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T-REX 250 › 250 Pro DFC Super Combo not so super
03-04-2013 04:35 PM  5 years agoPost 1
The_Widowmaker

rrElite Veteran

Bear Valley Springs, CA

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I have an idea what the fix is for my problem already but wanted to post here to see if anyone having the same issue has found an alternate solution.

Built this for a customer and the 3GX unit resets during spool up right before lift, when the head starts taking on a load. With head still turning the swash tilts on reboot and we have been lucky that it has only tipped once. I have found a few others with this issue and it seems an external BEC was the fix. Problem is the customer purchased this as a bind and fly combo, which is suppose to work as is.

Has anyone having this problem found and ESC that does not add significant weight but has the BEC capability to fix this issue ? We tried a CC Phoenix 25 but same problem. Not really wanting to go with an external BEC because this thing is lacking in room as it is.

"I'm a Virgin.. I'm just not very good at it. "

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03-05-2013 04:10 AM  5 years agoPost 2
jschenck

rrProfessor

La Vista, NE.

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I've read the YG-18 works well.

Are you running the 3.0 firmware on the 3GX? I ran 2.1 and left it that way because the 3.0 works the servos harder and may cause shutdowns, so I read. Could also try calling Assurance support and see what Tim has to say.

having said that I flew mine all stock and it worked well. I may have been a lucky one. I recently sold it because I have a 450DFC as well and decided I only wanted one of them.

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03-05-2013 05:42 AM  5 years agoPost 3
The_Widowmaker

rrElite Veteran

Bear Valley Springs, CA

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Its updated to 3.0. Its resetting extremely fast, before there is really anything going on with the servos in terms of movement. It has never lifted.

I talked to Tim today and sent the 3GX back today. Not thrilled that they are making our customer wait for something they should have replaced. This thing has been a lemon since day one. The torque tube was bent out of the box and they sent us a new on.. in a padded envelope with no protection The swash barely fit on the main shaft and once on it would not slide not slide so we had to turn it.

We had planned on pushing just Align helis and a nice line of parts but this has been such a poor experience we are looking at going with something from GP since their support process is much better.

Hopefully this gets fixed without much more delay.

"I'm a Virgin.. I'm just not very good at it. "

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03-05-2013 07:10 AM  5 years agoPost 4
Willis

rrNovice

middle earth

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I have the same problem I'm using a external bec which does fix the problem but also have a separate receiver which makes wiring a nightmare. Can anyone confirm that the YG-18 does fix this problem.
I think you should have sent the esc back not the 3GX.

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03-05-2013 10:12 AM  5 years agoPost 5
Richardmid1

rrProfessor

Leeds, England

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I agree that it sounds like the ESC not the 3GX at fault. It could also be a dodgy servo drawing too much current. I would also try changing the BEC voltage down to 5v if possible, default is 5.5v.

60% of the time, it works every time!

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03-05-2013 03:41 PM  5 years agoPost 6
The_Widowmaker

rrElite Veteran

Bear Valley Springs, CA

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If others are not having this issue with the super combo then it could be the 3GX, ESC or as Richard said a faulty servo drawing to much power.

I did remove the blades yesterday and was able to get it to reset on the ground while spooled up and moving collective and cyclic continuously but it took longer. With blades on its almost immediately after reaching 60% plus throttle.

I did tell Tim we tried a CC 25 and had the same issue, which might be why he requested just the 3GX. Still I expected them to replace the kit so our customer is not standing around regretting his purchase for 2 weeks, which is how long it will be or more, by the time we get the 3GX back.

"I'm a Virgin.. I'm just not very good at it. "

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03-05-2013 11:52 PM  5 years agoPost 7
dkshema

rrMaster

Cedar Rapids, IA

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I had flown my Trex 550 with a 3GX this fall, using V2.1 firmware. My ESC was a Castle Creations ICE 100, and it's internal BEC had worked flawlessly on the 550 whether it was running its original 3G controller, or the new 3GX.

However, when I upgraded the SW to V3.0, the 3GX would go nuts simply sitting on the workbench, if you just tapped the unit. I reverted back to V2.1, all symptoms disappeared.

I repeated this process several times and confirmed that with the V3.0 SW, the internal BEC of the ICE 100 was no longer capable of providing adequate current for the system to operate.

I installed a CC BEC Pro in place of the internal BEC of the ICE 100, all is now well again with V3.0 loaded.

I have discovered that the 3GX system is very picky about having good, clean, adequate power, especially when you are using a satellite receiver instead of an external "normal" receiver.

Your problem is that the BEC you are using isn't up to snuff any more with V3.0 loaded.

I wouldn't write off the entire Trex line due to a bad experience with a single Trex 250, by the way.

-----
Dave

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

Team Heliproz

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03-06-2013 12:37 AM  5 years agoPost 8
AlignRC

rrApprentice

Taichung, Taiwan

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Contact Assurance
If you are running 3.0 with your 250 your going to need to either update your ESC or run a BEC. Either will work fine. The 3GX is not the issue at all. It's your power input. Please contact Tim at Assurance R/C 562-598-4700.

Again this is power related not 3GX.

Best Regards,
Jeff Fassbinder

Align - Conquer Your heart

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03-06-2013 01:09 AM  5 years agoPost 9
dkshema

rrMaster

Cedar Rapids, IA

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The CC25 ESC's BEC is rated at no more than 3 amps, that is a Peak number. Continous current, it's probably good for only about an amp and a half.

-----
Dave

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

Team Heliproz

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03-06-2013 07:41 AM  5 years agoPost 10
Richardmid1

rrProfessor

Leeds, England

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Yeah you need at least 3amp continuous bec handling current.

60% of the time, it works every time!

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03-27-2013 02:40 PM  5 years agoPost 11
The_Widowmaker

rrElite Veteran

Bear Valley Springs, CA

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Jeff.. I did contact Tim at Assurance and was instructed to send in the 3GX. At that point our customer had been grounded with a new heli for 2 weeks. After third week he became fed up and asked for a refund, which we gave him. I emailed the week after sending in the 3GX and it still had not been checked. Not that it matters because its likely not the problem as we already suspected.

Assurance has really shown very little concern in getting this cleared up in a timely manner even though we stressed the customer had already been waiting 2 weeks for a fix. In all honesty Assurance has treated us like we are not a serious hobby shop but in reality we are already the largest in the area, are pulling customers from surrounding areas that already have hobby stores, and are already expanding our building. We feel a bit lucky that we have seen how they operate prior to placing our initial stock order

Our only goal now is to get this kit replaced so we can sell it as new and move on to something else. GP and yes even Horizon are easier to deal with.

"I'm a Virgin.. I'm just not very good at it. "

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