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SAK9. Thank you very much for the help, much appreciated. Craig

I have the following system: BL-1, BioPharm, cell culture production. 50,000 S.F. suite of clean rooms Two ~ 40,000 CFM AHUs; 100% outside air 100% exhaust with no heat/cooling recovery The New England facility was commissioned last fall. Under certain powdery snow conditions, and we had...

David, Thank you for the help. Much appreciated. Craig

Mech. Eng. here... Being asked to install a guard on E-Stop switch. Are there professional and/or regulatory guidelines for the design of E-stops? Thanks, Craig

Warpspeed, Thank you very much for the suggestion for the reference book. I'm always thrilled to find those gems that cut to the heart of engineering applications. Much appreciated, Craig

He's an ace programmer and very good at start-up. It takes all kinds. :-)

cjeffra and KenRad, Thanks so much for the procedure and clarifications. I was able to do the loop tuning easily. I like the 9100's ability to be operated from the panel. The J-C M-5 networked interface is slow to update(~20 sec). The controller update is immediate and informative...

KenRad and cjeffra, Thank you very much for the information. Sorry for the delay; I've been on vacation. I'll use the above tomorrow when I get back to work. I'll let you know how it goes. Thanks again, Craig

Hello, I'm a MechE with 15 years of clean-room experience. I have just started a new job where I'm commissioning a suite of clean rooms. The system is a Johnson Controls(J-C)"Metasys M-5" with "DX-9100" controllers on the AHU's. I have not used J-C systems before. The J-C controls guy will...

I've used the formulas in this publication to calculate the Psychrometrics: http://web.umr.edu/~tien/218/Chap2.pdf

Hello, It's been a while, but I'm still plugging away at finding an affordable electric force actuator design. Thanks again jraef and jbartos for the ideas. I've gotten the electric actuator test rig assembled and running. This is a 1/2 HP(0.4 KW) motor driven by a TBWoods "Variable...

Here's what I did: ...got the cylinder/spool-valve mounted with the spring. Below is a schematic of the basic components. It's not an exact component representation, just basic concept. Here's the rig: Here's a movie of the thing running: http://simhardware.org//img/steering_rack02.WMV

Hi jraef, Thanks for the link. the Adam-5000 looks pretty interesting. I think you'd be supprised what you can get on eBay. http://search.ebay.com/search/search.dll?cgiurl=http%3A%2F%2Fcgi.ebay.com%2Fws%2F&krd=1&from=R8&MfcISAPICommand=GetResult&ht=1&SortProperty=MetaEndSort&query=1746-NI4+...

Found this on the web: http://www.wittenstein.aero/e/pdf/WITT-100_activerudder.pdf The "force transducer" is called "control loading". Seems they also like the EE approach. :-D

jraef, I just noticed I didn't answer this: "I use this to apply force feedback to things like rudder pedals and joystick. I'm looking to apply forces in the 200-300lb. ballpark." Did you mean inch-pounds or foot-pounds? Yes, 200 -300 lbs force. WWII fighter plane develope...

Hi jbartos, I feel like you EE's are ganging up on my mech. design. :-D One of my main design criteria is price. I'm looking to do this with cheap consumer products or components bought on eBay. I've been watching 1 phase to 3 phase speed controllers on eBay and it seems they can be had for...

Hi jraef, Sorry not to get back sooner, been real busy. I'll try to explain better the concept. I have several places in my simulator where I'll need these "force transducers". I need to apply a force over a range of motion. Here's a sketch of the pedals...

jraef, Thanks so much for your time, really appreciate the help. What do you think of this hair-brained idea? http://mysite.verizon.net/vze323mw/sitebuildercontent/sitebuilderpictures/elec_force_acuat.jpg Calc the force from the compression/extension of the spring and control the rod position...

jraef, Thanks a bunch. I've been very intrigued by the suggestion in you're first post. If I understand it correctly, you apply enough power to a motor to output a desired torque. You can stall a motor like this continuously? If so, does it take a certain type(i.e. 3 ph, DC, etc.) It'd be...

PLucas, Thanks for the link. I'll check out the forum.