Bisho Posted January 6, 2013 Report Posted January 6, 2013 Hi, I am new to the forum and am a 252 owner from Australia. I have had my plane for about three years now and only recently I have began to have and indication on my JPI that I am getting up to 29.8 volts. This intermittent indication is relatively short lived lasting between a couple of seconds up to a minute during an hour flight i might see this 6 times. The problem can be resolved immediately if I recycle the alternators (generally alt 2). I know this is not the JPI being mischievous as the ship meter is indicating the same although not at the point where I am getting an over voltage indication on the annunciatior panel. My question is has anyone experienced this problem before? I am hoping this isn't the voltage regulator.
AndyFromCB Posted January 7, 2013 Report Posted January 7, 2013 Two possibilities: -your voltage regulator going haywire (unlikely) -or like my case, the voltage sense wire going to the regulator is breaking or the connection is intermittent, causing the voltage regulator to sense a voltage drop and increase the field voltage going to the alternator. That was my problem, #2. 1
M252 Posted July 21, 2013 Report Posted July 21, 2013 Hi, I seem to be having the same problem in my 252. Do you have an illustration or photo that shows the sense wire and its location? I would like to check if I can locate the problem before flying home from a fairly remote location... In my case the Alternator Field 1 CB popped out in a climb. Potentially due to an intermittendly high voltage ( on the ground I measured 28.6 Volts at 2000 RPM). Thanks fo your help!
Bisho Posted July 22, 2013 Author Report Posted July 22, 2013 Hi M252, My issue ended up being just an old joint in the voltage regulator that was causing the intermitent voltage spike. with regard to your problem I am not sure i could advise you. at 2000RPM 28.6 is OK, did you get a high voltage indication on the annunciator panel during your climb? Sorry I cant help you.
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