What's going on here?

[68_f100]

Overloading the BEC?

http://vid374.photobucket.com/albums...pskxuixqqf.mp4

[scalemadness]

Definitely a power surge going on do you have a separate bec and is it wired to the receiver or direct to your servo?

[68_f100]

Originally Posted by scalemadness

Definitely a power surge going on do you have a separate bec and is it wired to the receiver or direct to your servo?

straight to the rx. its set at 7.4v with the cc software. 2s lipo powering the system.

[scalemadness]

Red wire from the esc is pulled? Sorry have to ask if so i would try feeding your servo direct from the bec and feed the reciever from the esc and see if the issue resolves

[68_f100]

I won't know for sure until I can get it to the shop tomorrow and test some things. I am betting it is a bad servo pulling too many amps. The green light on the BEC does flash when the power cuts out but the rx stays orange all the time like it doesn't lose power.

[68_f100]

Originally Posted by scalemadness

Red wire from the esc is pulled? Sorry have to ask if so i would try feeding your servo direct from the bec and feed the reciever from the esc and see if the issue resolves

Yeah red wire is pulled from esc.

[scalemadness]

It is a possibility too of a bec issue but id probably try another servo out if you have one to test first

[68_f100]

Originally Posted by scalemadness

It is a possibility too of a bec issue but id probably try another servo out if you have one to test first

Swapped the bec from another rig and same issue. The servo is a 7990th and I don't have anything else that big to test with at home.

[scalemadness]

Your servo being the culprit is probably your best bet then gotta hate the electrical gremlins

[EeePee]

Turn the BEC down to 6 volts and see what happens. As volts go up, amps go down.

[68_f100]

Originally Posted by EeePee

Turn the BEC down to 6 volts and see what happens. As volts go up, amps go down.

Guess it's time to find a bigger bec.

[altd896]

How charged is the battery?

You've got a BEC set to 7.4V & what is in theory only a 7.4V battery (I know charged they're more) but the BEC can't make voltage only loose it.
Once the input voltage is below the required output all it can do is pass through whatever the input is.
If your battery is down to 7.0V already the BEC can't make that up.

[68_f100]

Originally Posted by altd896

How charged is the battery?

You've got a BEC set to 7.4V & what is in theory only a 7.4V battery (I know charged they're more) but the BEC can't make voltage only loose it.
Once the input voltage is below the required output all it can do is pass through whatever the input is.
If your battery is down to 7.0V already the BEC can't make that up.

This is true but the servo is rated to run 6.0-7.4 volts so even if the voltage drops the servo should still function normally until it dropped below 6.0v.

[altd896]

Its more about how much current the servo draws & how much is available from the battery for the BEC to pump through, yes it will work at 6v but I think it'll draw more current trying not to stall, current that's not available if the battery is already on it's way down.

[Olle P]

Originally Posted by 68_f100

This is true but the servo is rated to run 6.0-7.4 volts...

But what about the Rx? Is it rated to run at as high as 7.4V?
If it is, why not just drop the BEC and feed servo and Rx straight from the battery? (If it's rated for 7.4V it means "will function when fed straight from a 7.4V battery".)

[68_f100]

Originally Posted by Olle P

But what about the Rx? Is it rated to run at as high as 7.4V?
If it is, why not just drop the BEC and feed servo and Rx straight from the battery? (If it's rated for 7.4V it means "will function when fed straight from a 7.4V battery".)

A fully charged lipo is 8.4 for a little while. I am not sure the rx is rated that high. I guess I could go look it up.

[Olle P]

Any rating for this type of electronics refer to nominal battery voltage for the unregulated battery used to feed it. If it's rated for "7.4V" it's designed to be fed straight from a 7.4V battery (@ up to 8.4V).
(You don't use any BEC in combustion motor models!)