s 9252 voltage

[palmsprings]

I just put a set of (3) 9252 servo's on cyclic for my 600 t rex I'm running a 1900 mah 7.4 volt reciever,bec pack do I need to step down the voltage to the 9252 servo's :arggg: thanks.

[DavidH]

The 9252's will handle the voltage. The BEC should only be supplying about 5.7 to 6 volts to the receiver. You might need to step down the voltage for the tail servo depending on what servo your using.

David

[palmsprings]

davidh, I was concerned that 6 volts was to high for these servo's as they are rated at 4.8 volts the bec only steps down the voltage to 5.7 I'm using a 9256 with gy 611 with a voltage reducer suppled with 600 for tail servo. thanks

[DavidH]

Palm,
A fully charged 4.8 volt nicad or nimh pack will supply up to 5.7 volts the first couple of flights. I know several pilots that have used the 9252's on regulated 6 volts. Know a couple that have used them with a non regulated 5 cell nicad pack. That is supplying the servos with 7 volts when battery is fully charged.

Tail servo is the only one to be concerned with.

David

[palmsprings]

davidh,I dont know if it matters but I'm using a 2 cell 1900 mah 7.4 volt lipo pack. and thanks for the help! it's much appreciated.

[BarracudaHockey]

They key is the BEC provides a regulated voltage, its the unregulated 5 cell packs that can burn up 4.8v rated servos.

[DavidH]

I thought when using a BEC that a separate receiver battery did not have to be used?
Doesn't the BEC plug directly into the receiver and the BEC gets supplied power from the flight battery?


David

[SteveL]

BEC=Regulator
Andy they were referring to a 600 so the speedy does not have a BEC.

[DebianDog]

A Trex 600 comes with a BEC and a step down for the tail servo.
http://www.deeteeenterprises.com/NS.T.Rex.600.BEC.3.Amp.php

[BarracudaHockey]

I was concerned that 6 volts was to high for these servo's as they are rated at 4.8 volts the bec only steps down the voltage to 5.7

I was referencing this statement.

[DavidH]

Steve,
Thanks, I knew some of what he was describing sounded like it would be a regulator. But he just kept saying BEC.
BEC = Battery Eliminator Circuit ( No separate battery for RX, power comes from flight battery)

Regulator = Voltage Reducing device :mrgreen:

David

[SteveL]

DD that is a misnomer by Align. David is correct if it uses a separate pack it cannot be a battery eliminator circuit.

[DebianDog]

Oh I think I understand it is "technically" not correct but that is what everyone has been calling it or devices like it (not just Align) So.... what are you gonna do?

I was pretty sure a BEC was supposed to cut power to the motor/drive in order to keep the servos/radios working in a low voltage situation. Right?

[SteveL]

Yes BEC is usually referred to one built into a speed controller. The other ones like Medusa (switching) BECs are meant to hook to your main flight pack. Align's is a linear regulator and that is what had David confused. They all do the same thing. I run 9252s on regulated 6volts and have only had one problem.
When I tied my blades down to my tail boom without turning off my heli. I let the secret Futaba smoke out of one of my 9252s

[DebianDog]

dang magic smoke! It hates being in the wires :lol:

[DavidH]

Steve,
I didn't know Align or others were calling them BEC, when really they are just regulators or steps downs.

Dog,

Yes all the BEC's I am familar with that is the way they worked.

David

[Pinecone]

It sort of started with the UBEC, so many people call them BECs, even when they are used as purely a regulator.

Just a term, they all do the same thing, take a higher voltage power source and output the proper voltage for your electronics.

It would be nice if the electronics people got with the program and brought out Rxes and servos that would run native off of 2S or 3S lipos. :)

Jim Drew of XPS has talked about doing so. :)