Hi, I'm trying to utilize the VIN (7-24V) connector on MKR 485 shield to power my Arduino from 24V DC supply. I'm trying first to power this VIN input from laboratory current limited power supply (so I don't burn the board) and it seems that 24V/0.5A it's not enough and it goes to current limit. Is this input usable or it's not working like that? It's the same on two MKR485 shields I have.
It would be great to use that instead of DC-DC converter, as 24V DC is already available in my app.
At what input voltage does this problem begin? Does it work on 7V, for example?
It appears you have several possible problems. Disconnect all hardware items from the board. If the problem is still there it sounds like the converter is saturated. Is the power supply polarity correct? If so then follow aarg 's comment and start with 7 volts and work your way up.
Hi, thanks for fast responses!
It is the same from 7V to 24V, it always hits the current limit.
Polarity is according to printing on the PCB, but I tried also reversed one with the same result (just in case the printing is wrong).
There is nothing connected to the board at all, even no MCU board (but I plan to use MKR WIFI 1010), just solely the RS485 shield board.
What value is the current limit set to, on the PSU? I recommend trying it while it is attached to a board - the designers may never have considered that anyone would try to power it without an MCU attached. Can you post images of your wiring and PSU?
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