Re: [Amel Yacht Owners] Re: SM Mast Wiring, Instruments and NMEA

Bill & Judy Rouse <yahoogroups@...>

I believe #19 was wired to 24VDC when BeBe #387 was built because one of the functions of the FFD is battery voltage and I assume that is the reason for this connection.

Regarding your problem. Tinley Electronics in Britain also does B&G Hydra repair and usually has inventory of used older B&G parts. Email sarah"at" Tel: +44 (0)1590 610071

Also, when you get that processor back you may have to go through the installation process described below:

Something triggered a system reset on our B&G instruments in 2008...Boat Speed and the Wind Speed analog instruments appeared reversed.  We were at anchor with about 10 knots of wind.  The needle on the Boat Speed was at a 9:30 position and the Wind Speed was registering zero.  I realized that a position of 9:30 on the Wind Speed would be about 10 knots.


I found that section 5.3.2 of the Hydra 2000 User Manual details how to “Configure the Analog Indicators.”  This procedure allows you to specify which values are sent to each analog instrument.  I went through the steps in the User’s Manual and configured the Wind and Boat Speed correctly.  If your Amel is like my Amel, the default settings will reverse Boat Speed and Wind Speed and you will have to “Configure the Analog Indicators.” 

I copied and saved this posting by Gary Silver almost 9 years ago regarding connecting to the NMEA out on the B&G FFD:

A couple of warnings are in order. 

1.  Radio frequency interference (RFI) evidently can cause
the NMEA interface to glitch so careful routing of
properly shielded and grounded wire is important. 

2. Use twisted pair shielded high quality wire, avoid running it
right next to the SSB or VHF antenna cables or other
high current 24 vdc power wires, and ground the shield
at only one end of the wire run (I grounded mine at
the Hydra 2000 NMEA display cable). 

First the connections at the Raytheon autopilot computer. You are going to be feeding the NMEA heading information to the B
& G so that the Hydra 2000 can calculate true wind.
You use the "NMEA output" from the Raytheon computer
(this is located in the cupboard above the sink,
between the 220 VAC and 24 VDC circuit breaker panels and
is mounted on the forward side of the cockpit
bulkhead on which the helm wheel is mounted). 

The cover is removed by depressing two tabs on either side of the
cover and sliding it downward. The wires should be
tinned, the shield trimmed off and covered with heat
shrink within about two inches of the terminal strip and
they are inserted by pushing down on the tab and
sliding the wire into the terminal hole. Just look at the
other wires to get the direction of the hole. 

Route the wire towards the port side, then via the access tubes
into the access area behind the analog B & G
instruments via the sliding ceiling access panel in the
kitchen. Use one of the un-used conduits to thread the
wire into the starboard quarter-berth area. 

Then by removing a small piece of trim in the bookshelf area above
the nav station hanging locker you can route the wire
into the nav station area. Leave enough slack to allow
the rack system to be removed easily. 

Attached is the info from the B & G technical support: DO NOT ATTEMPT
TO USE THE NMEA INPUT OUTPUT terminals on the Hydra
processor (i.e. the B & G computer) Instead the NMEA
connections must be made through a NMEA FFD on HYDRA

B & G tech support states: The solution will be to
locate your NMEA FFD, and connect the wires from your
Raytheon as follows: 

Raytheon NMEA Output (+) Brown 
NMEA Output (-) Blue 
NMEA FFD NMEA Input (+) Violet 
NMEA Input (-) Black 

The wire shield is grounded by connecting to the other
grounds at the hydra processor. The above wires
are from the cable coming from the Hydra 2000
display. You will find that they are capped. Just pigtail
them together as indicated. 

Lastly, I will upload some B&G troubleshooting guides in a few minutes...look for the automated message.

BeBe 387

On Thu, Oct 1, 2015 at 2:20 PM, peacock@... [amelyachtowners] <amelyachtowners@...> wrote:

Thanks to Joel and all for your help.

It sounds like it may not be too difficult. More background: I was trying to hook NMEA from B&G to my new chart plotter, and must have done something wrong. The circuit board on the processor is shot, and probably the digital display as well. Not sure about the sensors and gauges. Not sure how it happened, but a post-mortem revealed that even though the system is 12 V, there is also a 24 V wire coming into the processor on terminal #19. This is referred to as a "Battery Sensing" terminal, I would assume if voltage goes low, and if your system were rigged correctly, a B&G alarm would go off. Not even sure if it works for 24 V. I don't know if it came wired this way from LaRochelle, or if it was hooked up under the previous owner's watch. 
There is a B&G vintage instrument outfit in Fort Lauderdale that I have sent the processor and digital display to, but even if fixable, I'm still not sure about the sensors and gauges.
Thanks again.

Join { to automatically receive all group messages.