Running Two Controllers - RC Groups
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Feb 26, 2006, 09:44 PM
Registered Foam Abuser
jiggiba's Avatar

Running Two Controllers

I'm setting up a plane with two motors and controllers. I'll be using the newest CC25 controllers. Do I have to remove one power lead on one of the controllers or can i leave both BEC's connected?
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Feb 27, 2006, 12:20 AM
KC5UH transmits -------->
ham2405's Avatar
No removing wires, CC controllers are built to work in parallel.

Feb 27, 2006, 02:33 PM
"Each Day Is A Lesson"
diver don's Avatar
Just remember that you don't get twice the servo support with 2 ESC.
Bernie once said it's closer to 1.5 not 2x.

Feb 27, 2006, 02:42 PM
Registered User
pda4you's Avatar
Originally Posted by ham2405
No removing wires, CC controllers are built to work in parallel.


Check that - I was told it works with some, but not all.

The thunderbirds are a noteable exception.....

You should also be cautious (I would suspect) about combining old and new PHX 25's as their BEC's were of different ratings.

Feb 27, 2006, 02:58 PM
Castle Tech
Joe Ford's Avatar

BEC's on the T-birds can be paralleled, but they do not offer the programming functions necessary for multi-motor setups.

Feb 27, 2006, 03:13 PM
Registered User
pda4you's Avatar
BEC's on the T-birds can be paralleled
Cool, so the BEC's can be, but the controllers should not...

Same result - don't do it!

So can you take an old PHX 25 (1.5amp) and new one with 3amp and have that work?

Truthfully I have been told by others to just use one ESC anyway. Several report very good results. Might be worth a try.

Feb 27, 2006, 06:42 PM
Always right
Hovertime's Avatar
BEC circuit is a very simple voltage regulator, and does not interfere with one another, you can use them in parallel as you please, ESC age and generation does not matter. (as long as its 5V, which may change in the future)

You can also use 2 Thunderbirds for 2 motors on one plane . Phoenix line is simply a higher end esc line, which offers more features, for higher precision, which makes them better candidates for multimotor planes, helis etc.

(BTW - Thunderbirds are even used in certain planes to drive 2 motors of one esc, with great success. "Jinx" come to mind)
Feb 27, 2006, 07:32 PM
Registered Foam Abuser
jiggiba's Avatar
The reason I wanted to run both BEC's is because I'm running two seperate battery packs and figured that having two seperate hook ups would give me a "fail safe operation" excluding the RX.
They are in a Multiplex "Movie Star".
Mar 01, 2006, 01:17 PM
Castle's Chaos Corner
Bernie Wolfard's Avatar

A typical twin set up is:

• One ESC for each motor Y harnessed on the receiver, both BECS enabled.
• One large battery Y harnessed to the ESCS, keeps the same voltage to each ESC
• Change ‘Throttle Type’ to ‘Fixed’
• Change ‘Cut Off Type’ to ‘Soft Cut Off’

The goal here is to keep both motors running at the same speed and to not have one cut off completely at ‘Low Voltage Cut Off.’

Mar 01, 2006, 09:53 PM
Castle Tech
Joe Ford's Avatar
Current limiting disabled as well.
Mar 02, 2006, 08:09 PM
Registered Foam Abuser
jiggiba's Avatar
Thanks for the reply Bernie.
One of the things I want to do with this set up is to controll both motors seperatly. Program some mixing with the rudder-motors. So I don't want to run a Y for the esc hookups.

Mar 02, 2006, 08:43 PM
Registered User
I can see no info on the CC website about a phoenix 25 with 3 amp BEC.

The BEC current is still shown as 1.5 amps, in the users manual, which is the only document I can find that shows the BEC capability.

Is there really a new one? Put the data on your website!

Is it really 3 amp continuous?

Mar 02, 2006, 09:50 PM
Always right
Hovertime's Avatar
It is really out, its there, its old news already...
Manual is not up to date...
Its really 3A continuous, if you are using 4 or 5 NiMH battery pack....

You need to read up and try this new feature, called search
Mar 03, 2006, 12:43 AM
Registered User
Alas, I figure the best place to find out the real specs on a product, are at the website of the manufacturer. Which is really why I posted here, to get them to update their website after they finish moving.
Mar 03, 2006, 11:49 PM
Always right
Hovertime's Avatar
Yeah thats so true... such info is really due for some updates...

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