HW 50A V3 rpm signal

[helidude71]

I want to connect the yellow RPM signal cable, from my HW ESC, to my Mini V-Bar.
The V-Bar manual says it's not allowed to use signals on RXA above 5 Volt.

The BEC on the ESC is set for 7.4V.
Does this mean the RPM signal output is also 7.4V?
Or are the RPM signals always below 5V and safe to directly connect to the Mini V-Bar?

[helidude71]

OK, searching does work sometimes.

https://www.helifreak.com/showpost.p...6&postcount=15

Is 3.3V confirmed?

[mverhorst]

Not by me, but it's been said before.

[helidude71]

Hmmm, thx.
Maybe I'll check with a scope to make sure.

[mverhorst]

Yeah, that would be great..

Building new model? Say your thread on the V-bar forum also...

[helidude71]

Yes, it's for my X3 which is ready.
It's just me never done V-Bar governor.

[helidude71]

Oh yes, got this from a HW developer guide.

【Output Port for RPM Signals】
• Platinum V3 series of speed controllers have independent output ports for RPM signals.
• Specification for interface signals: It is the periodic signal with duty ratio of 17%, and 0V for low level, 3.3V for high level.
• It represents the electric rev of the brushless motor (electric rev means the rev of a 2-pole brushless motor). And here is the formula used for converting the actual rev of multi-pole brushless motor into
the electric rev of 2-pole brushless motor:
Electric rev = Actual rev of the multi-pole brushless motor × Pole number ÷2
E.g. the actual rev of a 12-pole motor is 5000rpm, so its corresponding electric rev is: 5000 × 12 ÷ 2 = 30000rpm

[mverhorst]

Originally Posted by helidude71

Oh yes, got this from a HW developer guide.

【Output Port for RPM Signals】
• Platinum V3 series of speed controllers have independent output ports for RPM signals.
• Specification for interface signals: It is the periodic signal with duty ratio of 17%, and 0V for low level, 3.3V for high level.
• It represents the electric rev of the brushless motor (electric rev means the rev of a 2-pole brushless motor). And here is the formula used for converting the actual rev of multi-pole brushless motor into
the electric rev of 2-pole brushless motor:
Electric rev = Actual rev of the multi-pole brushless motor × Pole number ÷2
E.g. the actual rev of a 12-pole motor is 5000rpm, so its corresponding electric rev is: 5000 × 12 ÷ 2 = 30000rpm

Great find!

Good luck with your gov! And stick to Futaba

[lasakro]

Originally Posted by helidude71

Oh yes, got this from a HW developer guide.

Would you be so kind as to share the link to the 50A V3 Developers Guide? I've searched the HobbyWing site and Google and can't find it.