Emerson/Vertiv R48-series CAN programming?

[Yodany]

The commands I have used

Voltaj 54V​	03 F0 00 24 42 57 00 00​
Curent 90%​	03 F0 00 19 3F 66 66 66​
Curent 95%​	03 F0 00 19 3F 73 33 33​
Walk in on (activare)​	03 F0 00 32 00 01 00 00​
Walk in off (dezactivare)​	03 F0 00 32 00 00 00 00​
Walk in time 10 sec​	03 F0 00 29 44 7A 00 00​
Fan speed auto​	03 F0 00 33 00 00 00 00​

 

[rwyu90]

The commands I have used

Voltaj 54V​	03 F0 00 24 42 57 00 00​
Curent 90%​	03 F0 00 19 3F 66 66 66​
Curent 95%​	03 F0 00 19 3F 73 33 33​
Walk in on (activare)​	03 F0 00 32 00 01 00 00​
Walk in off (dezactivare)​	03 F0 00 32 00 00 00 00​
Walk in time 10 sec​	03 F0 00 29 44 7A 00 00​
Fan speed auto​	03 F0 00 33 00 00 00 00​

Thank you, I will try again manually without the Bluetooth serial app. hope it works.

 

[rwyu90]

found another problem with the psu, the voltage could not be set above 48v, when I tried to set it to 49v - 58v the psu instead changed to 43.5v. i tried it on r48-2000e3 and r48-1000, online and offline commands. both same respond

found the solution, the problem was in the bluetooth serial app, it considered the command "10"(53.5V) as "1"(43V). the solution simplifies the commands to just 9 commands. now the psu can be set up to 58V. thanks all.

 

[rwyu90]

I just bought 2 r48-3000e3 and plan to set the each voltage 42V 20A, connected in series to make 84V 20A charger for my Polytron Fox R. Did You had set the current limit trough CAN BUS?

Hai om, Is your setup working well? can you share a report of the results?

 

[trogalko]

Hai om, Is your setup working well? can you share a report of the results?

Not yet Om. just got the last piece of the puzzle, a step down converter from 84V to 12V to power Voltmeter+100A Amperemeter (as I want to measure the output V and I directly, and worry about which ground point should I take, so I plant to power the Voltmeter/Amperemeter directly from 84V output via buck converter). I also went further trying to make a simple web based ESP32 configurator to adjust the voltage and current of r48-3000e3. Looks like I must use dpdt relay if I want to control two psu(s) using single ESP32 and can bus controller as I can not using same ground.

 

[trogalko]

Yes om... i set current limit both PSU to 1,20%.

And this my sketch on arduino for your reference. Using mcp2515 and esp32.

Trying using your esp32 code here to set to 42V, works like charm. But when I turn off the esp32, in about 40 seconds, the r48-3000e3 revert back to 51.8V (no load, just test using voltmeter). The set voltage offline should set the default voltage permanently right? So I can't use relay because I must keep it switching on/off every 30 - 38 second or less to control 2 psu(s) from single mcp2515. Or it is safe to control 2 psu(s) using single (paralel canbus) mcp2515?

 

[dominik h]

There must be something wrong in the Code or the voltage values , if they are not set permanently the revert back to 53V.
I'm not shure if they can be hooked together to one can if the output is connectted in series. The Huawei and the Megmeet work in parallel and in series on one can bus.
I'm shure the Vertiv and the Eltek will work in parallel on one can bus as the original system controller has only one can output. In series I have not tried it.
Someone has tried three in series. Look on Page 1 #22

 

[trogalko]

I keep the relays in the end. When its dead, mayble I'll switch to ssr. About the set offline voltage failure, my best guest is the eeprom in the psu that used to store the offline value already wear out, so its unable to save the new default voltage permanently.

 

[dominik h]

I would just try to send only one offline message to one psu wuth an USB-CAN converter and see what happens.
I have programmed about 150 rectifiers n the last year. I had one that was 1V off and 1 that did not accept a input current limit. All the others worked like they should.
For the megmeet rectifiers exist different firmwares. With one Version you only get output current when the can is always talking. I do not know if there are also for other rectifiers different firmwares.

 

[trogalko]

I would just try to send only one offline message to one psu wuth an USB-CAN converter and see what happens.
I have programmed about 150 rectifiers n the last year. I had one that was 1V off and 1 that did not accept a input current limit. All the others worked like they should.
For the megmeet rectifiers exist different firmwares. With one Version you only get output current when the can is always talking. I do not know if there are also for other rectifiers different firmwares.

I did send one offline message to one (each) psu using esp32->mcp2515 and nothing happens, it remained outputting 51.8V. I'll buy USB-CAN converter to test it, or it is work too to config the psu using USB-RS485 converter?

 

[dominik h]

If you are shure that you used the right code then a USB-CAN converter will not change anything. Probably your psu has a different firmware or is defectiv as you already wrote.