FT Gremlin Guardian Power Loss

[LNXMachine]

I built a Gremlin Guardian and while I'm flying it will sometimes lose power for a split second where it drops several feet before the motors start back up. Sometimes they never restart, and I have to disarm and rearm it before I can fly again. I just few it a few minutes ago and it lost power twice and complete stopped once.

I'm using a Lemon RX receiver with a Spektrum DXS receiver. Trying to narrow down if it's a flight controller issue or RX issue. I checked all the connections for shorts when I soldered everything up and nothing showed up. Any thoughts?

 

[JasonK]

- How long into a flight is this?
- What is the cell voltage of the batteries after this happens?
- Do you loose video?
- Is there an OSD on the gremlin? if so, can you record the DVR with cell voltage on it when the issue happens?
- have you check your wires to make sure you don't have anything that could bump/short/come loose?

 

[LNXMachine]

- How long into a flight is this?
- What is the cell voltage of the batteries after this happens?
- Do you loose video?
- Is there an OSD on the gremlin? if so, can you record the DVR with cell voltage on it when the issue happens?
- have you check your wires to make sure you don't have anything that could bump/short/come loose?

It varies how soon into the flight, I've had it happen 30 seconds in or it's flown for a few minutes before doing it. I'm flying it line of sight, so no FPV. I haven't tested the voltage of the battery after flight, I usually don't fly it enough to drain the battery completely and I've been charging it fully before flying again. I have 2 650mAh ones, I can try the other battery, not sure if I have used it yet.
I just took it apart and checked all the solder joints, they look good and solid.

 

[JasonK]

sounds like something is either triggering the FC to restart or your loosing radio link. with out a black box log or OSD data recording, it can be hard to ID what is happening. off the top of my head I could see any of the following:
- bad connection between RX and FC board
- RX loosing signal causing a failsafe
- to much noise on the power rails causing the FC to restart (missing/damaged capacitor)
- power voltage sag causing the power getting to low causing the FC to restart
- random short/loose wire somewhere
- motor sticking slightly causing unusually high current
- sensor on FC going haywire causing the FC to trigger a panic state causing it to restart itself

Can you get a video of it flying with it happening?
do you get any telemetry on your radio? if so, can you record it and share the log?

[with out some data, we are mostly guessing... if your flying LOS, the easiest way to get that data - putting it on the OSD and recording the DVR isn't available... which leaves black box recordings or recording any telemetry data going back to the TX]

 

[LNXMachine]

I redid the battery connector solder connections and was able to fly for over five minutes without any issues. Thanks.