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  1. ROCHESTER

    Snow --> AHU intake

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

    Snow --> AHU intake

    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...
  3. ROCHESTER

    Emergency Stop Switch

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

    Emergency Stop Switch

    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
  5. ROCHESTER

    Johnson Controls -- PID tuning

    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
  6. ROCHESTER

    Johnson Controls -- PID tuning

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

    Johnson Controls -- PID tuning

    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...
  8. ROCHESTER

    Johnson Controls -- PID tuning

    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
  9. ROCHESTER

    Johnson Controls -- PID tuning

    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...
  10. ROCHESTER

    lbs/hr of steam

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

    Hello, I'm an HVAC guy with a ho

    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...
  12. ROCHESTER

    Hello, I'm an HVAC guy with a ho

    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
  13. ROCHESTER

    Flight Simulator PLC Control

    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+...
  14. ROCHESTER

    Hello, I'm an HVAC guy with a ho

    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
  15. ROCHESTER

    Hello, I'm an HVAC guy with a ho

    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...
  16. ROCHESTER

    Hello, I'm an HVAC guy with a ho

    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...
  17. ROCHESTER

    Hello, I'm an HVAC guy with a ho

    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...
  18. ROCHESTER

    Hello, I'm an HVAC guy with a ho

    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...
  19. ROCHESTER

    Hello, I'm an HVAC guy with a ho

    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...
  20. ROCHESTER

    Flight Simulator PLC Control

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

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