Wayne’s Dengfu Carbon Fibre FS 27.5” with Bafang M600 (throttle also)

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Re: Wayne’s Dengfu Carbon Fibre FS 27.5” with Bafang M600 (throttle also)

Post by tsellers » Oct 10 2019 7:53pm

Thanks for the responses!

I think they have me now in the camp that I'll just do the 48V build, I had not considered the aspect of the low battery algorithms as being yet another factor.
Regards, John

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Re: Wayne’s Dengfu Carbon Fibre FS 27.5” with Bafang M600 (throttle also)

Post by robocam » Oct 11 2019 7:30am

The low voltage cutoff of a 48V system is fine for a 52V battery. My Ego "generator" uses 52V batteries, and it cuts them off at around 39V, which is what you might find in a 48V system. I know this because I was comparing the Ego with a 48V inverter (links below). That's about 2.8V per cell. I wouldn't worry about it unless it goes lower than 2.5V per cell.

Plus on a bike, toward the end of the battery's capacity, the voltage will sag quickly, so it should trigger the LVC as soon as you try to put down any power.

If I had a choice between 52V or 48V at the same Ah, I'd choose 52V no question about it, but if capacity is affected, I'd choose the one with more Wh because range is more important to me for a drive like this.

https://egopowerplus.com/nexus-portable-power-station/

https://smile.amazon.com/gp/product/B07 ... UTF8&psc=1
tsellers wrote:
Oct 10 2019 7:53pm
Thanks for the responses!

I think they have me now in the camp that I'll just do the 48V build, I had not considered the aspect of the low battery algorithms as being yet another factor.

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Re: Wayne’s Dengfu Carbon Fibre FS 27.5” with Bafang M600 (throttle also)

Post by tsellers » Oct 11 2019 8:57am

Yes, you're pretty much spot on for the two 13S5P 48V batteries I built last month with the BMS's that the battery seller supplied. The cutoff is around 39V. As I'm submitting my battery order today, I've just added a 14S 20A BMS and 52V 2A charger, and I'll have the flexibility to build either 48 or 52V. As I have requested a second empty battery case, it might be tempting to use the second one to build a lightweight 21700 5A 13S1P reserve battery to carry as a backup.

Thanks for those links, I'll have a look.
Regards, John

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Re: Wayne’s Dengfu Carbon Fibre FS 27.5” with Bafang M600 (throttle also)

Post by robocam » Oct 11 2019 1:31pm

How to remove your battery if you don't have a key. https://youtu.be/hDMUdn7omyE

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Re: Wayne’s Dengfu Carbon Fibre FS 27.5” with Bafang M600 (throttle also)

Post by Leeleeducati » Nov 04 2019 8:32pm

waynebergman wrote:
Oct 15 2018 5:16pm
Got a response from Bafang themselves today regarding my questions on the connectors. purple orange.jpg
Photo here shows some new insights. Looks like the connector labeled in purple #1 is split out to 4 other connectors. The circle in orange shows the 4 into 1 splitter but on my bike I did not see this as its most likley hidden between the motor and the frame somewhere. The good news is the motor does in fact support a throttle. The 4 into 1 split has the throttle as a 3 pin so this makes sense. I see from the support PDF document with the chinese text and drawing the the connector labeled in purple #2 is actually for the e-brakes so this is starting to make sense. Makes me think the other 6 pin purple under the chain stay is for a stop light but not sure.
Hi Wayne, in the wiring diagram pic, does the bottom cable in the red circle (with the four wires) look like it is looping back to the battery? With the picture cut on the bottom I can’t tell where that cable goes? Any comments would help.

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Re: Wayne’s Dengfu Carbon Fibre FS 27.5” with Bafang M600 (throttle also)

Post by tsellers » Nov 04 2019 9:58pm

Revisiting the question of whether to go with a 52 or 48V build for the battery pack, I stumbled across a Youtube post that examines that question and tries a 52V battery on an M600. My apologies if this was already referenced: https://www.youtube.com/watch?v=X2IPtda_LFo
Regards, John

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Re: Wayne’s Dengfu Carbon Fibre FS 27.5” with Bafang M600 (throttle also)

Post by waynebergman » Nov 04 2019 10:23pm

Hi Leeleeducati , sorry I can not remember where that cable goes. If I have to remove the motor for any reason I can look further into this for you.

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Re: Wayne’s Dengfu Carbon Fibre FS 27.5” with Bafang M600 (throttle also)

Post by Leeleeducati » Nov 04 2019 11:44pm

Thanks anyway. Any idea where that wiring diagram pic came from? If someone has the original with the bottom portion showing that could clarify things.

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Re: Wayne’s Dengfu Carbon Fibre FS 27.5” with Bafang M600 (throttle also)

Post by waynebergman » Nov 05 2019 10:19am

Hi Leeleeducati. It looks like I posted the screen shot originally so I got to looking around in my files and I found this.
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Hope this helps. Just curious, I have forgoten what stage you are at with your drive and ride. Are you making your own battery pack to work with this drive?

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Re: Wayne’s Dengfu Carbon Fibre FS 27.5” with Bafang M600 (throttle also)

Post by Leeleeducati » Nov 05 2019 11:21am

That’s perfect! Thanks soo much. So the battery does go back to that cable harness...interesting. I’m just collecting some pieces for the next build for now, got the M600 and OEM Bafang battery, no rush as I’m aiming for the next riding season. When I ordered the drive, they sent some cables which weren’t correct and then they sent some more so I’m just sorting through them. My throttle cable is the round yellow three prong connection (not the triangle yellow three prong). It all works, it’s not that loud at all powered at my desk. I connected all but that mystery BUS cableback that now we’ve confirmed goes back to the battery. My ebrake cable won’t work now as it was supposed to go to port one which is now taken up by the main display/throttle cable. Anyone interested in this drive needs to specify cable configuration at the start or it’s Bafang’s random choice.

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Re: Wayne’s Dengfu Carbon Fibre FS 27.5” with Bafang M600 (throttle also)

Post by waynebergman » Nov 05 2019 1:44pm

Yes Leeleeducati Bafang has been bad in my experience for attention to detail when it comes to replacement parts. Most likely its due the english/chineese translation and they just grab something off the shelf that has worked for the last application of repair or who knows what.

Anyways I will be most interested in seeing how you make out, if you got your motor and wiring supplied recently it may work totally different than mine as I am sure they have made changes since last Sept or October 2018 when I received mine. I have always thought this whole com port thing was a bunch of un needed nonsense. I think for me because my battery and throttle communicate to each other through the cabling supplied in 2018 I am stuck working with that, and I hope future battery packs from Banfang and wiring harnesses will work with my kind of prototype unit (I think I was first with throttle in North America). I just hope nothing goes wrong with any of the components, because if I have to order replacement parts like a battery pack, or wiring harness I am not sure if it will even be compatable with what I got. I say this because I really dont understand how it all works I guess, I will cross that bridge when I get to it.

Keep us in the Loop Leeleeducati, always interested in how others make this drive work for them..........wayne

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Re: Wayne’s Dengfu Carbon Fibre FS 27.5” with Bafang M600 (throttle also)

Post by Leeleeducati » Nov 05 2019 3:19pm

Pictures are always good... you can see the three wires that make up the yellow triangle plug off the battery, haven’t plugged it into the display cable end yet, haven’t built up the nerve to fry anything yet :) this is my cable config. No middle port ebrake cable yet. Might try and find one somewhere? As mentioned there’s many cable variations that plug the same way into port on the drive. The middle has been consistent for ebrake only and port three consistent for speed sensor.
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Re: Wayne’s Dengfu Carbon Fibre FS 27.5” with Bafang M600 (throttle also)

Post by Leeleeducati » Nov 07 2019 12:22pm

I took a chance, plugged in that BUS connection. Nothing zapped. It takes data from the battery, capacity, voltage, temperature.

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Re: Wayne’s Dengfu Carbon Fibre FS 27.5” with Bafang M600 (throttle also)

Post by waynebergman » Nov 07 2019 8:43pm

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Hi Leeleeducati, just checking.........in your previous photos that I have also attached here, I have added some colored circles for referance.
I am assuming the cables circled in yelo are for your throttle? Can you tell me please what the two wires are - that are circled in Red in the first photo?
I dont have anything like these wires showing in the Red circle so a little puzzled. I am guessing it is for a stop light or something if going with ebrakes?

Because the OEM battery packs have the com/port stuff and seem to supply needed power going directly to the throttle I am wondering how others have by passed giving low voltage to the throttle directly from an after markeet or home made battery pack. I am guessing if others with home made battery packs are giving low voltage to the throttle through the controler instead of through the battery pack but not sure how this is done.

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Re: Wayne’s Dengfu Carbon Fibre FS 27.5” with Bafang M600 (throttle also)

Post by Leeleeducati » Nov 08 2019 9:19am

The two leads circled in red are a voltage out. I measured, it's a constant 3.57V on a fully charged battery. I'm guessing for an always on taillight. As for the two yellow circled connections, they go together for the BUS battery cable connection. They are both Bafang's yellow triangle 3prong connectors. The lead from the battery for this yellow triangle connection is short, but that one I can extend. I did inquire about an extension cable for this connection but haven't heard back yet. My throttle connection is a round yellow three prong cable that goes into that main wiring harness along with the display and BUS. I don't believe the BUS cable has anything to do with the throttle, it's just for all this battery data that can be accessed in the display menu. I've also inquired about the middle port ebrake cable, still waiting on that.

The interesting thing with the throttle is that unless I'm moving (meaning running a magnet back and forth on the speed sensor) the throttle triggers an error 21 if there's no speed sensor input. I'm guessing this is something in the programming for safety or for a softer start on the components where it won't let you throttle without some movement first.

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Re: Wayne’s Dengfu Carbon Fibre FS 27.5” with Bafang M600 (throttle also)

Post by waynebergman » Nov 08 2019 10:42am

Thanks for this info Leeleeducati. The error messesage you are getting is not one that I have come across. My throttle works right from a dead stop as soon as you hit the throttle with no error message. The only error message I get on my unit is if you start pedeling or hitting the throttle too soon right after you power up the system. For some reason the bike likes to have about 10 seconds or so of no rider input after the system is first powered up before any torque rotation on the cranks or any throttle input. Once that intial 10 or 15 seconds after power up has passed you are good to go with no error messages. Sorry I can not remember the error code # reference it gives when this happens. I will take note of it the next time it happens and edit this to state error code number.

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Re: Wayne’s Dengfu Carbon Fibre FS 27.5” with Bafang M600 (throttle also)

Post by Leeleeducati » Nov 08 2019 11:10am

I just tried spinning the crank, waiting 15 seconds, manually inputting speed via magnet and still if I'm not "moving" I don't think the throttle works for long, in a few seconds I get Error 21. I'll have to see how it behaves on a bike when I eventually build this up. Let me know about your error?

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Re: Wayne’s Dengfu Carbon Fibre FS 27.5” with Bafang M600 (throttle also)

Post by robocam » Nov 08 2019 12:51pm

Error 21 is a speed sensor error, so it should go away when you have it on your bike.
Leeleeducati wrote:
Nov 08 2019 11:10am
I just tried spinning the crank, waiting 15 seconds, manually inputting speed via magnet and still if I'm not "moving" I don't think the throttle works for long, in a few seconds I get Error 21. I'll have to see how it behaves on a bike when I eventually build this up. Let me know about your error?

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Re: Wayne’s Dengfu Carbon Fibre FS 27.5” with Bafang M600 (throttle also)

Post by artyy » Nov 09 2019 5:27pm

Hi leeleeducati, where did you buy your battery from? I 'm especially interested in battery mount it seems to be made of metal (mine is tacky plastic) i am considering crafting one by myself, can you show more pics please?

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Re: Wayne’s Dengfu Carbon Fibre FS 27.5” with Bafang M600 (throttle also)

Post by Leeleeducati » Nov 09 2019 5:41pm

Hi Wayne,

Are you cool with me posting pics here? I feel like we may be hijacking your thread.

Lee

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Re: Wayne’s Dengfu Carbon Fibre FS 27.5” with Bafang M600 (throttle also)

Post by waynebergman » Nov 09 2019 11:03pm

HI leeleeducati. No worries at all regarding posting anything to do with these drives on this thread. I only ever wanted this thread to be a resource for these drives. Keep the info comming :)

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Re: Wayne’s Dengfu Carbon Fibre FS 27.5” with Bafang M600 (throttle also)

Post by Leeleeducati » Nov 11 2019 7:34pm

Here's some pics. The main connection came with a key lock, but wouldn't you know it Bafang's key doesn't work. I took it off. Also, the battery came with a cover that snaps and screws on which you could paint to match the frame.
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Re: Wayne’s Dengfu Carbon Fibre FS 27.5” with Bafang M600 (throttle also)

Post by artyy » Nov 14 2019 4:46pm

thanks Leeleeducati for pics. I wander if your frame's battery mount is the same as mine (the frame identical to mine is shown in Keppler's thread https://www.endless-sphere.com/forums/v ... 5#p1487395). My battery case is shown here (https://www.endless-sphere.com/forums/v ... 5#p1491605) I think it is total garbage. Where did you buy yours? I must admit the battery case is the most important obstacle I came across.

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Re: Wayne’s Dengfu Carbon Fibre FS 27.5” with Bafang M600 (throttle also)

Post by Animalector » Nov 16 2019 3:01pm

The Bafang battery is different to the one that fits the Dengfu frame. Bafang had an OEM battery that is 12s 3p. Their bigger 600Wh pack is 12s 4p.

I'm not 100% sure because I haven't actually seen the Dengfu battery case. I'm pretty sure they're different.

Andy

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Re: Wayne’s Dengfu Carbon Fibre FS 27.5” with Bafang M600 (throttle also)

Post by Leeleeducati » Nov 17 2019 3:56pm

I believe the Dengfu frame uses the BTF04 battery, the pics I posted are of the BTF03. Both are designed for use with the M600 depending on the frame you chose.

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