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  1. Minder

    Home Project wiring help

    You need to define Ground, do you mean power common or Earth ground? Two different things. 12vdc linear actuators are generally fairly low current motors due to the gearing involved The switch may be able to switch the motor directly as originally I assume it picked up a relay? Some kind of...
  2. Minder

    Air Compressor Controller

    If doing any projects such as this in the future, I would recommend obtaining a current copy of NFPA79. It is intended to show recommended methods and code details of NEC pertaining to industrial control. I also have the 2007 version in pdf. Here are a sample layout from it. M.
  3. Minder

    Motor Discussion

    Another example of CNC lathe XYC and Live Tooling at 1:15.. M.
  4. Minder

    Air Compressor Controller

    I thought some thing along these lines, you will modify it to suit, I assumed the dump valve was a pressure relief on the head, modify as needed. M.
  5. Minder

    Air Compressor Controller

    Tecumseh state that their 3 ph compressors Must include phase rotation detection otherwise it can be harmful and lead to premature failure of the compressor. It can happen if someone upstream or source of the supply happens to change the phase rotation. M.
  6. Minder

    Air Compressor Controller

    It would help to also know the nature of the timer, I made a wrong assumption on the Pr.Sw either a N.O. contact on the contactor or use the control relay if not enough contacts, and use this to trigger a on delay timer which will pick up the dump valve after the delay, this way every time the...
  7. Minder

    Air Compressor Controller

    I assume you want to have automatic restart when the PS resets after opening? You would normally have a series string consisting of a N.C. E-stop followed by a N.O. start P.B. that has a N.O. contact from the 3 ph contactor in parallel with the start, also the timer output contact across the...
  8. Minder

    Motor Discussion

    Have done it many times using high quality motion cards such as Galil and quality servo's, BLDC are capable of higher max rpm than DC brushed. Go to the Galil Motion site and check out the applications and instructional video's The reason the spindle slow down at 1:50 was the spindle has C axis...
  9. Minder

    How to control the speed of a 24vdc pump from circulating water temperature?

    A bit late to the party, but I would tend to agree with Sunnysky that you are going to need PID from such as a digital thermostat etc. They are much higher in the way of cost, but I suspect with the system so far the hysteresis could be all over the map? An added bonus is that most now...
  10. Minder

    Motor Discussion

    Steppers can also be 1/2 and micro stepped, but at a cost of torque. M.
  11. Minder

    Motor Discussion

    I assume you are using the term servo here as in RC application.? In a CNC a servo is very accurate and positioning with high rpm and continuous rotations. M.
  12. Minder

    Troubleshooting: Why the normally closed and normally open pin in my relay is shorted internally?

    If in doubt, read the instructions!;) M.
  13. Minder

    Need help identifying electronic!

    At a close look it appears someone has attached it to the conduit and not fed it from same, the twin lamp cord looks like it feeds some kind of transducer (speaker,squawker/alarm etc) etc. M.
  14. Minder

    Motor Discussion

    If you have already designed it and it works then generally the DC motor with encoder feedback is superior to stepper, but PID loop is required. Higher end CNC machines use servo's over steppers. M.
  15. Minder

    Troubleshooting: Why the normally closed and normally open pin in my relay is shorted internally?

    Another is if the relay has been used and the N.O. has welded to the common, this then shorts all three contacts. M. edit: make that N.O.
  16. Minder

    choosing micro fo BLDC motor speed control

    PIC18F2431 M.
  17. Minder

    Motor Discussion

    Stepper motor is the simplest as it requires no feedback, a DC motor for precise positioning requires the encoder with PID feedback to the controller. M.
  18. Minder

    Help with motion sensor and motor DC

    When you use a sensor, you need to know the nature of the output, i.e. open collector? NPN? PNP? If the device you are feeding to in this case a 2n2222 does not provide it, you have to supply it. An example of O.Coll, . NPN. M.
  19. Minder

    Help with motion sensor and motor DC

    But is it open collector? If open the 10k resistor from sensor collector to +ve and a 100ohm from output to Base. M.
  20. Minder

    Help with motion sensor and motor DC

    What is the nature of the sensor?, some are open collector ouputs (NPN or PNP) If so you would need a pull-up (or down) resistor. M.
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