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HomeRC & PowerAircraftHelicopterFlybarless Rotor Head SystemsFutaba CGY › Servos work with battery but not with ESC/BEC
10-28-2013 04:36 AM  4 years agoPost 1
A.J.

rrVeteran

Bethlehem, GA

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Hey guys,
Let me see if I can explain my problem. I have set up many CGY750s but I have never encountered this before.

I am converting my stock Trex 450 pro to flybarless with a CGY750. All the servos are the stock DS410's and it has the stock align ESC/BEC. I have a Futaba radio and R6203SBE.

Ok, here is the problem. When I power the radio gear with a standard 4.8v NiCd battery everything works fine. All the servos move they way they should. When I power the radio gear with a 3S lipo connected to the ESC/BEC which provides 6v to the radio gear, the elevator servo will not work. It moves freely as there is no power to it. Sometimes it will be the elevator and aileron servo that doesn't work but most of the time its just the elevator servo.

I don't see what the difference is between the 2 power sources except the voltage. Any ideas on what the problem is?

Thanks,
A.J.

Stratus 90, Synergy E6, Trex 450 Pro

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10-28-2013 09:55 AM  4 years agoPost 2
Flying Brian

rrElite Veteran

St. Clairsville, Ohio

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Sounds like your having a voltage issue. Is your 3S properly charging?

Double check that your BEC is properly working as well.

"I just don't Listen" "

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10-28-2013 12:37 PM  4 years agoPost 3
garyl

rrVeteran

taxachussetts

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I had this same issue and it was the BEC not able to handle the start up surge current so the 750 would not boot properly. How many amps is the BEC rated for?

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10-28-2013 02:40 PM  4 years agoPost 4
Ronald Thomas

rrMaster

Gainesville, Fl, USA

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The Align BEC will be good with the stock stuff but not when you add more powerful FBL units as well. Do an external BEC…a good one..

Team MikadoUSA 480XXTreme, 550SX, 600SX, 700XXTreme, 800XXTreme!!

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10-28-2013 07:58 PM  4 years agoPost 5
A.J.

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Bethlehem, GA

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Well, I did a little more playing around last night and found that if I re-arranged the servo hook ups the same servo did not move. Also I tried a servo I had laying around and it did work. So I am going to start by getting new servos and see if that works.

Stratus 90, Synergy E6, Trex 450 Pro

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10-29-2013 05:48 AM  4 years agoPost 6
jschenck

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La Vista, NE.

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I had this same issue and it was the BEC not able to handle the start up surge current so the 750 would not boot properly.
I've seen something like that also - before buying new servos I'd suggest an external BEC. Shouldn't need anything too big or expensive for a 450. Or possibly a different ESC with a bigger BEC - CC Talon 35 comes to mind though I haven't tried one yet.

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10-29-2013 09:58 AM  4 years agoPost 7
Joe90

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Quebec, Canada

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I go with you guy, I have seen this often.
especially using programming cards on esc.
The bec is not working sufficiently well.
you prove that your servos and gy750 are working well by using a 4.8v. batt.

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11-02-2013 08:36 PM  4 years agoPost 8
A.J.

rrVeteran

Bethlehem, GA

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Yeah, you guys were right. It was not the servos.

So what size BEC should I have? I have noticed that I have an older align ESC which has a 2A BEC. The newer ones have 3A BEC.

Stratus 90, Synergy E6, Trex 450 Pro

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11-03-2013 01:30 AM  4 years agoPost 9
Ronald Thomas

rrMaster

Gainesville, Fl, USA

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At least 5 amp continuous but 10 is what I would go with.

Team MikadoUSA 480XXTreme, 550SX, 600SX, 700XXTreme, 800XXTreme!!

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11-03-2013 01:36 AM  4 years agoPost 10
Flying Brian

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St. Clairsville, Ohio

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Let's regress a bit. How is your program set up in your radio? Are you using H-1?

"I just don't Listen" "

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11-03-2013 04:20 AM  4 years agoPost 11
A.J.

rrVeteran

Bethlehem, GA

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Let's regress a bit. How is your program set up in your radio? Are you using H-1?
That is definitely not the issue.

Going to try a different ESC/BEC

Stratus 90, Synergy E6, Trex 450 Pro

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11-04-2013 12:36 AM  4 years agoPost 12
dkshema

rrMaster

Cedar Rapids, IA

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Try a CC Talon 35. Enough current for the motor and the BEC can supply ample power.

-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz

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11-04-2013 01:23 AM  4 years agoPost 13
A.J.

rrVeteran

Bethlehem, GA

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Yeah I am leaning towards the talon 35 right now.

Stratus 90, Synergy E6, Trex 450 Pro

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11-24-2013 03:49 PM  4 years agoPost 14
A.J.

rrVeteran

Bethlehem, GA

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Finally got a new esc. I got the Talon 35. It has a 5A bec with 7A peak. And its still doing the same exact thing. It only powers 1 servo with the esc/bec and all 3 are powered when I connect a almost dead 4.8v nicd battery. Also I have an old e-flite 25amp POS speed controller from a Blade 400 and it powers everything just fine. And that has a far smaller bec than the castle does. I am completely confused at this point.

Stratus 90, Synergy E6, Trex 450 Pro

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11-24-2013 03:59 PM  4 years agoPost 15
Ronald Thomas

rrMaster

Gainesville, Fl, USA

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Do an external BEC…a good one..
Western Robotics

Team MikadoUSA 480XXTreme, 550SX, 600SX, 700XXTreme, 800XXTreme!!

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11-24-2013 07:33 PM  4 years agoPost 16
dkshema

rrMaster

Cedar Rapids, IA

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With a 5 amp continuous rating, the Talon 35's ESC ought to provide plenty of juice without having to spend another boatload of dollars. No need to dump money into yet another regulator.

Post some good clear pictures of what you have, we'll figure out your problem.

-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz

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11-25-2013 12:06 AM  4 years agoPost 17
A.J.

rrVeteran

Bethlehem, GA

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Ok, I did some more testing/experimenting. This might be a little hard to follow so let me try to set this up. I have 2 helis with CGY750s. The problem is the 450.

Trex 450pro
-3x DS430M cyclic servos
-Castle Talon 35 ESC
-Futaba R6203SBE Rx
-CGY750

Synergy E6
-3 DS615 cyclic servos
-Castle BEC Pro (20amp)
-Futaba R6008SB Rx
-CGY750

First test - I plugged the Talon 35 and R6203SBE into the CGY750 that is mounted in the E6 with the DS615 servos still connected. Everything powered up perfectly.

Second test - I plugged the Talon 35 and R6203SBE into the CGY750 mounted on the trex450 and plugged the DS615 servos into the trex's cgy750. Everything worked perfectly.

So after these 2 test, the Talon 35's BEC has enough power to start up a CGY750 with full size DS615 servos. It should have enough to power DS430 micro servos.

Third test - I plugged the Talon 35 and R6203SBE into the CGY750 on the E6 and plugged the DS430 servos from the trex450 into it. Same issue exists. Only the front right cyclic servo is powered.

Fourth test - The E6 is out of the picture on this test. The Talon 35 and R6203SBE is connected to the CGY750 on the Trex450 and the DS430's are connected as well. Only one servo is powered, the front right cyclic servo. Now I change the cyclic servos around and plug them into different spots on the CGY750. Only 1 servos gets power and it surprisingly the same front right servo. Once powered up and the one servo moves, if I unplug and plug back in the servos that are not powered everything works fine.

The problem seems to be with the micro align servos. Both my stock DS410 servos and the DS430 which replaced the stock servos seem to produce the same result.

Stratus 90, Synergy E6, Trex 450 Pro

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11-25-2013 01:42 AM  4 years agoPost 18
BobOD

rrElite Veteran

New York- USA

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Yes, of course 5 amps is enough to power up a 450 control.

The problem is the initialization of the servo. By unplugging the servos and plugging them back in you've verified this. It's not a new problem BTW, been seen with other gyros too.

It seems to be a combination of the startup sequence of the controller and the boot up of the servo not being compatible so becomes a question of who's at fault.

What firmware do you have in the 750?

Team POP Secret

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11-25-2013 02:32 PM  4 years agoPost 19
A.J.

rrVeteran

Bethlehem, GA

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The firmware version is 1.31 on the cgy750

Stratus 90, Synergy E6, Trex 450 Pro

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11-25-2013 03:16 PM  4 years agoPost 20
Ronald Thomas

rrMaster

Gainesville, Fl, USA

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A battery will make it work properly because it has enough reserve to power up the servos and electronics when they need that large pull on start up (micro Align servos that you verified). Unless one servo is faulty, the issue is too much pull on the BEC on start up.......do you need me to send you a WR to try out?

Team MikadoUSA 480XXTreme, 550SX, 600SX, 700XXTreme, 800XXTreme!!

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HomeRC & PowerAircraftHelicopterFlybarless Rotor Head SystemsFutaba CGY › Servos work with battery but not with ESC/BEC
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