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Mikado V-BAR Mikado V-Stabi/V-BAR Flybarless System Software and Hardware Support

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Old 12-03-2011, 04:13 AM   #1 (permalink)
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Default Can the VBAR handle the AMPS?

I was looking at the beastx forum and found this.

Post 63
... the MB was designed for the future to use 2s Lipo directly and this also worked out in our tests. I also hear more and more of problems with such servos. So at this time there are real power servos on the market and especially some new HV servos can draw an extreme amount of peak current so it really is better to supply the servos with a separate power line.
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Old 12-03-2011, 04:18 AM   #2 (permalink)
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Without a problem, the powerbus on the VBar is a big fat one.

4 x 8717 with a little load and you wiggle the sensor = peaks 66A (short transient peaks, but still)

So yes, it can draw HUGE amounts of current.
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Old 12-03-2011, 10:56 AM   #3 (permalink)
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One of the main reasons to run a separate power bus on the BeastX and other all-in-one units like mini-VBar, 3GX, and SK-720 is that all those large gauge servo wires conduct a lot of vibration into the unit. On the SK-720 I've measured a 50% reduction in vibration by simply moving the servo cables to a power bus and only running 28 gauge wires to the SK-720.

So, for mini-VBar it might be useful to run a separate power bus if using full-size servos but the full-size VBar controller isn't affected by vibration and, as Mr. Mel says, it has large power and ground traces on the servo backplane so not necessary.

If using 8717, 8917HV's, or other high current servo it is wise to run an additional power plug to an unused connector position on the VBar since the little servo connectors are only rated at 5 amps or less and that's only if they are high quality and in new condition.
Stuff I fly....
Mikado, a couple of Aligns, VBar/SK720, an old Robbie Nova,
some multirotor stuff w/ AutoQuad6, Naza, APM, PX4, and full size Exec162F and a T210 just for fun!
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