Search results

  1. Minder

    3 Phase Motor - 3 Individual Circuit Breakers - Detect if 1 Breaker Tripped And Shut Down Motor

    It may also contravene N.A. NFPA70/NFPA79, EU and BSI regulation compliance . Max.
  2. Minder

    Is there a name for this type of motor ?

    I should have added however, that the three types described, in spite of having brushes were AC induction only. i.e. Non-Universal. M.
  3. Minder

    Is there a name for this type of motor ?

    Those were quite common Many decades ago and consisted of three types, (1) Repulsion-start, Induction-Run (2) The Repulsion Motor (3) Repulsion-Induction motor. They each have their own characteristics of course. The movable brush version was to enable reversing of the motor. Some had a brush...
  4. Minder

    3 Phase Motor - 3 Individual Circuit Breakers - Detect if 1 Breaker Tripped And Shut Down Motor

    I am still not clear why you cannot use a simple standard 3ph O/L on the contactor output? They come with adjustable current range and can be had in a stand-alone type as well as fit to the bottom of a contactor. Commonly have 1 N.C. & 1 N.O. control contact. M.
  5. Minder

    Wiring common ground for 7 components on enclosure lid

    Unwritten law of system building: Any estimation of enclosure sizing will always turn out 30% too small. M.
  6. Minder

    Anode and Cathode

    Also see Electron flow and conventional flow. Blame Benjamin Franklin! M.
  7. Minder

    Help me hijack a brushless DC motor from a cordless drill

    There are BLDC and ECM motors that operate without physical sensor, they generally exercise the motor at power up to sense rotor position and from then on detect electronically. The typical ECM motors used in HVAC blower systems operate this way. The most definite way, is the hall sensor. M.
  8. Minder

    Need Help Identifying PCB Mounted Transformer

    Many of those types of transformer have a thermal fuse embedded in the windings, with some luck you can detect the two ends of the fuse and short them out to test, transformers seldom fail open, usaully shorted. M.
  9. Minder

    Help me hijack a brushless DC motor from a cordless drill

    Almost impossible to speculate from a distance, if you can locate the three hall sensors and their supply then it should be possible to use practically any common BLDC controller that receives hall sensors. Probabally some more reverse engineering is needed! M.
  10. Minder

    45 amp Battery looking to prevent arc flash.

    You could try a suitably sized magnet close to the contacts, acting as an arc blow out as fitted to many high current relays. M.
  11. Minder

    3 Phase Motor - 3 Individual Circuit Breakers - Detect if 1 Breaker Tripped And Shut Down Motor

    Either way could work, I think I would go with the output side detection, You will need a small bridge and resistor for the opto's. M.
  12. Minder

    3 Phase Motor - 3 Individual Circuit Breakers - Detect if 1 Breaker Tripped And Shut Down Motor

    If you used rectifiers into opto IC's you could just OR the outputs, or totem pole style. M..
  13. Minder

    3 Phase Motor - 3 Individual Circuit Breakers - Detect if 1 Breaker Tripped And Shut Down Motor

    The 3ph NFB, (non-Fused Breaker) is often used, but as opposed to the OP's method, the NFB drops all three phases. These can also be obtained with remote trip action or trip detection contact. M.
  14. Minder

    3 Phase Motor - 3 Individual Circuit Breakers - Detect if 1 Breaker Tripped And Shut Down Motor

    Why not do it the usual way with 3ph contactors with O/L's attached, each O/L normally has a N.O. and a N.C, contact for sensing. The N.C. is typically used to drop the contactor coil, the N.O. is for a sensing/indicator circuit of some kind. When using a PLC, I used to use the N.O. as a...
  15. Minder

    seek help in drawing a schematic diagram from the Breadboard

    Here is a few symbols to indicate Power and Common etc. M.
  16. Minder

    single-phase motor speed control

    The only single phase induction motors that work with variable speed method is the type most used in fans, that is the both small shaded pole motor and the PSC, Permanent Start Cap motor, typically using Triac controllers. There is actually a VFD out there for larger single phase motors but they...
  17. Minder

    seek help in drawing a schematic diagram from the Breadboard

    If you want a schematic capture pgm in the future, Kicad is a very popular one with lots of tutorials and a forum. M.
  18. Minder

    More current to stepper motor

    You also require some means of ensuring the winding current is a constant 1.85amps at all speeds. M..
  19. Minder

    I need a relay HJR-3FF-S-Z 24v coil

    The usual reason for a sealed relay is if it is working in a harsh environment where contamination can occur, not really needed in this application. They all come sealed, mainly for the production de-fluxing stage, but those that can be opened, have the pip, but in many cases they are never...
  20. Minder

    Reverse Day/Night

    There are a multitude of 555 LDR circuits out there (Google), you would just need to juxtapose the pot or res with the LDR to get the reverse action. If an AC pump, use a relay on the output, if DC, a Mosfet. M.
View older results
Top