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What are your views on powering plc inputs either from the field device or from the plc cabinet. Example being you kill the power on an mcc bucket if the plc input is powered from the bucket you'll have no other power source in it, if it were powered from the plc cabinet and you killed the...

How do you go about sizing resistors for a DC motor starter 2 point accelerating, I have a 2Hp and a 5Hp motor. Are there predetermined resistor sizes for different number of steps or is there some formula to determine the size resistor?

Anyone know of any DC motor starter manufacturers?

I've been in the control systems field for about two years now and I am about to finish up my degree in electrical engineering and was wondering if ISA was a good organization to join. What are the benefits of being a member? Thanks Micky www.controlconceptsllc.com

Is there a way to select text in a AutoCAD drawing and paste it into notepad, or word?

Anyone know of a maufacturer of DC motor combination starters? If not how can you put overload protection off a regular contactor and make it into a DC motor starter. I know current is current but if you use a thermal overload relay as overload protection how much cooler does DC current run...

I keep getting the error message "Dialogs are not available because DCL files are not loaded" when using custom menus

Is it possible to change the default of how coordinates are entered? Instead of using the @ symbol, just put in the next coordinate without the @ symbol and it would automatically be relative to the previous point and not the origin and when you would use the @ symbol then these coordinates...

I am wanting to use Radio Frequency Identification (RFID) to keep track of how long log trucks are in the mill and where they are at. I am need this info to be fed back into an Allen Bradley PLC. Anyone ever use this and have any info about where to start.

Anyone have a good source(s) to download CAD blocks for valves, gauges, purge meters, tubing fittings, etc.?

Where can you find a list of symbols denoting how each type of metal such as an I beam or c-channel etc is denoted. We have some drawins of switchracks with C6, W6 etc and was wondering where you could find out what these mean.

I'm electrical not to good in thermo, so heres my question. I am needing to calculate the size of an enclosure for a VSD, I know how many BTU's are being put of by the drive, but I need to how many BTU's are being put off by the change in temperature between the desired inside temp and actual...

Can you specify which folder for all your .sav and .bak files in AutoCAD 2002 to save to rather than the same folder as the .dwg?

Kinda new to CAD work, just wondering how long it takes to do a drawing of schematics and wiring diagrams. How long would it take you to do the posted drawing, just curious to see if I have a lot to learn as far as efficency goes. http://controlconceptsllc.tripod.com/images/SS3.JPG

I'm in the process of coming up with a 3 motor alternating scheme with a trip indicator. I am wondering if it is possible to do it with relays or if it would be easier to use a PLC.

How do you rotate viewports?

Is the a place where you can see where diferrent metals react with each other. Like what metals to not use on aluminum etc

Why when you insert a block into a layout in Autocad 2000 you are unable to use the attributes? I created titleblocks with attributes but when I insert them in to a layout the attributes wont display.