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T-REX 700 › Setup for separate battery using BEC on 700X
01-21-2017 06:41 AM  10 months agoPost 1
iyoy

rrVeteran

Bacolod City,​Philippines

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Hi,

I am completing assembly of my Align T-Rex 700X Super Combo which comes with Align 850MX motor, Align rebranded Hobbywing 130A ESC with built in BEC, Microbeast PLUS FBL. I am using a Futaba R7008SB setup in a standard configuration, non SBus. My batteries are two LiPo 6S 22.2V 5000 mAh 60C connected in Series for 12S. I have already bench tested this setup successfully just to confirm everything works and it does. For convenience and safety reasons, during servo installation and FBL programming, I used a LiPo 2S 7.4V 2200 mAh battery plugged into the R7008 SB battery channel.

Prior to this build, my experience in electric helis have been limited to 500 size. This is my first 700 and I wish to set it up with the separate battery for the receiver and servos. I would like to solicit the help of the forum members to make this possible.

Please make a detailed explanation on which channel should the batter plug go and where the ESC throttle wire/ plug should go.

Thank you!

iyoy

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01-21-2017 07:23 AM  10 months agoPost 2
Heli Fanatix

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Fountain Valley, CA

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The hobby wing BEC is fine.
- set BEC voltage to 6.0v
- that will make the BEC stable
- Run an opti power back up guard to be extra safe.

- Scott

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01-21-2017 08:32 AM  10 months agoPost 3
iyoy

rrVeteran

Bacolod City,​Philippines

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Helifanatix

Thanks for the quick reply! Sorry to sound naive but like I mentioned earlier, this is my first electric heli build. A 550 on 6S and a 700 on 12S that I am building at the same time. I am currently flying a 500 on 6S without a buffer pack. I have test hovered the 550 without a buffer but intend to operate it with one in the future.

To reiterate my request, I understand from doing a Google search that Optipower is a backup system and it does sound like a good idea. I will look to acquiring one for future retrofit. In the meantime, I am looking for detailed advice (for dummies if you will) on how and which ports to connect the wires and how to safely operate the system. For example, do I just plug in the buffer pack to the battery port or extra channel of the receiver? When turning on the system, after turning the transmitter on, will it matter if I plug in the buffer prior to the main battery or vice versa? Finally, what preparations do I have to perform prior to plugging in, i.e. setting BEC voltage to 6 volts like you mentioned, and how do I do that?

Thanks again!

iyoy

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01-21-2017 03:17 PM  10 months agoPost 4
Heli Fanatix

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Fountain Valley, CA

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There has been threads for this very same question. Search through the RR

- Scott

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01-23-2017 06:03 PM  10 months agoPost 5
Pistol Pete

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Seffner, FL

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I wish to set it up with the separate battery for the receiver and servos
Seems you already figured it out when I read the following:
For convenience and safety reasons, during servo installation and FBL programming, I used a LiPo 2S 7.4V 2200 mAh battery plugged into the R7008 SB battery channel.
Given the above statement, DO NOT connect the BEC output lead from ESC to anything.

You do not have to change the BEC output voltage given the 2S separate battery in place. In any event, you would need to purchase the programming box to change any default settings. Oddly enought, the manual does not state what is the default BEC voltage output...in english.

OPTIPOWER:
You can later connect it to any unused Rx channel. You first power up the Rx/servos and then the optipower and finally the ESC-Motor battery.

~~Enjoying the hobby one flight at a time~~

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01-23-2017 08:48 PM  10 months agoPost 6
Andy from Sandy

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Bedfordshire, UK

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I don't know if the HW bec has protection from another voltage source. I know the Kontroniks for example do as they state the use of a buffer pack.

So I would first remove any leads from the esc going to the fbl / receiver before connecting your setup LiPo.

The ESC is probably capable of running on 6S so you could use a single pack for setup purposes and to be extra safe move the motor away from the main gear. Always do setups with the blades off when on the bench.

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01-23-2017 08:51 PM  10 months agoPost 7
iyoy

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Bacolod City,​Philippines

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Pistol Pete

Thanks for the reply! I was able to purchase a Hobbywing programmer yesterday. I will study how to use it and will give an update on my progress. I found a manual for the ESC.

iyoy

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01-23-2017 09:35 PM  10 months agoPost 8
rcflyerheli

rrKey Veteran

Granbury, TX USA

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If you are going to run a separate 2s lipo and you have HV servos, you really don't need a separate BEC. All you need to do is remove the red wire coming out of the HW receiver plug and fold it back and tape tie or cut it off.

I've run a 2s lipo for years, using no external BEC (actually when they are stand alone outside of the ESC, they are technically called regulators). BEC nomer just got carried over to external regulators, because that is what it is a battery eliminator circuit built into an ESC so you don't have to use an external RX battery.

Hope this helps.

Goblin 700, Trex 700DFC, Gaui X7, Logo 690SX, Logo 600SX; Trex 470 Trex 500
Amain Team Rep

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01-23-2017 10:20 PM  10 months agoPost 9
DennisH

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Baton Rouge​Louisiana USA

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I use a 2s LiPo for my gyro on all of my Heli's. Only one uses the main packs vai a BEC, and I am going to change this. On my scale unit, the gyro is powered via a BEC that's tied up directly to the 44.4v side of the series battery pack.

I use a Castle ESC, so my RPM's are set directly from the Castle.

I do use a BEC on all of my units. Personally I just feel better using one. Below is a picture of the most "open" one I have. The connector that has silver on it plugs directly into the 2s battery right above it.

In this case, the power supply from the BEC goes straight to my Skookum 720, it's plugged in to the IO-A slot. I understand it can be plugged into any open slot. Just make sure the Black wire is on the bottom side.

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01-23-2017 10:43 PM  10 months agoPost 10
DennisH

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Baton Rouge​Louisiana USA

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Microbeast PLUS FBL. I am using a Futaba R7008SB setup in a standard configuration,
One of my units has a JR Receiver and a Microbeast FBL. The JR receives it's power straight from the BEC.

You can see the ESC behind the motor power leads. The 2s battery feeds the ESC, the ESC feeds the JR receiver. Then everything goes to the Microbeast.

setting BEC voltage to 6 volts like you mentioned, and how do I do that?
Most have a small switch on it, or to be safe, check it with a DVOM to make sure your getting 6v's.

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01-23-2017 10:52 PM  10 months agoPost 11
DennisH

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Baton Rouge​Louisiana USA

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I've run a 2s lipo for years, using no external BEC (actually when they are stand alone outside of the ESC, they are technically called regulators). BEC nomer just got carried over to external regulators, because that is what it is a battery eliminator circuit built into an ESC so you don't have to use an external RX battery.
Just curious, you don't use a BEC, I have always used one as I feel it gives the receiver and components a "constant" flow of 6 volts.

And I only use this 2s battery for the receiver. I have LED lights that I use a separate battery for.

Dennis

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01-23-2017 10:55 PM  10 months agoPost 12
knightofcarnage

rrElite Veteran

chicago

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Hi,
I am completing assembly of my Align T-Rex 700X Super Combo which comes with Align 850MX motor, Align rebranded Hobbywing 120A ESC with built in BEC, Microbeast PLUS FBL. I am using a Futaba R7008SB setup in a standard configuration, non SBus. My batteries are two LiPo 6S 22.2V 5000 mAh 60C connected in Series for 12S. I have already bench tested this setup successfully just to confirm everything works and it does. For convenience and safety reasons, during servo installation and FBL programming, I used a LiPo 2S 7.4V 2200 mAh battery plugged into the R7008 SB battery channel.
Prior to this build, my experience in electric helis have been limited to 500 size. This is my first 700 and I wish to set it up with the separate battery for the receiver and servos. I would like to solicit the help of the forum members to make this possible.
Please make a detailed explanation on which channel should the batter plug go and where the ESC throttle wire/ plug should go.
Thank you!
Its a 130A not 120 but why are you using a batt? Just get your self a backup system. Like Optipower ULTRA-GUARD 430 Back Up Solution Combo OPRUS2S. No reason to put a another battery you have to worry about.

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01-23-2017 11:08 PM  10 months agoPost 13
DennisH

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Baton Rouge​Louisiana USA

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I have never really studied the Optipower ULTRA-GUARD, looks like it's a great device.

I have always used 2s packs as a backup incase of a main battery failure, but this device should take care of any failure.

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01-23-2017 11:25 PM  10 months agoPost 14
knightofcarnage

rrElite Veteran

chicago

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Works great. You can also use a scorpion guard its cheaper but, personally I think the Optiguard is much better. You don't need the lights on the Optiguard , just the batt and UPS board combo.

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01-24-2017 01:08 AM  10 months agoPost 15
iyoy

rrVeteran

Bacolod City,​Philippines

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Thank you for the comments!

Helifanatix, Pistol Pete, Andy from Sandy, rcflyerheli, Dennis H, knightsofcarnage and all the guys on the forum, thanks for the help. I'm over whelmed by the response. I've been studying the manual:


and I've decided to go ahead and do the connections as described in page 3 just for some quick test flights to get things going while I study the many options for an extra battery. I am assuming this is a safe setup considering that this is what Align instructs the user to do. I like to think that I am a safe and responsible practitioner of our hobby and unless there are any violent objections then I will proceed in this manner. In the meantime, please keep the discussion alive and the comments coming. I will look at the Optipower option. I also bought the Hobbywing programmer.

Thanks!

iyoy

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01-24-2017 01:59 AM  10 months agoPost 16
DennisH

rrApprentice

Baton Rouge​Louisiana USA

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and I've decided to go ahead and do the connections as described in page 3 just for some quick test flights to get things going while I study the many options for an extra battery. I am assuming this is a safe setup considering that this is what Align instructs the user to do. I like to think that I am a safe and responsible practitioner of our hobby and unless there are any violent objections then I will proceed in this manner. In the meantime, please keep the discussion alive and the comments coming. I will look at the Optipower option. I also bought the Hobbywing programmer.
There is nothing wrong setting it up as shown on page 3.

I will admit, I am going to study up on the scorpion guard and the Optiguard.

These would really be nice in areas where there is not much room to spare,but it looks like a good all round system to get rid of the 2s battery setup.

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01-24-2017 04:02 PM  10 months agoPost 17
Heli Fanatix

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Fountain Valley, CA

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The Opti Power is the SOLUTION.
- lets you use a BEC for convenience
- redundancy of a battery backup supply
- don't have to worry about charging the 2S
- Opti Power let's you know if it had to kick in during flight
- 40 grams / about $40 for piece of mind and simple to use

* that is correct, some ESC don't like a buffer pack. The Optio power will resolve of that issue

Using a BEC with a 2S defeats the purpose. Why not just use a straight LIFE for constant 6V? Than back up that LIFE with an Opti Power?

I've known external flight packs to have gone bad
- cells rupture
- terminals loose connection
- wires break from vibration causing metal fatigue

BTW
Scorpion BUG have a tendency to puff, but better than no back up guard

- Scott

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01-24-2017 04:28 PM  10 months agoPost 18
Ace Dude

rrProfessor

USA

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I'm using a KONTRONIK ESC and a buffer pack as recommended by KONTRONIK. My buffer pack is a small 2s LiFe. It's light, easy to mount, and allows me to turn on the on-board electronics w/o connecting the flight pack. I'm using the Futaba heavy duty switch harness between the buffer pack and on-board electronics. The ESC keeps the pack charged so no need to charge it separately.

  

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01-24-2017 10:55 PM  10 months agoPost 19
rcflyerheli

rrKey Veteran

Granbury, TX USA

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Just curious, you don't use a BEC, I have always used one as I feel it gives the receiver and components a "constant" flow of 6 volts.

And I only use this 2s battery for the receiver. I have LED lights that I use a separate battery for.

Dennis
Yes, that is right, I haven't run any type of BEC or regulator except on one heli that was having back EMF issues with BK servos. I switched that one to a WR Super Hercules running off one of the two 6s packs and that resolved my issues.

All of my other helis have run a 2200 mah 2S lipo with at least two leads going into my Vbars. The servos can handle the full charges of 8.4 volts, and I switch packs after 3 flights. I've never had a pack go below 7.8 volts. My X7 runs 1300 mah packs but I change them after every two flights.

I have never felt the need to run something like the ultraguard, but I can see the benefit if I were running an ESC with a built in BEC. My feelings are that taking good care of my RX packs resolves a single point failure of my main flight packs or ESC. I've run RX packs from the old nicad/NMH era for over 45 years on planks, and just trust batteries over other types of power sources. A battery will give you advance notice it is sick, unless you damage it. Sick batteries go to my test box with a big X taped on them and only get used for testing or setup.

An ESC failure doesn't give advance warning. It works one second and is failed the next, and depending on the failure, it can take out your RX/FBL system.

I know and understand others have different opinions and I respect that. I just know what has worked for me for a long, long - long, long, long time (as Harrison Ford put it).

Goblin 700, Trex 700DFC, Gaui X7, Logo 690SX, Logo 600SX; Trex 470 Trex 500
Amain Team Rep

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