far driver controller and MXUS motor

E

erthservnt13

1 mW
Joined
Mar 4, 2024
Messages
11
Location
Southern Illinois
Does anyone know if the NS or ND series of fardriver controllers will operate an MXUS motor successfully? My last Sabvoton racked up a whopping 51 total miles before suiciding itself. I am done giving that controller brand opportunities to disappoint me. 2 nonperforming POS's in 6 months. I had them insured so the replacements didn't cost me $, just frustration. Sincere apology for whining. I am in dire need of 2 wheel therapy.
 
If the sabvoton can drive the Mxus than the fardriver can do this also.

I had installed a SVMC72260 and a SVMC72150 in my scooter, both died with field weakening in a no load scenario.
Then I changed to Fardriver. First a ND72680 now an ND721800. They can handle motor phase short circuits, field weakening and a bms that cuts the battery during regen. The last two of them will shure kill the Sabcoton SVMC.

The only thing the fardriver does not have is variable regen with a second 0-5V input
My ND72680 had a variable regen over the throttle my ND721800 only has a fixed regen either activated with throttle zero or with high or low brake.
I also have installed a ND72450 wich does not have variable regen.
There exist different versions from the fardriver Controllers with more or less functions. But all will drive your mxus with hall sensors.
 
Sincere gratitude for taking the time to respond and especially including the details of your vehicle. i am overjoyed to learn that in your experience the Fardriver can handle "motor phase short circuits, field weakening and a bms that cuts the battery during regen." The Sabvotons I installed and operated could not. They were surely killed. I was able to acheive the highest speed at 63 mph with the sabvoton thus far. Previously acheived 58 mph and 60 mph both with low quality NB Power controllers that also suicided themselves. i am riding a hard tail aluminum MTB with 29" wheels and 2 3/4 inch wide off road tires and a stock front suspension. bike, battery, and motor weigh 71 lbs. I am 6' tall and weigh 170 lbs. I carry a Stihl chainsaw on my back in a pack when I am working in the forest as a sawyer. I have gotten it down to 13 lbs. I have a 72 volt 80 amp 3000 watt mxus 3k turbo hub motor. my battery has an 80a bms and it is 20 ah. I ride mostly off road but have upgraded to 4 piston caliper brakes with larger disks and installed headlight/taillight/turn signals and additional lights to ride on roads with cars. i am pursuing a Biology/Ecology degree. The bike has been amazing deep in the forest creeping slowly as well as any other terrain between my home and campus. It is fast! I have to get a better battery and a better controller. Having a less than a 20 mile per charge capability and periodic system failures is the f*@%*g worst. May you have Peace & Blessings for your generosity in sharing information. I am going to purchase a Far-Driver controller, a new front suspension, and a new battery immediately. when judged by its ability to travel across all earth surfaces, It has been the single most capable vehicle I have ever ridden/driven as well as the biggest pain in the ass machine I have ever operated.

Your motor is 400 amps! 10,000 watts! how much does your battery weigh? vehicle weight?
ERTHSRVNT13
 
The battery is a high power pouch Li-NMC 21S5P battery made from 105 pieces 20Ah cells (7,7kwh) and weights over 70kg. The cells can do continous 8C discharge and 5C charge.
The scooter wheights over 190kg
The motor is a QS273 60H 10000W and during acceleration I let the controller draw 400A , which is around 30kW.
The motor could probably handle 35-40kW but my BMS can´t.

Before I had installed a QS260 40H 60V5kW motor and had driven it wiht up to 25kW which was a little to much , as even on flat roads the powere was limited after 15-20 minutes driving.
The Fardriver does reduces the power to the motor when the motor gets over 140°C. The more you get over 140°C the more the power gets reduced. If you do not have a temperature sensor the Fardriver can even do a motor temperature calculation.

Link to my build
Masini Extremo
 
Last edited:
dominik h said:
If the sabvoton can drive the Mxus than the fardriver can do this also.

I had installed a SVMC72260 and a SVMC72150 in my scooter, both died with field weakening in a no load scenario.
Then I changed to Fardriver. First a ND72680 now an ND721800. They can handle motor phase short circuits, field weakening and a bms that cuts the battery during regen. The last two of them will shure kill the Sabcoton SVMC.

The only thing the fardriver does not have is variable regen with a second 0-5V input
My ND72680 had a variable regen over the throttle my ND721800 only has a fixed regen either activated with throttle zero or with high or low brake.
I also have installed a ND72450 wich does not have variable regen.
There exist different versions from the fardriver Controllers with more or less functions. But all will drive your mxus with hall sensors.
Click to expand...
Hi!
Have you faced to an issue when Fardriver suddenly stops responding to throttle and regen, while it still online, showing no errors in the app, showing correct RPMs. Need to stop the wheel completely, after that Fardriver recovers and allows to use the throttle again.

That problem which I cannot solve for almost a year:(( Tried everything. Somehow only decreasing phase current helps. Also turning off flux weakening helps a lot but yet sometimes (rarely) it still stops responding.
 
No, always had an error , even when it only was shown for a short time.
 
Probably my controller hardware is defective:((( or firmware? Have you ever tried updating firmware on your Fardriver ? Is it possible?
dominik h said:
No, always had an error , even when it only was shown for a short time.
Click to expand...
 
I had to update the Firmware from my ND96850 two years ago, as it had the ND72850 Firmware.
I could not get higher than 90V with the over voltage protection.
 
dominik h said:
I had to update the Firmware from my ND96850 two years ago, as it had the ND72850 Firmware.
I could not get higher than 90V with the over voltage protection.
Click to expand...
Can you please describe how to do this? Or probably you have some english manual(user guide) for firmware updates and for all the settings in the app? Really appreciated🙏
 
Firmware update ist not described in the manuals I had found in the internet.
I had done it with the old app version 1.3.7. It was during a live session with a technician from Siaecosys.

The new app is different, and it is over two years ago I had done this.
I don´t think I can write a good manual for it.

Why not ask your seller. If it was DUN or Siaecosys they can provide you a video how you do the update.

I think in the new software you have to press "upgrade" and then you will see a list of files from the internet or you can link to a local file, but I am not willing to try it , as my controllers are working, and never change a running system ;)
 
dominik h said:
Firmware update ist not described in the manuals I had found in the internet.
I had done it with the old app version 1.3.7. It was during a live session with a technician from Siaecosys.

The new app is different, and it is over two years ago I had done this.
I don´t think I can write a good manual for it.

Why not ask your seller. If it was DUN or Siaecosys they can provide you a video how you do the update.

I think in the new software you have to press "upgrade" and then you will see a list of files from the internet or you can link to a local file, but I am not willing to try it , as my controllers are working, and never change a running system ;)
Click to expand...
Unfortunately, the seller is from Aliexpress and in the chat it's only some sort of first level support, who gives common advices like "it's your battery fault" or sometimes asks their "engineer" and forwards the reply back to me. The most what they suggested is to adjust AN, LM parameters, for removing excessive vibration in cruise control function. Helped a little bit. But the main problem - controller suddenly becoming unresponsive - not solved. At least, if somebody could help me to make the controller restartable while wheel is rotating - it would be very good. Because its the main problem.

My sabvoton also sometimes stopped responding but re-starting it by switching ignition off/on helps. Sabvoton can restart while I'm in the middle of a road at a high speed
But fardriver is dangerous sh..t, as in case of any failure it DEMANDS me to do full stop (hard to do on a freeway). Probably there's some firmware without this annoying behavior...
 
If you press on upgrade and local files you get a list and down there are a few firmware.
The .hex files are the firmwares

Your phone needs to be connected to the controller and the internet.
Screenshot_20240611_160553.jpg
 
If I had the same failure with two different Controllers , I would not excpect a firmware update will solve my problems.

I have driven over 10000km with a SVMC72150 and only had one error ( over current error) during an full throttle uphil ride with nearly constant power between 12-14kw for more than 20 minutes.
 
dominik h said:
If I had the same failure with two different Controllers , I would not excpect a firmware update will solve my problems.

I have driven over 10000km with a SVMC72150 and only had one error ( over current error) during an full throttle uphil ride with nearly constant power between 12-14kw for more than 20 minutes.
Click to expand...
Not the same... Sabvoton is fairly good, it became unresponsive in extremely rare cases, and I believe it was due to bad hall sensor connection.

But fardriver is stable at its failing, displaying no errors, and the most annoying - requires full stop to recover.
 
The worst is that I rely on regen braking a lot, as I have only bicycle 203mm front disk and no other brakes. So when fardriver stops responding, I'm loosing my main braking. And if this happens downhill at 100kph - I'm f..cked up.
 
When you stop with the fardriver, the shown errors get reseted and deleted.
I wish they had a an error log and the data logging function would store more than 50seconds or at least store the last 50 seconds.
 
dominik h said:
When you stop with the fardriver, the shown errors get reseted and deleted.
I wish they had a an error log and the data logging function would store more than 50seconds or at least store the last 50 seconds.
Click to expand...
Actually, I was observing for the errors right after it stopped responding, before I stopped the bike. And still there were no errors at all.
 
the
problem seems to be fixed on my bike... I simply purchased another ND72680 plus ND72890 and both are working great. No sudden disconnection, no stop responding on throttle.

I conclude that my first ND72530 is faulty.
 
Have you made a picture of both new Fardrivers next to each other to make the different size vissible?
 
dominik h said:
Have you made a picture of both new Fardrivers next to each other to make the different size vissible?
Click to expand...
Nope. But nd72680 is the same in size, yet the model on the label is slightly different, another letters after the "nd72680".

Nd72890 is about 10%bigger and the metal radiator plate is flat, massive but flat. On 72680, radiator has ribs for better cooling. I'm wondering if the 72890 must be attached to something bigger for better cooling 😕
 
Btw I managed to get 314A battery current, after setting low voltage limit to 58v. So my battery 72v60-75Ah is the weakest point now. Even charged up to 4.10v, it drops lower than 60v at 314A.

Speed maximum was 127kmh today😁
 
I started celebrating too early :((( the new ND72890 also turns off:( first several rides were all fine. But yesterday it happened again. If the battery is half discharged, and I try to open the throttle quickly and at maximum, the controller turns off:(((

And recovery is only possible after full stop. Thats the most annoying part. I wouldn't be bothered much, if the controller could reset on the go...
 
Same behaviour when the bms shuts the battery off.
Which max current can the bms handle?
 
dominik h said:
Same behaviour when the bms shuts the battery off.
Which max current can the bms handle?
Click to expand...
It's hard to tell. I have complex battery, consisting of 3 separate batteries, connected in parallel only by power wires. Each battery has own bms.
1) 72v 27.5Ah bms probably for 80A
2) 72v 26.5Ah, bms probably for 50A
3) 72v 21Ah, bms probably for 50A

And what I cannot understand, why first several rides on the new controller were perfect, yet I discharged the battery more deeply in that rides.
 
In addition, the only parameters which I changed since the perfect first rides, are Throttleacc, throttledec, from default 128 up to 150 and then to 170. Probably it somehow affected that controller/bms started "thinking" that it's short circuit when full throttle opened rapidly.
 
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