Tagged Questions

A PID controller is a (closed) control loop feedback mechanism. It is used in industral control for proportional, integral and derivative feedback.

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25 views

Help with PFM with PID Control on dsPIC30F2020 (Pulse Frequency Modulation)

I'm using the dsPIC30F2020 trying to do a project that compares and contrasts PWM and PFM bucks converters. I have the PWM buck converter working perfectly. So for the PFM I used the exact same code ...
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55 views

24VDC servo motor does not start

I have a 24VDC servo motor (servo motor specs) I want to use to move a small linear stage. The servo output is 20,6W. It requires 5000steps per revolution. I have the motor connected to a servo ...
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1answer
85 views

Temperature stabilization with PWM , PID controller with delay system

I am doing a project to control the temperature with PWM. I use peltier, thermistor,mcu and h-bridge mosfet. I want to reach a temperature with an error less than 0.05 and stay at that temperature ...
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26 views

Converting PID value to Kp Ki Kd from CENTUM 3000 YOKOGAWA

Here it is, I got the values of Proportional Band (PB) = 500 and Integral (I) = 10 from Non-Interactive PID Controller. What i need is to convert those values into Kp and Ki. I have already known that ...
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1answer
52 views

Desired response of PI controller in motor vector controller

In vector control (field-oriented control) of motors (specifically induction motors), a rotating reference frame is attached to the rotor flux to give "DC" values in the current controller. This ...
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38 views

Anti-windup scheme for PID controller [duplicate]

this is the designed pid controller and i am using TL084 op-amps which has +15 volts and -15 volts as their supply. when the error is generated, due to integrator the control signal(Vc) output is ...
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4answers
133 views

Anti-wind up scheme in the implementation of PID controller

I want to implement designed PID controller. But I am facing the problem of how to limit the saturation limit in both positive and negative direction? I tried using zener diode, but I would like to ...
1
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1answer
61 views

How to calculate the reset time?

I have a little difficulty on my project. Can I calculate Reset Time (Ti) if I just had the value of P gain, I gain, D gain, Process Variable, and Manipulated Variable? Is there any reference about ...
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2answers
230 views

How to calculate Kp, Kd and Ki?

The motor operates within 140 rev/min to 600 rev/min. The controller gives an output in the range 4 to 20 mA. The sensor output reading equivalent to 400 rev/min, actual reading was 404 rev/min. The ...
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2answers
177 views

Controller for a Brushless DC motor (with ESC)

I have one of those BLDC Motors which are used in quadcopters and also an ESC to control it. I give it a PWM signal and it outputs the necessary condition for the motor to spin (AC signal). The first ...
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2answers
399 views

Cascading PID DC Motor Position & Velocity Controllers

I'm trying to build a robot with a differential drive powered by two DC motors. First I implemented a PID Controller to control the velocity of each motor independently. Estimated the TF using the ...
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3answers
504 views

Can PWM be used for PID controlling…

I am was wondering if an IC like the PCA9685(Datasheet) that generates PWM signals can be used in a PID controller for controlling a heated bed on a 3D printer. My understanding of PWM is that it ...
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2answers
183 views

Electronic Speed Control Concepts

I am a programmer who has never worked with electronics before. I am learning the concepts and hoping to build a quadcopter, with the control software entirely written by me. Motor control seems to be ...
0
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1answer
259 views

PID-controller and Ziegler-Nichols Method: How to get oscillation period?

I'm a bit confused about how to measure the oscillation period of a quasi-stable system when using the Ziegler-Nichols method to get the correct PID configuration. The factor of the oscillation period ...
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0answers
32 views

PID CH402 vs CD101 for Sous Vide - Will CH402 work? Item: CH402FK02-V*AN Reverse Operation

I'm following a Sous Vide guide, and I need a "Digital PID temperature controller model CD101, PT 100 support and voltage pulse output". I bought this a PID on eBay which is a CH402. I have NO ...
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2answers
143 views

Quad copter - from PID values to motor power

I am struggling with a completely self built/written quad copter I am working on. I am working on the PID controller for balance, right now just with a P value and it only reacts on ROLL and PITCH ...
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1answer
834 views

Peltier heat resistor temperature controller, schematic issue

I've been having a problem with the following schematic: What I need to do: Two temperature controllers in order to create a temperature gradient. The hot side is a a little above room temperature ...
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2answers
381 views

Control servo motor via PID to stabilize a robot wheel using IMU

I'm trying to stabilize a robot with a servo motor attached to two wheels of a robot. I already built the system as following: Apply Kalman filter to gyrometer/accelerometer output Calculate a roll ...
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1answer
86 views

What is a suitable device for fast temperature process control?

Here is a ceramic heater catalog: product sheet These heaters can ramp up as fast as 150 degrees C per second. I am not entirely sure what I am searching for but let's look at my use case: Say I ...
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2answers
71 views

PID controller of a known system model

When we know the impulse response of a system, we know all the equations needed to find an output of the closed loop system. So, theoretically we can find the perfect or at least a very good PID ...
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1answer
73 views

PID Parameters effect while tuning

We aways find lots of materials which explain various methods of tuning a PID controller. Also, it is not hard to find out what are those parameters. Once I've read that P and D parameters, in ...
1
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1answer
146 views

PID controller modelling

According to the following simple PID control system: We could create the equation: $$(R(s)-Y(s))C(s)P(s) = Y(s)$$ Wich will lead us to $$\frac{Y}{R}=\frac{CP}{1+CP}$$ So, if we want to ...
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1answer
77 views

Transfer function - get rid of zero

I have a close loop transfer function, consisting of a system and a controller (PID). For some reason does it create 2 zeroes which creates an undershoot which should not appear at all. I don't ...
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0answers
103 views

PID tuning method

I am trying to design a PID controller, to get the response I want to, so I am beginning to think that my approach with tuning the values might be incorrect. I have to Design a controller for the ...
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3answers
176 views

Cost-sensitive way to maintain a 220C temperature

I'm building a device which is designed to be built by people of varying skill and education levels. Part of it needs to climb to and maintain a temperature of 220C, but I don't need very tight ...
0
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1answer
236 views

PID gains from the transfer function of a plant

I am trying to calculate gains ( Kp, Ki, Kd ) of a PID controller. I have to improve the response of a plant. I already have the Transfer function of the plant. I was wondering if matlab has some ...
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2answers
139 views

Does the use of PID controller require knowledge of plant's Transfer Function

As simple as that. I assume that you use PID when you do not know the Transfer Function of the system, otherwise you use it and plug it directly in the closed-loop control.
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1answer
50 views

Can you implement a control algorithm and send the inputs via xbee?

I know this question is little bit vague, but let's say that I have a robot or a quadrotor to control. I want to implement the control algorithm (PID, robust, or LQR) in the PC not in the robot/quad, ...
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1answer
283 views

Astrom-Hagglund Relay PID tuning - relay transfer function?

I'm implementing a PID temperature controller on a PLC. To cut down on installation time (this design may be reused many times), I want to have the PID parameters tuned automatically rather than ...
3
votes
3answers
302 views

Motor Control with PMW or RPM on heavy robot

I'm going to try to explain my problem as clearly as I can. I have been building a robot that has four wheels, 2 motors and 2 free wheels. Its a differential drive system. ...
2
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1answer
232 views

Proportional controller

Sirs, I am not able to understand why Proportional controller introduces offset.Please consider follwing paragraph I found on internet, credit to ** http://blog.opticontrols.com/archives/344 **, ...
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2answers
481 views

Arduino. How do I limit the output value of a PID controller? [closed]

I have the following PID algorithm I snatched from a website whose name I forgot and I need to limit the output such that its maximum value is, let's say, 90. How do I do that? I tried using Arduino's ...
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0answers
110 views

PD control (PID without I) - Homework help

I've been given a system - x" = bx′ + kx + ru and I've been asked to rewrite it in the canonical form x' = AX + BU. I've got -- ...
2
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1answer
274 views

Difference between online PID and offline PID tuning?

I've been reading about PID control on the internet lately (Wikipedia). I came across the words 'online' and 'offline' in PID tuning. I googled it but couldn't find anything. What does this mean in ...
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2answers
251 views

Is PID ok to control motorized faders?

I have ALPS motorized faders + Arduino + H-Bridge setup. I first controlled them using simple algorithm ( if delta>0 move right ). Results were quite good. I tried to use PID to control them also ...
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0answers
80 views

How to deal with unstable pole?

I'm trying to use PD control to keep an inverted pendulum centered, by attractive electromagnets mounted as a radial magnetic bearing. The control is cascaded into an inner current control loop and an ...
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0answers
84 views

Is it okay to rapidly switch on and off a DC adapter

I have a thermoelectric coller I've converted to a heater which I usually use a normal thermostat to control. I've just upgraded to a PID-based controller which of course is going to be switching ...
4
votes
3answers
116 views

Control System - Changing damping on-the-fly?

I'm trying to implement a PID algorithm on a microcontroller that controls an actuator with a hard physical limit. In MATLAB, there's no consequence to large overshoots/hitting saturation at high ...
3
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1answer
391 views

PID implementation for a Humidity controller

I'm working on a humidity controller which uses PID algorithm to control the process values. I have to implement 2 PID routines as there are 2 process values ( Humidity and Temperature) to be ...
0
votes
1answer
450 views

Cannot integrate PID in my Quadcopter? Is this the right way?

I am working in my quadcopter. Right now I am just testing for take- off and Roll angle. I tried to integrate PID library in my code but it keeps generating 100 and my quadcopter goes blasting. Right ...
2
votes
1answer
813 views

Converting an ADC value to equivalent Temperature?

I'm working on a humidity controller which also controls the temperature inside a chamber.I'm done with the hardware (though i'm not the one behind the design)and which was originally designed with ...
8
votes
3answers
594 views

How does control theory apply to my real-world processor-controlled boost converter?

I have a limited understanding of control theory. I dealt with poles and zeroes and transfer functions in school. I've implemented several microprocessor-based control schemes for DC/DC converters. ...
0
votes
1answer
170 views

PID controller algorithm for sr90 digital controller

I am trying to implement PI control algorithm in c#. I found some help in internet and i understand the formula how to use. I have measured value(PV)= 20 °C and set point (SP)= 80°C; I would like to ...
2
votes
3answers
628 views

Are there any microcontrollers with integrated H bridge for DIY servo?

I want to build my own servo system. It will get a PWM as input then move an object according to this input. I have a motor, potentiometer feedback, microcontroller with separated H-bridge. Since I ...
3
votes
1answer
247 views

How to move lot of items with one microcontroller?

How to build a project that move lot of objects like this one http://www.youtube.com/watch?v=go2mZnRPqnQ ? Note : This question was different at the begining, but it was confusing and Anindo Ghosh ...
3
votes
1answer
233 views

What component should I use to build my own servos?

I want to create an array of linear actuators for an art installation. The easiest thing for me would be to send a PWM for each actuator. I think of using chips like TM1809 or WS2811 those chips are ...
0
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0answers
66 views

PI loop design for 2nd order system

I have a plant system which is 2-pole and 0-zeroes for which i want to control two different parameters. So, I'm trying to design two PI loops in feedback one for each parameter which will make ...
4
votes
1answer
190 views

PID controller, tuning and creation

I have been having some good success with my first PID controller. It seems it needs just a little bit more work. Below is a picture of a sample run with my controller implemented. Currently I only ...
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1answer
173 views

Problem with PID tuning

This is the step response of the power stage of a buck converter. I tried tuning it when i added a proportional term, the rise time and settling time improved.So kept on increasing Kp and the ...
2
votes
1answer
644 views

Simulating PID controller in Matlab

I am trying to explore PID control with a simulation. My problem is that the derivative term does not behave as expected in my simulation: No matter how large its coefficient it seems unable to ...