Failsafe ?

[Neddy]

I am loading a new plane into my radio master tx12 but having problems with failsafe setting on frskyv8 receiver. I  bind the receiver but find the throttle setting needs calibrating. To calibrate you turn off the receiver put your throttle at full setting on radio then turn on the receiver wait for two beeps and turn down throttle to minimum position after hearing three beeps the throttle is calibrated. But doing this triggers the failsafe. If I turn radio to disarm the motor it starts running flat out. I am thinking the receiver is faulty? Any suggestions

[Neddy]

I have done as this video suggests but doesn't work I have the same receiver. 

 

 

 

[Neddy]

This is how I calibrated the esc

 

 

 

[RottenRow]

Are you sure that you set the failsafe correctly? The video in your second post is exactly correct.

 

In your case it sounds like you have set the failsafe with the throttle stick in the up position. Try doing it again.

 

Brian.

[GrumpyGnome]

@Neddy are you sure it is going into failsafe - there is no reason for that to happen...

 

[John Wagg]

Start again - 

Rebind the receiver. This will cancel any failsafe that has been set.

Set the the Tx sticks to the failsafe position (Usually throttle low/off.)

Press the failsafe button on the Rx for less than 1 second and the green light should flash.

Test to see if it works.

 

NB. To calibrate the ESC you do not need to turn the receiver off. Yes it will be off because the battery to the ESC will not be connected.

Disconnect the ESC, move the TX stick to the high. Connect the ESC and it will beep. Move stick to low position and ESC will beep. That should be it.

 

Edited July 22 by John Wagg

[Neddy]

I thought it could be something I had set up wrong in the radio but I have the same settings in another plane and have had no problems. I have the arm and disarm set the same. Both planes have the same model receivers. In the plane in question the motor operates normally with radio in armed position. Once I turn it to disarm the motor runs flat out. This tells me it's the failsafe that is doing this. I have tried to reset the failsafe as instructed in the video by  rebinding  disconnecting reconnecting and a quick press of the button on the receiver but its not working.

[John Wagg]

Are you getting the flashing of the green LED after setting the failsafe ?

 

This same thing happened to me a couple of days ago.

Switching the kill switch set the motor going. -  I hadn't ticked one of the boxes to "enable" the setting in the "special functions".

Double check that everything is set exactly the same on both planes.

 

Edited July 22 by John Wagg

[RottenRow]

1 hour ago, Neddy said:

Once I turn it to disarm the motor runs flat out. This tells me it's the failsafe that is doing this.

Er no it doesn’t. The failsafe only comes into play when the receiver loses all signal from the transmitter. It’s got nothing to do with you operating your disarm switch.

 

It sounds as if you have the transmitter setting wrong for your disarm switch and it is giving the opposite command to that required.

 

Is there something in the tx programming that reverses the operation of the disarm switch?

 

Brian.

[Neddy]

I have just checked my special functions settings yes I had not ticked the switch boxes on the plane that was in question. I had ticked them on the plane that was operating properly. Thank you for your help much appreciated!

[Neddy]

I thought it could be something I had set up wrong in the radio but I have the same settings in another plane and have had no problems. I have the arm and disarm set the same. Both planes have the same model receivers. In the plane in question the motor operates normally with radio in armed position. Once I turn it to disarm the motor runs flat out. This tells me it's the failsafe that is doing this. I have tried to reset the failsafe as instructed in the video by  rebinding  disconnecting reconnecting and a quick press of the button on the receiver but its not working.

[Neddy]

I thought I had it solved when I found I hadn't ticked the sections in special functions but it didnt work. I still have the problem when I turn on disarm with motor running flat out ! There must be a problem in the set up on radio somewhere ? 

[Phil Green]

Failsafe and ESC throttle calibration are two entirely separate things, so separate them and do one at a time.

Unplug your ESC and plug in a spare servo into the throttle channel.

Switch on your Tx

Get a NiMh pack and plug it into a spare Rx channel.

Wait for the Rx to link and check the servos move.

Shut the throttle stick and note which end the servo goes to

Briefly dab the Rx button and observe the green flash.

Thats it, your failsafe is set.

Test it by switching off the Tx and watching the throttle servo go the the position you noted above.

Now,

Remove the battery from the Rx, remove the prop and unplug the throttle servo. Plug your ESC into your Rx throttle channel.

Plug in a Lipo and wait for the Rx to link. Check the servos wiggle. Check the throttle operation. Does the ESC need calibrating?

If so unplug the lipo, set the Tx to full throttle, plug the Lipo back in.

Wait for the beeps and immediately shut the throttle, and expect 3 beeps (if a 3 cell Lipo)

Thats the ESC calibrated,

If your 'disarm' function now gives full throttle, then its a Tx programming problem, nothing whatever to do with ESC calibration or Failsafe 🙂

 

Unless its an old ESC I would be surprised if it ever needed calibrating, most modern ones use continuous training - they remember the lowest and highest throttle channel signal they've ever seen.   Hope this helps!  😉

 

Cheers

Phil

Edited July 23 by Phil Green

[GrumpyGnome]

Neddy, failsafe is the term we use for when the receiver is no longer in communication with the transmitter I.e. you have no control.  It's designed to try and minimise the potential damage to people, property and models.  Examples are: flying out of range, radio interference or radio failure, switching your transmitter off before the receiver. 

 

Unless you are deliberately turning your transmitter off before your model, it is not going into failsafe. Phil's advice re failsafe above is spot on.

 

If your special function is supposed to override the throttle channel, and set it to idle, it should have a value of -100.  If you are using the correct channel, and it is activated when you select the function, but it activates full throttle, it is possible you have reversed the throttle output. When you activate this special function (to arm in your terminology) move the throttle control (stick) to see what happens - this will tell you if your throttle is reversed. This is perfectly safe as your model should have no propeller attached.

 

[Learner]

As above, are you getting failsafe confused with throttle cut.

If its throttle cut your after can't you just change the switch to the other way round, I don't use radiomaster so can't help but it's easy on spektrum.

Edited July 23 by Learner

[Neddy]

I am convinced it is the radio.The instruction manual isn't much good it just adds to the confusion. One plane works ok so I duplicated the settings on the other plane and this has the problem with the disarming running flat out. With the throttle not working. When I arm it the throttle works as normal. 

[GrumpyGnome]

It seems highly unlikely that a special function works perfectly in one model but not another. Do you have a clubmate who can give you 'hands on' help? If not, can you post a screenshot of the Special Function you are using as arm/disarm? Have you tried changing the override value? 

 

The radio manual can never be a comprehensive 'how to' as the operating system is in constant development - quite deliberately.  It will be running either EdgeTX or OpenTX depending on its age. When you turn it on, it will tell you, unless you have modified the Welcome screen and message. Written documentation covering the basics can be found  here http:// https://manual.edgetx.org/   (I am assuming the radio has EdgeTX .......). There are also many YT videos - lots will be for OpenTX but as EdgeTX grew out of OpenTX, most stuff will still be relevant.

 

[Neddy]

I have at last sorted it out there was a missed step in the mixes section. The radio has edgeTx  I have watched a large number of videos on setting up the boxer,Zorro. Tx16 with edge tx.  Thanks every body for your help