Why don't you just turn the battery charger off instead of wearing out the plugs on your shore power cord?
Tachometer Trouble On Shore Power?
- Thread starter jviss
- Start date
I honestly don't understand what you are saying. What is wearing out the pugs on the shore power cord, the current?
BTW, turning off the charger on a Freedom 10 would require that I turn the whole thing off, I think, and it's a pain to access in the cockpit locker. (The battery charger breaker on the AC panel does nothing.). Besides, who cares?
This is not good. It should be connected to a breaker on the AC panel.
I will have to look into it. There's a galvanic isolator and a Freedom 10 thing in the cockpit locker, and some kind of patch panel behind the breaker panel, and a Link 2000R inverter controller and dual battery monitor.
Ah, found the Freedom 10 manual. It is circuit-breaker protected:
I guess the battery charger breaker on the AC panel is for conventional shore power chargers.
This seems entirely plausible. I design power supplies for a living, and this sort of things happens often when you have two supplies sharing the same load.
Due to magnetic hysteresis, there may be some residual magnetic flux in the field that makes voltage even if the current is zero, but it might not be enough to trigger the tach and/or might also be "referenced" to V- or V+ or floating somewhere in between. If you had an oscilloscope you could look at the voltage going into your tach.
Nice unit and not surprised with VDO.
I was curious if any older boats had hall effect tachs from factory.. oem.
The limited budget of me and my cohorts means old boats are all I see.
While not exactly pocket change, they’re a lot more affordable than they used to be. For a basic scope, I’ve personally been impressed by the value and quality in the Rigol DS1000Z series that was pictured.
I've been wishing to have the $'s to buy a fluke 120B handheld oscilloscope... Talk about perfect for having on a boat... At least seems to me... I don't know anything about the Rigol you mention but I do see it runs on house current. The Fluke runs on batteries. Makes for a nice portable unit...
www.fluke.com
But chump change it is not...
dj
Fluke 120B Series Handheld Digital Oscilloscope
The Fluke 120B Series is a handheld digital oscilloscope for industrial electrical & electro-mechanical equipment troubleshooting & maintenance.
www.fluke.com
But chump change it is not...
dj
Ha, ha, I have an old-school "portable" 'scope, a Tektronix 2465B, 450Mhz CRT scope, no storage. It was my favorite when I was doing circuits work decades ago, so I picked one up on eBay maybe 15 years ago for short change. A modern, digital storage 'scope would be nice, though! My probes cost more than those 'scopes!it is made by fluke.
For simple diagnostic work some Chinese ones work well. A tech I know has a 3 channel unit for automotive diag.
For portability there are also options now that have Bluetooth probes that connect to an iPhone app to do the data storage and display. https://www.pokitinnovations.com/pokit-pro/ is one such option, but I think there are others. They might not have the sampling rate and sensitivity of professional bench equipment but the price isn’t bad and maybe it’s good enough for on-the-go usage.
That is exactly the case. I did the same thing today right after launch without thinking about it. In the past I have had this same issue if I run the aux and the generator with the charger energized. Today it was shore power to the charger with the aux running. Same situation, same result.
If the alternator controller (either internal or external) sees a high battery voltage, it shuts down the alternator. No field current means no output and no pulses to the tach.