Problem with car stopping for no apparent reason

[supah]

I need some help figuring out why my Lazer zx-5 sometimes just stops up.

Suddenly its acting really weird, never been like this before - been running perfectly for a long time, then suddenly it has started to stop every now and then. Nothing happens when I squeeze the speed trigger, it just stands there. If I wait for a few seconds it will run again, but then stop not long after. Steering works while it stops, but throttle not responding at all.

Anyone got any ideas of what might be wrong?

The motor was a bit hot but I had no problems holding my fingers on it. The battery was not hot at all, nor was the ESC. It ran without any sort of problem last time, but today it was acting all up after I had been driving it for like 10ish minutes. Runs perfect, stops up, runs again, stops ect. As if it "cuts off".

Only thing I had changed from last time I drove it was a setting on the ESC, changing it from "4-7 cell Nimh racing mode", to "Lipo/Nimh automatic mode". So I was thinking maybe it cuts off Nimh batteries as well, and not just Lipos, with this setting? I changed it back to 4-7 cell Nimh racing mode, but the problem still occured.


This is my setup:
LRP 5.5T Brushless
LRP Sphere Comp. 2007 ed. ESC
3600 and 4200 Nimh batteries used while having problems.
Spektrum DX2 radio, Spektrum SR3000 reciever.

[bert digler]

Originally Posted by supah

I need some help figuring out why my Lazer zx-5 sometimes just stops up.

Suddenly its acting really weird, never been like this before - been running perfectly for a long time, then suddenly it has started to stop every now and then. Nothing happens when I squeeze the speed trigger, it just stands there. If I wait for a few seconds it will run again, but then stop not long after. Steering works while it stops, but throttle not responding at all.

Anyone got any ideas of what might be wrong?

The motor was a bit hot but I had no problems holding my fingers on it. The battery was not hot at all, nor was the ESC. It ran without any sort of problem last time, but today it was acting all up after I had been driving it for like 10ish minutes. Runs perfect, stops up, runs again, stops ect. As if it "cuts off".

Only thing I had changed from last time I drove it was a setting on the ESC, changing it from "4-7 cell Nimh racing mode", to "Lipo/Nimh automatic mode". So I was thinking maybe it cuts off Nimh batteries as well, and not just Lipos, with this setting? I changed it back to 4-7 cell Nimh racing mode, but the problem still occured.


This is my setup:
LRP 5.5T Brushless
LRP Sphere Comp. 2007 ed. ESC
3600 and 4200 Nimh batteries used while having problems.
Spektrum DX2 radio, Spektrum SR3000 reciever.

is it hot it may be thermal cutout

[mattym0310]

i had this very same problem with my x6, using same ESC. Have you tried swapping sensor leads or motors? could you post up a picture of your electrics layout? I know it's a long shot but it may help.

thanks

[supah]

All right, I just double checked the current ESC setting, and it is STILL on "Lipo/Nimh Automatic" mode. I mustv f*ed up while trying to change the mode with a small twig while out racing. So I just got it back to "4-7 cell Nimh racing mode", ran it for a good while outside and had no problems. It was running slower and slower, so I guess the battery had a low voltage, hence the stopping.

I thought putting the ESC mode to "Lipo/Nimh Automatic" would make the ESC figure out if there is a Lipo or Nimh battery used. And if Lipo is used the "cutoff" funtion will work. I guess this cutoff works no matter what battery I use while having the ESC in this mode?

[Mike Hudson]

correct the automatic mode cuts off when it a lipo nimh cells drop below a certain voltage so always use the nimh race mode when using nimh and only the automatic when using lipo

[supah]

Learning something new every day. Thanks for the replies, guys.