Here are the symptoms the Quanum Nova is displaying with a failed ESC or motor:
- On power-up, the Nova's power-up sequence of Motor & ESC twitching/ beeping is different and abnormal. It lasts a few seconds longer than normal, but finally stops.
- It still allows you to Arm the aircraft. If you remember to bump the throttle on/off a few times (to make sure all props/motors spin on command) you will likely find one prop not responding properly. If you forget to test and attempt to take-off anyway, the multi-rotor will likely flip and crash.
Here is something I noticed and might further help in troubleshooting.
If you disconnect only the PWM signal cable (the Dupont connector at the FC) of a "suspected bad" esc/motor-set (but leave power going to the ESC), and then power-up the Nova ...
- The known-BAD set continues to twitch/beep constantly.
- A known-GOOD set does not twitch/beep constantly. It does for it's initial test, then goes quiet like normal.
The ESC soldering, wiring, and PCB look fine. I see no blown chips or bad soldering.
I opened the motor, and the windings look good. My new LC/LCR meter (a gift) is not working properly for motor coil measurements in uH/mH, so I have another one on order. I will update this post later.
Ok, I got a working LC-Meter. This motor appears to be good because I am getting the following between the 3 motor pairs: 35.8, 35.6, 36.2 uH (aka mH). I took the readings with the magnet-bell removed and they were as they should be (within 10% of each other). Also, windings and magnets physically look good (nothing melted, burnt, or out-of-place).
I installed a used/working Nova v2.4 green-led-ESC. Seems motor solder-pads are in a different orientation than old v1.6 ESCs. I say that because after soldering to match the bad ESC, I still had to swap a motor wire-pair to get this motor to spin in the proper direction. It was no big-deal, but note worthy. It behaves like a good ESC/Motor set now (see above ... both tests ... connected and disconnected). I needed to program the ESCs (all-at-once) and re-do all calibrations.
Toward the end of ESC-Calibration, I observed that all motors now spin properly and turn in the proper directions. There is also a Motor Test in MissionPlanner. I like to do it from Terminal.
More repairs and updates documented here.
Edit: Just wanted to mention that it was indeed just a blown ESC (almost brand-new and blew without cause). This one v2.4 ESC works and flies fine with the other three v1.6 ESCs.