 year ago

https://www.youtube.com/watch?v=JVqJ7uRGwoA -- Tim Wescott Control systems, embedded software and circuit design I'm looking for work! ...

https://www.youtube.com/watch?v=JVqJ7uRGwoA -- Tim Wescott Control systems, embedded software and circuit design I'm looking for work! See my website if you're interested http://www.wescottdesign.com


PID Without a PhD, Finally

Started by Tim Wescott in sci.electronics.design1 year ago 128 replies
PID

Embedded Systems Design (or whatever they call themselves) kept moving this around -- so I've revamped it, updated it, and posted it on the...

Embedded Systems Design (or whatever they call themselves) kept moving this around -- so I've revamped it, updated it, and posted it on the web. Take a gander. Please comment on anything you like/don't like. I'm not sure if the way that I'm setting off the math is a Really Good Idea or a Really Bad Idea -- I'm trying to make it easy for the math-averse to skip over it, without breakin...


A question for you LM324 experts on failure problems.

Started by Jamie in sci.electronics.design6 years ago 17 replies
PID

We have some devices that have been in use for many years (not made by us). These are analog PID boards that employ a 324N chip. The...

We have some devices that have been in use for many years (not made by us). These are analog PID boards that employ a 324N chip. The circuit works very well and is very flexible in what it can do. THis is the problem. Lately been getting a few random failures of the op-amp. Today, one failed simply by turning one of the pots on the board that is in the feed back loop as the GAIN con...


OT: Google is getting really smart

Started by Spehro Pefhany in sci.electronics.design10 years ago 8 replies
PID

type in this: 1 lakh indian rupees in USD (the price of Tata's new car) and it responds: 1 lakh Indian rupees = 2 547.2 U.S....

type in this: 1 lakh indian rupees in USD (the price of Tata's new car) and it responds: 1 lakh Indian rupees = 2 547.2 U.S. dollars http://www.bloomberg.com/apps/news?pid=20601091&sid=acHGVoFxur.Q&refer=india


new a better DSP soluition.

Started by Jamie in sci.electronics.design8 years ago 5 replies

We have a piece of equipment that has 2 optical potentiometers mounted on a process machine, which generates an oscillation effect up to 100...

We have a piece of equipment that has 2 optical potentiometers mounted on a process machine, which generates an oscillation effect up to 100 hz from the second pot. This causes the first Pot to also get effected by this movement. Thus, we needed to remove this oscillating component from the first pot so that the final PID loop wouldn't see this component, to regulate the position of th...


I don't understand thermostats

Started by John Larkin in sci.electronics.design2 years ago 51 replies
PID

Imagine a mass that we want to heat with some closed-loop controller. It's C2 below. Voltage represents temperature. Thermal systems...

Imagine a mass that we want to heat with some closed-loop controller. It's C2 below. Voltage represents temperature. Thermal systems are diffusive, which we represent as a bunch of RC lags. Assume the voltage at C4 is the temperature sensor. If I were to design a PID controller, I'd have to really think about it, or fiddle some, to keep it stable. But if I do a dumb on/off thermostat, ...


small (3A) AC current measurement

Started by Luis Perez in sci.electronics.design6 years ago 22 replies

Hi guys, I'm trying to measure resistance, current, and voltage of a resistor (heater) connected to a 0-24V @ 3A transformer. The heater's...

Hi guys, I'm trying to measure resistance, current, and voltage of a resistor (heater) connected to a 0-24V @ 3A transformer. The heater's consumption is actually 2A max., and I'd be controlling it with a triac driven with an 8-bit micro, which I'd also use to get the above readings and send them to the host. This is my initial layout: https://docs.google.com/viewer?a=v&pid=explorer...


Improved Diode Recovery Model

Started by Tim Williams in sci.electronics.design19 hours ago 7 replies

https://docs.google.com/viewer?a=v&pid=sites&srcid=ZGVmYXVsdGRvbWFpbnxyc3RldmVzY290dHxneDo1NjQ1Z TI1ZTY2MWFiM2Yz This had been discussed some...

https://docs.google.com/viewer?a=v&pid=sites&srcid=ZGVmYXVsdGRvbWFpbnxyc3RldmVzY290dHxneDo1NjQ1Z TI1ZTY2MWFiM2Yz This had been discussed some time ago. There was a lot of bragging about being able to create a model, but nothing came of it. Fortunately, this guy had beaten us to the punch, and released this paper publically. The design with multiple time constants makes me think of appro


State variable notch filter.

Started by George Herold in sci.electronics.design1 year ago 10 replies

I was trying to turn a previous SV filter into a notch, (Freq ~3.3 kHz, Q~10-20, see my mech. PID thread.) I was thinking of just subtracting...

I was trying to turn a previous SV filter into a notch, (Freq ~3.3 kHz, Q~10-20, see my mech. PID thread.) I was thinking of just subtracting the BP from the input. But almost all the web stuff I could find said add the HP and LP. (That seemed crazy to me, at high Q both those are peaking.. but then again the SV filter seems a bit crazy to me... two integraters in a row, come on. :^) S...