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I've had a long-running problem with various Spektrum Rxs (AR6100E and AR6200 - the latter QC and pre-QC) misbehaving in a pair of GAUI EP100s (3-blade and SE Pro).
The symptoms vary, but are broadly as if the Rx momentarilly loses power. ie pre-QC go off-line for a few seconds; QC blink LEDs. I've also seen some weirder things with QC Rxs.
One good piece of advice was that this can be caused by the motor drawing too much current due to too much CP, or too high gearing. Lowering the gearing on 3-blade (AR6100E pre-QC) seems to have fixed the problem, and I've been very happy with it.
The SE Pro has been a different story, and I've gone round almost in circles swapping compnents, lowering gear ratio, etc.
I've gone as far as literally swapping out the entire electrics (inc several Rxs), lowering the gearing, and running a CC Phoenix 25 in place of the 12A GAUI BLDC ESC. Batteries are 20C (30C peak) FlghtPowers - higher spec than the supplied 10C E-Sky ones.
I didn't believe there was a mechanical problem - but it's possible the SE Pro problem got worse when I installed heavier flybar 'stability' weights.
I seem to have got to a point where, with no rotor blades, and a flat pitch curve, it won't reliably run the main motor with the swash servos connected and mechanically installed; but will with four identical servos plugged in - but sitting disconnected.
I find this surprising...
I've read here that binding servos can trip-out the BEC - which makes sense.
However, these servos are connected to a 3A BEC on an underloaded 25A ESC, and the servos are dinky little Blue Arrow BMS-306BB micro servo http://www.buzzflyer.co.uk/GAUI-Mini...rvo/p-115-754/ .
Added to this the pitch curve is flat (for testing), so they aren't being required to move.
I've also run with a power meter on the main battery (not drawing more than 3A in test), and a DVM on the Rx battery pins (didn't drop below 4.97V, inc when juggling throttle and cyclic).
What this wouln't tell me is if there was some kind of transient spike. eg a servo momentarilly needed a lot of current (why?), and the Rx power momentarilly dropped accordingly.
There's nothing obviously causing things, and there's no particular behaviour (eg fast throttle up, wang cyclic pitch around) that provokes a problem.
At this stage, the only possibility I can come up with is that the Rxs are a bit over-sensitive to power voltage variations - though I haven't seen any such variations. I might try blagging a loan of some data-logging gear to look for power spikes.
Has anyone come across anythig like this ?
I wonder if a fair-sized electrolytic capacitor across the Rx power pins would help ? (All the ESCs seems to have one across the battery input.)
The symptoms vary, but are broadly as if the Rx momentarilly loses power. ie pre-QC go off-line for a few seconds; QC blink LEDs. I've also seen some weirder things with QC Rxs.
One good piece of advice was that this can be caused by the motor drawing too much current due to too much CP, or too high gearing. Lowering the gearing on 3-blade (AR6100E pre-QC) seems to have fixed the problem, and I've been very happy with it.
The SE Pro has been a different story, and I've gone round almost in circles swapping compnents, lowering gear ratio, etc.
I've gone as far as literally swapping out the entire electrics (inc several Rxs), lowering the gearing, and running a CC Phoenix 25 in place of the 12A GAUI BLDC ESC. Batteries are 20C (30C peak) FlghtPowers - higher spec than the supplied 10C E-Sky ones.
I didn't believe there was a mechanical problem - but it's possible the SE Pro problem got worse when I installed heavier flybar 'stability' weights.
I seem to have got to a point where, with no rotor blades, and a flat pitch curve, it won't reliably run the main motor with the swash servos connected and mechanically installed; but will with four identical servos plugged in - but sitting disconnected.
I find this surprising...
I've read here that binding servos can trip-out the BEC - which makes sense.
However, these servos are connected to a 3A BEC on an underloaded 25A ESC, and the servos are dinky little Blue Arrow BMS-306BB micro servo http://www.buzzflyer.co.uk/GAUI-Mini...rvo/p-115-754/ .
Added to this the pitch curve is flat (for testing), so they aren't being required to move.
I've also run with a power meter on the main battery (not drawing more than 3A in test), and a DVM on the Rx battery pins (didn't drop below 4.97V, inc when juggling throttle and cyclic).
What this wouln't tell me is if there was some kind of transient spike. eg a servo momentarilly needed a lot of current (why?), and the Rx power momentarilly dropped accordingly.
There's nothing obviously causing things, and there's no particular behaviour (eg fast throttle up, wang cyclic pitch around) that provokes a problem.
At this stage, the only possibility I can come up with is that the Rxs are a bit over-sensitive to power voltage variations - though I haven't seen any such variations. I might try blagging a loan of some data-logging gear to look for power spikes.
Has anyone come across anythig like this ?
I wonder if a fair-sized electrolytic capacitor across the Rx power pins would help ? (All the ESCs seems to have one across the battery input.)
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