Telemetry values from Kosmik 160HV goes crazy.

[dit71]

Helllo,

as soon as the motor is running the telemetry values of the Kosmik 160HV are going crazy as you can see in the screenshot. I use an extended telemetry cable from the Kosmik telemetry port to the Spirit GTR, and if the motor isn't running everything works fine, but as soon as I start the motor the values are very strange and a max BEC current of 33A and a Temperature of the Kosmik from 139°C cann't be true, because the heli is running for a few seconds without the blades and I didn't touch any stick.

Dieter

[ZeXx86]

Hello,

can you let me know how you extended the cable?
It shouldnt be longer than 50cm.

[dit71]

Hello,

I cut the wires in the middle and soldered a short wire between the two parts. It's know excatly as long as I need to connect the Kosmik in the front of the Chronos 700 with the spirit in the back of the heli. The exact length I have to meassure in the evening.

In your shop I didn't found a longer telemetry cable.

Dieter

[dit71]

It‘s about 37cm long.

Dieter

[dit71]

Hello,

with this behaviour, for me it isn't possible to fly. I have set several alarms, for example for the temperature of the Kosmik, or the bec current, but now I get every few minutes an alarm, because of the malfunction of the telemetry system.

Obviously I have to buy a telme and and a Jeti Receiver just to get correct telemetry values

Or does someone have a better solution?

Dieter

[ZeXx86]

Hello,

I recommend to update ESC to the latest version. Hopefully it will help. Certainly this is not correct behavior.
It could be related to firmware in the ESC or something is wrong with your cable.
It should be wired far from motor, belt and high power cables.

Please note JETI receiver is not needed even for Kontronik TelMe module, since Spirit GTR has telemetry ports too.

[dit71]

It is the latest Firmware (4.17) on the ESC and it is wired far away from everything, as you can see at the pictures. The cable is okay, otherwise I wouldn‘t get any telemetry value.

Dieter

[DongZhi-CN]

Try adding a magnetic ring in the middle of the telemetry data line and winding it 5 times.

[dit71]

Hello Dong,

is this just a suggestion or do you have experience with it?

Do you mean a neodym magnetic ring? If have to look where I get such a magnet.

And it means I have to extend the cable to 50cm length.

Dieter

[ZeXx86]

Hello,

if there is problem just when motor is running then it is very probable that a random noise is picked up by the cable or that the cable is not good.

When you extend the cable it adds additional connection and probability of errors.
And maybe you have not used twisted cable. Twisted cable is much better for noise rejection.