kf4od
New Member
Posts: 1 
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Post by kf4od on Mar 22, 2014 7:20:36 GMT -8
Can the QR X350 be powered by a DC power supply to support tabletop testing?
I need do not need launch but I need to keep the motors running. I want to eliminate any issues with sensed low battery voltage while I am conducting the tests.
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Post by tontze on Apr 19, 2014 11:10:24 GMT -8
Can you plug battery to loader and quad same time ?
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rickc
New Member
Posts: 13
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Post by rickc on May 19, 2014 21:53:25 GMT -8
KF4OD : Please check an earlier forum posting on the old site for a more detailed answer that I offered .
In a "nutshell" , your machine is exhibiting the exact problem that mine has now . A "power brownout" that affects the whole system . I beleive that the 5 volt PSU on the main board is the culprit . As you are a HAM radio operator , you have at least , a remedial level of electronic troubleshooting and could test this at the bench level .
Advice from an electronic engineer : YES, you can use a benchtop PSU to power up the quad . No propellors installed on the quad , of course . You will be no doubt be testing the quad as I will for this very problem . For me , my procedure would include isolating the PSU from the main board going to the flight CPU . NOTE that there is a secondary voltage present on the white wire that I am not sure of its function . +5 volts (RED) , Ground (Black) and +3.3 volts (White ? ? ? For the accelerometer and GPS)
Also remember that the nominal voltage present under "no load" conditions will be slightly higher than those under load . Should they differ widely , replace the main board / PSU as it is faulty . (Probably too lightly designed to begin with)
My ultimate solution to this problem will be connecting up a "buck / boost" type PSU board that will derive its power from the 11.1 volt battery and will be set to supply a solid 5 volts for ALL of the electronics . (Under $5 on Ebay)
Please advise if this solves the problem .
RickC
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rickc
New Member
Posts: 13
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Post by rickc on May 22, 2014 18:25:40 GMT -8
Please feref to my later posting on this board for your solution and repair procedure . This solution workes well and was extensively flight tested . The bonus is the the required part is priced under $3 US !
Let us know how it worked for you .
RickC
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