You are right about the BEC and the ability to setup the controllers
in any fashion.
--- In mach1mach2cnc@..., Hugh Prescott <hugh345@...>
wrote:
> Do the RC motor controllers use 1mS as off and 2ms full
throttle, or
> 1.5mS is
> off, 2mS is full throttle, and 1mS is full reverse.
The transmitters can be set either way to match up with the speed
controller. I have never seen a standard published so you should
probabbly design for either.
Some do not have reverse and use the full span for forward, most
are
adjustable by using the ESC programing function built into most of
the
new ones.
> As I understand, a connection to the servo , or motor controller
is
by a 3
> wire connector, Gnd, +5V and the control signal. For the motor
> controllers,
> how much current does the +5V connector draw? For a standard
servo,
the +5V
> supplies the servo power. For a motor controller, my guess is
that it
> supplies
> only a reference or just small amount for the logic circuitry.
Every speed controller I have tested or serviced has SUPPLIED 5 - 6
volts on the +5 wire to run the receiver and other servos. This
feature
is called a BEC (Battery Elimnator Circut). Amp capacity ranges up
to 1
amp on some of the new ESCs.
You do not need to (you may damage the ESC or BEC circut if you do)
provide 5 volts to the ESC on the control cable just ground and the
standard control signal.
On our bench testers (my design, not commercially available) at
work (we
own a large hobby shop that does lots of repair work) I installed a
separate lead for testing ESC's that does not provide 5 volts but
instead applies a variable load and displays the BEC output voltage.
Servo output pulse is a standard 5 volt pulse of 1 - 2 MS occuring
every
16 MS.
Hugh
