burn ccbec ?

[Jason]

last night I was tempted to use my airtronics 2.4ghz radio on my truggy and all is looked fine the mamba max red wire are disconnected.. I connected the mamba esc on throttle slot and the servo into the steering slot .. now the bec I was connected it to the battery slot on the receiver... all worked good for around 20sec then the bec have stopped working I touch it and it was HOT now the I think the bec was burn ... I used 12 cells in series to startup up the receiver and bec...

there is the the manual of my radio ...

www.airtronics.net/manual/MX-3FHSS.pdf

I have see the receiver a NONE BEC integrated maybe why the problem ?

[BrianG]

I'm not sure, but I think "none BEC" just means there is no BEC in the receiver itself. Even if it meant the receiver is not BEC-compatible, the way you had it hooked up is fine (BEC in battery slot).

I can think of several reasons why the BEC got hot, in order of probability.:

- Servo overload. If a servo was stalled (like steering trying to move beyond the mechanical limits), it can pull quite a bit of current.

- You hooked the BEC input to only one of the battery packs and used the wrong one. Most ESCs (if not all) have a common ground connection between the negative battery pack connection and the throttle ground connection. If the BEC input was hooked to the wrong single pack, the ground was actually at 1/2 the battery voltage.

- Defect in the BEC itself.

- Reverse polarity on the BEC input. I don't believe this is the case as it wouldn't work at all if this happened.

[Jason]

hmm when I plug it again the green led dont going ON and the BEC get HOT

I tried to plug it into my computer via castle link usb and my sofware dont detect it...

[BrianG]

Well, it is obviously permanently damaged so you'll need to contact Castle. Before you get a new one, I would go over the wiring and check your servos so that the next BEC won't fry as well.

[emaxxnitro]

just send it in, they will send you another one out. no need to call

[Jason]

ok I will sent it out to castle

[jayjay283]

I use that radio system and have used it with a MM/ CC bec/4s lipo/1515 1y for months. The receiver just has no bec and you must be sure not to set your bec for over 6v as anymore and the receiver frys (dunno why, probably why they quit making them lol) Just thought id share, Brian has it covered as usual.

[Jason]

jayjay ok so I put 6v setting for the bec via castle link usb computer software and does the bec connect to the battery slot or aux on this receiver ?

[jayjay283]

yeah I just set it at 6v, plugged the bec into the receiver (batt slot) make sure of + & - and good to go. If no lights its fried... You don't NEED a bec to run 12 cells on the MM, sure it would run cooler but try it without it ?

[BrianG]

I hate to disagree, but I will. 12 cells with a very conservative 0.5A load will force the MM's linear BEC to dissipate 4.2w of power. Let's not forget the MM's BEC is enclosed with no heatsinking. It'll work for a while, but why risk it? I would use a receiver pack instead if I had to.

[jayjay283]

wow, that would get hot. Just buy a MMM !

[Jason]

I use a four AA battery holder for now I have just connected it into the battery slot on the receiver work fine... not sure if this can last for some pack without the need of recharging.. and if the battery ( AA ) get very low do I can lost control of my rc since it power the receiver & servo?

[BrianG]

Most ESCs are set up to not do anything if it doesn't receive a signal from the receiver. So, if your Rx battery pack gets too low, you might get some erratic behavior (especially when turning which causes the voltage to dip lower momentarily) before the system just stops. It should not turn into a runaway like a nitro though.

[Jason]

ok cool I use the mamba max 1/10 esc I think it have a protection for this...

[Jason]

how much time you think 2000+ mah four AA will last as receiver pack ?