S12S / S-LCD3 problem

[Golyo]

This is what happens when I turn it on, and the battery is around 39.2V:

This should show a cutout, unfortunately, the display is too dim to see anything:

edit: actually I have an idea. When I tried to make the PAS work I noticed that the signal voltage was quite low (around 4.1V) even with a full battery. What if the DC-DC converter in the controller is faulty? Or maybe is not faulty only it was meant to be used with a 48V battery?

 

[JuicyBike]

Agree with Awol above: try setting C11 to "1"
You may have an older controller not able to provide all the signals that this display would like. Setting C11 to 1 eliminates some assumptions made by the LCD. See page 32 of the manual. Good luck to you!

 

[awol]

I know you've said it worked ok at the beginning but I would also double check the 5 coloured wires from the LCD3 plug match the same colours wire going into the controller on the socket.

 

[Golyo]

Agree with Awol above: try setting C11 to "1"
You may have an older controller not able to provide all the signals that this display would like. Setting C11 to 1 eliminates some assumptions made by the LCD. See page 32 of the manual. Good luck to you!

I did try that today (C11=1) nothing changed. (maybe the wattage wasn't shown, but it was very hard to see the LCD).
I started today with the battery @39.4V and came home with 38.8V. The frequency of the cutouts seems to increase, but it is only a feeling, very hard to prove.

 

[Golyo]

I know you've said it worked ok at the beginning but I would also double check the 5 coloured wires from the LCD3 plug match the same colours wire going into the controller on the socket.

Checked them now, the colour coding is okay.

 

[trex]

Can you do the following test?
discharge the battery to 36V. Then switch on the bike.
If the bike works OK then the LCD3's automatic 24/36/48 voltage detection mechanism does not function correctly.

 

[Golyo]

Can you do the following test?
discharge the battery to 36V. Then switch on the bike.
If the bike works OK then the LCD3's automatic 24/36/48 voltage detection mechanism does not function correctly.

The LCD shows my battery full at all times (41.3-38.8V). Why do you recommend 36V?

 

[trex]

in your video, the LCD detects 36V correctly in the first 2-3 seconds then dimmed out, ie it seems to identify your battery as 48V.
That could be the result of the 5V regulator inside the controller gone wrong after a few seconds, but more likely that the LCD thinks your voltage is much higher than 36V.

 

[Golyo]

in your video, the LCD detects 36V correctly in the first 2-3 seconds then dimmed out, ie it seems to identify your battery as 48V.

It is quite dim, but still it shows my battery full. I haven't seen it showing my battery anything but full, apart from the first few moments after a boot.

 

[Golyo]

I could only find an electric stove for the discharge and it is pretty slow. But it means I could check what happens at 38.2V. The display is barely visible, and when I am trying to change settings it cuts out. Now that is really strange. By morning I guess it will be discharged to about 36V.

edit: still I don't understand why you said that it is the fault of the display and not the controller.

 

[Golyo]

Update: battery is @37.2V and everything looks perfect. I have never seen the display so bright. Only one small detail bothers me: the display shows the battery full, and changing the P5 value hasn't corrected it. Managed to install a PAS. I will give it a good go today.

 

[JuicyBike]

Update: battery is @37.2V and everything looks perfect. I have never seen the display so bright. Only one small detail bothers me: the display shows the battery full, and changing the P5 value hasn't corrected it. Managed to install a PAS. I will give it a good go today.

Well that's good news. I'm sure you've already checked you have a 36V (41.5V) charger, but just in case...

 

[trex]

Update: battery is @37.2V and everything looks perfect. I have never seen the display so bright. Only one small detail bothers me: the display shows the battery full, and changing the P5 value hasn't corrected it. Managed to install a PAS. I will give it a good go today.

that's good and bad. Good: you've now have a working bike. Bad: it seems to confirm that either the 5V regulator or the LCD is wrong. Can you check the 5V line to see if the voltage moves withing the first 3 seconds after switching on?

 

[Golyo]

that's good and bad. Good: you've now have a working bike. Bad: it seems to confirm that either the 5V regulator or the LCD is wrong. Can you check the 5V line to see if the voltage moves withing the first 3 seconds after switching on?

Could you elaborate, please?
Now, that the battery is below 38V, everything looks perfect. I ended the day with the battery @35.1V. I can travel at about 38km/h with around 250 watts (plus me pedaling), that is hugely impressive. The PAS is awesome. The whole thing is a little bit better than I've dreamed of. This is excellent fun!

Back to topic. The signal voltage is the same 4.11-4.13V at all times, no matter how charged the battery is. Now with the battery @35.1V I checked what happens at startup, and there is a very short moment when the meter shows 4.45V, but it is too short to give it any meaning, I think.

Now I am charging the battery to max, and we'll see what happens.

 

[Golyo]

Well that's good news. I'm sure you've already checked you have a 36V (41.5V) charger, but just in case...

Yep, the charger is good.

 

[Golyo]

These two videos show the display after boot up with the battery just over and just under 38V.

 

[trex]

Could you elaborate, please?
.

the LCD works on 5V. It measures the battery voltage with an internal divider - it's difficult to make the voltage drop just for the LCD, that's the bad news. You should ask the supplier for a replacement next time you buy something from them.

 

[Golyo]

the LCD works on 5V.

According to this wiring diagram, the display works on 36V:
https://endless-sphere.com/forums/viewtopic.php?f=2&t=57522

 

[Golyo]

I managed to buy the 72V display from the vendor. The page definitely states that it is for 72V battery, but later tells you how to use it with a 48V, 36V and 24V one. Confusing, eh?
https://bmsbattery.com/ebike-kit/737-72v-s-lcd3-lcd-meter-for-s-series-controlers-ebike-kit.html?search_query=S-LCD3&results=32