How To Replace and Improve the Sea Ray Systems Monitor

ttmott

PhD in OCD
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TECHNICAL Contributor
Apr 3, 2012
8,019
Space Coast Florida
Boat Info
2006 52 Sedan Bridge
Engines
Cummins QSM11
The display on the SR Systems Monitor had died long ago so I did quite a bit of research then retrofitted the hardware and greatly improved the entire system; All for about the price of the SR display alone. The basic pieces are 1 Maretron DSM410 display module, 1 Maretron RIM100 run indicator module, 1 NEMA 2000 backbone and drop cables, 1 Blue Sea fuse block, and some wire. This is the end result, the wire diagrams, and installation photos. The Maretron DSM410 is an impressive piece of hardware and it's capabilities are far beyond the original Systems Monitor; some of the additional features I've incorporated (the data was already on the NMEA 2000 network) include trim tab position, rudder position, navigational data, engine data, depth transducer data, and much more. But, this post is about the capability for the systems monitor features I set up....
Now, for the systems monitor, I limited the monitoring channels to six as that was the total available with one Maretron RIM100; more RIM100 modules can be added but for my purpose six channels were adequate. With that said to reduce from the nine Sea Ray monitored elements to six channels I combined the three bilge sump pumps to one input using shottky diodes to prevent one pump's "on" signal powering up another pump (see the attached schematic) and eliminated the shower sump as a monitored signal.
So, should one of the monitored systems become "active" (like the generator shutting down unintentionally) the Maretron DSM410 display line item turns red, an audible alarm sounds, and an alert indicator comes on in any of the display's screens. A press of the power button acknowledges the alarm and silences the horn. As an additional important feature an integrated counter and timer records how many times and how long an alarm occurs; this is important should the bilge pumps cycle on and off to keep a water leak at bay this data is available and a component of the alarm. A much improved and superior systems monitor.... Recommend.
The first, second, and third images show the monitor in normal (no faults) mode, one of the three bilge pumps running, and how an alert appears in another screen.
The fourth image is the installation where the original SR monitor system was installed and the installation of the new components in the lazarette.
The fifth image is the NMEA 2000 network under the helm.
And, the sixth and seventh are the wiring diag's.
Maretron Display 3.jpg

Maretron Display 2.jpg
Maretron Display 1.jpg

Maretron RIM100 Installed.jpg
View attachment 64912
NMEA 2000 under helm.jpg

52DB Data Network Systems Monitor page 1.jpg

52DB Data Network Systems Monitor page 2.jpg


 
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Sweet. So did you use something like a 20v or 30v diode? Just for margin? And why 3a diodes and 5a fuses? Do those lines carry that much current? Not challenging you, just trying to save myself from pouring over the specs. Lol.
 
Sweet. So did you use something like a 20v or 30v diode? Just for margin? And why 3a diodes and 5a fuses? Do those lines carry that much current? Not challenging you, just trying to save myself from pouring over the specs. Lol.
Sorry that's an error - they are 15A 45V diodes. I'll correct the post....
 
first let me say this is a very elegant solution. Two issues.. 1) the symbol for the diode is a Zener diode. not a big deal.
2) since the data sheet says you can connect the inputs to either + or -, that would lead you to believe the input circuit is a comparator. Thus just a small amount of current would flow into the input. The use of 15A fuses would be way overkill and could cause something to burn up if there is a short on the sensor. Suggest reducing the fuse current.
 
first let me say this is a very elegant solution. Two issues.. 1) the symbol for the diode is a Zener diode. not a big deal.
2) since the data sheet says you can connect the inputs to either + or -, that would lead you to believe the input circuit is a comparator. Thus just a small amount of current would flow into the input. The use of 15A fuses would be way overkill and could cause something to burn up if there is a short on the sensor. Suggest reducing the fuse current.
I'll try to fix the image on the diodes but limited on the graphics. The fuses are 5A which are per the Maretron literature.
 
Sorry that's an error - they are 15A 45V diodes. I'll correct the post....

15A diodes? Is that a Maretron spec too? Or is that what Sea Ray had in the monitor? Or is it because these are connected to bulge pump power lines? I can envision some serious current spikes when those pumps kick on, so this would make sense.
 
15A diodes? Is that a Maretron spec too? Or is that what Sea Ray had in the monitor? Or is it because these are connected to bulge pump power lines? I can envision some serious current spikes when those pumps kick on, so this would make sense.
The purpose of the diodes are to prevent voltage/current "back feed" to the other bilge pumps tied to a single monitor circuit should one come on and would, without the diodes, consequently power up the other pumps; this condition would probably trip the active pump circuit breaker however in reality the 16ga wire would probably limit the current. In discussions with Maretron the RIM100 is insensitive to current/voltage transients however must be protected with 5A fuses.
 
What's the total cost?
Hardware specific to the Systems Monitor replacement is around $1200
I did all of the installation myself but to include the entire NMEA backbone, cleaning out old/abandoned wire, and Fusion audio system probably 80 hours.
This is the pile of wire and hardware extracted just from the bridge during the installation:
 
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A bit of discovery for those with Cummins QSM11's and maybe others regarding the Sea Ray Systems Monitor.
Two of the wires (green) connected to the systems monitor module are shown in the owners manual as for port and starboard exhaust temperature. In verifying the functional operation of each input, I could not get the exhaust over temperature to respond on those wires. When putting a shorting clip over the temperature switch on the exhaust pipe the appropriate fault appeared in the Vessel View 7 (it is shown as a raw water flow fault) however, nothing on the systems monitor wiring. So, I opened up the engine harness and behold, found those green wires neatly clipped and taped away; not used; nada.. In reviewing the Cummins engine wiring schematics it ends up there is no user interface for the exhaust over-temp switch; it's a dedicated input to the engine's ECM. I'm hesitant to mess with any of the Cummins engine harness wiring so I guess there are now two additional inputs to the Maretron RIM100 which I'll probably now revise to add.... Doing things twice is painful, especially where this is installed..... Revised wiring diag below -
52DB Data Network Systems Monitor RevA.jpg
 
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This seems like a great upgrade to the stock system. Nice work.
 
TTmott I’d like to get rid of my systems monitor and replace it with your set up but it may be a bit above my pay scale once I heard “diode”. I’m pretty good with 12vdc and 110vac but not electronics . I’d need you to make this system plug and play:D
I did remove all nmea0183 wiring from the helm and had the same bundle you did.
 
TTmott I’d like to get rid of my systems monitor and replace it with your set up but it may be a bit above my pay scale once I heard “diode”. I’m pretty good with 12vdc and 110vac but not electronics . I’d need you to make this system plug and play:D
I did remove all nmea0183 wiring from the helm and had the same bundle you did.
Diodes are gone due to the elimination of the exhaust over temperature sensors and now enough channels for all of the bilge pumps - it is plug and play...
The Maretron DSM410 manual is 275 pages focus on section 7 for the programming.
 
Really appreciate you posting the plans, I was thinking of a similar Marathon setup for my 410EC, since the DDU died. I’ve already replaced it once and don’t feel like shelling out that kind of money again for such a failure prone product! Where was the interface module in your ‘52? I haven’t pulled the panel next to the engine room breakers yet or the switch panel in the salon.
 
Really appreciate you posting the plans, I was thinking of a similar Marathon setup for my 410EC, since the DDU died. I’ve already replaced it once and don’t feel like shelling out that kind of money again for such a failure prone product! Where was the interface module in your ‘52? I haven’t pulled the panel next to the engine room breakers yet or the switch panel in the salon.
In the starboard side of the lazarette on the engine room bulkhead outboard of the DC main breaker panel is where the SR Systems Monitor module was on the 52DB.
 
ttmott - Very nice. Almost looks like some of my screen shots. I love the Maretron devices they do a really nice job with there products. I only wish they made a sun cover for the DSM410.

Question, what are you using for the audiable alarm?

As stated the nice thing about using NMEA2000 is that you can add so many other things and have much more then jsut a system monitor. Good Luck and Great Job!
 
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Question, what are you using for the audiable alarm?
Only what is with the DSM410 but that is not loud enough to hear while underway. I'll probably add the Maretron ALM100 alarm module later.
 
Nice work and thanks for the detailed documentation.
 
Only what is with the DSM410 but that is not loud enough to hear while underway. I'll probably add the Maretron ALM100 alarm module later.

Thats what I think I will be doing as well. It's a shame they didn't add the ability to have an external non-NMEA2000 device trigger the alarm as well. That would be very useful, especially for what they are charging for a sounder ...
 
Thats what I think I will be doing as well. It's a shame they didn't add the ability to have an external non-NMEA2000 device trigger the alarm as well. That would be very useful, especially for what they are charging for a sounder ...
Maretron does - it is their SIM100 module.
 

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