Spirit System

Hi.

I have a Hobbywing Platinum V4 120a ESC on an SAB Kraken helicopter.
It connects to a spirit2 flybarless unit.

I accidentally connected the BEC output reverse polarity into the flybarless. The throttle connection and the optiguard backup were connected correctly.

Am I likely to have damaged anything or will the spirit prevent reverse polarity going back out to other connections?

Thanks, Ian.

Hi,

it depends how exactly BEC cable was connected. If it was only reversed servo connector, nothing wrong will happen.

Hi.

I had positive and ground reversed.

I only had 2 wires in the connector (signal wire was for governor and not connected) and wired them backwards at the extension I made.

Remember the positive wire is in the center of the connector exactly to prevent this scenario. If you connected positive to signal it would have likely destroyed the MCU. If connected to ground the ESC might have saved you if it has startup current/short circuit protection.

If there was a smoke or smell during this event, then I am afraid it is burned. In the most cases we are able to repair it, in some cases the cost could be just 5 USD.

I'm sure there was no smell, but I'm obviously a bit tentative about flying it.

If I did damage anything internal In the flybarless unit, would it stop anything from working? Would it be obvious it's damaged?

I've had it cable tied to a picnic table to set and test the head speeds and everything seems ok.

Thanks.

Mona wrote: Thu 12. Mar 2026 12:15:50 Remember the positive wire is in the center of the connector exactly to prevent this scenario. If you connected positive to signal it would have likely destroyed the MCU. If connected to ground the ESC might have saved you if it has startup current/short circuit protection.

I have contacted Hobbywing asking them this but had no reply.

Ian.