[PSUBS-MAILIST] wiring problem

[hank pronk via Personal_Submersibles]

Hi AlanYes that is how it is wired.
Hi Sean,The radio works perfect, well I assume, I should say it turns on fine as long as the compressor ground is disconnected.  When I turn the radio on with the compressor ground connected the radio breaker trips.  The breakers in Gamma are an aviation  style breaker, they look like what you have in you house breaker panel. If I remove the radio from the hull, I can turn it on just fine with the compressor ground connected.   I am wondering if my radio is shorting out so there is pos current in the cabinet and the compressor is providing a ground for it to short out.I will instal the transducer and do some more testing, I can put the surface radio transducer on top of the sub transducer and test to be sure the radio is actually working still.  Hmm now I am wondering if I have the power reversed on the compressor and I am turning the sub into a positive ground, the compressor should still work with polarity reversed.  Thanks' guys.Hank 

    On Wednesday, June 8, 2016 8:26 PM, Sean T. Stevenson via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
 

 Hank, do a continuity check between battery negative and the hull / chassis / safety ground. There should be no continuity from either battery terminal.  If there is, the DC power supply common is tied down to chassis at one of the devices.  Check the radio antenna as a possible culprit.Next, check the potential of each power supply connection, not only between + and - at the device, but with respect to each other as well. (You mention tapping 24 V off a 36 V battery - any chance you're between +24 and "0" on one device and +36 and +12 on the other?)What is the breaker type?When you say it doesn't work with a ground wire connected - you are referring to a hull connection?Sean


On June 8, 2016 4:12:21 PM MDT, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
Today I was doing some final wiring and discovered if my hp compressor has the ground wire on it,  my acoustic radio  trips the breaker.  What the bleep is going on?  Nothing is grounded to the hull anymore.    I am taking 24V off a 36V bank for the compressor and the Radio is also taking 24V from the same source.  Hank
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