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HomeAircraftHelicopterGasser Model RC HelicoptersOther › whoops!! now what? over voltage from LIPO and un regulated RX...
08-10-2009 02:32 AM  8 years agoPost 1
obin

rrApprentice

wilmington nc

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So, yea, I did it...ran some standard servos and my new Futaba GV-1 on my Spektrum 7100 RX at ....8v! did not see the "5.2v" and the non regulated side on the AR7100 RX......so.....blew a few servos...lucky I have not crashed due to this mistake...question is this:

1 If the GV-1 throttle governor is still working did I damage it? it appears to be fine...

2 buying a regulator and setting it at 6v feeding the ar7100 for all the new servos..see any issues with doing this?

3 the servos that still work, are they about to fail due to high voltage or are they just fine and can be used for years after this? they have maybe 10 flights on them...all Hightec metal gear high torque

thanks for help. I REALLY don't want my Condor with camera to hit the ground anytime soon!!!

whats safest?

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08-10-2009 02:36 AM  8 years agoPost 2
obin

rrApprentice

wilmington nc

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I just bought this:

http://www.fromeco.org/Products/02F...33/Default.aspx

planning on running it at 6v into the 7100 rx for all standard servos

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08-10-2009 05:03 AM  8 years agoPost 3
obin

rrApprentice

wilmington nc

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Anyone have feedback?

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08-10-2009 03:58 PM  8 years agoPost 4
obin

rrApprentice

wilmington nc

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this post dead?

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08-10-2009 05:26 PM  8 years agoPost 5
pgkevet

rrKey Veteran

Wales

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..anything wrong with a cheapo align step-down?

pgk

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08-10-2009 05:41 PM  8 years agoPost 6
AceBird

rrElite Veteran

Utica, NY USA

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Anyone have feedback?
Although there are people on this forum that have camera ships you should be posting your concerns on the Aerial Photography and Video forum. I would keep the electronics of the heli separate from the camera equipment. No need for hi voltage regulators on the heli with a generator set up.

Ace
What could be more fun?

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08-11-2009 02:53 AM  8 years agoPost 7
obin

rrApprentice

wilmington nc

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I stay as far away from the "photography" section as I can get some not so nice folks hang around that place. gives me the chills thinking about it.

I had some specific questions above, anyone care to answer them or should I just "shoot blind" here and hope I'm ok?

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08-11-2009 02:54 AM  8 years agoPost 8
obin

rrApprentice

wilmington nc

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Specific questions 1, and 3 I'd love an answer for.....

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08-11-2009 02:57 AM  8 years agoPost 9
aussie_g

rrVeteran

Travelers Rest, South Carolina, USA

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Either ditch all the servo's or send them for service....

The GV-1 is fine - it wont hurt it at 8v.

Buy a 6v regulator for your repaired/replaced servo's....
(make sure it is capable of your required amperage)

Make sure you plug the gyro/tail servo into a 5.2v regulated port on the 7100...

DO NOT risk your heli or your safety on those servo's

Gareth

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08-11-2009 03:14 AM  8 years agoPost 10
Brett Horton

rrKey Veteran

---------

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What ???? you don't believe me!!
JK

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08-11-2009 05:36 PM  8 years agoPost 11
Justin Stuart (RIP)

rrMaster

Plano, Texas

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..anything wrong with a cheapo align step-down?
The Align stepdown is just a diode in the positive lead. It will drop the voltage by 0.7 volts, so if you're using a fully charged 2S lipo and your voltage is 8.4 volts, the "cheapo" Align stepdown will drop you to 7.7 volts.

If you have a "regulated" 6.0V source, the Align stepdown will give you 5.3 volts to your tail servo. Otherwise, it is worthless.

Avant RC
Scorpion Power Systems
Thunder Power RC
Kontronik Drives

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08-11-2009 09:21 PM  8 years agoPost 12
AceBird

rrElite Veteran

Utica, NY USA

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DO NOT risk your heli or your safety on those servo's
I agree but if you send them back for service what will they do to them? Usually you would either put them in an oven for a bake test or put overvoltage on them to see if they survive. And there is always the possibility that they would just plug them into a power source and test them the same way we do. One thing is for sure they are not going to spend a lot of time on them because it would be cheaper for them to just give you another.

As I said, I agree with you. So for peace of mind on a camera ship especially, I would start with all new servos. Use the servos that got zapped on the camera mount.

Ace
What could be more fun?

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08-11-2009 10:32 PM  8 years agoPost 13
BrunoBL

rrKey Veteran

Pomerode, SC, Brazil -26.71, -49.17

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Use the servos that got zapped on the camera mount.
There's a good idea.

Also, instead of using lipos, step-downs, diodes, regulated supplies and whatnot, why don't you just use a generator and run all the electronics at 4.8V? IIRC, Rbort will probably make you a generator with two distinct output voltages, i.e, 4.8V for Rx, servos, gov & gyro, and 9V or 12V for video and downlink. Sure is worth a closer look IMO.


...Bruno.
Spectra G on Avgas 100LL, Jewel generator
T-Rex450SE V2
DX7

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08-11-2009 11:11 PM  8 years agoPost 14
ozghost1952

rrApprentice

Melbourne Australia

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Be careful with "regulating" a rudder servo such as a 9254 that does not like much more than 5V - many regulators have a 5V outlet for the receiver rudder channel - but when you plug the "rate" channel for the gyro directly into the receiver - it delivers the "6v" to the servo that you are trying to protect with "5v"

I have overcome this on a GY 520 gyro setup with 9254 servo - by using only the signal wire to the "rate" channel channel - much like the GY401 setup - the yellow single wire - and verified that the servo only receives "5V". When using the 3 wire rate channel connector - it was receiving "6V"

Hope this is helpful

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08-13-2009 04:08 AM  8 years agoPost 15
obin

rrApprentice

wilmington nc

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thanks folks. Im good now, new servos and im just running 6v nimh pack instead of all that mess.

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08-13-2009 04:10 AM  8 years agoPost 16
obin

rrApprentice

wilmington nc

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Ok one more question, what AMPS can I charge the NIMH pack at? can I run 4 amps? more less? I have the new Cellpro charger with the little RX batt breakout box that allows you to charge NIMH then I set it at NIMH and 4amps...ok?

Anyone know of a digital READOUT that I can glue to the canopy so I can see RX VOlts every time I land for safety?

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08-13-2009 05:13 AM  8 years agoPost 17
jimboflies

rrElite Veteran

Beaumont, Texas;

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Charge the NIMH pack at 1C rate.

EP8 EX twinring frame
Quick of Japan
EP8v2 EX
EP9

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08-13-2009 02:24 PM  8 years agoPost 18
obin

rrApprentice

wilmington nc

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I understood NIMH can take more then 1c.......no?

I have put 2 charges on it at this point around 3-4 amps...is it now trashed?

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08-13-2009 09:43 PM  8 years agoPost 19
AceBird

rrElite Veteran

Utica, NY USA

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Anyone know of a digital READOUT that I can glue to the canopy so I can see RX VOlts every time I land for safety?
VoltWatch is one but there are others. Bear in mind that voltage alone is not a good way to determine what is left in a battery and it is even less reliable with NiMh’s which is why I stick with Ni Cads and a back up generator.

Without a generator a practice of knowing what went into a pack, time laps in use and repeated voltage checks under load over time will give you some assurance that you are OK. However, without redundancy (power source) you are always open to the got-cha.
I have put 2 charges on it at this point around 3-4 amps...is it now trashed?
Not necessarily. If you are using a charger that is meant to charge NiMh’s at the higher rate it could be even better for the pack.

Ace
What could be more fun?

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08-14-2009 01:38 AM  8 years agoPost 20
obin

rrApprentice

wilmington nc

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yea I am feeling that!~

I guess I will get a generator....anyone like them? care to comment?

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