[Edited Message Follows]

Thank you Bill for your feedback!

I have ordered new brake pads from Maud. I also sent the video and waiting for a feedback.

I wanted to remove the whole brake but I have NO experience with hydraulics. Do I need a specialist for the hydraulic line to remove and remount? My fear is, if I decouple the hydraulic line from the braker I will lose hydraulic oil and air will get into the system. Also the two screws, that hold the brake on the bar look pretty hard to access.

So until now I could not evaluate the reason for the shaking. It is hard to find a marine mechanic in Italy with hydraulic disk brake know how....something very special.

Ralph

The following files have been uploaded to the Files area of the main@AmelYachtOwners.groups.io group.

• /disk brake A54 slipping shaky.mov

By: ralph.heilig

Description:
A54 #144 disk brake is shaky, slipping in 6 kts +,

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Oliver, are you going to market and produce the custom board you show in your video? If you can help me better understand what you are saying, I am assuming the following:

1. You developed and have built a board that integrates the functions of the VESC with a VESC interface signal controller and now the N2K interface for the temperature sensors - an all-in-one board that will drive the BLDC motor directly via 3 temperature inputs that can be read on our standard NMEA 2000 bus?
2. You will provide that to us Amelians if we want to order one from you, and if so, are you ready to sell the board you created and provide us wiring diagrams, etc.?

Are you still developing it? I can make what I am doing work, but certainly an all-in-one board would be far better than having a bunch of connected parts. I really want to keep it simple, but having the ability to read the temperatures over my N2K bus would really be a big plus. Doing so would allow us to be sure the pump is running and the refrigerators are not failing from a loss of coolant flow. I have digital readouts that give me visual temperature displays, but they are local only.
Thanks,

Jamie
Phantom A54 #44

Oliver, are you going to market and produce the custom board you show in your video? If you can help me better understand what you are saying, I am assuming the following:

1. You developed and have built a board that integrates the functions of the VESC with a VESC interface signal controller and now the N2K interface for the temperature sensors - an all-in-one board that will drive the BLDC motor directly via 3 temperature inputs that can be read on our standard NMEA 2000 bus?
2. You will provide that to us Amelians if we want to order one from you, and if so, are you ready to sell the board you created and provide us wiring diagrams, etc.?

Are you still developing it? I can make what I am doing work, but certainly an all-in-one board would be far better than having a bunch of connected parts. I really want to keep it simple, but having the ability to read the temperatures over my N2K bus would really be a big plus. Doing so would allow us to be sure the pump is running and the refrigerators are not failing from a loss of coolant flow. I have digital readouts that give me visual temperature displays, but they are local only.
Thanks,

Jamie
Phantom A54 #44

Agree about the motor back-fire possibility. I will be using a MOSFET to prevent that, and carry a few spare systems - they are cheap to build. Plus, as you no doubt understand, systems will develop and improve over time as we think of new features and control schemes. Presumably, you installed temp sensors in your refrigerator boxes and used the original Amel wiring from the compressors to the E51385, thereby bypassing that box entirely. That certainly would be the best approach, but I have not yet gotten there.

What is the ARDUM xxxx board? Don't forget, my system is still in the prototype phase. I looked on your website and could not find anything new, other than the running motor video.

Thanks,

Jamie

Phantom A54 #44

By now most are familiar with the problems many of us have experienced with the Flojet/Frigoboat refrigeration water circulation pumps. Several of us who have Amel 54's have noted the very short life of the motors for these pumps when we are in very warm climates. There have been 2 long and potentially confusing threads on this complicated issue, so I decided to create a new one devoted to my solution…………..

The original goal was hopefully a new type of pump driven by a brushless DC motor. Unfortunately, finding a pump with a brushless motor that will work in the Amel service has proven quite elusive, as there are pluses and minuses with every type of pump available. While there are brushless motor-driven pumps out there, they are generally unsuitable, as they are centrifugal and hence need a constant prime. Additionally, some who have tested other types of pumps (gear driven for example) have reported that they are very loud and do not circulate the correct amount of cooling water. Then there is the issue of power requirements. We want a low-current solution.

As a new approach, a few of us have been pursuing a custom brushless motor design coupled to the normal Flojet pump. The Flojet pump is really a good design, as it is quiet and self-priming. Well, I have finally developed a working brushless motor using some of the hardware recommended by Oliver on Vela Nautica. He successfully implemented a brushless motor connected to the Flojet pump through an electronic speed controller, but the missing ingredient has always been the interface to the refrigeration compressors/pump interface.

I now have a prototype functioning system that includes the following components: Flipsky Brushless Motor, Flipsky VESC (controller), and the key component - a mini programmable control board called Arduino. I have not yet built the brackets needed to hold the motor, nor have I yet put all the parts into a small box to install in the engine room. I had to make sure the setup would work first, and I have just now confirmed that.

The motor will be attached to the pump body (cannibalized from the Flojet), eliminating the problematic brushed motor on the pump. Then you will connect the VESC to the motor and program it (using a PC/MAC) with included software (very simple to do through an automated setup and USB connection). And finally, you will connect the Arduino to the VESC and the Frigoboat pump interface (E51385). You have to program the Arduino as well, but again it is quite basic to do so through Arduino software (provided with the controller board). I also use a simple 10K-ohm potentiometer to control the motor speed in real time.
Here is the way my setup is going to work - sorry to have to be so technical, but figuring all this out has been an engineering challenge, and I do not want to overly confuse anyone.

The Frigoboat E51385 sends out a voltage signal (yes it is ultimately 12 volts) to the Arduino (can be direct through a 12V-5V voltage converter, an electronic 12V relay that connects to the Arduino through a NO dry contact, or via temperature sensors inside the refrigeration units). At the moment I am using the relay approach but may shift to temperature-sensor control, as that would allow the Arduino to change the motor speed in response to the fridge temperature(s), which I believe is what Oliver does. The Arduino senses the voltage, contact closing, or temperatures and then turns on the VESC, which then drives the motor at the speed selected by the potentiometer. You would not need the potentiometer if you use the temperature sensors, but that also means reconfiguring the wiring from the refrigeration units and installing sensors in the fridge boxes.
IT WORKS, and the power demand is quite low. Plus, the sky is the limit (with the Arduino), and anything you can dream up is possible with a few extra wires, sensors, and some basic programming. As noted, I still have to install all the components in a box, connect the motor to the Flojet pump body (need to fabricate a bracket of some sort), and mount everything in the engine room. All that is work for sure but not at all technical. Unfortunately, the motor I bought is not the right size to mate with the pump body, and I need to order the right one - yuk.
Once I get everything installed and finalized in my engine room, I will provide a parts list and a schematic for everyone to follow if they would like to make one of these. I will also provide photos so that all this stuff becomes clear.
Stay tuned. I hope to have the final setup within the next couple of weeks or so. If anyone wants to dive in now and get the parts, let me know. I can provide a list of components and better instructions.
Thanks,
Jamie
Phantom, A54 #44