P70 Failsafe problem
03-18-2008, 08:45 PM
#1
P70 Failsafe problem
Hi all,
I am setting up my first jet. It has a P70 with version 6.0 software. My Tx is a JR XP9303 with a Spektrum 9 channel module and and the Rx is a Spektrum AR9000 (red plastic). It has been properly binded with the throttle down and trip down and ATV's at 150%. Then I "learned RC" with the ATV's set at 70%. But, when I turn off the Tx, I do not get a failsafe on the GSU.
If I turn on the Rx without the Tx on, the GSU shows a failsafe. Then, if I switch on the Tx, the failsafe goes off. If I then switch the Tx off again, it does not show a failsafe.
I have tried rebinding, both with Smart Safe method and with the Pre Set Failsafe method. No luck either way.
Would appreciate any and all help.
I am setting up my first jet. It has a P70 with version 6.0 software. My Tx is a JR XP9303 with a Spektrum 9 channel module and and the Rx is a Spektrum AR9000 (red plastic). It has been properly binded with the throttle down and trip down and ATV's at 150%. Then I "learned RC" with the ATV's set at 70%. But, when I turn off the Tx, I do not get a failsafe on the GSU.
If I turn on the Rx without the Tx on, the GSU shows a failsafe. Then, if I switch on the Tx, the failsafe goes off. If I then switch the Tx off again, it does not show a failsafe.
I have tried rebinding, both with Smart Safe method and with the Pre Set Failsafe method. No luck either way.
Would appreciate any and all help.
03-19-2008, 07:00 AM
#3
RE: P70 Failsafe problem
Hi KC,
I tried that this morning. No change. The only thing that happens when I turn off the Tx is tthat I get a message on the GSU saying "RC OFF".
Everything else seems to work properly except for the failsafe. I am guessing that it has something to do with the Sprektrum Module but I am not sure.
I tried that this morning. No change. The only thing that happens when I turn off the Tx is tthat I get a message on the GSU saying "RC OFF".
Everything else seems to work properly except for the failsafe. I am guessing that it has something to do with the Sprektrum Module but I am not sure.
03-19-2008, 07:06 AM
#4
RE: P70 Failsafe problem
you've got the Throttle and the Aux channels reversed it sounds like or the failsafe set to the Aux not the throttle.
EDIT: when you are doing the Learn RC, watch the values for the radios pulse width, make sure when you move the throttle they move accordingly. you can even watch the value and flip the TX off and see if the pulse goes to failsafe just make sure you have them in the proper setting before you press select.
EDIT: when you are doing the Learn RC, watch the values for the radios pulse width, make sure when you move the throttle they move accordingly. you can even watch the value and flip the TX off and see if the pulse goes to failsafe just make sure you have them in the proper setting before you press select.
03-19-2008, 08:23 AM
#6
RE: P70 Failsafe problem
Oh yes, one more tidbit. If the Tx and Rx are off and I turn on only the Rx, it starts off showing a failsafe condition. If I then turn on the Tx, the failsafe goes off. When I turn off the Tx, it does not show a failsafe.
Hmm.
Hmm.
03-19-2008, 09:59 AM
#9
RE: P70 Failsafe problem
ORIGINAL: racer8297
Hi KC,
I tried that this morning. No change. The only thing that happens when I turn off the Tx is tthat I get a message on the GSU saying "RC OFF".
Everything else seems to work properly except for the failsafe. I am guessing that it has something to do with the Sprektrum Module but I am not sure.
Hi KC,
I tried that this morning. No change. The only thing that happens when I turn off the Tx is tthat I get a message on the GSU saying "RC OFF".
Everything else seems to work properly except for the failsafe. I am guessing that it has something to do with the Sprektrum Module but I am not sure.
"RC Off" just indicates the manner in which the turbine was last shut down. Go to the "RC Check" menu and see what your pulse widths are at low throttle, and then shut the TX off and see what the pulse width changes to then. Let me know or you can call me at (805) 907-4462.
I am not familiar with these spektrums but most radios behave in a similar way. Like you said the module system might be different as it is PPM and it must set the failsafe through a button or something on the RX.
Regards,
03-19-2008, 03:23 PM
#11
RE: P70 Failsafe problem
ORIGINAL: racer8297
How do I un-swap them?
How do I un-swap them?
just make sure the throttle channel from the ECU is plugged into the throttle channel on the RX and the Aux is equally plugged into the Aux channel.
03-20-2008, 08:05 AM
#12
RE: P70 Failsafe problem
Ok, problem solved. Thank you to everyone for the help! And a special thank you to Matt how allowed me to call and work through the issue. With Matt's quick class on servo pulses and the ECU software I was able to figure this out.
To refresh everyone, I have a JR XP9303 (originally a 72mhz radio). I installed a Spektrum Module that came with a Spektrum AR9000 Rx. What was happening was that I could not get a "failsafe" condition. What was happening was that the lowest throttle pulse was 949. It turns out that even binding at plus and minus 150 on ATV and then going as far as plus and minus 50 and "learning RC" the failsafe on the Spektrum Rx was still 949.
So, I re-binded the system at 150, using "Pre-set Failsafe" instead of Smartsafe. Watching the throttle pulse I lowered the ATV to 40% and noticed that at low throttle, low trim, the value was 949. As I raised the ATV to 47% the throttle pulse then started to increase.
Bottom line is that you bind at 150%. Use the Pre-set Failsafe method (bind plug in the whole time instead of removing it before hitting the bind button). Reduce ATV's to plus and minus 40%. Then, learn RC. Should be good to go!
Thanks again to everyone and thank you Matt for allowing me to call you and take up your time! It was most educational!
Jim
To refresh everyone, I have a JR XP9303 (originally a 72mhz radio). I installed a Spektrum Module that came with a Spektrum AR9000 Rx. What was happening was that I could not get a "failsafe" condition. What was happening was that the lowest throttle pulse was 949. It turns out that even binding at plus and minus 150 on ATV and then going as far as plus and minus 50 and "learning RC" the failsafe on the Spektrum Rx was still 949.
So, I re-binded the system at 150, using "Pre-set Failsafe" instead of Smartsafe. Watching the throttle pulse I lowered the ATV to 40% and noticed that at low throttle, low trim, the value was 949. As I raised the ATV to 47% the throttle pulse then started to increase.
Bottom line is that you bind at 150%. Use the Pre-set Failsafe method (bind plug in the whole time instead of removing it before hitting the bind button). Reduce ATV's to plus and minus 40%. Then, learn RC. Should be good to go!
Thanks again to everyone and thank you Matt for allowing me to call you and take up your time! It was most educational!
Jim
03-20-2008, 12:32 PM
#13
RE: P70 Failsafe problem
Just a comment. I use Smart Safe on the XP9303 & Spectrum AR9000. I bind at throttle = H100 & L150. After that, I reset my End Points to H100 & L100. I also set my trim range = 40% on throttle (as I always have, even on 72). Throttle down, trim down pulse = 1140 and trim max pulse = 1220. Failsafe pulse = 950. This works and I know for sure since I've had 2 (two) Fail Safe shutdowns inflight (out of 400+ flights).
Probably the pulse has to be out of range by a certain amount to cause the failsafe. Even JetCat recommends a reduced throttle range so there must be an issue out there somewhere to make Spectrum operate/failsafe reliably with the ECU, although I wouldn't know why. Maybe it's the reduced trim range I use that makes it work ok for me.
Probably the pulse has to be out of range by a certain amount to cause the failsafe. Even JetCat recommends a reduced throttle range so there must be an issue out there somewhere to make Spectrum operate/failsafe reliably with the ECU, although I wouldn't know why. Maybe it's the reduced trim range I use that makes it work ok for me.
