3GX, all the green lights flashing- help

[BgBrik]

I have a 3GX in a new 450 Pro with DFC head and MKS DS92 servo's

When if gets up to enough revs/pitch to about lift off it tips over as if the 3GX is not set up correctly, although I have checked it several times and am reasonable sure it is.

On picking the heli up all the green lights on the 3GX are flashing, and no status lights are lit. I think this means it has had a signal loss (although the lights are solid on the satellite Rx) or maybe a power loss. My suspicion is that the BEC built into the standard align ESC is not producing enough power.

Can anyone help please?

[tourerjim]

Did you go through the esc setup first as you need to calibrate your throttle & also you need esc bleeps 1, 2, 1 2, 3, & 6v bleep 3, tx throttle norm must be set to linear.

[GIXERMAN]

If you running 3.1 software, the standard enough bec isn't really rated high enough. You can bench test with main and tails removed by pitch pumping for 30sec or so.

[tourerjim]

If you running 3.1 software, the standard enough bec isn't really rated high enough. You can bench test with main and tails removed by pitch pumping for 30sec or so.

I have the 450pro dcf & the bec is fine.

[AlastairC]

As Jim says check your throttle calib. With the MKS servos the standard BEC may be struggling. Mine was very sensitive to how high I adjusted the gains. Really had to keep them at 11 oclock or I would end up with issues (either flashing sats or a 3GX that needed re-setup as it lost its settings in the brown out). I ended up putting a external 10amp Castle BEC on and all problems went.

If the BEC is ok the tip over can be vibes or the gains too high. On the 450 11 oclock should be fine.

[BgBrik]

Thanks all for your responses. I cannot believe that I hadn’t checked the esc - I assumed it was the defaults in the instructions and it wasn’t - it was all 1's. Unfortunately that hasn’t cured the problem. Does anyone know the exact meaning of all the 3GX lights flashing? Thanks to Gixerman for suggesting bench testing with blades removed – great I can reproduce the fault on the bench. I watched the Satt lights flash and the 3GX reset after about 10s of pitch pumping. Over the weekend I upgraded the 3GX to 3.1 (from 3.0), reduced the gain a bit, setup again! still the same. Have ordered a CC 10A BEC having become convinced that’s the problem. I will report back in a few days.

[tourerjim]

After you done esc setup did you go through 3gx dir setup follewed by gov setup.

[Lou Swheel]

Mine did it also.
I was told to get it in the air quickly. Because when the gyros gets no response from the helicopter, it will keep pushing.So it goes over. Something to do with controlling the 3gx and not the helicopter. Was perfect when I got it of the ground. It almost flies itself.

[Lou Swheel]

do you have a manual for it?
I can email you a copy of mine if you need it.

[BgBrik]

I have now fitted a CC 10A BEC, and everything just worked. Although I have only hovered a couple of batteries in the garden I am confident that all my previous problems have been solved. Thanks all for your support.

[coolice]

Hey.

Glad to hear you are all sorted.

As already diagnosed the flashing led's were signalling the 3GX had browned out, the voltage to the unit had dipped below 3.3 volts and the unit had reset in flight.
V3.1 is much more power hungry than past firmware's and dictates the need for a much more powerful BEC supply than the stock ESC is capable of delivering, the CC BEC you have fitted will work great. If you have not done so already check it is programmed to 6 volts output, as out the packet they come set to 5 volts and to meet the 3GX required specs the servos need 6 volts ideally.

Mine did it also.
I was told to get it in the air quickly. Because when the gyros gets no response from the helicopter, it will keep pushing.So it goes over. Something to do with controlling the 3gx and not the helicopter. Was perfect when I got it of the ground. It almost flies itself.

Hey.

All FBL units are what is known as "rate demand" meaning that your stick inputs do now not command a cyclic pitch deflection, but a specific rate of rotation in degree's per second. When the model is still on the ground, it will not move in response to stick inputs as the skids will stop the model moving, the FBL unit senses the pilot is after a specific movement and throws in more cyclic pitch to achieve what the pilot is after. Hence the tendancy for models to roll on the deck when cyclic is used, so it is advised not to move the cyclic if at all possible until airborne.
.
.

[tourerjim]

Hey.

All FBL units are what is known as "rate demand" meaning that your stick inputs do now not command a cyclic pitch deflection, but a specific rate of rotation in degree's per second. When the model is still on the ground, it will not move in response to stick inputs as the skids will stop the model moving, the FBL unit senses the pilot is after a specific movement and throws in more cyclic pitch to achieve what the pilot is after. Hence the tendancy for models to roll on the deck when cyclic is used, so it is advised not to move the cyclic if at all possible until airborne.
.
.

I agree with Ian but just like to mention moment heli becomes airborne there should be no to very little drift with the exception of wind.