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e-Electric Motors & Controllers > Governor mode problem: Kontronik Beat 50-8-30
 
 
JohnC
Veteran
Location: East Yorkshire, England

Hi,

I wonder if anyone can help me solve this:

I set the governor-mode for my Logo-20 to run at 1550RPM a couple of weeks ago. Worked great. Took it out the other day and noticed that it was running fast (basically 100% motor power I think).

I figured it may have changed mode. I reprogrammed the speed controller it into governor mode. Tested it again: still high. Reduced the throttle from 80% to 70% and it started govering at 1560 RPM.

Took it out yesteday and the RPM is back up to 1600-1700. Throttle is still 70% (ie should be governing). What is going on?.

I wondered if it is recalibrating the throttle range each time - but the instructions say the max throttle position is done during the setup. Also, it doesn't force any hi-throttle position before enabling the motor. If I power-up with 0% throttle, the motor is armed immediately.

Any ideas anyone?.

Thanks,

John C.
05-13-2004 Over year old.
HOMEPAGE  
 
 
rscamp
Veteran
Location: Ontario, Canada

I have two of those controllers but haven't had that problem.

A couple of suggestions though.

1. Make sure when you set it up you are using the same voltage you will be using when you fly it.

2. Reducing the head speed that much with the governor may not be a good idea. Low governor settings are hard on the controller (brushless controllers are not very efficient as you approach mid-throttle).

Rob
05-13-2004 Over year old.
HOMEPAGE  
 
 
JohnC
Veteran
Location: East Yorkshire, England

Hi Rob,

The pack was the same each time: I programmed governed mode, turned it all off, went outside and set the throttle to give 1550RPM.

The next day I spooled it up and it went to 1720RPM for the same throttle - which dropped according to the collective pitch.

You don't have to put the throttle to 100% before arming the motor do you?.

I don't like to leave this without understanding why: things usually come around and kick you in the ass.

John C.
05-13-2004 Over year old.
HOMEPAGE  
 
 
rscamp
Veteran
Location: Ontario, Canada

Sorry, John.

I can't think of anything else. No, you don't need to set throttle to full. The controller arms when it sees minimum throttle.

I assume you are pulling off the jumper after you program the controller.

Rob
05-13-2004 Over year old.
HOMEPAGE  
 
 
JohnC
Veteran
Location: East Yorkshire, England

Hi Rob,

Yes - I've removed the jumper.

I did some more tests and it seems a bit strange. I reprogrammed the controller, and flew it. It governed at 1575RPM.

I turned it all of and waited 20 minutes or so then flew again. It governed at 1595RPM. 5 more minutes 'off' then it was 1599RPM.

It is definitely governing because it keeps the speed so accurately. It is just as if the upper throttle position drifts upwards. Strangely, it always keeps the motor 'off' position accurately.

I suppose it's not a real problem running ungoverned - but now I know it isn't working properly, I want to fix it :-).

I've emailed Kontronik support - so I'll see what they say ...

Thnaks,

John C.
05-14-2004 Over year old.
HOMEPAGE  
 
 
Optech
Key Veteran
Location: Vista/Oceanside, CA.

John,
How are you doing??? Long time no e-mail

Have you tried asking this question over at RCGroups.

http://www.rcgroups.com/forums/index.php?topic=air-elec

There is an electric heli section that gets a bit more traffic as well as a Kontronik vendors forum.

Have fun,
Mike

Viva La Airtronics!
05-14-2004 Over year old.
 
 
JohnC
Veteran
Location: East Yorkshire, England

Hey Mike,

Thanks for the link, I'll check it out.

This is for the logo cameraship, which is kitted out with EVERYTHING. I've done a couple of test flights, and it's awesome.

Having some other issues with the downlink though - I might be having a chat with you about it soon ...

John.
05-14-2004 Over year old.
HOMEPAGE  
 
 
rscamp
Veteran
Location: Ontario, Canada

John.

Out of curiosity, what motor are you using in the heli?

Rob
05-14-2004 Over year old.
HOMEPAGE  
 
 
JohnC
Veteran
Location: East Yorkshire, England

Rob,

I'm using the Kontronik Tango 45-08

John C.
05-14-2004 Over year old.
HOMEPAGE  
 
 
rscamp
Veteran
Location: Ontario, Canada

That's the one I'm using, so it isn't the motor!

I was thinking it might be some type of motor interaction, but the Beat is made for the Tango...

Rob
05-14-2004 Over year old.
HOMEPAGE  
 
 
JohnC
Veteran
Location: East Yorkshire, England

Here is the reply I got from Kontronik customer service:

Quote 
it depends on the voltage of the battery and the "hyterese" of the receiver. It has nothing to do with the controller


Well, now you know.

And now you do, can you explain it to me

John C.
05-18-2004 Over year old.
HOMEPAGE  
 
 
rscamp
Veteran
Location: Ontario, Canada

Well John, that wasn't the most helpful expanation I have ever seen! I provide my two cents worth, but that's probably all it is worth...

The voltage is no surprise to either of us.

I think "hyterese" is "hysteresis". Hysteresis in this context would probably be a lag or inability for the radio or receiver to return exactly to the set throttle level each time. This makes some sense, but I think it would only explain small speed errors, not the large one you have been experiencing unless of course there is a malfunction in the TX or RX.

If there is something going on with your transmitter or receiver, I suppose you could see that by connecting your throttle channel to a servo. You could replicate the settings you make and then plug a servo into the throttle channel and take careful note of the precise angle of rotation of the servo before and after you notice a speed change.

Rob
05-18-2004 Over year old.
HOMEPAGE  
 
 
JohnC
Veteran
Location: East Yorkshire, England

Hi Rob,

I think the reply was a 'don't bother us' fob off.

I agree with your Tx/Rx statment. It all works perfectly with my other helicopters.

I actually have a flight-control system between the Rx and the throttle output - so I can see very accurately what is being received, and what is being sent out. It is all as expected. This system is quite mature now - so I'm pretty sure what it tells me is correct.

On a brighter note, the governor function seems to have settled at a shade under 1600 RPM for 70% throttle. I will stick with this until it changes again. Thinking back, the problems may have started when I ran a pack of 2400 NICADs then went back to my usual 3300 NiMh.

The main reason for sorting it out is to prevent the 1700+ RPM when it first spools up. Once it's in the air, it's pretty close to 100% power anyway.

Thanks,

John C.
05-19-2004 Over year old.
HOMEPAGE  
 
 
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e-Electric Motors & Controllers > Governor mode problem: Kontronik Beat 50-8-30
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