Hi! I was given this board. Its supposed to be a heating controller. It can be programmed over othernet from a computer, and can manage different outputs via a "BUS" connector (there's suppossedly an external module where this BUS wires enter with some relay outputs that power on/off heating valves for different rooms
The owner stated something like "I reversed the polarity and although the manual states that's its made to withstand reverse polarity, and would wanr the used onscreen, it ended up broken and would say "shortcut in output" all the time, or something like this
He said that he sent it to the manufacturer and they said they changed "maybe a capacitor" and sent it back. Only component I can see that looks like it might have been replaced is the bus mosfet (FQP 17N40), but he tested the unit at arrival and it would still not work.
When I plug it into +18V it seems to work fine but he says that it shows the error when he plugs the "BUS" wires. Again he confirmed that the BUS wires are not shorted as he has another unit now working on them
He has a bunch of these controller and he tried to swap different BUS outputs to this unit and this same BUS to another unit and it was clear that this unit was the faulty one, there was no shortuc in the BUS connection.
I've disassembled it and not knowing that protocol that "BUS" is, all I could check is that there are +18v constant at the BUS, the 3.3v regulator has 5.0v at input and 3.3v at output, and that's basically it...not sure what else I could test not undesrstanding the BUS protocol.
Has anyone worked with these systems?
Thanks!
The owner stated something like "I reversed the polarity and although the manual states that's its made to withstand reverse polarity, and would wanr the used onscreen, it ended up broken and would say "shortcut in output" all the time, or something like this
He said that he sent it to the manufacturer and they said they changed "maybe a capacitor" and sent it back. Only component I can see that looks like it might have been replaced is the bus mosfet (FQP 17N40), but he tested the unit at arrival and it would still not work.
When I plug it into +18V it seems to work fine but he says that it shows the error when he plugs the "BUS" wires. Again he confirmed that the BUS wires are not shorted as he has another unit now working on them
He has a bunch of these controller and he tried to swap different BUS outputs to this unit and this same BUS to another unit and it was clear that this unit was the faulty one, there was no shortuc in the BUS connection.
I've disassembled it and not knowing that protocol that "BUS" is, all I could check is that there are +18v constant at the BUS, the 3.3v regulator has 5.0v at input and 3.3v at output, and that's basically it...not sure what else I could test not undesrstanding the BUS protocol.
Has anyone worked with these systems?
Thanks!
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