I've a 3DR hexacopter, new. 

It has the PM (Power Module), the PDB (Power Distribution Board) and an APM2.5 with no jumper on jp1.

Online, I've found some instructions telling me that when using the PM, one is to leave jp1 unjumpered, and to plug in the +5v coming from the PDB.

 

Is this correct?

 

Yesterday, I USB'd into the APM2.5, and downloaded 2.81 firmware.  So I know it's alive - so far.  Don't want to plug things in incorrectly.

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Here's the instructions I was referring to, from the arducopter wiki docs

 

Note for ArduCopter users: you must remove the APM's JP1 jumper when using the Power Module so your electronics are only powered from the Power Module's onboard regulator and not from your ESCs. You can leave the jumper present if you are using "no-BEC" ESCs (the jumper's presence does not matter in this scenario). The two-wire PDB power cable should still be connected to the APM's output pins, as this is the ground connection between the APM and the ESCs.

I think the wiki should be reworded to "no JP1 when using the power module." why add the ambiguity. I don't think the idea is to power servos with the PM module?

The part I find confusing, is the statement about only powering the electronics from the PM, and then asking me to hook in the PDB's 5v power as well.

 

That seems to me to be conflicting - and it's why I posted this query - looking forward to an answer.

I just setup my Quad using the PM and i did not put the JP1 jumper in i left all the other connections in place as they were and the Quad performs fine.  It real should say if using the PM do not use the JP1 jumper. I also tried it without using the PM and installed the JP! jumper and the Quad ran fine.

Did you also have the +5v from the PDB connected to the APM2.5 as well as the PM?

The electronics refers to the APM and R/C Receiver, it's confusing terminology.

I think that if you power your board using the APM PM you should not ever have JP1 in place to connect INPUT and OUTPUT 5V rails. The reason I say this is that the APM PM is rated 2.25A MAX, so driving additional servos could quickly max this out and cause a brown-out.

Thanks for the clarification. 

Does the jp1 jumper connect the output conn's 5v rail with the APM's 5v rail?

If so, then it's function becomes quite clear.

Yes I had the +5v from the PDB connected to the APM 2.5 as well as having the PM connected and all works fine.

Thanks for the help.

>>>Yes I had the +5v from the PDB connected to the APM 2.5 as well as having the PM connected and all works fine.

You should only do this when JP1 is removed

>>> Does the jp1 jumper connect the output conn's 5v rail with the APM's 5v rail?

If so, then it's function becomes quite clear.

Yes it does

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