DJI Wkm and Herkules III arming issues

[redridinghood]

I finally found some time to finish my 2nd Skyjib X8. For this one I am using the Herkules III boards with Wkm and Orbit 15-20 motors. I have stumbled onto an issue that won't let me power up the motors.

- DJI wkm is running 5.14. Flashed twice, both times same result. All configuration settings defaulted and reentered many times.

View attachment 7420

- Herkules III boards running latest firmware. The Herkules III boards work just fine when hooked up directly to the AR8000 throttle channel.

View attachment 7419

- + and signal servo wires are hooked up correctly.
View attachment 7418

- DJI Wkm is set up correctly in GS. TX sticks calibrated many times (Spektrum DX8, throttle end points _115% +115%), tried all flight modes with no difference, all settings of motor startup power. All CSC combinations do not start motors.

Anyone with any ideas what might preventing the Wkm of arming and spinning the motors?

 

[elossam]

Did you tested the flar wire to servo wire adapter boards. I tried to figure how they were routed and was not able to do it but I did it too fast due to the lack of time. I would check that again.

 

[redridinghood]

Yes. When I use the same servo wire exiting the wkm and plug it into RX throttle channel motors spin just fine.

 

[kloner]

when you roll the sticks, is the green sliders moving to the extreme ends of the scale in TX Cali? is d/r setup?

 

[redridinghood]

Yes, all sticks move as expected in calibration window. No dual rate used. MC is a V2 if that makes any difference.

 

[achta]

Is it possible that your controll mode switch is not in the right possition, you have to center and trimm it...

maybe than it will work...
Lg

 

[kloner]

were those pictures of wk assistant suppose to be hooked up to the model?

 

[redridinghood]

Control mode switch is set up correctly, flight modes change and turn green in the GS software. The pictures I took after I disconnected the unit.

Thanks for the help guys.

 

[DennyR]

Check that you trims are in neutral position. If pitch has positive value it wont start.

 

[redridinghood]

Thanks Denny, I checked the trims all were default and centered.

I hooked a motor output from my CX Naza with the same RX form the SJ and the herkules works just fine.

View attachment 7437

TX works ok
Herkules III work ok
Cables ok
Motors ok
GS software setup ok

Conclusion new V2 MC not ok.

 

[BorisS]

Red probably MC V2 sends out a different start PWM pulse. Ask Andreas if they tested the Herks with a V2 MC of the WKM. If not and they have he same issue than they will have to change sometime in their PWM firmware.

Boris

 

[BorisS]

I think to remember but not sure anymore if you got a ESC32 with the AQ. If you did you could find out what the difference its between the NAZA and MC V2 for example. Naza for example sends out a minimum PWM value of 900. ESC32 didn't work before they were set to that.

Boris

 

[ichwillnix]

Hi,

the PPM signal has to be shorter than 1080 microseconds to be detected as zero from the herkules.
Maybe the Wookong does deliver a signal not shorter than this. Normally this is an issue with spectrum rx. An increase of stick range to +/- 120% should solved this issue.

Could you try it with a different receiver, not spectrum. (I dont like it anyhow... ;-)
Andreas

 

[redridinghood]

Unfortunately I don't have any other TX other than Spektrum. Tried both DX8 and DX6i. I do have the range increased to -115% +115%. Tried up to 150% with no difference. Herkules boards run fine when directly connected to Spektrum RX, motors start up at around 110% range. Also Naza -Herkules works fine with the same TX-RX.

The boards do initialize at power on with the beeps and lights.

 

[redridinghood]

Whats a good radio for Herkules? Futaba 14SG or Graupner MX-20?

 

[ichwillnix]

Graupner is perfekt.
But looking at your pictures, the red wire in the ribbon cable is on one calbe right on the other cable left! Did you see this?

Please build your cables exactly like here described here:
View attachment 7439

http://www.andreasbaier.de/index.php/en/herkules-iii-generation-3/plug-connection

And try to set the "cut off typ" to "intelligent". With this it works on my side perfect with DJI wookong.

Andreas

 

[redridinghood]

The cables are fine. I have tested them.

I have connected the outputs of the V2 MC onto DJI's esc and still no throttle response. The V2 MC replacement I received is faulty.

Any dealers in Europe that can assist with a replacement?

 

[BorisS]

Red I can send you a fresh replacement MC which I am not using at the moment. Can send it away earliest on Monday !

Boris

 

[redridinghood]

Red I can send you a fresh replacement MC which I am not using at the moment. Can send it away earliest on Monday !

Boris

Wow Boris that is very nice of you. Is it a V2? I will take you up on your offer if you allow me to pay shipping both ways + a beer for you ;-)

Thank you.

 

[elossam]

Every time you modified the thr endpoint did you recalibrate the sticks in the wkm software? I would try both: not calibrate and calibrate. Maybe if you calibrate it the wkm restores the output signal to the same level no matter which value comes in. If thats right then you may calibrate it at 100%, then lower the epa up to 130 or more and may be lower the thr trim. Just an option.