Hey folks!

I've been working on creating my own hexacopter based off of this frame: http://www.californiakiteboarding.com/includes/product_7634_DJI-Fla...

Its a DJI Flame Wheel F550 kit. 

I've got a turnigy9x radio and receiver as well as a CC BEC 10a since the ESCs don't have one built in. 

I'm having trouble getting the ESCs to arm/calibrate. Whenever I supply power to the escs/motors there is a constant beeping no matter how I hook up the BEC. Even removing the APM from the setup and I still get a constant beeping. Here are some of the things that I've tried as I've search here and on google. The radio does have a connection to the APM when it is connected as I can see the values moving in the software of the radio calibration.

1. Make one of the ESCs a crude BEC by removing the red power line from the signal wire.

2. Arm the ESCs with the radio by moving the throttle all the way up, down to the far left, all the way down, and I've tried turning down the trim on the throttle to get below 1000. 

3. Remove the APM2.5+ from the setup and connect the signal line from the escs directly to the receiver and do the same method in #2. - the ESCS are powered the PDB from the APM kit. 

4. Tried arming the escs/motors in the APM software with the APM hooked up.

I think it's one of two issues: either something is faulty as all the connections are soldered and solid OR the turnigy won't arm/send a signal to the ESCs because I'm missing a step. 

Any help would be extremely appreciated!

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DJI ESCs cannot be calibrated. Nor do they need it.
DJI ESCs have no BECs.
I have the F450. I use the 3DR PM to power it, as I have no servos. Jumper jp1 is out.
I didn't use the 3DR PDB in my F450. I connected my DJI ESCs directly to the APM.

Ok so did you ever get the constant beeping? Because every time I plug in the battery the ESCs constantly peep like an alarm clock.

Never got the constant beeping.  Something's amiss in your wiring, perhaps.

Are you using the 3DR PM?

Are you using any servos?

NOTE:  ESCs are powered by the motor battery.  The APM merely supplies control signals to the ESCs. 

There must be a shared gnd, between APM and ESCs, for ESCs to function correctly. 

If you have a 3DR PM the shared gnd is there. And your APM has power.  If no servos, the PM is all you need - the BEC is only needed if you have servos or no PM.

Else if no PM, you must use a BEC powered by the flight pack battery, and plug that into your outputs +5v and gnd pins.  And that provides the APM pwr as well as the shared gnd with the ESCs.

I'd drop the 3DR PDB - it's unnecssary on a DJI frame.


Well I removed the APM from my current setup to get the motors to function without it.

In the picture you can see what I have currently setup. The PDB powers the escs which are connected to the motors. The signal wires go straight to the tunigy 9x receiver with the red wires unplugged. 

The CC BEC is connected to the PDB and has a green light when powered. The BEC connect to the battery connection on the receiver. 

The radio is bound to the receiver properly, I just did it again to make sure! I am using the 3dr pm but that's not currently in use as the APM is disconnected. And no servos are being used. 

Thanks a ton for your help Tim!

So - do you motors spin with this setup?

The motors do not spin in this setup and the ESCs still beep about every .25 seconds.

Try this ...

Remove all but one ESC/motor from the PDB

Remove the BEC from everything.

Power the rcvr using the 5v/gnd two wire cable from the PDB.  Connect it to any 5v/gnd pins on the rcvr.

Connect the flight battery to the PM, and the PM to the PDB.

Then turn on the transmitter, and see if you can move the motor

If not, it's likely the PDB, and from your pic, which is fuzzy so I may be wrong here, but from your pic, I'd say some of the soldering on the PDB is suspect.

Just for laughs - how do you know your transmitter and rcvr are working?

Do you have a voltmeter?  Have you measured voltages anywhere?

Are you a newbie to soldering, debugging electric circuits, etc.?  Help me to understand who's posting.


what battery are you connecting to the PM?

Battery is a venom 4200 nimh 7.2v power pack. 

I just setup like you said with the BEC removed and all but one esc/motor connected. Still got the beeping. The power line from the esc to the receiver is still removed. 

I think I know the transmitter and receiver are working because when they're hooked up to the APM I can pull up the radio calibration and watch the values go up and down as I move the the six channels that are connected. I also rebound the transmitter to the receiver and got a solid red light after powering on the transmitter and holding the binding button on the back.

I'll admit I am a newbie at soldering but I do know how to use a volt meter and have one in front of me! So the soldering could be an issue on the PDB but there are definitely not two different joints accidentally connected through solder. Tell me what I should measure wise teacher! 

What power line from ESC to rcvr was removed?  Don't know what you're referring to.

The 3 wire cable from ESC should be connected to rcvr.

The 2 wire cable with 5v/gnd from PDB should be connected to 5v/gnd pins on rcvr.  Or just measure any 5v pin on rcvr, with cable connected, to verify that rcvr's getting 5v.

Voltages to measure ...

Battery voltage.

Battery voltage where the PM connector enters the PDB.

Battery voltage at ESC, where PDB wire connects to ESC.

The two wire 5v/gnd cable from PDB to rcvr, at the connector that plugs into the rcvr.  You can remove it from the rcvr to measure the voltage.


The 30a opto (these have no BECs btw) - I removed the red positive line from the connection to the receiver. The signal and negative wires are still connected.

I might have found the problem but something still doesn't make since! Let me answer your questions first and then I'll explain. 

Battery voltage: 7.9 Volts

Battery voltage at PDB from PM connector: 7.9 volts

Battery volt at ESC/PDC: 7.9 volts

Battery  voltage at two wire 5v/gnd cable: 0 volts! 

So found an issue there but I also measured the BEC when it was connected and it came out as 5.1volts. When I connect the BEC to the receiver and have one ESC plugged in the ESC still beeps! 

Just remembered that PDB doesn't have own 5v - it uses a BEC from an ESC for its 5v - so you cannot use that 5v PDB cable to power your rcvr.  You do need the separate BEC to power your rcvr.  Sorry bout that.  As I said, I don't use the PDB.


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