Lyen controller not working at 37V

[cwah]

Hello there,

I've just received back my controller from Lyen after it stopped working after I used it for 30 seconds. Now it's repaired but last time the controller melted and I didn't even know why and I still don't know the reason... (and Lyen charged my for shipping cost on both way and repair cost so no such things as warranty with Lyen)

So I want to make sure it's working now and I'd like to limit the current at 25A and make it work at 37V too.

I've installed the program and here is what I have:
The low voltage is at 18.8V here and I click on "Start transmit"


Then I transmit and put the transmit button as described on Lyen manual



Now I can stop it, I clicked on "stop transmit" and I have the "finished" feedback:


The problem now is that the bike is still not working with 37V battery. But it works with my battery at 74V. I suppose the data transmission hasn't been done?

Do you know how I can make it work at 37V?

Thanks a lot,

[motomech]

Lyen's default LVC for 12S Lipo is 37V, probably no coincidence.

[cwah]

Yes, but how can I change that?

It seems to be working on the program but nothing changes.

[miuan]

is your 5V and 12V rail holding full voltage?
it may be that your voltage regulators are low on voltage and can not power the MCU or hall and throttle sensors. check them, they should be LM317 for 12V and 7805 for 5V. if this is the issue, you may need to lower the R1 value to about 300 ohm to run at 36V.

[DAND214]

Might be a dumb question. Did you see the transmit bar go accross the program?
My com is 3 and it shows that it transmits but doesn't do anything if on wrong port.

Also my low voltage is exact what I want not 10vplts or so less.

It's a keywin eb312 board. I would guess they are the same.

Dan

[cwah]

Mian, sorry for my newbieness, but what's a 5V and 12V rail? Do I have to check the wires on my throttle?

Dand214, I've seen the bare go up on the program.

[NeilP]

Mian, sorry for my newbieness, but what's a 5V and 12V rail? Do I have to check the wires on my throttle?

5 volt can be checked at the throttle, but Mian is talking about opening up the controller to check them
.

What controller from Lyen do you have exactly? have you spoken to Lyen about this yet?

[Jeremy Harris]

Check with Lyen.

If the controller has linear voltage regulators (the LM317 for 12V and 7805 for 5V) then it needs resistors changing to work at 37V. These resistors are used to drop the incoming voltage to a safe level (below 40V) for the LM317.

If the controller has the switched mode regulator, then it should be OK for a wide voltage range and just need programming.

Lyen should be able to tell you which version you have.

[shock]

^ What he said. I believe the resistor network must be changed to run that low of voltage on a 12 FET

[NeilP]

I believe the resistor network must be changed to run that low of voltage on a 12 FET

Is that true of them all ? I am not so sure

I do believe that some controllers have a Switched Mode Power Supply front end that allow a very wide range of voltage inputs. But still, even a SMPS style power input front end, may still need resistor change to work.
From what I have discovered in the last two days trying to get my controller working again, there are at least ( if not more) 3 different design of power front end on the Xie-Chang / Infneon boards

There are two issues here that have be alluded to, but not actually named, and either one may require a resistor network change to fix:
1). LVC issue
2). Power stage issue ( would show itself by low 12v & 5v lines)

As wevhave said, only way to find out is speak to Ed Lyen and see what he has built the board to accept.
Since I have been lead to believe all the newer boards have SMPS power input stages, I suspect an LVC issue.



Oh....... A thought......I was struggling with this issue too, and overlooked the obvious. Do you have a Cycle Analyst? Is it plugged in to the controller?
Do you realise that a CA has an LVC setting too? And if that is set higher than the LVC on controller, then it will not work either. If you have a CA, unplug it. Now does controller work

[cwah]

Thanks guys.

I have this controller:
viewtopic.php?f=31&t=18214

I have a cycle analyst and put the LVC to 32V so that should be fine.

I talked to Lyen and he told me to remove the tiny 1.2K resistor on the bottom of the controller board in order to increase the LVC.

Will try it tonight to see how it works. If it doesn't I'll try to check the power stage issue.

[NeilP]

But you do not want to increase LVC, you want to decrease it

Think that was a typo on your part?

If the resistor he is talking about, is a standard axial type in a piece heat shrink, then that will likely be the R12 style mod or similar. If this has been done (r12mod) then the figures you enter in to the software need to be factored
Can't think exactly how to work it now, but it is easy enough,

Also, why did you buy high voltage controller then run it at so low voltage? You will have the higher voltage, lower current 4115 FETS in there.

Seeing your sig, Are you in London? Anywhere near Biggin Hill? I am often over there at the airport with time to kill

[cwah]

Lyen told me that
"The low voltage cutoff formula for your high voltage controller is the program "halt voltage" for low voltage cutoff "LVC" = (real LVC)/2. So 18.8v = 37.6v is about right."

Then if I "desolder the tiny 1.2K resistor on the bottom of the controller board. Then the program LVC value is then the same real LVC value"

Not really sure how electronic works. Just applying

[NeilP]

Yes, that will be right, R12 is also 1.2k so if the mod resistor on the rear is 1.2k the that is correct

Read to bottom of controller sale page you linked to earlier, first page, knuckles post about modding for other voltages
I have not read other pages yet, do maybe more there too

[number1cruncher]

Also, I believe your IndicateMode should be 1:Comm GND when programming.

[cwah]

Thanks guys, I'm going to try to remove the R12 resistor and use 1:Comm GND when programming.

[cwah]

This little resistor is sooo small:


How do I desolder that? There isn't even solder on the other side of the board. I may just burn it???

[NeilP]

You are not supposed to be removing that one, that is R12 itself, you are supposed to be looking for annextfa one on the back of the board, a normal one , possibly in a piece of heat shrink sleeving.
Take that off and you will likely have to send it back again
Show us a pic of back of board

[cwah]

Thanks Neil. Lyen contacted me and told me it was the little one with brown red red. I've only found this one:


On the front I haven't found anything that look like this:


Hope it's going to be the right one this time.

[cwah]

Ok, has been confirmed by Lyen. Going to remove it

[NeilP]

If you are going to be workng with this sort of stuff, and are not familiar with colour codes on normal resistors, or the number codes on the SMD resistors

try this little freeware app...Windows only

http://www.schematica.com/resistor_colo ... sistor.htm

[cwah]

I downloaded the program, will use it if I have to desolder other stuff in the future.

It's working at 37V now, so nice

Thanks all and Neil and also Lyen for his advice

[NeilP]

That is good to hear

But one question
Why after buying a high voltage controller have you decided to run at such a low voltage?

[cwah]

Good question!

Why I purchased my controller, I wasn't really sure of the performance my my conhismotor mini hub. But I wanted to reach 30mph. So in case if my 74V set up is not enough to reach 30mph, I can still increase the voltage without having to change the whole set up.

Now, most of the time I won't rum at 37V, I'll use it only for long distance journey in which low speed amd high efficiency is required.

This choice isn't that random lol

[NeilP]

yes, makes sense, but even from 74 volt, you col dhave stil gon up to 24S and 100 volt with the standard controller. just needed the R12 mod, and only then if you needed the regen