Power loss after few seconds of normal running - BBS02 52v

[Velho]

Hello fellow bikers!

I am trying to diagnostic a BBS02 with 52v shark pack for the following curious behaviour that is new to me.

The system runs as normal for about 3-5 seconds, then watts starts dropping fast to almost zero.

Changing PAS level brings the system back to normal functioning for another 3-5 seconds. (Normal riding can be achieved by changing pas levels all the time ))

Throttle has the same kind of response -> few seconds normal working and then power loss.
Releasing throttle and pressing it again does not have the same effect than changing pas level.

The system does not power off and all buttons function normally.

So far I have done the following:

-Checked all connections, terminals and connectors

-Swapped both display and battery to a functioning units

-Checked the parameters from the controller

Observations:

-No smell or strange sounds present
-Factory parameters on controller
-Lightly used city commuting bike

Before proceeding to work with the controller I would be happy to read your ideas where the problem could lay)

Kristian
Helsinki

 

[neptronix]

How many amp hours is the pack.. how old is it.. and what cells are inside?
Are these packs also fully charged?

I would suggest running a multimeter inline with the battery as you hit the throttle to see if it is what's cutting out.

The low voltage cutout on a 52v battery should be around 40v or so.

 

[Velho]

Thanks. The battery is 18ah.

What comes to measuring current from the battery. I expected the battery in the 1st place.

But as the same thing happens with a replacement battery when I tried the system with another - known to work - 11ah battery
I did not yet connect a meter between the battery and the controller.