Page 1 of 2 12 LastLast
  1. #1
    Hi,
    how do i deal when a board / Pokeys57CNC does not output enough current on output 5v pins to switch a external relay / 8 channel relay board 5vdc /??

    Leds light but not bright enough and no switching happens.

    Do i buy their relay board which has other type of communication with the BOB or there is sth i can do to make the general Chinese relay board work

    their board is 30eur versus 10 euro for general low high chinese relay board. and i need 2 .
    Last edited by Boyan Silyavski; 11-08-2015 at 09:10 AM.
    project 1 , 2, Dust Shoe ...

  2. #2
    Boyan You don't say how you are powering the Pokeys board.
    This is from the manual:-

    [PoKeys57CNC requires external 6-26V power supply to be connected to the board in order for the device to operate correctly (device may not operate according to the specifications if the external power supply is not present). The device uses switching power converter to scale down the input power supply to 5V. The power supply should be capable of providing at least 2.5W.]
    Last edited by Clive S; 11-08-2015 at 09:37 AM.
    ..Clive
    The more you know, The better you know, How little you know

  3. #3
    24vdc 150W, but it seems its irrelevant for the outputs


    seems it was never meant to do that, look bellow at specs from pdf. I wonder why sb will do such nice board, but that could not power an input of a bloody relay


    Attached Thumbnails Attached Thumbnails Click image for larger version. 

Name:	relay.PNG 
Views:	283 
Size:	34.4 KB 
ID:	15872  
    project 1 , 2, Dust Shoe ...

  4. #4
    so what you say Clive, i buy their relay board? and forget about the case
    project 1 , 2, Dust Shoe ...

  5. #5
    ok, i sorted it out.

    it seems they have another product PoExtBusOC16 , which - incorporates 16 high current/voltage open collector outputs which suits applications such as lamps, relays.


    project 1 , 2, Dust Shoe ...

  6. #6
    Quote Originally Posted by Boyan Silyavski View Post
    24vdc 150W, but it seems its irrelevant for the outputs


    seems it was never meant to do that, look bellow at specs from pdf. I wonder why sb will do such nice board, but that could not power an input of a bloody relay


    I read that Boyan but it seem to indicate you can take out the 100R and then get 50mA what do you think. ..Clive
    ..Clive
    The more you know, The better you know, How little you know

  7. #7
    i read somewhere that the relays need more than that, ~80-100mA so at the end i bought the extra boards.

    i wish sb simplified the stuff and said- " you need that board and that relay board or output board, cause otherwise you will not be able to do this and that " cause for me 50mA is like chinese.

    how difficult would be to do that if you sell a product
    project 1 , 2, Dust Shoe ...

  8. #8
    Quote Originally Posted by Boyan Silyavski View Post
    i read somewhere that the relays need more than that, ~80-100mA so at the end i bought the extra boards.

    i wish sb simplified the stuff and said- " you need that board and that relay board or output board, cause otherwise you will not be able to do this and that " cause for me 50mA is like chinese.

    how difficult would be to do that if you sell a product
    I think a lot of small relays will switch at about 15mA https://www.sparkfun.com/products/100 or even less
    ..Clive
    The more you know, The better you know, How little you know

  9. #9
    Did not think of switching them directly.

    Now i read that the relays i was going to use are triggered only by 5mA, so why would they not work?

    By the way it looks a really quality stuff. and has LOW HIGH jumperson each pin. I have used it before with great success


    Module Description :
    1, the module uses genuine quality relay , normally open interfaces Maximum load : AC 250V/10A, DC 30V/10A;
    2, using SMD optocoupler isolation , driving ability , stable performance ; trigger current 5mA;
    3, the module voltage : 5V
    4 , each way module can be set high or low triggered by jumper ;
    5 , fault-tolerant design , even if the control line is broken , the relay will not operate ;
    6 , the power indicator ( green ) , 8 relay status indicator ( red )
    7 , interface design humane, all interfaces can be connected directly via terminal wiring leads , very convenient
    8 , Module size : 141.5mm * 50mm * 18.5mm ( L * W * H )
    9 , has four mounting bolts holes , hole 3.1mm, pitch 136mm * 44.5mm




    Attached Thumbnails Attached Thumbnails Click image for larger version. 

Name:	$_12.JPG 
Views:	234 
Size:	47.2 KB 
ID:	15873  
    project 1 , 2, Dust Shoe ...

  10. #10
    Did not think of switching them directly.

    Now i read that the relays i was going to use are triggered only by 5mA, so why would they not work?
    You would have to show how you are connecting them . It could be a problem in the way you are grounding them.
    ..Clive
    The more you know, The better you know, How little you know

Page 1 of 2 12 LastLast

Similar Threads

  1. CSMIO-IP/S Driving Relays directly
    By cropwell in forum CS-Lab (CSMIO)
    Replies: 10
    Last Post: 02-01-2017, 01:40 AM
  2. Using current as cutting force indicator?
    By mitchejc in forum General Electronics
    Replies: 10
    Last Post: 13-01-2015, 05:09 AM
  3. question about relays
    By frankman in forum General Electronics
    Replies: 3
    Last Post: 23-01-2012, 07:47 AM
  4. Current Set Resistors.
    By NzOldun in forum Motor Drivers & Controllers
    Replies: 1
    Last Post: 20-06-2011, 08:38 AM
  5. G540 Current set resistors
    By blueseidboy in forum Motor Drivers & Controllers
    Replies: 3
    Last Post: 23-08-2010, 02:21 PM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •