Thread: not enough current for relays?
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11-08-2015 #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.
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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
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11-08-2015 #3
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11-08-2015 #4
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11-08-2015 #5
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11-08-2015 #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
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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
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11-08-2015 #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
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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?..Clive
The more you know, The better you know, How little you know
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