Search found 48 matches

by chapter30
Mon Nov 21, 2005 6:35 pm
Forum: General Discussion
Topic: 3 Phase Power Calculation
Replies: 4
Views: 1039

Re: 3 Phase Power Calculation

Thanks Robert. I'll check into a wattmeter. I like the idea of making a look up table too. I don't need to be super accurate, just close.
by chapter30
Sun Nov 20, 2005 11:47 am
Forum: General Discussion
Topic: 3 Phase Power Calculation
Replies: 4
Views: 1039

Re: 3 Phase Power Calculation

So the best way to measure real power is to set up a system that can measure the pf at the different frequency and voltage levels that the VFD will produce? Are there formulas available that can calculate this pf value based on known characteristics of the system? For example I will be able to calcu...
by chapter30
Sat Nov 19, 2005 3:39 pm
Forum: General Discussion
Topic: 3 Phase Power Calculation
Replies: 4
Views: 1039

3 Phase Power Calculation

I have some questions about calculating real power in a 3 phase motor when it's attached to a variable frequency drive. I have a formula from one of my old text books that reads like this. (I*E*1.73*pf)= P (in Watts) The VFD has an output for I and E that will go into my data system. The pf is print...
by chapter30
Tue Aug 23, 2005 3:17 pm
Forum: General Discussion
Topic: Digital Controlled Pressure Switch
Replies: 4
Views: 1048

Re: Digital Controlled Pressure Switch

Ahh yes,<p>Engineer1138 has it correct. I'm not interested in measuring the pressure. I am looking to port an air pressure to one of three locations. <p>Sorry for my absence on this board. I forgot all about this project.<p>Thanks for the advice.
by chapter30
Fri Aug 19, 2005 9:20 am
Forum: General Discussion
Topic: Digital Controlled Pressure Switch
Replies: 4
Views: 1048

Digital Controlled Pressure Switch

I'm looking for a component that will take a small pressure input and allow me to switch it through three different ports using some sort of electronic control. A 2 bit digital signal would be ideal but I can work with any type of input. Does anyone know of a product like this and what a generic nam...
by chapter30
Thu Aug 04, 2005 5:41 pm
Forum: General Discussion
Topic: car jumper cable question
Replies: 9
Views: 1647

Re: car jumper cable question

Optima makes a good line of deep cycle automotive and marine batteries that could be good for this application. I would suggest keeping the car runningwhen using an inverter that powerful.
by chapter30
Sun May 29, 2005 12:58 pm
Forum: Computer Programming
Topic: PIC Basic Pro Programming Class
Replies: 3
Views: 2740

Re: PIC Basic Pro Programming Class

I'll agree with Philba. The PIC Basic language is easy to pick up. I would suggest learning it on your own with the help of some project based books. Then, after you get a good feel for it maybe take an advanced class.
by chapter30
Tue May 03, 2005 6:27 pm
Forum: Robotics
Topic: Robot Batteries
Replies: 3
Views: 3111

Re: Robot Batteries

Thanks,<p>I will be lookig for these in surplus places due to the price.<p>Good plan.
by chapter30
Sat Apr 23, 2005 3:34 pm
Forum: General Discussion
Topic: looking for an advice regarding research paper
Replies: 14
Views: 2564

Re: looking for an advice regarding research paper

Human,<p>Most of my college work involved using text books but, as we all know, the web is great for doing research. <p>I'm not sure I understand what sort of info you are looking for but www.sparknotes.com is one website that I found very valuable to get me through the literature classes I had to t...
by chapter30
Wed Apr 20, 2005 5:07 pm
Forum: General Discussion
Topic: Computer as Oscilloscope
Replies: 8
Views: 2003

Re: Computer as Oscilloscope

I have a thing called a pico scope (brand name) that hooks up to my parallel port. It was cheap, about $60 if I remember right. I don't like it though. The software bogs down my computer and things tend to freeze up a few seconds at a time.<p>I ended up going the route that Dean mentioned...ebay. It...
by chapter30
Wed Apr 20, 2005 8:56 am
Forum: Robotics
Topic: Robot Batteries
Replies: 3
Views: 3111

Robot Batteries

I'm building a new robot platform and I want to see if anybody has suggestions for a good type of battery to use.<p>The robot will have two 12VDC motors each drawing 1.4 amps. Eventually there will be a large amount of low power electronics and a more power hungry arm attached.<p>I want to be able t...
by chapter30
Wed Apr 20, 2005 8:33 am
Forum: Robotics
Topic: Robotics club
Replies: 10
Views: 5244

Re: Robotics club

Thor,<p>This may be a good subject for a new topic.<p>Do you have two motors or servos? What type?<p>Also,<p>What type of controller are you using (if any).
by chapter30
Mon Apr 18, 2005 6:26 pm
Forum: Robotics
Topic: Request Example Program in C/C++
Replies: 5
Views: 3967

Re: Request Example Program in C/C++

Check this site out. I havn't looked at the code but I think it may help you.<p>https://www.zagrosrobotics.com/Index.asp
by chapter30
Sat Apr 16, 2005 9:04 am
Forum: General Discussion
Topic: OSMC
Replies: 4
Views: 1017

Re: OSMC

Thats what I did try. I couldn't sign up for some reason. I was always sent to a page that said "do you yahoo?" really big on it and nothing else. <p>I was wondering if there are other websites with info like schematics or other details.
by chapter30
Fri Apr 15, 2005 5:39 am
Forum: General Discussion
Topic: OSMC
Replies: 4
Views: 1017

Re: OSMC

From what I understand the project is strictly a DC motor controller that people have collaborated on. I want to see how far they have gone, check out the design and possibly make some changes/improvements to it for my application.