Regen with lyen controller

[Raphael]

Hi

We have 2 lyen mark II 9 fet regen controllers, they work very smooth, way better than the crystalyte we had before.
Now I'd like to enable regen. We do not have e-brakes (yet).

1. possibility: enable throttle regen. However, I am not able to make that work. I configured it with Lyens software (slip mode = true) but it doesn't work at all. It only brakes when I short the brake-wires, I would have expected it regens when I zero the throttle?

2. possibility: install these: http://www.aliexpress.com/store/product ... 67226.html But I have only a 2-pole connector, not a 3-pole. But I think it would be possible to take 5V from throttle and power that sensor

3. possiblity: install e-brakes (which?)

What is your opinion on that? What would you do?

Thank you
Raphael

[wesnewell]

I'd probably figure it out myself. But since you bought it from Lyen, you should probably contact him.

[Raphael]

What do you mean by "I'd figure it out myself"? I thought a forum was there to ask questions???

I already contacted Edward Lyen, and while he was helpful, he can't / doesn't tell me why throttle regen doesn't work.

[Sacman]

How many volts are you running? I thought I saw somewhere that the regen on Lyen controllers won't work if you're running above 80 volts. And I've verified it for myself. I have an 18-FET Lyen mark 2 controller and the regen works when I'm running 12s LiPo but doesn't work when I'm running 24s LiPo.

Hi

We have 2 lyen mark II 9 fet regen controllers, they work very smooth, way better than the crystalyte we had before.
Now I'd like to enable regen. We do not have e-brakes (yet).

1. possibility: enable throttle regen. However, I am not able to make that work. I configured it with Lyens software (slip mode = true) but it doesn't work at all. It only brakes when I short the brake-wires, I would have expected it regens when I zero the throttle?

2. possibility: install these: http://www.aliexpress.com/store/product ... 67226.html But I have only a 2-pole connector, not a 3-pole. But I think it would be possible to take 5V from throttle and power that sensor

3. possiblity: install e-brakes (which?)

What is your opinion on that? What would you do?

Thank you
Raphael

[Raphael]

I run 16s A123... as I said above, regen actually works if I connect the brake-wires, but zero-throttle regen doesn't work (I suppose it should do the same if "slip mode" is enabled)...

[Sacman]

Wait... what... you get regen to work when you short the brake wires?
I thought shorting the brake wires only cuts the power to the throttle and that's it?

I am not able to make that work. I configured it with Lyens software (slip mode = true) but it doesn't work at all. It only brakes when I short the brake-wires, I would have expected it regens when I zero the throttle?

[Raphael]

it cuts the power and brakes with regen - if you connected the "regen jumper wire". That's how I'd expect it to work at least, if you attach some e-brakes...
But I'd like to try it out with full regen on zero-throttle!

[Sacman]

I got my Lyen controller just last month. It's on my bike and I'm running it but not everything is hooked up (regen, cruise control, ebrake, etc.) But I did bench test it and got regen to work only with 12s Lipo and by momentarily shorting the 2 white regen wires. In fact I ordered (and am waiting for) a new throttle with integrated momentary regen button from ebikes.ca. I never got any zero-throttle regen to work nor did I get the regen to engage by shorting out the yellow and black ebrake wires. I haven't gotten to play around with the software settings yet so I didn't know about the slip mode settings until now.

[Raphael]

shorting those two wires activates regen - but I'd like to try it with zero throttle!

[wesnewell]

What do you mean by "I'd figure it out myself"? I thought a forum was there to ask questions???

I already contacted Edward Lyen, and while he was helpful, he can't / doesn't tell me why throttle regen doesn't work.

Well, I said "probably", as I have with the controllers I have. I don't have a Lyen controller, but if it's supposed to work and it doesn't, and he can't tell you why, I'd ask for a refund.

[wesnewell]

How many volts are you running? I thought I saw somewhere that the regen on Lyen controllers won't work if you're running above 80 volts. And I've verified it for myself. I have an 18-FET Lyen mark 2 controller and the regen works when I'm running 12s LiPo but doesn't work when I'm running 24s LiPo.

If you run higher voltage than the controller is configured for, then regen will stop working. To get it working at higher voltages requires lowering the resistance in the LVC circuit, thus raising the LVC voltage. As an example, regen on my 72V controller wouldn't work above 78V. Fine when I was running 18s, but nothing with 24s. Lowering the resistance of the LVC circuit by adding another resistor across it raised LVC and allowed a higher regen voltage. I used a var so I could adjust it. Got lvc set high enough so regen works all the way to 100V. The ABS system also follows the LVC voltage, but I don't have it hooked up although I'm thinking of switching to it since it will bring your bike to a quick complete stop where regen braking at 100V isn't near as strong and cuts out at about 10 mph.

[itchynackers]

Is your "EBS Limit Voltage" set too low?

[Jeremy Harris]

There is a stack of info on here as to how regen works on the Xiechang/"Infineon"/Keywin etc controllers that Lyen sells. Will Newton did a pretty good write up of the way the settings work, with some comments on the need to do things like mod the LVC to get regen to work over 75 V. Although much of the stuff in this thread is old, it's still useful and still generally applies to the Xiechang controllers that Ed Lyen sells: viewtopic.php?f=2&t=14807

[Raphael]

Is your "EBS Limit Voltage" set too low?

no, because otherwise regen with the cables shortened wouldn't work either, right?

[Raphael]

There is a stack of info on here as to how regen works on the Xiechang/"Infineon"/Keywin etc controllers that Lyen sells. Will Newton did a pretty good write up of the way the settings work, with some comments on the need to do things like mod the LVC to get regen to work over 75 V. Although much of the stuff in this thread is old, it's still useful and still generally applies to the Xiechang controllers that Ed Lyen sells: viewtopic.php?f=2&t=14807

thanks, I'll read through that...

[Ypedal]

I need to go read that link above.. but just a quick bit of into from my personal KMX experience..

Regen only works for me by shorting the yellow/black ( ebrake ) wires.. as long as the white wire is hooked up.. if i disconnect the white wire, regen does not work.

I run 24S lipo. 100v, below 10kph i get no regen.

[Raphael]

I've read through the thread, nothing new in there to solve the problem
Yes Ypedal, that's what I experienced too, connect the white wire to enable regen generally and then make a switch somehow to on/off the regen on black/yellow. But Lyen told me it's possible to enable throttle-regen - and I can't get it to work so far...

Otherwise the controllers are great and Edward Lyen was always super-helpful...

[Ypedal]

I would not want throttle regen enabled anyways.. i like to pulse and glide, letting off the throttle compeltely and coasting to stops when possible, and when i do let get of the throttle i dont want the regen to kick in un-expectedly..i want to pull the lever when i want it.

You can use a simple magnet with double sided tape on the brake lever, a bike wheel speed sensor as an on/off switch in proximity to the magnet and whamp.. ebrake on your own lever.. ( thanks Rick ! )

[Jeremy Harris]

I've read through the thread, nothing new in there to solve the problem
Yes Ypedal, that's what I experienced too, connect the white wire to enable regen generally and then make a switch somehow to on/off the regen on black/yellow. But Lyen told me it's possible to enable throttle-regen - and I can't get it to work so far...

Otherwise the controllers are great and Edward Lyen was always super-helpful...

I take it this is the problem you're referring too:

1. possibility: enable throttle regen. However, I am not able to make that work. I configured it with Lyens software (slip mode = true) but it doesn't work at all. It only brakes when I short the brake-wires, I would have expected it regens when I zero the throttle?

If so, then to make throttle regen work (which is really throttle off regen for these controllers) have you followed the instructions in Will Newton's paper in that thread? Specifically these instructions:

"16. EBSLimVoltage- This is the maximum regeneration voltage. !! Dependent on the R12 voltage divider !!The same rules apply for the REGEN voltages as LVC voltages shown above. 55V, 60V, 75V correspond to 66V, 72V, and 90V"

"26. SlipChargeMode- The Slip Current Charge Mode feature is either "ON or OFF" and allows regen from the throttle. Throttling back when cruising will regen the Direct Drive hub motor and slow it down to about 15% of full speed. The eBrake regen and the Throttle regen act independent of each other. I set the Throttle regen to "OFF" by default (I like to coast freely when throttled back). Values are 0: UP 15 Mark (throttle regen) and 1:Only Fake Indicate (no throttle regen)"

"27. EBS Level- This sets the strength of the regeneration. A higher number is stronger.When the eBrakes are applied the Direct Drive hub motor will slow down to a complete stop. values are 0: (low), 1: (med.), and 2: (high) Setting 2: has been recommended for 26" wheels if you are using regen and the other numbers for smaller wheels."

In addition, you have to follow this instruction to jumper the regen link:

"Jumping (or connecting a switch) from BK to GND activates the Regen braking feature."

The most common reason for regen not working is either the regen link not being there, the programming not being set or the battery pack voltage being over the limit.

FWIW I agree with Ypedal, throttle off regen feels wrong to me, it was like engine braking on a car and just felt a bit odd on a bike.

[John in CR]

I use Slip Charge = 0: Ture and regen comes on when I let off the throttle. It doesn't even have to be throttle 0. It works great as long as the regen force is fairly mild like it is with speed wind motors. Twist to go and let off to slow down can be liberating in its simplicity. I've gone entire rides never touching the brake.

Ask Lyen if that doesn't work for you.

[wineboyrider]

I need to go read that link above.. but just a quick bit of into from my personal KMX experience..

Regen only works for me by shorting the yellow/black ( ebrake ) wires.. as long as the white wire is hooked up.. if i disconnect the white wire, regen does not work.

I run 24S lipo. 100v, below 10kph i get no regen.

24s with the stock lyen 9fetter?

[zooz]

Recently I installed a new Lyen 12 FET Mark II enhanced controller. What I did to get regen to work on 18s2p RC Lipo running HS3540:

1. Make sure white wires on the controller are connected (this enabled Regen function)
2. Make sure Regen is enabled and set to 75V software wise
3. Install a push-to-make button near the left brake lever

Well, at least that's what I did and it works very well. That's the first braking regen experience to me, so I will tell you what I observed after a few rides. Few things to note, that when my battery pack is hot off charger at 75V, regen does not work as expected, because pack is full and secondly it's already at 75V.

Let's assume your battery pack is at 70V with some capacity already used and EBS Level is set to 2. If so, then regen should definitely work. The faster you're moving the more amps you're going to get out of braking. Usually I manage to get around 13-15 amps for a few seconds and then it drops down as I am stopping.

From my experience braking regen does not stop you to a dead stop, it kind of cuts off when you're moving at 5-10km/h, so then you have to use your normal brakes or even before, because at slow speeds there is not much braking happening out of regen.

Give me a shout if you want to see some pictures of my push-to-make button hack.