OpenSprinkler v2.3 DC burned components

[GCC]

Good morning, from one moment to the next, my OpenSprinkler v2.3 DC, which had been in continuous operation for many years, has encountered this problem, as shown in the photo, with some burned components. In the meantime, I have already ordered the new openSprinkler OS 3.4 AC-powered + Zone Expander – 3.x AC.

If possible, I would like to repair the v2.3 DC. Can I have some information on the two components and what could have caused the problem?

Thanks to anyone who can provide me with some information.

Attachments:

1. 

   OpenSprinkler-v2.3-DC.jpg
   

[Ray]

OpenSprinkler hardware design files are on Githug:
https://github.com/OpenSprinkler/OpenSprinkler-Hardware
for DC-powered controllers, the MOSFET for solenoid driver is AO3400.

[GCC]

Great thanks Ray. Could you tell me what might have caused this?

[Ray]

Hard to tell. MOSFETs are pretty robust and tolerant to faults as they can handle a very large amount of current, but they have limited voltage tolerance. AO3400 is rated for 30VDC. Some possible causes for damage include: applying out-of-range voltage (e.g. >30VDC); applying AC voltage of any level; damage due to voltage spike or lightening; a shorted solenoid or wiring that results in more than a few amps of current running through it. Since each zone has a SMBJ24A TVS diode, you can check that diode — if the diode is shorted, that strongly suggests a high voltage spike or lightening caused it.

[GCC]

Thanks again for the information.

[Author]

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