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  1. mchenney

    Step Drills

    These are step drills or unibits: http://www.tradetufftools.com/index.php?main_page=index&cPath=217_336&gclid=CN6pwdaW448CFRGCGgod6lUzCQ Great for non critical sized panel work, best used in a drill press w/ depth setting as to be safe. Greenlee punch set for consistant results for standard...
  2. mchenney

    What is the best analog input? 1-5V or 4-20mA

    Another reason to use 4-20 ma is for explosion proof applications, with fusing and voltage limiting as to stay below max VA power limits for group and division clasification. Source series fused at say .05 A and followed by a Transorb AC clamp diode, intrinzic safty block. Dennis McHenney...
  3. mchenney

    communication PLC S7-400H / Linux PC

    http://www.automationmedia.com/AutomationMediaOPCServers.asp Dennis McHenney mchenney@mindspring.com
  4. mchenney

    communication PLC S7-400H / Linux PC

    OPC program (Ole for Process Control) http://www.google.com/search?hl=en&rlz=1T4TSHB_enUS248US248&sa=X&oi=spell&resnum=0&ct=result&cd=1&q=OPC+linux&spell=1 Dennis McHenney mchenney@mindspring.com
  5. mchenney

    SNUBBER FOR SSR

    http://en.wikipedia.org/wiki/Transient_voltage_suppression_diode Transorbs are great for this. Dennis McHenney mchenney@mindspring.com
  6. mchenney

    electrons

    1) Each atom trys to keep the same number of electrons circling it's nuculus, staying in balance with other surrounding atoms. But the actual number is dynamic. 2) An outer ring FREE electron flys out of orbit in one atom and FLOWs to another atom that attracts and captures it into orbit. A...
  7. mchenney

    B&K Pulse Lite Front End Disconnecting, while running?

    Anyone else having problems with this? Dennis McHenney mchenney@mindspring.com <dmchenney@merkle-korff.com> <mchenney@mindspring.com>
  8. mchenney

    CIMplicity HMI -to multi GE MICRO on RS-485 multidrop

    CIMplicity HMI -to multi GE VersaMax MICRO on two RS-485 multidrops Anyone done this before and have any insight and pitfalls to pass along! I have worked with both, but never over RS-485 (single & multi server - resource Ethernet TCP/IP and single RS-232 I have done). I have dual port Quatech...
  9. mchenney

    AB PLC-2/20 PARTS

    SPARE AB PLC-2/20 PARTS 2 complete operational double rack systems removed from PLC upgrade and a 1770-TA programming terminal ITEM (CAT NO / PN ) Quantity POWER SUPPLY, CPU and RAM MOD 1772-LP2 ser A 1772-MEB 2 16 Slot Rack P/N...
  10. mchenney

    AB PLC-2/20 PARTS

    I did not say FOR SALE here! Have tried that with no response. May give to someone in need, if they cover the shipping and handling. I may try ebay before I do that though, now that you mentioned it. Dennis McHenney mchenney@mindspring.com <dmchenney@merkle-korff.com&gt...
  11. mchenney

    AB PLC-2/20 PARTS

    SPARE AB PLC-2/20 PARTS 2 complete operational double rack systems removed from PLC upgrade and a 1770-TA programming terminalITEM (CAT NO / PN )QuantityPOWER SUPPLY, CPU and RAM MOD 1772-LP2 ser A 1772-MEB216 Slot Rack P/N 635226-0128 Slot Rack P/N 635224-012PLC-2 I/O Adapters...
  12. mchenney

    Encapsulating/potting pcbs

    If good enough for your needs, use Krylon Clear Acrilic spay from your local HW store. Multi coats. Dennis McHenney mchenney@mindspring.com <dmchenney@merkle-korff.com> <mchenney@mindspring.com>
  13. mchenney

    Megger versus hi-pot testing

    try http://www.asresearch.com/ Dennis McHenney mchenney@mindspring.com <dmchenney@merkle-korff.com> <mchenney@mindspring.com>
  14. mchenney

    ENCODER/PLC INTERFACE

    For a GE VersaMax micro the first 8 HS inputs are configured as an A-Quad-B quadature input with A, B and HOME signals being applied. Examples are in the HW and VersaPro SW manuals. You get: Angular POSITION (EXAMPLE, for 360 line encoder = 1 / 1440 per revolution, 1/4 deg) Direction of...
  15. mchenney

    EE needs NOISE test help

    EE needs NOISE test help I am looking for a low cost off the shelf equipment to do production NOISE testing of small motors and gearmotors as part of an EOL functional one output shaft revolution test. The output would feed a GO-NO GO result to PLC input(s) or via PLC serial port. After 2.5 to...
  16. mchenney

    Low End Off the shelf FFT needed

    <dmchenney@merkle-korff.com> Has anyone ever used a PC sound card and the available share/freeware,or very low cost SW to do this? I know this is an option, but not sure how good it is? Can an OFF THE SHELF noise cancellation microphone system be used as a front end? Dennis McHenney...
  17. mchenney

    FFT equipment help

    EE needs NOISE test help I am looking for a low cost off the shelf equipment to do production NOISE testing of small motors and gearmotors as part of an EOL functional one output shaft revolution test. The output would feed a GO-NO GO result to PLC input(s) or via PLC serial port. After 2.5 to...
  18. mchenney

    Low End Off the shelf FFT needed

    <mchenney@mindspring.com> Looking for low cost off the shelf FFT, microphone input equipment to do limited go-no go testing of small DC gearmotors. Cycle time in 2-5 second range. Thanks PS: Also background noise cancelation microphones for front end Dennis McHenney mchenney@mindspring.com...

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