Log In
Join
Join the Community
Register
Log in
Or sign in with
Facebook
Google
GitHub
Linkedin
SIGN UP FOR OUR NEWSLETTER
Register
Main Menu
Home
Explore
Products
Cabinets & Panel Components
CNC Machines
Communication & Security
Connectors, Wire & Cable
Data Analytics & Simulation
Electrical Power Control
HMIs & SCADA
Motors & Controls
PLCs & PACs
Pneumatics & Hydraulics
Robotics
Safety
Sensors & Instruments
View all
Industry
Advanced Mfg
Agriculture
Automotive
Building
Chemical
Electronics
Energy & Infrastructure
Food & Beverage
Forest Products
Logistics
Medical & Pharma
Metal
Military & Aerospace
Natural Resources
Plastics & Polymers
Product Mfg
View all
Content
Ebooks
Forums
Industry Articles
Industry Webinars
Industry White Papers
News
Partner Content Hub
Technical Articles
Textbook
Tools
Worksheets
Articles
Latest
News
Technical Articles
Industry Articles
Industry White Papers
Forums
Latest
General Discussion
Hardware
Software
Communication
Education
Textbooks
Video Lectures
Worksheets
Industry Webinars
Ebooks
Tools
Videos
Latest
Industry Videos
Industry Webinars
Video Lectures
Giveaways
Partner Content Hub
Contact Us
Register
Log In
Network Sites
Search...
Home
Search
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
Search results
Search everything
Search threads
Search blogs
Keywords
Search titles only
Posted by
You may enter multiple names here.
Newer than
Search
Help requested with Mitsubishi FX2N PLC for PID control
The main problem with be the poor input resolution. Given what you have got I would not even try using a PID. A simple on-off control, like what is used for room temperature control, should be good enough.
pnachtwey
Post #15
Jun 18, 2021
Forum:
Programmable Logic Controller - PLC
MOOG Servo Valve
The valve is a pretty good valve for most purposes. Fortunately CSA posted a link to the pdf. (good going CSA). Judah, you should always post a link to the valves you are using yourself because sometimes the valve data is hard to find. Judah, use an ohm meter to measure the resistance of...
pnachtwey
Post #6
May 25, 2021
Forum:
General Automation Chat
PID design of a BLDC motor control can't be completed using Ziegler-Nichols because the slope doesn't match with wath is seen on the step response
There is nothing to be impress with so far. if you have the open loop transfer function then use pole placement. I could have done it hours ago since the open loop transfer function was provided. However ,the OP wants to use Z-N which is a crime against control theory. Gains can be...
pnachtwey
Post #6
May 23, 2021
Forum:
General Automation Chat
PID design of a BLDC motor control can't be completed using Ziegler-Nichols because the slope doesn't match with wath is seen on the step response
You don't say if you are tuning for position or velocity control. It makes a difference. The whole concept of Ziegler Nichols should be banned and since you have an open loop transfer function, you definitely shouldn't use Z-N. You should use pole placement. I don't understand what you are...
pnachtwey
Post #2
May 23, 2021
Forum:
General Automation Chat
Question about Temperature Control
All those rules and yet the root locus does not provide gains. When it does it provides only one which is OK for governors and similar but not controllers like a PI or PID. There is one more issue that instructors don't mention when they talk about the break away point. That is the point...
pnachtwey
Post #18
Mar 7, 2021
Forum:
Instrumentation & Measurement
Question about Temperature Control
No, not directly. However, the integrator will compensate if the hysteresis is small. If the hysteresis is a problem then an offset can be added or subtracted from output to compensate depending on the direction of change. You should look at my YouTube channel, Peter Ponders PID. It is not...
pnachtwey
Post #16
Mar 7, 2021
Forum:
Instrumentation & Measurement
Question about Temperature Control
A heat exchanger is non-linear, not multi dimensional. The dead time is small enough where a Smith Predictor isn't required. It is easy enough to account for the changing gains of a heat exchanger. Most of the time the heat exchanger is controlling at only one temperature so it is easy...
pnachtwey
Post #13
Mar 6, 2021
Forum:
Instrumentation & Measurement
Question about Temperature Control
This isn't so. The derivative may 'speed things up' but the real purpose is to the place closed loop poles. If you place the closed loop poles away from the origin then errors will decay faster. The controller gains are used to closed loop poles. The goal is to place the close loop poles as...
pnachtwey
Post #11
Mar 6, 2021
Forum:
Instrumentation & Measurement
Model Predictive control -CARIMA Model (Discrete transfer functions)
I would watch this. https://apmonitor.com/pdc/index.php/Main/ModelPredictiveControl The key is to start with a good model. I used differential equations for the model because they are more flexible. To get the model you must first perform a system identification. This is necessary for...
pnachtwey
Post #7
Mar 5, 2021
Forum:
Electrical Engineering
Question about Temperature Control
I agree with Dave. Sampling often does not solve the dead time problem. It is easy to calculate the controller gains that will not cause overshoot if the SOPDT parameters are known. The formula for the controller gain includes the dead time in the denominator so as the dead time increases the...
pnachtwey
Post #9
Mar 5, 2021
Forum:
Instrumentation & Measurement
Question about Temperature Control
You shouldn't use a delay. However, the system may have a dead time or a delayed response to any control signal. There are methods for compensating for long dead times. One method is a Smith Predictor. The other is MPC or model predictive control but both methods require a pretty accurate...
pnachtwey
Post #3
Feb 26, 2021
Forum:
Instrumentation & Measurement
PLC program for Industrial Robot control
I don't know what you could write about that would be worthy of a Master Thesis. PLCs are tools. Tools change. What is valuable is the underlying knowledge like math and physics that will never change. What would you have written about 10 years ago or 20 years ago? Structured text is yet...
pnachtwey
Post #4
Feb 8, 2021
Forum:
Programmable Logic Controller - PLC
One PID connected to 2 actuators
This makes no sense. In the first case why slow down the pump? In the second case why speed up the pump? It seems the pump is doing the opposite of what you want to do in both cases. Why not leave the valve position constant and just control the pump. If I wanted to get tricky I would start...
pnachtwey
Post #4
Jan 31, 2021
Forum:
Process Control
Can someone tell me how does flow rate still remain constant when Q=VA?
The question is asked without context. The Bernoulli equation states that when flow enters a restriction the flow will increase because the mass flow must be constant. The mass will decrease but the energy of at the restriction stays the same due to the kinetic energy of the flow. Q=VA work...
pnachtwey
Post #3
Jan 25, 2021
Forum:
Instrumentation & Measurement
How do I learn to use Linux?
I have a better idea. I have recently installed Virtual Box on my computer. I have installed MX Linux and Mint Linux as VMs. It is easy to switch between them to compare. Also, if I screw things up I can just restore with my backup copies. There are plenty of videos on YouTube about...
pnachtwey
Post #8
Jan 2, 2021
Forum:
LinuxPLC Project
How to develop Teach pandent for robotic arm
I would use C or C++. You better be good at math. It is one thing to save the positions you 'teach'. It is much harder to do the interpolation between the points at a desired speed.
pnachtwey
Post #2
Jan 2, 2021
Forum:
Robotics
WHAT IS THE VALUE OF 'k' IN BERNOULLI'S LAW FOR SQUARE ROOT EXTRACTION q=k*sqrt(dp)
Did you search the internet first? https://www.hydraulicspneumatics.com/technologies/hydraulic-valves/article/21887929/the-valve-flow-constant
pnachtwey
Post #4
Nov 28, 2020
Forum:
Instrumentation & Measurement
How do I learn to use Linux?
The best distro depends on what you want to do. I prefer linux distributions with Debian roots. If you are making a linux virtual machine then Debian with xfce is a good choice. After that some people link ubuntu or mint. These are good if you have a powerful PC. I use Debian xfce to...
pnachtwey
Post #4
Nov 25, 2020
Forum:
LinuxPLC Project
Transfer Function of a AC servo motor
I wonder who George Younkin asked when there wasn't an internet. I actually have a signed copy of George Younkin's book however, I don't agree with some of the things that are in the book. There are a lot of calculations and way too much to post on a forum. I would suggest finding newer sources...
pnachtwey
Post #11
Nov 4, 2020
Forum:
Motion Control
Settling time
What answer did you get for 4 time constants and a dead time? I can see the answer instantly but I have been at this for awhile.
pnachtwey
Post #4
Nov 2, 2020
Forum:
Electrical Engineering
Prev
1
2
3
4
5
Next
First
Prev
4 of 5
Go to page
Go
Next
Last
Top
Continue to site
QUOTE OF
THE DAY
“
”
-