A question about mulitple esc's on a multirotor - RC Groups
Shop our Airplanes Products Drone Products Sales
Thread Tools
May 09, 2012, 08:26 PM
Suspended Account

A question about mulitple esc's on a multirotor

If I have 4 esc's connected to a quad board and each esc is rated for 2 amps, will the maximum amperage delivered be 8 amps or at least more than 2?
The reason I am asking is that when I was running all 4 esc's into the board it was working fine.
But I was told to run a ubec instead so I went with a 3 amp 5v ubec. Now, intermittently, I get a total "power out" situation to all 4 motors
I'm flying this with a DX7 and 7010 RX.
The esc's are rc timer 30amp programmable and 2212/850kv motors. Any ideas?
Sign up now
to remove ads between posts
May 09, 2012, 10:01 PM
Registered User
Wintr's Avatar
I assume you mean the BEC in each ESC is rated for 2 amps? Normally, that type BEC doesn't share well with others, which is why a separate BEC was recommended.

Did you disable the BEC output from each ESC before installing the external BEC? If not, there could be an overheating condition, and they all overheat and shut down.

Is the BEC you installed a switching type? If not, and you are using 3S or higher battery voltage, that would also explain the power shutting off.
May 09, 2012, 10:11 PM
Suspended Account
I plugged in only the signal wires before installing the ubec. And the ubec is not a switching type.
It's this one.
May 09, 2012, 11:19 PM
Registered User
Wintr's Avatar
So, only the ground and signal wires connected, with the center red wire turned back? Or, only the signal wires? If you only connected the one signal wire, without the ground, it wouldn't take much noise in the ESCs to confuse the controller chips.

It appears that the data sheet in the first photo on that site does say it is a switch mode BEC. Did you get the same data sheet?
May 10, 2012, 12:24 AM
Suspended Account
Yes I only connected the signal wires without the grounds. I just flipped the plugs over so that only the signals were plugged in.
The "switch" the ubec sheet refers to is a jumper that will let you do either 5 or 6 volts. I have one of these coming. It's twice the amperage.
May 10, 2012, 06:55 AM
Registered User
flypaper 2's Avatar
The first one is actually a switching ubec and should work fine, but needs the ground wire on the ESCs connected as Wintr says.
May 10, 2012, 03:34 PM
Сделайте Америку Великой Снова
7oneWo1f's Avatar
Connect the grounds as well as the signal coming from ESC.
May 10, 2012, 11:21 PM
Registered User
Wintr's Avatar
The reason you need the ground wire, too, is the input circuit of the ESC has to measure the pulse on the signal wire; without a reference ground to compare it to, except the indirect one through the battery and BEC, it could have trouble doing that.

You can extract the contact with the red wire from the connector, using a sharp blade, like an Xacto, to lift the plastic tab that holds it in. Then, just tape it back, so it won't short.
May 11, 2012, 10:38 PM
Suspended Account
Ah ok. I wasn't aware of that. Thanks for the info.

Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Discussion A question about the propellor on a Horten kleinaberfein Nurflügel 6 Apr 18, 2012 02:46 AM
Discussion Question about video recording on my new Sony Nex5n, recording in AVCHD or MP4 jasper7821 Aerial Photography 0 Apr 11, 2012 12:37 PM
Discussion Question about rctime 30amp programmable esc randall1959 Power Systems 2 Mar 11, 2012 09:26 AM
Discussion Quick Noob question about ESCs Terrier Multirotor Drone Talk 5 Mar 10, 2012 01:07 PM
Discussion Question about ESC placement. youngti Multirotor Drone Talk 1 Feb 25, 2012 04:01 AM