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  1. afterhrs

    Long Range Motion Sensor / Zero Speed

    You might want to check out the new Keyence PX-series infa-red optical sensors. If memory serves, they claim to have one that can read up to 40 M',they are dirt resistant and IP-67 rated. The one I had demonstrated can see thru your finger. Keyence is not cheap, but they do make some nifty...
  2. afterhrs

    Benefits of NEMA rated control relays versus IEC

    Here some practical factors to consider when you are determining which spec. to use. 1)Life cycle of the equipment. a)IEC = shorter cycles, 5yrs or less. b)NEMA = longer than 10 years 2)Enviroment. a)IEC = packaging operation. b)NEMA = steel mill/foundry. 3)duty cycle. a) IEC =...
  3. afterhrs

    The worst of VFD's

    Maybe a stroll down memory lane may be of some help, I dont know of any indidviduals that use a VFD for that sole purpose. thread 237-74246 Best regards, Afterhrs
  4. afterhrs

    What is the best engineering advice you ever received?

    Tinytim22, " Computers dont't make mistakes, but people entering data do" If this was true, companies wouldn't need I.T. departments. It was either the computer or a woman, I just know it! I can't find my lost shaker of salt! Regards, Afterhrs
  5. afterhrs

    Naval AC power

    IRstuff, For the high volume manufacturing sector, you are absolutely correct. When it comes to many other arenas, incuding the machines that are used for manufacturing, I will continue to employ this philosophpy. [cheers] Very best regards, Afterhrs
  6. afterhrs

    Naval AC power

    IRstuff, Explain, I am always willing to learn!
  7. afterhrs

    Naval AC power

    SSN-702 U.S.S Phoenix It was an invaluable experience, I was taught this phrase that I still use to this day. You get what you INSPECT, not what you EXPECT. Regards, afterhrs
  8. afterhrs

    Naval AC power

    ScottI2R It has been over 10 yrs since I was on a boat(submarine). I will say that we used 400 hz for cooling fans and various other "items." In my world, I understood the reasoning to be a size driven issue and the weight was just an added benefit. Regards, Afterhrs Ask me no...
  9. afterhrs

    Help - project for a electrical newbie. - Fan , Switch, Battery

    Is that marksmanship or paintsmanship..... Regards, afterhrs
  10. afterhrs

    What is the best engineering advice you ever received?

    This one is for the people that will appreciate a collision between a redneck saying and the human side of engineering "Be careful when being mean to people and critters, they just might learn thier lesson." This saying is the southern take on Confucius. Regards, Afterhrs
  11. afterhrs

    Help - project for a electrical newbie. - Fan , Switch, Battery

    Or you could get a back pack, a smaller 12v battery(lawnmower), and purshase some defrosting strips that are used in the rear windows of vehicles. I bet a clever guy like you could even arrange the defrosting strips in some sort of crosshair pattern to improve your marksmanship. Regards, Afterhrs
  12. afterhrs

    Voltage Drop when starting large motors

    I am curious to know if you added an additional 1kva transformer to the control cabinet when you added the SLC-5/04
  13. afterhrs

    What is the best engineering advice you ever received?

    This one has helped me immensely. You get what you INSPECT, not what you EXPECT. Great thread! Afterhrs
  14. afterhrs

    Capacitors containing PCB's

    One more thought, go to the Chemical or Enviromental engineering forums and ask the same question. Best regards, Afterhrs
  15. afterhrs

    Capacitors containing PCB's

    ScottI2R, I hope you work for a company that keeps excellent records. I would get the serial number from each machine sold to that customer and check the bill of material in the original build specifications. The bill of material might also include the date and companies for all purchased...
  16. afterhrs

    MechE trying to understand VFD operating numbers!!

    cnuk, If you still have issues with this drive, do not hesitate to call the local rep. A VFD can become your worst enemy or best friend, the key is to choose the correct parameters for your application. Good luck, Afterhrs
  17. afterhrs

    book on controls

    "Electrical/Electronic Systems" by Mazur & Proctor "Electrical Principles and Practices" by Mazur & Zurlis Regards, Afterhrs
  18. afterhrs

    MechE trying to understand VFD operating numbers!!

    cnuk, Check your wiring also, I have witnessed a 230 VAC VFD run a motor wired for 460 VAC. The motor would stall under heavy load and be cool to the touch. I added a few grey hairs on that problem. Regards, afterhrs
  19. afterhrs

    MechE trying to understand VFD operating numbers!!

    cnuk, I agree with hoy7t, something is definitely NOT correct with your application. The first sign is that you state you have a 20 HP motor running at 30 HZ, 230 VAC, and 32 AMPS. The approximate full load amp rating for a 20HP motor at 460 VAC is 27 AMPS(see Ugly's,page 39), 32 AMPS is a...
  20. afterhrs

    Voltage Drop when starting large motors

    BOBDELL, When is the last time your facility had an electrical infared survey completed? Regards, Afterhrs

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