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  1. Minder

    Burned stepper motor driver board in my new Arduino project

    If you do not have an 'intelligent' stepper controller board, you can only use a voltage supply that is exactly required by the motor rating figure. When using an advanced type of controller, the voltage supply is typically very much higher value in order for the motor to maintain the exact...
  2. Minder

    Precor Treadmill controller help

    What was running off of 120v? The T.M. or just the board and motor? Post the picture. M.
  3. Minder

    Electric motor on planer quits running after 1 minute

    Gear puller is needed, M.
  4. Minder

    Electric motor on planer quits running after 1 minute

    If it runs for 5 mins and re-starts after a wait, it sounds like it has a thermal sensor, often embedded in the winding's. A ammeter would be useful in order to check the loading or reason for the apparent over-current. M.
  5. Minder

    RS422/485 and ground wire.

    The application I mentioned was in DIY CNC machine(s) so the run is usually less than 50m. As I mentioned in a previous post, I do use the ground where possible in longer runs. The point being made here however seemed to be the confusion as to whether the ground was mandatory in order for the...
  6. Minder

    Detecting horizontal position

    I have many East Indian friends and have no problem conversing with them at all!;) BTW the British first showed up in India before the Puritans landed in the Americas. And Australia was not settled at that time. The initial reason for the exploration of trade was the 'over night' hike in the...
  7. Minder

    RS422/485 and ground wire.

    Not the ones I have picked up on ebay, they have various types and configurations, as I said, the VFD's I use, there is only provision for the A&B lines on the unit. M.
  8. Minder

    Detecting horizontal position

    Incidentally India is the second largest nation of English speaking people in the world. India's official second language. Also maybe we British messing around there for 300+ years had some cultural effect!:D M.
  9. Minder

    RS422/485 and ground wire.

    But the output is just two terminals, A&B conductors. No available reference to 0v or GND. M.
  10. Minder

    Detecting horizontal position

    Surely if you only need a two position sensor, there is small magnet sensors such as Honeywell SS400 series, The have 3 or 4 different varieties, such as latch/unlatch, unipolar, bi-polar etc. M.
  11. Minder

    Searching for a 30A 36-42V DC (Emergency) switch.

    The arc, once struck can sustain itself once the air is ionized, I have witnessed the after effect of this where the adjacent aluminum panel had a hole burnt in it.! M.
  12. Minder

    Searching for a 30A 36-42V DC (Emergency) switch.

    Agree on the contactor, there are special relays to switch high current DC, they must have arc quench/blow-out of some kind. Otherwise a Plasma arc can occur. M.
  13. Minder

    RS422/485 and ground wire.

    The operative word in question is whether it HAS to be used, Systems that are operating with just two (A&B) conductors are working fine. I will add that where possible I either take the power common to each side where possible and/or use a grounded shield. But I have used the two conductor...
  14. Minder

    RS422/485 and ground wire.

    To complete a circuit you normally require two conductors, these two input to a amplifier similar to any op amp etc where only two conductors are required. M.
  15. Minder

    RS422/485 and ground wire.

    Galvanic isolation is complete isolation between one section of a system and another, for e.g. a transformer with a separate primary and secondary is said to have galvanic isolation. How would you explain all the RS485 devices out there that only have two terminations for the RS485 connection...
  16. Minder

    RS422/485 and ground wire.

    Most of the Technical sheets from the manuf. don't specify any return or common GND conductor. Texas Inst. M.
  17. Minder

    RS422/485 and ground wire.

    Not for me it hasn't, just two conductors A&B. If you happen to pick up the $1 USB to RS485 convertors on ebay they just have the two terminals only. If shielded cable, I just earth GND the shield only. M.
  18. Minder

    Fan making humming sound but not turning - CBB61?

    AKA Metallized polypropylene material, high insulation and suitable in withstanding over-voltage stress etc. M.
  19. Minder

    In what way toroidal cores are important for heavy transformer ?

    I have preferred Toroidal's for mains transformers for some years now, mostly for the advantages already mentioned. Adding over-winds etc, usually around 2 turns/volt. One thing to watch for that some have made the mistake of doing is to make a cover or clamp to chassis secured by the centre...
  20. Minder

    RS422/485 and ground wire.

    The date is sent between two conductors, that is all you need, in many cases the shield is connected to earth GND and/or to the common of the transmitting device, They may, or may not use the same supply, generally each has its own. M.
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