HFS-3 Controller Blowing Fuse - Fixed
Fixed this before Richard could get back to me, but I'm posting this incase anyone else has this issue in the future.
Upon installing my HFS-3, it blows the 5A wire protection fuse every time I went through the Power Up Procedure as outlined in the manual. Tested all of the wiring and there were no shorts. I probed the HFS-3 controller board to try and locate the fault: There was a dead short between 12V+ and "power" ground. This short cleared if you remove the onboard fuse. Tracing the board with a meeter, I discovered the only things connected to "power" ground are the FAV and Pump control mosfets, board power relay, and a diode with the marking "S1J". This cross references to a Vishay rectifier diode with a 1A continuous 40A burst current rating, and it appears to protect the rest of the board from a reverse polarity and power relay coil flyback. https://i.imgur.com/53fwk2c.jpg This diode was the only thing that was across both 12V+ and “power” ground, so I unsoldered it to see if that was the issue. https://i.imgur.com/bqJVX6O.jpg No more short! The only DO-214AC diode Could get on short notice was a Farchild ES1G, one tier down in specs but probably close enough. https://i.imgur.com/USRPxjW.jpg Plugged it in and followed the Power Up Procedure once again, and everything works! https://i.imgur.com/wabKmxk.gif This was LIKLEY caused by polarity being reversed at some point while installing it :o. |
Re: HFS-3 Controller Blowing Fuse - Fixed
good work!
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