[PSUBS-MAILIST] wiring problem

[Sean T. Stevenson via Personal_Submersibles]

Just to confirm - when you say "compressor ground", you are referring to the chassis / safety earth (which should be connected to the hull) and not the power supply negative (which should not be)?

Sean



On June 9, 2016 6:18:35 AM MDT, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>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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