John Bozi said:
It seems I have another problem... It only started after I repositioned my controller and all the wiring, so I think something is different there. I tested again this morning on full charged battery and I still got a jerky kind throttle, but some how it kind of went away for the remaining ride. Power doesn't cut off just seems to be dropping to very low amounts of power, I will have to study the screen more on my next ride, maybe its the motor?
I am still a bit confused about the lvc.
With the temperature settings, I have a thrash = when it starts limiting @ 90 degrees and a final cutoff @ 125 degrees. That gives as I have noticed pretty clear gradual ramping down, (i've never gotten past 115 degrees because it is so well limited).
With the lvc though I only see one input for low voltage cutoff. That as you are saying is when it starts to work, but how do you set when 100% of power gets cut?
At least you introduced me to the lovgain, but I am not sure what the default 800 actually means or does.
I am running 12s 1p at the moment. Basically I want the power to be limited to zero @ 39v and get there gradually from 43v.
Okay - I probably didn't explain the LVC operation too well. Let me try again - maybe this will help.
Like the other limits (speed power, etc), and unlike temp which has special setup to define the roll-off range, the CA LVC is trying to eliminate the LVC limit situation by rolling back the power (throttle). The idea here is that due to resistance in the battery (and maybe a bit of wiring), less throttle will draw less current which will alleviate the voltage sag that arises from the current being applied to those resistances. In short, if you roll back the throttle, the voltage under load will rise, and the LVC condition may be removed.
So - if the CA can limit the throttle by a little bit and this makes the voltage sag recover and LVC alert go away, the CA will be happy. But if your LVC is set really low and the CA must throttle back a bunch to make the alert go away, it will do that. This is the same way the 'speed limit' works - it cranks down the throttle until the speed limit alert goes away.
The Gain value is just a dimensionless number that determines how rapidly the CA makes the correction (it's actually a multiplier for the integrated error, identical to IntSGain for Speed). So - if you pick a small number like
Batt->LoVGain = 10, then the gain is low and it will take a while for the CA correction to take effect. If you pick something like
Batt->LoVGain = 9999, the correction is almost instantaneous, and the LVC will cause immediate throttle rollback to ZERO.
There really is no way to set up the 39v-43v bracket that you wish (as with temp). You might try setting the limit to 40v and the gain to 50 and see if that more or less gives you the behavior you desire. Mostly this was designed to detect a single absolute limit and then try to hold the throttle to avoid exceeding it.
I'm not sure about the 're-positioning' issue. It may be related. Post back if more info comes to light......
