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APM 2.6 Wont Arm Need 3D Fix

Posted by Dale Fischer on December 5, 2014 at 7:11am

Looks like most of the posting here is quit old. But here go's.

When I try to Arm my Quad on Mission Planner, I get Check FS_THR_VALUSE

and GPS: No Fix.

Been searching for 2 days know. Can't find anything that helps.

I hope someone can help me with this arming problem.

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Replies

  • Houss Pin October 1, 2019 at 9:36pm

    Hi, Whats the difference between 3DR Iris and Iris Plus? 

    Thx

  • Ana Miarnau January 4, 2015 at 1:45pm

    Hey Dale, 

    Would you mind posting a quick note with how you managed to fix it or what was wrong that was preventing the GPS from locking?

    Would be great for others who might have the same problem (such as myself and others who might come after) 

    Thanks. :)

    • Dale Fischer > Ana Miarnau January 5, 2015 at 5:11am

      Hey Ana Miarnau

      I'm using Turnigy 9X Tr and Tx.

      Got throttle failsafe to work with these #s Tx on 982, FS 915. Tx off 900, FS 915.

      Had to Disable Fence to get motor arm. Steel no gps lock. Can't get help on what needs to be dun on the gps

      lock. I wont fly until I get a gps lock. Some say to set the HDOP to 250 to get a gps lock.

      I don't know what the HDOP is in Mission Planer, so have not tried it. 

      Sorry I cant be more help.

      • Ana Miarnau > Dale Fischer January 7, 2015 at 10:07am

        Thank you very much, will try that then! 

  • Mike Knott December 5, 2014 at 8:15am

    Your throttle failsafe is set too high, check your RC calibration. This is a prearm check. If you're trying to take off in a GPS assisted mode, then you will need a GPS fix for takeoff. If you're taking off in stabilize or another non-GPS mode, then the GPS fix won't be relevant.

    http://copter.ardupilot.com/wiki/throttle-failsafe/

    http://copter.ardupilot.com/wiki/prearm_safety_check/

    • Dale Fischer > Mike Knott December 5, 2014 at 11:32am

      Hi Mike

      Thanks for responding.

      Mod is Stabilize.

      Tx on APM plugged in to computer. Looking at Initial Setup > failSafe. Radio 3 (THR) is 982, FS is 995

      Tx off Radio 3 is 900, FS is 995

      What do you think my settings should be if the Throttle cant go down lower then 982

      Can not get a GPS Fix. I have a QRX350 it gets GPS Fix at the same lowcation.

      Tx Throttle would not go any lower then 982. Had to increase the FS to get the minimum 10 difference.

      Have been using the Arducopter site but stell dont get it.

      I appreciate any help you can give.

      Thanks

      Dale

      • Mike Knott > Dale Fischer December 5, 2014 at 11:42am

        If you go to the links I posted in my first reply, all of your questions will be answered. That is the official wiki for ArduCopter, and that should get you on the right track.

        • Dale Fischer > Mike Knott December 5, 2014 at 12:40pm

          I have been using the ArduCoper website. Some things work for me and some just confuse me.

          Are the #'s that I posted for Radio 3 and FS good ?

          Thanks again

          Dale

          • Mike Knott > Dale Fischer December 5, 2014 at 1:09pm

            When your radio is ON, you want your minimum throttle value (Ch3) to be above the FS value. When the radio is OFF, you want the throttle (ch3) to drop below the FS value. Currently, your radio is set up so that when on, it is already below the FS value (995) compared to your minimum throttle (982). Simply set the failsafe value to ~970 and see what happens.

            • Dale Fischer > Mike Knott December 7, 2014 at 6:11am

              I finally got it to ARM.

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