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need help with low voltage detection on esc

Old 01-23-2013, 04:00 PM
  #1  
redraceepx
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Default need help with low voltage detection on esc

I have a tornado epx pro from redcat racing, Brushless and on a paper it says that the esc can handle a 7.2vnimh, 8.4vnimh, and a 7.4lipo. So i bought a 8.4v and put it in, low voltage detection turned on. can anybody help to stop this
Old 01-23-2013, 04:53 PM
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kyleshrub
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Default RE: need help with low voltage detection on esc


ORIGINAL: redraceepx

I have a tornado epx pro from redcat racing, Brushless and on a paper it says that the esc can handle a 7.2vnimh, 8.4vnimh, and a 7.4lipo. So i bought a 8.4v and put it in, low voltage detection turned on. can anybody help to stop this
Sounds to me like you have the ESC set to "lipo mode," or it wouldn't detect low voltage. Refer to your user manual on how to turn it off, since you're using a nimh.
Old 01-23-2013, 05:36 PM
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nitrosportsandrunner
 
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Default RE: need help with low voltage detection on esc

ORIGINAL: kyleshrub


ORIGINAL: redraceepx

I have a tornado epx pro from redcat racing, Brushless and on a paper it says that the esc can handle a 7.2vnimh, 8.4vnimh, and a 7.4lipo. So i bought a 8.4v and put it in, low voltage detection turned on. can anybody help to stop this
Sounds to me like you have the ESC set to ''lipo mode,'' or it wouldn't detect low voltage. Refer to your user manual on how to turn it off, since you're using a nimh.
There is a way to disable the low voltage detection (lipo mode)
But without the ezrun program card is a huge pain.
Also, at best you will only get an extra minute or so of runtime by doing this. the low voltage detection cuts power when the battery voltage dips below 6.2v. Much lower than that and the nimh battery wont be able to move the truck at speed anyway.
Whats the MAH rating of your 8.4v battery?
Here is the program card: http://www.ebay.com/itm/Hobbywing-LE...item43b1631c18
and here is the ezrun manual: http://site.hobbypartz.com/hobbywing/HW-13-V2.pdf
Old 01-23-2013, 06:27 PM
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kyleshrub
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Default RE: need help with low voltage detection on esc


ORIGINAL: nitrosportsandrunner

ORIGINAL: kyleshrub


ORIGINAL: redraceepx

I have a tornado epx pro from redcat racing, Brushless and on a paper it says that the esc can handle a 7.2vnimh, 8.4vnimh, and a 7.4lipo. So i bought a 8.4v and put it in, low voltage detection turned on. can anybody help to stop this
Sounds to me like you have the ESC set to ''lipo mode,'' or it wouldn't detect low voltage. Refer to your user manual on how to turn it off, since you're using a nimh.
There is a way to disable the low voltage detection (lipo mode)
But without the ezrun program card is a huge pain.
Also, at best you will only get an extra minute or so of runtime by doing this. the low voltage detection cuts power when the battery voltage dips below 6.2v. Much lower than that and the nimh battery wont be able to move the truck at speed anyway.
Whats the MAH rating of your 8.4v battery?
Here is the program card: http://www.ebay.com/itm/Hobbywing-LE...item43b1631c18
and here is the ezrun manual: http://site.hobbypartz.com/hobbywing/HW-13-V2.pdf
NIMH batteries, unlike LiPOs, can be run well below 6.2v. In fact, they can be run until the pack is completely dead, and do so with no harm to the battery.
If every NiMH user quit driving their RCs when a LVC (low voltage cutoff) kicked in, they'd lose 50% or more of their runtime.

My advice to the original poster would be to not try and run a brushless system off a NiMH battery, as the LVC kicking in will be but one of your problems.
Get a LiPO, and good luck.

Old 01-24-2013, 03:12 PM
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nitrosportsandrunner
 
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Default RE: need help with low voltage detection on esc

ORIGINAL: kyleshrub


ORIGINAL: nitrosportsandrunner

ORIGINAL: kyleshrub


ORIGINAL: redraceepx

I have a tornado epx pro from redcat racing, Brushless and on a paper it says that the esc can handle a 7.2vnimh, 8.4vnimh, and a 7.4lipo. So i bought a 8.4v and put it in, low voltage detection turned on. can anybody help to stop this
Sounds to me like you have the ESC set to ''lipo mode,'' or it wouldn't detect low voltage. Refer to your user manual on how to turn it off, since you're using a nimh.
There is a way to disable the low voltage detection (lipo mode)
But without the ezrun program card is a huge pain.
Also, at best you will only get an extra minute or so of runtime by doing this. the low voltage detection cuts power when the battery voltage dips below 6.2v. Much lower than that and the nimh battery wont be able to move the truck at speed anyway.
Whats the MAH rating of your 8.4v battery?
Here is the program card: http://www.ebay.com/itm/Hobbywing-LE...item43b1631c18
and here is the ezrun manual: http://site.hobbypartz.com/hobbywing/HW-13-V2.pdf
NIMH batteries, unlike LiPOs, can be run well below 6.2v. In fact, they can be run until the pack is completely dead, and do so with no harm to the battery.
If every NiMH user quit driving their RCs when a LVC (low voltage cutoff) kicked in, they'd lose 50% or more of their runtime.

My advice to the original poster would be to not try and run a brushless system off a NiMH battery, as the LVC kicking in will be but one of your problems.
Get a LiPO, and good luck.

Yeh, I knew that, but...
running a nimh below 6.2v on a BRUSHED setup is fine. But a brushless setup demands more amps.
You dont lose 50% of the possible runtime. At most 1-2 minutes.
After that point, the truck would be so slow there is not point in running it anymore.
If 50% of the runtime were cutoff by the LVC, then redcat wouldnt ship the trucks with LVC on.
So at most, the LVC is cutting off 10-15% of the possible runtime.
These stock 2000mah packs are not high quality race packs. Once they hit 6.2v, there aint much left in them!
Old 01-24-2013, 09:12 PM
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JoeMaxx
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Default RE: need help with low voltage detection on esc

I would email their support and ask this question because there online documentation does not help with this problem. It is a setting but they do not publish it. Might be in your manual that you received with the R/C.

[email protected]
Old 01-24-2013, 10:18 PM
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Default RE: need help with low voltage detection on esc

Humm that's strange, that it can do 6cell and 7 cell nimh and 2s lipo. But no 3s.

I've seen ESC that do 7cell and 2s only but never them and 7cell

Did the paper say that it can handle 8.4v max or a 7cell battery?

Because a fully charged 7.4v 2s lipo is 8.4v
Fully charged 7.2v 6 cell is 8.4v
Fully charged 8.4v 7 cell battery is 9.8v

So the ESC might not be limited that high or it thinks it's a flat 3s lipo

What ESC is it running? If its the ezrun esc turn off the low voltage detection
Old 01-24-2013, 10:24 PM
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Default RE: need help with low voltage detection on esc

here is a link to the Hobby Wing EZrun ESC manual.

check page 3 it has the direstion on how to turn it off

well providing its using the EZrun ESC

[link]http://www.hobbyhot.com/hobbywing/hobbywing_manuals/HW-13-V2.pdf[/link]
Old 01-24-2013, 10:40 PM
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Default RE: need help with low voltage detection on esc

ORIGINAL: phmaximus

Humm that's strange, that it can do 6cell and 7 cell nimh and 2s lipo. But no 3s.

I've seen ESC that do 7cell and 2s only but never them and 7cell

Did the paper say that it can handle 8.4v max or a 7cell battery?

Because a fully charged 7.4v 2s lipo is 8.4v
Fully charged 7.2v 6 cell is 8.4v
Fully charged 8.4v 7 cell battery is 9.8v

So the ESC might not be limited that high or it thinks it's a flat 3s lipo

What ESC is it running? If its the ezrun esc turn off the low voltage detection
that is definitely the issue seen so many people with the same issue with BL setups, and 7cell batteries.
Old 01-25-2013, 08:16 AM
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Default RE: need help with low voltage detection on esc


ORIGINAL: phmaximus

Humm that's strange, that it can do 6cell and 7 cell nimh and 2s lipo. But no 3s.

I've seen ESC that do 7cell and 2s only but never them and 7cell

Did the paper say that it can handle 8.4v max or a 7cell battery?

Because a fully charged 7.4v 2s lipo is 8.4v
Fully charged 7.2v 6 cell is 8.4v
Fully charged 8.4v 7 cell battery is 9.8v

So the ESC might not be limited that high or it thinks it's a flat 3s lipo

What ESC is it running? If its the ezrun esc turn off the low voltage detection
Its a ezrun s-10. Variant of the 35a system.
It can handle 3s, but not out of the box as the fan is powered off the ESC and will be burnt out if you run 3s. Youd have to power the fan off the rx if you want to run 3s.
Not sure why the 7cell is giving him LVC issues. Unless the LVC on the esc is defective.
Or possible, the connectors. A fualty battery or esc plug will make the esc think the battery is LV.
Old 01-25-2013, 08:43 AM
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Default RE: need help with low voltage detection on esc

ORIGINAL: nitrosportsandrunner


ORIGINAL: phmaximus

Humm that's strange, that it can do 6cell and 7 cell nimh and 2s lipo. But no 3s.

I've seen ESC that do 7cell and 2s only but never them and 7cell

Did the paper say that it can handle 8.4v max or a 7cell battery?

Because a fully charged 7.4v 2s lipo is 8.4v
Fully charged 7.2v 6 cell is 8.4v
Fully charged 8.4v 7 cell battery is 9.8v

So the ESC might not be limited that high or it thinks it's a flat 3s lipo

What ESC is it running? If its the ezrun esc turn off the low voltage detection
Its a ezrun s-10. Variant of the 35a system.
It can handle 3s, but not out of the box as the fan is powered off the ESC and will be burnt out if you run 3s. Youd have to power the fan off the rx if you want to run 3s.
Not sure why the 7cell is giving him LVC issues. Unless the LVC on the esc is defective.
Or possible, the connectors. A fualty battery or esc plug will make the esc think the battery is LV.
the LVC I'm guessing is set to 3.2v per cell(I think that is default from HW on their ESC's) if the battery is detected as a 3S(which it will be with the LVC on) 9.6 volts would be the cutoff. A 7cell NiMh battery like phax said fully charged is 9.8V any draw on a NiMh is definately going to drop it .2v so the ESC is kicking in the LVC cause more then likely its dipping below the 9.6 cutoff for 3S lipos.
Old 01-25-2013, 08:48 AM
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Default RE: need help with low voltage detection on esc


ORIGINAL: SyCo_VeNoM

ORIGINAL: nitrosportsandrunner


ORIGINAL: phmaximus

Humm that's strange, that it can do 6cell and 7 cell nimh and 2s lipo. But no 3s.

I've seen ESC that do 7cell and 2s only but never them and 7cell

Did the paper say that it can handle 8.4v max or a 7cell battery?

Because a fully charged 7.4v 2s lipo is 8.4v
Fully charged 7.2v 6 cell is 8.4v
Fully charged 8.4v 7 cell battery is 9.8v

So the ESC might not be limited that high or it thinks it's a flat 3s lipo

What ESC is it running? If its the ezrun esc turn off the low voltage detection
Its a ezrun s-10. Variant of the 35a system.
It can handle 3s, but not out of the box as the fan is powered off the ESC and will be burnt out if you run 3s. Youd have to power the fan off the rx if you want to run 3s.
Not sure why the 7cell is giving him LVC issues. Unless the LVC on the esc is defective.
Or possible, the connectors. A fualty battery or esc plug will make the esc think the battery is LV.
the LVC I'm guessing is set to 3.2v per cell(I think that is default from HW on their ESC's) if the battery is detected as a 3S(which it will be with the LVC on) 9.6 volts would be the cutoff. A 7cell NiMh battery like phax said fully charged is 9.8V any draw on a NiMh is definately going to drop it .2v so the ESC is kicking in the LVC cause more then likely its dipping below the 9.6 cutoff for 3S lipos.
thanks I missed that syco, I mean that the 8.4v battery could be 9.6 fully charged...causing the esc to see it as a 3s lipo.
I guess the only option is to turn of the lvd on the esc.
Id buy the program card tho. That $13 is well worth the frustration of trying to change settings listing and counting beeps[:'(]
Old 01-25-2013, 09:15 AM
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Default RE: need help with low voltage detection on esc


ORIGINAL: nitrosportsandrunner


ORIGINAL: SyCo_VeNoM

ORIGINAL: nitrosportsandrunner


ORIGINAL: phmaximus

Humm that's strange, that it can do 6cell and 7 cell nimh and 2s lipo. But no 3s.

I've seen ESC that do 7cell and 2s only but never them and 7cell

Did the paper say that it can handle 8.4v max or a 7cell battery?

Because a fully charged 7.4v 2s lipo is 8.4v
Fully charged 7.2v 6 cell is 8.4v
Fully charged 8.4v 7 cell battery is 9.8v

So the ESC might not be limited that high or it thinks it's a flat 3s lipo

What ESC is it running? If its the ezrun esc turn off the low voltage detection
Its a ezrun s-10. Variant of the 35a system.
It can handle 3s, but not out of the box as the fan is powered off the ESC and will be burnt out if you run 3s. Youd have to power the fan off the rx if you want to run 3s.
Not sure why the 7cell is giving him LVC issues. Unless the LVC on the esc is defective.
Or possible, the connectors. A fualty battery or esc plug will make the esc think the battery is LV.
the LVC I'm guessing is set to 3.2v per cell(I think that is default from HW on their ESC's) if the battery is detected as a 3S(which it will be with the LVC on) 9.6 volts would be the cutoff. A 7cell NiMh battery like phax said fully charged is 9.8V any draw on a NiMh is definately going to drop it .2v so the ESC is kicking in the LVC cause more then likely its dipping below the 9.6 cutoff for 3S lipos.
thanks I missed that syco, I mean that the 8.4v battery could be 9.6 fully charged...causing the esc to see it as a 3s lipo.
I guess the only option is to turn of the lvd on the esc.
Id buy the program card tho. That $13 is well worth the frustration of trying to change settings listing and counting beeps[:'(]
no argument there I can't stand listening to the damn beeps. Don't know why redcat don't just include them with the models.
Old 01-25-2013, 09:19 AM
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Default RE: need help with low voltage detection on esc

yeh, i emailed them once about that.
wish they would, but it would be a bit of work (changing stuff at the factory) plus a price increase.

at least the cards dont cost that much. just wish hobbypartz would keep them in stock.
Old 01-25-2013, 09:20 AM
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Default RE: need help with low voltage detection on esc


ORIGINAL: nitrosportsandrunner

yeh, i emailed them once about that.
wish they would, but it would be a bit of work (changing stuff at the factory) plus a price increase.

at least the cards dont cost that much. just wish hobbypartz would keep them in stock.
I say that about 95% of the stuff they list [&:]
Old 01-25-2013, 12:35 PM
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Default RE: need help with low voltage detection on esc


ORIGINAL: nitrosportsandrunner


ORIGINAL: phmaximus

Humm that's strange, that it can do 6cell and 7 cell nimh and 2s lipo. But no 3s.

I've seen ESC that do 7cell and 2s only but never them and 7cell

Did the paper say that it can handle 8.4v max or a 7cell battery?

Because a fully charged 7.4v 2s lipo is 8.4v
Fully charged 7.2v 6 cell is 8.4v
Fully charged 8.4v 7 cell battery is 9.8v

So the ESC might not be limited that high or it thinks it's a flat 3s lipo

What ESC is it running? If its the ezrun esc turn off the low voltage detection
Its a ezrun s-10. Variant of the 35a system.
It can handle 3s, but not out of the box as the fan is powered off the ESC and will be burnt out if you run 3s. Youd have to power the fan off the rx if you want to run 3s.
Not sure why the 7cell is giving him LVC issues. Unless the LVC on the esc is defective.
Or possible, the connectors. A fualty battery or esc plug will make the esc think the battery is LV.
Most guys just move the positive fan wire to the BEC then u don't have to worry about the fan.

I don't think the ESC if defective at all, it just thinks that's the 7cell is a 3s lipo
Old 01-27-2013, 10:19 AM
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redraceepx
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Default RE: need help with low voltage detection on esc


thank you
Old 04-28-2014, 12:39 AM
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Hi all I have a 35A HobbyWing ESC it is cutting off (LVC) so i need to know how to disable LVC as im using NIMH batteries
Can someone direct me to the step by step guide


I have a Programe Card just need to know what needs to be in the ITEM and what needs to be in the VALUE box

Someone told me to do this


Press the item button till the item # says 3
then press the value button till value says 1


But that did not work it is still doing LVC can someone help..

Thanks
Old 04-28-2014, 01:01 AM
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senanchamma
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Here is what ive done as a video i hope some one can help

https://www.youtube.com/watch?v=kiiS...ature=youtu.be

https://www.youtube.com/watch?v=kiiSvlJhyro&feature=youtu.be

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